POLYGON - Program Listing by - USGS · 2010. 12. 8. · USGS-OFR-85-233-B USGS-OFR-85-233-B UNITED...

USGS-OFR-85-233-B USGS-OFR-85-233-B

UNITED STATES DEPARTMENT OF THE INTERIOR

GEOLOGICAL SURVEY

POLYGON - Program Listing

by

Bruce A. Chuchel U.S. Geological Survey Menlo Park/ CA/ 94025

Open File Report 85-233-B

Prepared in cooperation with theNevada Operations Office

U. S. Department of Energy(Interagency Agreement DE-AI08-78ET44802)

This report is preliminary and has not been reviewed forconformity with U.S. Geological Survey editorial standards.

Use of brand names in this report is for the sake of descriptiononly, and does not constitute endorsement by the U. S.

Geological Survey. Although this program has been tested/the U.S. Geological Survey makes no guarantee of correct results.

Menlo Park/ California

1985

USGS-OFR-85-233-B USGS-OFR-85-233-B

UNITED STATESDEPARTMENT of INTERIOR

GEOLOGICAL SURVEY

POLYGON - Program Listing

BY

B. A. CHUCHEL 1

U.S. Geological Survey/ Menlo Park/ CA

INTRODUCTION

This report contains a listing of the FORTRAN program POLYGON. The Open- File Report #85-233-A [Chuchel, 1985] describes in detail how to use the POLYGON program. POLYGON features color-graphics, an interactive user dialogue, brief help messages, and "zooming" to selected portions of the terminal screen in order to edit and manipulate polygons using a graphics cursor or the Envision mouse. POLYGON has been developed in support of the U. S. Geological Survey's effort to characterize potential radioactive waste storage sites at the Nevada Test Site for the Nevada Waste Storage Investigations project.

POLYGON is a computer program for developing polygonal models on an Envision color-graphics terminal. The term "polygonal model" means (1) the coordinates of the corners of a set of polygonal shapes, (2) a set of parameters and parameter descriptions attached to each polygon, and (3) the topologic structure that links the polygons in a storage hierarchy. POLYGON uses a data structure called a quadruply linked tree [Knuth, 1969, p. 352] to store the topology of the collection of polygons composing the model.

These polygonal shapes may subsequently be used by independent modeling programs to represent three-dimensional shapes of gravitational or magnetic sources; for example, output from POLYGON is directly compatible with programs MAGPOLY or GRAVPOLY [Plouff, 1975a, 1975b; Godson 1983a, 1983b] and PFGRAV3D or PFMAG3D [Blakely, 1981].

A model may consist of up to 100 polygons; each with up to 100 vertices. Each polygon may be assigned up to ten numerical parameters, each with a descriptive label. A polygon's sides may not be self-crossing; perimeters of polygons are not allowed to cross, but any number of polygons can be completely contained within other polygons.

POLYGON is written in DEC (Digital Equipment Corporation) extended FORTRAN 77 and is presently operational on the USGS, Branch of Geophysics, VAX/VMS computer. The program is written to operate on the Envision 200 series of color-graphics terminals by Envision Technology Incorporated. The 200 series features a Tektronix 4014 compatible instruction set [Envision, 1983]. Modular construction of the program should make it relatively simple to convert to other color-graphics terminals.

REFERENCES

Blakely, R. J., 1981, A program for computing the magnetic anomaly overdigital topography: U.S. Geological Survey Open-File Report 81-298, 46 p.

Chuchel, B. A. , 1985, POLYGON - An interactive program for constructing and editing the geometries of polygons using a color graphics terminal: U.S. Geological Survey Open-File Report 85-233-A, 38 p.

Envision Technology, INC., 1983, Models 220 and 230 color graphics terminals reference manual #20640-1: San Jose, CA, 178 p.

Godson, R. H. , 1983a, MAGPOLY: A modification of DONALD PLOUFF's 3-D magnetic modelling program: U.S. Geological Survey Open-File Report 83-345, 48p.

Godson, R. H. , 1983b, GRAVPOLY: A modification of DONALD PLOUFF'S 3-D gravity modelling program: U.S. Geological Survey Open-File Report 83-346, 53p.

Knuth, D. E., 1969, The art of computer programming, Volume 1/Fundamental Algorithms: Menlo Park, CA, Addison-Wesley, 634p.

Plouff, Donald, 1975a, Derivation of formulas and FORTRAN programs to compute magnetic anomalies of prisms: U.S. Geological Survey Report, 112 p., available from National Technical Information Service, No. PB-243-525, U.S. Department of Commerce, Springfield, VA, 22161.

Plouff, Donald, 1975b, Derivation of formulas and FORTRAN programs to compute gravity anomalies of prisms: U.S. Geological Survey Report, 90 p., available from National Technical Information Service, No. PB-243-526, U.S. Department of Commerce, Springfield, VA 22161.

c+ccccccccccccccccccccc-c

Program POLYGON

Is designed to facilitate the construction

and editing of

th« geometries of

polygons Interactively

on an Envision color graphics terminal.

Various output files may be generated; for example, output

files compatible with the programs GRAVPOLY [Godson, 1983b]

and MAGPOLY [Godson, 1983a] may be created.

A standard

grid file may also be created which Is

compatible with the

programs PFGRAV3D and PFMAG3D [Blakely, 1981].

POLYGON can

take Input from the Envision mouse or

the cursor

control keys on

the numeric keypad.

For detailed Information

about using the program see the USGS Open-File report *85-Zrfc?r

"POLYGON -

An Interactive Program For

Constructing and Edit

ing the Geometries of

Polygons Using A Color Graphics Terminal

Author: Bruce A.

Chuchel ,

USGS, Menlo Park, CA.,

94025

Version 0.5

2/21/84

Version 1.0

12/09/84

CharacterMS label

Common /topology/ 1nfo( 100) , 1 u

pper ( 100) , 1down( 100) ,

AlleftC 100) , 1r1ght( 100)

Common /newtopo/ Inf new( 100) , 1upnew( 100) , 1dwnew( 100) ,

AllfnewC 100), Irtnewl 100)

Common /screenloc/ntotal ,numply( 100) ,xscr( 100, 100) ,yscr ( 100, 100)

Common /subscreen/xscrn( 2 ) , y

scrn(2),xgrd(2) ,ygrd< 2)

Common /box/xm1nbx( 100) , x

maxbx( 100) , y

mlnbx ( 100) ,ymaxbx( 100)

Common /1nout/x1n( 100, 100) , y 1 n( 100, 100) , xoutl 100, 100) ,

&yout(100, 100)

Common /parameter /parm( 100, 10)

/label s/ label/ Junk /ngb t

op , J

nktopC 100) , n

gbloc , J

nkloc( 100)

/gr 1d/grd( 250000)

/grid specs/ Id ,pgm, n

c,nr,nz,xo,dx,yo,dy,1proj,cm,bl

/scale/xsc,ysc,xstart,ystart,x1n1t,y1n1t

/subgrld/lcmln, Icmax, Irmln, 1

rmax,ncm1n,ncmax,nrm1n,nrmax

/scalefacts/ 1wc0, J

wc0,nxp 1 x , nyp 1 x ,p 1 xd 1m

/cal c/ncont , cml n , cdel

/screenbnd/x Ieft,xr1ght,ybot, ytop

/ names /grdnam,modnam , m

odgrd

/zoom/ Izoom, 1 zval ,

nzoom,ncm1nz( 5 ) , n

cmaxz (5),nrm1nz(5),

&nrmaxz(5)

Common

/ command s / n

ma x ,eps 1 1n, del In, del o

ut

/max/nptmax

/mlsc/ncol ,nrow,f Irst ,ntop, If Irst

/f lags/mcf lag , v

otf Ig

/model /mdfl jg/or Ig Inal / I

wcorg , J

wcorg ,nxorgp, n

yorgp

/colors /plyc 1 r ,black ,wh Ite

/f 1 1 1 /open , sol Id, f 1 1 typ

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Common

Character open*! , sol 1d*l ,f 1 I

typM ,pl ycl r*l ,

black*l ,wh1te*l

Character ans*l ,mcflag*2,f1rst*l , c

olor*!

Character vot fig*-, type*! , t

erm* 1 , 1d*56 ,

pgm*8

Character quest* 80, com* 2 ,

grdnam*80,modnam*80, modgrd* 80

- Print welcoming banner.....

4Call

wrtmsgC'**

Cal1 wrtmsg('

Welcome to

POLYGON version 1.0...12/09/84')

Cal1 wrtmsg( "

CC -

Get grid (grd).

CCall grdlndtest)

If (1test.EQ.-l)Go To 100

ncol»nc

nrow»nr

CC - Ask user If

verbose or

terse questioning Is

desired.

CCall askvotCvotfIg)

If (votfIg.EQ.'Q*>Go To 100

C *

C -

Initialize values used In

scaling and drawing grid on

C terminal

CCall Initial

CC - Scale grid to

screen.

CCall scaleg2sc(0)

xsc*f1oat(nxp1x)

ysc*float(nyp1x)

Iwcorg*1wc0

Jwco

rg»Jw

cJ0fnxorgp*nxp1x

nyorgp«nyp1x

Call setbnd

Call setf11(sol Id)

Cal1 clrply

CC - Ask for polygon command

CIf 1

rst»l

com* *h*

1test-0

Do 10

whlleC1test.EQ.0)

quest*8' Polygon command (p/o/r/w/z/h/q) *

1val*1aquest(quest,com,*(aZ)',2)

ff (com.EQ. *P» .

OR.com.EQ. 'pM Then

Call pdcom<1test2)

Else If

(com.EQ.'0'.OR.com.EQ.'o'> Then

If (mdflag.EQ.1) Then

Call outcom(ItestZ)

ElseCal1 errmod

End If

Else If

(com.EQ.*R*.OR.com.EQ.'r') Then

Call mod1n(1test2)

If (IfIrst.EQ.0.AND.ItestZ.EQ.1) Then

Call setclr(plyclr)

Call setf11(open)

Call drawwa1k

Call setfll(solld)

End If

If (ItestZ.EQ.1>mdflag-l

Else If

(com.EQ.'W.OR.com.EQ.'w') Then

Cal1 modout(ItestZ)

Else If

(com.EQ.'Z'.OR.com.EQ.'z'> Then

Call zomcom(IfIrst,ItestZ)

C else If

(com.eq.'S') then

C call comcom(ItestZ)

Else If

(com.EQ.'H'.OR.com.EQ.'h') Then

Cal1 hlpcom

Else If

(com.EO.'0'.OR.com.EQ.'q'.OR.Ival.EQ.-l) Then

Cal1 askend(ans)

If (ans.EO.'Y'.OR.ans.EQ.'y') Then

Call modout<ItestZ)

End If

ttest=l ElseCal1

errmsg

com= *h * End

IfIf

(com.NE.*h»)com='p*

10 End

Do C

100 Continue

Call closup

Stop * End

of Polygon'

End*********************************************************************

addply - Subroutine called

by plycom that

allows the

user to

enter a

new polygon and

positions this

polygon 1n

the

topology array.

********************************************************************

Subroutine addp1y(Itest)

Dimension xpoly(100),ypoly(100),xloc(100),yloc(100)

Common /box/xmtnbx(100),xmaxbx(100),ym1nbx(100),ymaxbxl100)

Common /commands/nmax,eps1In,del In,delout

Common /ca1c/ncont,cmln,cdel

Common /mlsc/ncol,nrow,f1rst,ntop, If Irst

Common /screenloc/ntota1,numply(100),xscr(100,100),yscr(100,100)

Common /temp/ntemp,xtemp(100),ytemp(100)

Common /flags/mcflag

Common /zoom/1 z

oom,1zva1,nzoom,ncm1nz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)

Common /colors/plyeIr,black,whIte

Common /f111/open,sol Id,f1Ityp

Character Intype*!,ans*2,ans2*2,mcflag*2,f1rst*l

Character open*!,sol1d*l,f1ltyp*l,p1ydr*l,black*!,wh1te*l

CItestM

Call setclr(plyclr)

lntype='0'Call

setl1n(Intype)

CC -

Ask If

user needs

help C

If (first.EG.'y') Then

Call hlpaddtItest)

End If

CC -

Find the

top (root)

node of

tree

CIf

(ntotal.GT.0) Then

Call fndtop(ntop)

If (ntop.LE.0)

Then 1test=-l Go

To 100

End If

End If

CC -

Set scaling variables for

drawing on

terminal (scalen)

CCal1

scalen

cC -

Find the

next available polygon npoly.

If one

exists. C

20 Continue

ans«'U'Call

fndnum(npoly)

If (npoly.LE.0)

Then If

(npoly.EQ.0) Then

Call wrtmsgC'

*** Polygon list

full ***'}

1test«0 ElseCall

wrtmsgC' Error

In fndnum routine')

1test=-l End

If Go To

100 End

If CC

- Print message about

entry Into

Polygon drawing mode

CCall

enhmsgC'*** Add

polygon mode

****) CC

- Initialize the

temporary array.

CCall

Inttmp 30

Continue

CC - Allow user

to enter

and draw the

polygon on

the terminal,

C find

the set

of x,y

points that

define the

polygon. C

Cal1 getply(xloc,yloc,nbrpts,mcflag,Itest)

If (mcflag.EQ.'Q')Go To

100 If

(Itest.LE.0) Then

Cal1 askstolans)

If (nbrpts.GE.2)

Then Call

setclr(black)

Call drwpln(xloc,yloc,nbrpts)

Call setclr(plyclr>

End If

Elseans='U* End

IfIf

(ans.EQ.'Y')Go To

30 If

(ans.EQ.'N'>Go To

100 CC

- Test polygon for

being self-reentrant.

CCal1

selftest(Iflag,nsIdel, ns1de2,xloc,yloc,nbrpts)

If (If1ag.LT.0) Then

Call wrtmsg<'

Error, polygon Is

self-cross 1ng...try

again.') Call

setclrtblack)

Call self 11(open)

Call drwply(xloc,yloc,nbrpts)

Call setclrtplyclr)

Call self I

Ksol Id)

Go To

30 End

If C

Cal1 Inttmp

ntemp=nbrpts

If (Izoom.EQ.1) Then

Do 50 1=1,nbrpts

Cal1 Inversf xt,yt,xloc(1),ylocM))

xpolyt1)=xt

ypoly(1)=yt

xtemp(1)*xt

ytemp(1)=yt

50

Continue

ElseDo

60 11*1,nbrpts

xpoly(11)-xloc(11)

ypoly(11)-y1oc(11)

xtemp(11)-xloc( 11)

ytemp(11)«yloc(11)

60

Continue

End If

Determine If

the polygon npoly crosses another polygon, and

If It

does not, place It

1n the tree (topology).

Call fndtpl(npoly,ntop,Itest)

If (Itest.EQ.l) Then

ntota1*ntota1+1

Cal1 stoply(xpoly,ypoly,nbrpts,npoly,Itest)

Ca11 fndbbxlxm1n,xmax,ym1n,ymax,xpoly,ypoly,nbrpts,delout)

xm1nbx(npoly)=xmin

xmaxbx(npoly)=xmax

ymlnbx(npoly)=ym1n

ymaxbx(npoly)=ymax

Cal

fndbpl(npoly,Itest)

Cal newold

ElseCalCalCalCal 1Cal 1

Call

End If

If (Itest.EQ.-l)Go To 100

setclr(black)

setf11(open)

drwply(xloc,yloc,nbrpts)

setclr(plyclr)

setf11(sol Id)

oldnew

- Test ntotal here, make sure It

doesn't go over.

f1rst='n'

- Find the root node (ntop) of

the tree

Call fndtop(ntop)

- Ask If

another polygon will be drawn on this grid

Call askply(ansZ)

If (ansZ.EQ.'Y')Go Tc 20

If (ansZ.EQ.*N«)1test=l

If (ansZ.EQ.'Q')1test=-2

100 Continue

f1rst='n'

Return

End

C +CCCC-C

addpnt - Allows the adding of

a string of points Into a

polygon

between positions ncorn,ncornZ.

**************

Subroutine addpnt(Itest)

Dimension x11ne(100),y11ne(100)

Common /topology/Info(100),1 upper(100),1down(100)

8

illeft(100),tr1ght(100)

Common /screenloc/ntotal,numply(100),xscr{100,100),yscr(100,100)

Common /parameter /parml100,10)

Common /polyloc/nptloc,xlocl100),yloc(100)


Common /commands/nmax,eps11n,delIn,del out

Common /max/npti..ax

Common /flags/mcflag,votfIg

Common /junk/ngbtop,jnktopl100).ngbloc,Jnkloc(100)

Common /zoom/1 z

oom,1zva1,nzoom,ncm1nz(5),ncmaxz(5),nrm1nz(5)»

&nrmaxz(5)

Common /screenbnd/xleft,xr1ght,ybot,ytop

Common /colors/plyclr,black,white

Common /f111/open,sol1d,f1Ityp

Character open*!,sol1d*l,f1ltyp*l,plyc1r*l,black*l,wh1te*l

Character votflg*2,Intype*!,mcflag*2,mcur*2,ans*2,ans2*2

CCall

enhmsg('*** Add

point mode ***')

C1test»0If

(ntotal.GT.0) Then

CC -

If cursor

type has

not been

selected prompt for

type. C

If (mcflag.EG.'N*) Then

Call askmocdncur )

If (incur .EG. 'Q' )

Then

1test=-l

Elsemcflag=mcur

End If

Elseincur "smcf 1 a

g

End If

CC - Print help

message. C

If (votfIg.EQ.'V)Call hlpapt

CC - Start looping

until polygon 1s

found (1test=l),

or user

C wants to

quit (1test=-l).

CDo 10

wh11e(ltest.EQ.0)

If lag»0

If 1ag2=0

If <mcur.EQ.*M'.OR.incur.EQ.'C* )

Then

CC -

Initialize the

temp array.

CCal1

Inttmp CC

- Let

user pick

the polygon and

return npoly,ncorn,x,y.

CCall

pckply(npoly,ncorn,x,y,ans,mcur,1err)

CC - Ask

1f corner

point of

polygon picked Is

to be

used. C

If (ans.EQ.'Y') Then

CC - Get corner to start adding string x!1ne,y!1ne at.

CCa11 msgspt

Cal1 retpnt(xtest,ytest,meur,1err2)

If (1err2.LE.-l) Then

1test«-l

Go To 20

End If

CIf

(Izoom.EQ.1)Cal1 1nvers(xtest,ytest,xtest,ytest)

CC -

Pick side where points to be added.

CCal1

msgsp2

Cal1 fnds1d(ncorn,ncorn2,dmln,xtest,ytest,npoly,1err3)

If ( 1err3.LE.JEf>

Then

1test=-l

Go To 20

End If

CC - Undraw the connecting lines between ncorn,ncornZ.

Cxl«xscr(npoly,ncorn)

yl-yscr(npoly,ncorn)

x2!»xscr(npoly.ncornZ)

y2=yscr(npoly,ncorn2)

CIf

(Izoom.EQ.1) Then

Call transCxone,yone,xl,yl)

Call trans(xtwo.ytwo,x2,y2)

Elsexone*xl

yone-yl

xtwo=x2

ytwo*y2

End If

CCall setclr(black)

Call drwl1n(xone,yone,xtwo,ytwo>

Call setclr(white)

CC -

Now pick which corner of

the side where additions start.

CCall

retpnt( xt,yt,incur , 1test)

If (1test.LE.-l>Go To 20

If (Izoom.EQ.1>Cal1 1nvers(xt,yt,xt,yt)

CC -

Determine orientation of

line by finding closest point to xt

tyt. C

d1stl-(xt-xl)**2+(yt-yl)**2

d1st2-(xt-x2)**2+(yt-y2)**2

If (dlstl.LT.d1st2.AND.d1stl.LT.del1n**2) Then

xf Irst-xl yf1rst«yl

xend»x2

yend-y2

1set-lElse If

(d1st2.LT.dlstl.AND.d1st2.LT.del1n**2) Then

xf 1rst*x2

yf1rst=y2

xend=x1

yend=yl

1Else 1

End If

If ( 1

set.EQ.-l )Go

To 20

C - Translate the coordinates xf1rst,yfIrst,xend,yend Into

zoomed

C coordinates If

1zoom«l

CIf

(Izoom.EQ.l )

Then

Call trans(xf1rst,yf1rst,xf1rst,yfIrst)

Call trans(xend,yend,xend,yend)

End If

CC -

User enters string of points (xl1ne,ylIne) to be added.

Cnbrpts«nuR.p1y{ n

poly)

nl1ne*0

1draw»0

lntype-'0*

Call set!In(lntype)

Cal1 getl1n(xl1ne,y11ne,n11ne,xf1rst,yf1rst,xend,yend,

& 1draw,nbrpts,nptmax,mcflag,1 test)

If (1test.LE.-l) Then

IfIag2«l

Go To 20

End If

CC - Convert line to unzoomed screen coordinate If

1zoom*l.

CIf

(Izoom.EQ.l) Then

Do 50

kk=l,nl1ne

Cal1 1nvers(xl1ne(kk),yl1ne(kk),xl1ne(kk),

&

yllne(kk))

50

Continue

End If

1strg=nbrpts-ncorn

CC - Construct the xtemp,ytemp arrays.

CDo 60 J«l,ncorn

xtemp{J)=xscr(npoly,J)

ytemp(J)=yscr(npoly,J)

60

Continue

CC -

Now bring xlIne,yline Into

xtemp,ytemp

CIf

(Iset.EQ.l) Then

ncon=0

1par=1 Elsencon«n11ne+1

1par=-l

End If

CDo

70 JJ«1,nlIne

xt0mp(ncorn +JJ)=xl1ne( neon*1par*JJ)

ytemp(ncorn*JJ>=yl1ne(ncon+1par*JJ)

70

Continue

CC -

Now add the points In

xscr,yscr from ncornZ to nbrpts onto

C xtemp,ytemp at

position ncorn+n11ne+1.

CIf

(1strg.GT.0) Then

Do 80 k=l,Istrg

xtemp(ncorn+nl1ne+k)=xscr(npo1y,ncorn+k)

ytemp(ncorn+nl1ne+k)*yscr(npoly,ncorn+k)

80

Continue

, .

. End If

If

ntemp=nbrpts+n1Ine

C

C - Test the new polygon for

self-crossing.

CCal 1

self test ( If Iag3 , n

sldel ,ns1de2 , x t

emp ,y t

emp , n t

emp)

If (If 1

ag3.EQ.-l) Then

Call wrtmsg( '

Error, polygon In

self -cross 1 ng ')

If 1ag2-l

Go To 20

End If

CC - Test the new polygon In

the xtemp.ytemp array and fit

C Into

the topology structure.

CCall

testopo( npoly , 1

test2 )

If ( 1

test2.GE.0)Then

1f lag«l elseIf I

ag2»l

end If

1test«l

C20

Continue

If ( If l

ag.EQ.0) Then

Call setclr(plyclr)

Call setfll(open)

Cal 1 drwclp( xloc,y1oc,nptloc,xleft,xr Ight ,

ybot , y

top )

If ( If 1

ag2.eq.l )

Then

If ( I

set.EQ.l )

Then

1 low*l 1 up*nl 1 ne

Else1 1 o

w«nl 1 ne

End If

Call setclr(black)

Call drwllnl xone,yone,xl 1 ne( 1 low) , yl 1 ne( 1 low) )

Call drwpl n( xl 1ne,yl Ine, nl Ine)

Call drwl Inlxl 1ne( 1up),yl 1ne( lup) ,

xtwo,ytwo)

Call setclr(plyclr )

End If

End If

Else If

(ans.EQ. 'N' )

Then

1test=0

Else1test»-l

End If

Call setf 11 (sol Id)

If ( lerr .EQ.-l ) 1

test»-l

Else If

(incur. EQ.'Q' >

Then

1test--l

End If

10 End Do

ElseCall

wrtmsg(' Sorry, no

polygons')

1test=-l

End If

CReturn

End

C +£ **************************************************************

C alphon

- Turns the alphanumeric cursor back on.

C"*************************************************************»

Subroutine alphon

cCal1 esccom('a2')

CReturn

End

C + CC

askall - Asks If

user would like to

view/change the parameters

C associated with the enhanced polygon.

C- C

Subroutine askall(ans)

Character quest*80,ans*2

Cans-'y'

quest"' View/change parameters of

enhanced (white) polygon'

Call askynq(quest,ans,-1 ,2 )

CReturn

End

C +wC

askans - Asks the user to confirm that a

previous action Is

C to be carried out.

C-Q ***************************

Subroutine askans(ans)

Character ans*2,quest*80

Cans«*n*

quest"' Do

you wish to proceed*

Call askynqtquest,ans,0,2>

CReturn

End C+ CC

askclr - Asks for Information used to draw a

Denver standard

C grid In

color on

the Envision terminal.

CC ncont

Number of

contour Intervals

C *

0 »

Sets up

terminal for

polygon drawing only

C «

1-12 =

Draws grid with the number of

contours

C Indicated

C -

// = Quit

CC cmln

* Minimum contour level

CC cdel

Contour Interval

C-V*

Subroutine askclr(ncont,cmln,cdel,Itest)

Character quest*80

Ccmln*0.0

cdel=0.0

CWrite (6,15)

15 Format (/,'

To draw the grid In

color

I first need

some',

&' parameters.',

&/,' Enter

the number of

contours',

&/,' 0 Sets up

terminal for

polygon drawing only',

^

. _

&/,' 1-12

- Draws grid with number of

contours Indicated*,

' I S

«,/, ' //

= Quit' ,/)

cC -

Get the number

of contours to

use for

coloring grid.

C1test-0

Do 10

wh11e(1test.EQ.0)

ncont»0

quest-' *Number

of contours (0-12,

// to

quit)' 1 val»1 1 q

uest(quest,neont,M12)*,0)

CIf

( 1va1.EQ.-l> Then

1test--l Else

If (ncont.GE.0.AND.ncont.LE.12) Then

1test»l ElseCall

errmsg

End If

10 End

DoIf

{1test.EQ.-l.OR.ncont.EQ.0)Go To

100 CC

- Get

minimum contour

level. C

quest-' *G1ve

minimum contour

level' cm1n*0.0

1 val*1rquest(quest,cm1n,Mel6.8)',0)

1test*1valIf

(1test.EQ.-l)Go To

100 CC

- Get

contour Interval.

Cquest"'

*G1ve contour

Interval' cdel=0.0

1val=1rquest<quest,cdel,'(el 6.8)',0)

1test«=1valIf

(1test.EQ.0)1test*l

C100

Continue

Return

End C +Q **********************************************************

C askdvl

- Asks

for the

dval to

use In

Initializing a

grid. C-£ **********************

Subroutine askdvl(dval,1 test)

Character quest*80

dval = 'ffff7fff'x C

1test«l 10

Continue

quest*' Dval

for grid'

1 val = IrquesU quest ,dva1 ,

Mel6.8)',16)

If ( 1

val.EQ.-l)1test»-l

CReturn

End C + CC

askend - ASK END - Asks the user before quitting If

the

C model should be written to an output file.

C-

£ *****************************

Subroutine askend(ans)


C

ans«'y'quest**

Save model*

Call askynq(quest,ans,1,1)

CReturn

End

C + CC

askenh -

Asks user

1f polygon drawn 1n

white 1s

correct.

C-\*

Subroutine askenh(ans)

Character ans*2,quest*B0

Cans-'V

quest"' Is

the polygon drawn In

white the

correct one'

Call askynq(quest,ans,-1,2)

CReturn

End C*\*C

askgvl

- Asks the user when generating a GRAVPOLY model file

C which parameters

In the parameter list

should be

C assigned to:

CC lone

Height of

top of

body

C Itwo

* Height of

bottom of

body

C Ithree =

Density contrast of

body

CC-X*

Subroutine askgvl(lone,Itwo,Ithree,1test)

Common /labels/label

Character ans*2,quest*80, label < 1

0)*15

Character usel* 15,use2*15,use3*15

C5 Continue

1one=0

1two=0

1three«0

usel='UNASSIGNED'

use2*'UNASSIGNED'

use3='UNASSIGNED'

CC - Message about parameters that program needs.

CCal1

msggvlCall

wait

CC -

Display the current labels.

CCal1

msglab

CC - Ask for position In

parameter list

of height of

top of

body.

C1test=0Do

10 wh1le(1test.EQ.0)

1one=0quest=' Top of

body (1-10,

0 or

// to quit)'

1 val = 11quest(quest,lone,'{12)',0)

^C

15

If done.GE. LAND. lone.LE. 10)

Then

' ^

usel3label

(lone)

I test-1

Else If

(lone.EQ.0.OR.1val.EQ.-l) Then

1test--l

ElseCal1 errmsg

End If

IB End Do

If (1test.EQ.-DGo To 50

CC -

Ask for position In

parameter 11st of height of bottom of body.

Cltest-0

Do 20 wh11e(1test.EQ.0)

1two-0

quest"* Bottom of oody (1-10, 0 or //

to quit)'

lval-1 1quest(quest,Itwo,'(12)*,0)

CIf

(Itwo.GE.LAND.Itwo.LE.10) Then

use2-label(Itwo)

I test-1

Else If

(Itwo.EQ.0.OR.Ival.EQ.-l) Then

1test--l

ElseCal1 errmsg

End If

20 End Do



parameter list of density contrast.

C1test-0


1three=0

quest-' Density contrast of body (1-10, 0 or //

to quit)'

1val«11 quest(quest,1 three,'(12)',0)

CIf

(Ithree.GE.l.AND.Ithree.LE.10) Then

use3*1abe1(Ithree)

1test*l

Else If

(Ithree.EQ.0.OR.Ival.EQ.-l) Then

1test=-l

ElseCall errmsg

End If

30 End Do


CC -

Display the labels that the user selected and prompt If

these

C are correct, allow changing

If wrong.

C1test-0


Print *,'

You made the following asstgnments»*

Print *,'

Height of top of

body 1s

labeled: ',usel

Print *,'

Height of

bottom of

body Is

labeled: ',use2

Print *,'

Density contrast of body Is

labeled: ',use3

ans='Y'

quest=' Are these assignments correct (y/n/q)'

1va1z1aquest(quest,ans,'(a2)',-2)

CIf

(ans.EQ.'Y') Then

ItestM

-V 1 A

Else If

(ans.EQ.'N') Then

! 1test=2

Else If

(ans.EQ.

1test=-l ElseC

al1 errmsg

End If

Q'.OR.Ival.EO.-l) Then

End Do

If (Itest

EQ.2)Go To 5

C+

CCCC-

C

Continue

If (Itest.EQ.-l) Then

1one*0

1two*0

1three»0

End If

Return

End

asklab - ASK LABel

- Asks the user for the label

associated with a

value array.

name to be

Subroutine ask1ab(label»Itest)

Character labnum*2,oldlab*15,label*15,quest*80

If( Itest. GE.IfIfIfIfIfIfIfIf

Itest.Itest.Itest.Itest.Itest.Itest.Itest.Itest.

If (Itest.

If (Itest.

LAND.

EQ.EQ.EQ.EQ.EQ.EQ.EQ.EQ.EQ.EQ.

1 )2)3)4)5)6)7)8)9)10)

Itest. LE1 abnum** 'labnum* '1 abnum* '

1 abnum* 'labnum= 'labnum* 'labnum= '1 abnum= '

labnum= 'labnum«

. 10)1'2'3'4'5'6'7'8'9'' 10'

Then

o!d1ab=1abe1

1test=0

Do 10

wh11e(Itest.EQ.0)

quest3

' Enter label * '//labnum

1 val = laquest(quest,label,'(a 15)

If

15)

10

Uabe1.EQ.*//*.OR.Ival.EQ.-l) Then

label*'UNASSIGNED'

1test»-l

Else If

(label.NE.'

') Then

1test»l

Elselabel-oldlab

Cal1 errmsg

End If

End Do

C +CC

ElseCall wrtmsg(

1test=-l

End If

Return

End

******************i askmdl

- ASK

MoDel

Error 1n

asklab, Itest out of range*)

- Asks for the name of

the user's model

17

c- c

Subroutine askmdT(modnam,1 test)

Character tempnm*80,modnam*80,quest*80

Ctempnm=modnam

1test=0

Do 10

while?1test.EQ.0)

quest"' Model name*

1val =laquest(quest,modnam,*(a80)',80)

CIf

( 1val.EQ.-l) Then

1test--l Else

If (modnam.NE.'

') Then

1test-lElse

If (modnam.EQ.'

') Then

modnam=tempnm

Call errmsg

End If

10 End

Do C

Return

End

C +

C askmoc - ASK Mouse Or Cursor

- Asks the user to select the

C Envision

mouse or

cursor keys

for entry of

locationsCC

mcur = Mouse/Cursor

C (note:

answer

1s returned

upshlfted)

C m

« Mouse (default)

C c

= Cursor keys

C q

- Quit

CC

\+

Subroutine askmoc(mcur)

Character mcur*2,quest*80

C1test=0

If (1test.EQ.0)

Then 10

Continue

mcur* *m*quest*'

Mouse or

cursor keys

(m/c/q)' 1va1=1aquest(quest,mcur,'(aZ)',-2)

CIf

( Ival.EQ.-l.OR.incur.EQ. *Q* )

Then

mcur«'Q'

1test"-l

Else If

(mcur.EQ.'M'.OR.mcur.EQ.'C') Then

1test=l

ElseCall

errmsg

End If

If (1test.EQ.0)

Go To

10 End

If C

Return

End C +

C askmpp

- Asks

the user

what method to

user when picking a

*< f v

C polygon.

C-

*************************************************************

Subroutine askmpp(ans)

Character ans*2 ,ques ,,*80

1test-0

ans-'h'

Do IF

whlleCltest.EQ.0)

quest*' Method for picking polygon (c/m/h/q)'

1 val- 1 a

quest(quest,ans,'(aZ)',-2)

If (ans.EQ.'C'.OR.ans.EQ.'M') Then

1test-l Else If

(ans.EQ.'Q*.OR.Ival.EQ.-l) Then

ans='CT

1test-l Else If

(ans.EQ.'H') Then

Cal1 hlpmpp

ElseCal1

errmsg

End If

IF End Do

Return

End

OC C C C C C C C C C C C C C C Cc- c

askmvl

- Asks the user

when generating a MAGPOLY model file

which parameters

In the parameter list should be assigned tot

lone *

Height of

top of

body

1 two

= Height of

bottom of

body

Ithree = Volume magnetic susceptibility (emuX100000)

Ifour = Remanent or

total volume magnetization

(emuX100000).

Iflve

= Declination of

remanent or

total magnetization

In degrees, measured positive clockwise from

the direction of

the y

axis.

Islx =

Inclination of

remanent or

total magnetization

In degrees, measured positive downward from

the horizontal plane.

SubroutIne askmvl(lone,1 two,Ithree,Ifour,If 1ve,Islx,1 test)


Character ansZ*2,ans*2.quest*80,label(10)*15

Character*15 usel,use2,use3,use4,use5,use6

5 Continue

1one=0

1two=0

1three=0

1four=0

If1ve=0

1s1x=0

usel='UNASSIGNED'

use2='UNASSIGNED'

use3='UNASSIGNED'

use4='UNASSIGNED*

use5='UNASSIGNED'

use6='UNASSIGNED'

- Message about what Information Is

to be provided.

Ca11 msgmvl

Call watt

CC - Display the current labels.

CCal1

msglab

CC - Ask

for position In

parameter 11st

of height

of top

of body.

C1test»0

Do 10

While (1test.EQ.0)

1one*0quest**

Top of

body (1-10,

0 or

// to

quit)' 1val» 1 1 q

uest(quest,lone,'(12)*,0)

CIf

(lone.GE.LAND.lone.LE.10) Then

usel*1abel(tone)

ltest-1 Else If

(1one.EQ.0.OR.1val.EQ.-l) Then

ltest*-l ElseCall

errmsg

End If

10 End

DoIf

(1test.EQ.-l)Go To

100 CC

- Ask

for position 1n

parameter 11st

of height

of bottom of

body. C

1test«0

Do 20

While (1test.EQ.0)

1two*0quest=* Bottom of

body (1-10, 0 or

// to quit)'

1 va1 = 1 1 quest(quest,Itwo,'(12)',0)

CIf

<Itwo.GE.LAND.Itwo.LE.10) Then

use2=label(Itwo)

1test«l

Else If

(1two.EQ.0.OR.Ival.EQ.-l) Then

1test=-l

ElseCal 1

errmsg

End If

20 End Do

If (1test.EQ.-l)Go To

100 CC

- Ask

for position In

parameter list

of Volume magnetic susceptibility.

C1test»0Do

30 While (1test.EQ.0)

1three-0quest*'

Volume magnetic susceptibility (1-10,

0 or

// to

quit)' 1val = 1 1 q

uest(quest,1 three,'( 12)',0)

CIf

(Ithree.GE.l.AND.Ithree.LE.10) Then

use3*1abel(Ithree)

1test=l

Else If

(Ithree.EQ.0.OR.Ival.EQ.-l) Then

1test=-l

ElseCal1 errmsg

End If

30 End Do

If ( I

test.EQ.-l )Go

To 100

C -

Ask for position 1n

parameter list of remanent or total volume

C magnetization.

C1test-0

Do 40 While (Itest.EQ.0)

1four»0

quest"' Remanent or total volume magnetization (1-10,

& 0 or //

to quit)'

1val«11quest(quest,Ifour,M12)',0)

CIf

(Ifour.GE.l.AND.Ifour.LE.10) Then

use4*label(1four )

Itesfl

Else If

<1four.EQ.0.0R.1val.EQ.-l) Then

1test--l

ElseCall errmsg

End If

40 End Do


CC -

Ask for position 1n

parameter list of Declination of remanent or

C total magnetization.

C1test«0

Do 50 While (1test.EQ.0)

1f1ve-0

quest-' Declination of remanent or total magnetization

& (1-10, 0 or //

to quit)'

1val«11 quest(quest,1f1ve,'(12)',0)

CIf

(IfIve.GE.LAND.IfIve.LE.10) Then

useS-label(If1ve)

1test=l

Else If

(1f1ve.EQ.0.0R.Ival.EQ.-l) Then

1test=-l

ElseCal1 errmsg

End If

50 End Do



parameter list of Inclination of remanent or

C total magnetization.

C1test»0

Do 60 While (Itest.EG.0)

1s1x«0

quest*' Inclination of remanent or total magnetization

& (1-10, 0 or //

to quit)'

1val-11quest(quest,1s1x,'(12)',0)

CIf

( Islx.GE.l.AND.1s1x.LE.10) Then

useG-label(Islx)

1test=l

Else If

( Islx.EQ.0.OR.Ival.EQ.-l) Then

1test=-l ElseC

al1 errmsg

End If

60 End Do


C - Display the labels that the user selected and prompt If

these

c cC65

arc correct, allow changing If

wrong

68

cont1nu«

1test-0

Do 70 While

Write (6

Format (/,*

Print *,

Print *,

Print *,

Print *,

&1abe1ed:

Print *,

labeled:

(Itest.EQ.0)

,68)You have made

Height of

Height of

the following assignments:',/)

top of

body Is

labeled: *,usel

bottom of

body Is

labeled:

f,use2

Volume magnetic susceptibility 1s

labeled: ',use3

Remanent or

total volume magnetization

Is

&1s

&1s

,use4*,'

DeclInatIon

use5Incl1natIon

use6

Print *,

labeled:

ans2-'Y'

quest-' Are these assignments

1 va 1 » 1 aques t( q

uest, an s2, * (a2)

If (ans2.EQ. 'Y* )

Then

nlabel (2,1)* lone

n label (2,2)»1two

nla

be

l<2

,3)»

1t

ure

enlabel (2,4)-1four

nlabel <2,5) = 1f Ive

nlabel(2,6)'1s1x

lval-'M'

call setlbl(lval)

1test-l Else If

(ans2.EQ

ltest-2

Else If

(ans2.EQ

ltest=-l ElseCa 1 1

errmsg

End If

of remanent or

total magnetization

of remanent or

total magnetization

correct

, -2)(y/n/q)*

NM Then

Q*.OR.Ival.EQ.-l> Then

70End Do

If {Itest

EQ.2)Go To 5

100 Continue

If (Itest.EQ.-l) Then

1one=0

1two=0

1three=0

Ifour=0

If1ve=0

End If

Return

EndC +CCCC

asknam - ASK NAMe

- Asks the question In

string quest for

an 80

character string (name).

Formats the answer

using Saltus' laquest subroutine.

*************************************************************

Subroutine asknam(name,quest,Itest)

Character name*80,quest*80

1test=0

Do 10

wh11e(Itest.EG.0)

22

name** *

1 val -laquesKquest, name* '(a80)',0)

CIf

<Ival.EO.-l.OR.name.EQ.*//') Then

itest«-l Else If

Cname.NE.' ')

Thenitest-1

ElseCall

errmsg

End If

10 End

Do C

Return

End C +

C askok

- Asks users

if current state information

displayed at

C terminal

is OK.

C-CSubroutine askok(ans)


Cans»'Y'

quest-' *

OK'Call

askynq(quest,ans,-1,2)

CReturn

End C +£ *************************1

C askply - Asks

1f user

wants to

draw another

polygon. C-£ **************************************************************

Subroutine askply(ans)


Cans='y'

quest*' Draw another polygon'

Call askynq(quest,ans,-1 , 2 )

CRetur«nEnd

C + \*C

askpnt - Asks user

if corner of polygon selected

Is to be used.

C-V*

Subroutine askpnt(ans)


Cans='Y'quest='

Use the

corner where the

polygon was

selected'Call

askynqlquest,ans,-1,2)

CReturn

End C +L-C

askqst

- Asks the question in

the string quest.

V* ""

£ A*********************'

Subroutine askqst(ans.quest,itest)


1test«0Do

10 wh11e<ttest.EQ.0)

ans =' '

1 va 1«laquest(quest,ans,'(a2)',0)

CIf

(1val.EQ.-l.OR.ans.EQ.'//') Then

1test«-l Else If

Cans.NE.' M Then

1test=l ElseCal1

errmsg End

If 10

End Do

CReturn

End C +£ **************************************************************

C askrot

- Asks

the user

If the

corner of

the polygon picked

C should

be used

to rotate the

polygon about.

C-Q **************************************************************

Subroutine askrot(ans)


Cans='Y'quest*'

Rotate polygon about corner

picked'Call

askynq(quest,ans,- 1,2)

CReturn

End C +Q **************************************************************

C askrtZ

- Asks

the user

If another corner

of the

polygon should

C be used to rotate about Instead.

C-

Q **************************************************************

Subroutine askrtZ(ans)


Cans='Y'quest='

Rotate polygon about a

different corner

of this

polygon'Call

askynq(quest,ans,-1,2)

CReturn

End

C +Q **************************************************************

C ASKSTO - ASKS IF

UStK WANTS TO START OVER DRAWING POLYGON

C CALLED BY SUBROUTINE ADDPLY (ADD POLYGON).

C-

Q **************************************************************

Subroutine asksto(ans)


Cans='y'quest=' Start over entering polygon'

Call askynq(quest,ans,-1,1)

Return

«*«. ;

24

End

C +£ ****************************************1

C asksub - Asks the user for

the locations (ncmin,ncmax,nrmln,

C nrmax) of

the subgrld.

C-

Subroutlne asksub(1 test)

DlmensIon xgr1d(2),ygr1d(2),xscrn(2),yscrn(2)

Common /grIdspec»/1d,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,bl

Common /subgrld/lcmln,Icmax,Irmln,1rmax,ncm1n,ncmax,nrm1n,nrmax

Character 1d*56,pgm*8,Intype*1

C1test-0

Do 15

wh11e(1test.EQ.0)

Write (6,20)

20 Format (/,'

Enter ncmin,ncmax,nrmln,nrmax (0**s to',

4' quit): ',$)

Read (5,25)ncm1n,ncmax,nrm1n,nrmax

25 Format (413)

CIf

((ncm1n.EQ.0.0).*ND.(ncmax.EQ.0.0).AND.(nrmln.EQ.0.0).

&AND.(nrmax.EG.0.0)) Then

1test=-l

Else If

((ncmin.LE.0).OR.(ncmax.LE.0).OR.

Alnrmln.LE.0).OR.(nrmax.LE.0)) Then

Write (6,30)

30 Format (/,'

Illegal value entered...try again')

Else If

((ncmin.GT.nc).OR.{ncmax.GT.nc).OR.(ncmin.GE.ncmax))

& Then

Write (6,35)

35 Format (/,*

Error

1n column boundar1es... try again')

CElse If

((nrmln.vT.nr).OR.(nrmax.GT.nr).OR.(nrmln.GE.nrmax))

& Then

Write (6,40)

40

Format (/,'

Error

In row boundarles... try again')

Else1test=l

Cxgr I

d(1)*ncm1n

xgr1d(2)=ncmax

ygr1d(1)=nrm1n

ygr 1d{2 ) = nrmax

CCal 1

fndscn(xscrn,yscrn,xgr1d,ygr1d,2)

Clntype='6'

Call setl1n(Intype)

Cal1 drwl1n(xscrnf1),yscrn(1),xscrn(1),yscrn(2))

Call drwl1n(xscrn(l),yscrn(2),xscrn(2),yscrn{2))

Call drw11n(xscrn(2),yscrn(2),xscrn(2),yscrn(l))

Call drwl1n{xscrn(2),yscrn(l),xscrn(l),yscrn(l))

CCall

zomstr(1test2)

CEnd

If 15

End Do

CReturn

End

C +£ **************************************************************

C asktwz

- Prints twilight zone message If

user wants to enter

C polygon with only two points.

Subroutine asktwz(ans)


CWrite (6,10)

10 Format (/,'

Are you In

the twilight zone???

You have only',

&' entered two points...')

C1test-0

If (1test.EQ.0> Then

20

Continue

ans='e'

quest

58' Do you wish to enter a

point or

quit (e/q)'

1 va1*1aquest(quest,ans,'(a2)',0)

CIf

(tval.EQ.-l) Then

ans«'CT

1test»l

Else If

(ans.EQ.'E'.OR.ans.EQ.'QM Then

ItestM

ElseCall errmsg

End If

If (1test.EQ.0)Go To 20

End If

CReturn

End

C +

C asktyp

- Asks for

the type boundary picking to be employed In

C the zoom command.

CC Itype =

Flag for

type of

boundaries

C "

1 = Cursor/Mouse entered screen boundaries

C "

2 * Subgrld boundaries given as

ncmln.ncmax,

C nrm1n,nrmax

C-\+

Subroutine asktyp(Itype,1 test)

Character quest*80

C1test-0

Ca11 msgsub

Do 10

wh11e(1test.EQ.0)

1type=l

quest=' Which method for

boundaries (1/2)'

1va1 = 11 quest(quest,Itype,'( 12) ' ,2)

CIf

(Ival.EQ.-l.OR.Itype.E0.0) Then

1test--l

Else If

(Itype.NE.1.AND.Itype.NE.2) Then

Cal1 errmsg

Else1test«l

End If

10 End Do

CReturn

End

C +

C askval

- ASK VALue - Asks for

which one of

the ten parameters In

C In

the parm* arrays to use when resetting the grid.

C-

Subroutine askval{Iset,ulabel,Itest)


Character ulabel* 15,label(IF)M5,quest*8F

CC -

Print message about selecting value (msgval).

CCall

msgval

CC -

Display the current labels.

CCall

msglab

CC - Ask question, test answer (Iset), and assign label

If C

answer

Is valId.

C1test«F

Do IF

whlleCItest.EQ.F)

quest"' Which parameter to use (1-1F,

F or

// to

quit)'

1val*11quest(quest,Iset,'(12)',F)

CIf

(Iset.GE.l.AND.Iset.LE.IF) Then

u1abe1

slabel(1 set)

1test-l Else If

(Iset.EQ.F.OR.Ival.EQ.-l) Then

1test--l

ElseCall

errmsg

End If

IF End Do

CReturn

End

C +V*C

askvot - Asks user

If verbose ("V")

or terse ("T")

prompts

C Is

desired.

C-V*

Subroutine askvot(ans)

Character ans*2,quest*8F

CItest'F

Do IF

wh11e(Itest.EQ.F)

ans ='t'

quest*' Do

you want verbose or

terse prompts (v/t/q)'

1va1=1aquest(quest,ans,'(a2)', -2)

CIf

( Ival.EQ.-l) Then

ans«'Q'

1test«l Else If

(ans.EQ.*W.OR.ans.EQ.'T*.OR.ans.EQ.*Q*) Then

1test-l ElseCall

errmsg

End If

IF End Do

CReturn

End C +\4

C askynq - Constructs a

yes/no/qult question from the text string

C passed to

1t under control of

the parameters IDEF,

and

IYNQ.

Answer

1s returned

1n character*?.

IDEF -

Flag for

If default answer

Is allowed.

» 1

- Default Is

allowed, answer returned as entered

0 -

no default

1s allowed, and upshift answer.

=-1 -

Upshift answer and allow default.

IYNQ -

Flag for type of Yes/No/Quit prompt

2

- (y/n/q)

Is added to text string, user supplied

default Is

tested and used.

1

- (y/n)

Is added to text string, user supplied

default Is

tested and used.

-1 -

(y/n)

Is added to text string, "n"

Is used

as the default answer.

= -2 -

(y/n/q)

Is added to text string, "q"

1s used

as the default answer.

i*« *********** **i

Subroutine askynq(quest,ans,1def,lynq)

Character prompt*88,quest*80,ans*2,defans*2

If lag-labs?lynq)

If (If l

ag.EG.1.OR.If lag.EQ.2) Then

lenqst*1tlen(quest)

If (Iflag.EQ.1) Then

prompt=quest(1:lenqst)//' (y/n)'

Elseprompt"quest(l:lenqst)//' (y/n/q)'

End If

If (Idef.NE.0) Then

If ( I

flag.EQ.2) Then

If (1ynq.EQ.-2) Then

ans='q'

ElseIf

((ans.NE.'y'.AND.ans.NE.'Y').AND

& (ans.NE.'n'.AND.ans.NE.'N').AND.

& (ans.NE.'q'.AND.ans.NE.'Q'))ans='q'

End If

ElseIf

(1ynq.EQ.-l) Then

ans='n'

ElseIf

((ans.NE.'y'.AND.ans.NE.'Y').AND

& (ans.NE.'n'.AND.ans.NE.'N'))ans='n'

End If

End If

End If

1set=2*ldef

If (Idef.GE.-l.AND.Idef.LE.1) Then

1test=0

defans=ans

10 Continue

1 va 1 = 1aquest(prompt,ans,'(a2)'.

If

Iset)

( Ival.EQ.-l) Then

If ( If l

ag.EQ.2)ans='Q'

If ( I

flag.EQ.1)ans='N'

1test=l

Else If

((ans.EQ.'Y'.OR.ans.EQ.'y').OR

(ans.EQ.'N'.OR.ans.EQ.'n').OR.

28

& Mans.EQ.'Q'.OR.ans.EQ.'q*).AND.Iflag.EQ.2)) Then

1test=l

Elseans«defans

Cal 1 errmsg

End If


End If

End If

CReturn

End C +\«C

boundpoly -

Find an

Inner and out boudlng polygon around

C the polygon passed In

the arrays xpoly,ypoly.

C C->*

Subrout1ne boundpoly(1test,x1n,y1n,xout,yout,xpoly,ypoly,nbrpts,

& del I

n,delout)

DlmensIon xpoly(nbrpts),ypoly(nbrpts),x1n(nbrpts),y1n(nbrpts),

& xout(nbrpts),yout(nbrpts)

CIf

(nbrpts.LE.2) Then

1test=-l

Else

CDo

ISI 1*1 ,

nbrpts

If ( 1 .EQ.1)

Then

xlast=xpoly(nbrpts)

ylast=ypoly(nbrpts)

xnext^xpolyt 2)

ynext«ypoly(2)

Else If

{1.EQ.nbrpts) Then

xlast=xpoly(nbrpts-1 )

ylast=ypoly(nbrpts-1)

xnext=xpoly(1)

ynext=ypoly(1)

Elsexlast=xpoly(1-1)

ylast=ypoly(1-1)

xnext=xpoly(1+1)

ynext=ypoly(1+1)

End If

Cxavec=xlast-xpolv(i)

yavec«ylast-ypoly(1)

Cxbvec«xn*xt-xpoly(1)

ybvec«ynext-ypoly(

\)

CC -

Find the angle theta between vectors A and B

(xavec,yavec,

CC 1)

Find the vector Dot product of

A*B

C II)

Find the norm of

the vectors A,

B. C

dotprd=xavec*xbvec+yavec*ybvec

anorm=sqrt(xavec*xavec-»-yavec*yavec)

bnorm=sqrt(xbvec*xbvec-»-ybvec*ybvec)

If (anorm.It.1.0e-12) anorm=1.0e-12

If (bnorm. It. 1 .0e-12)

bnorm= 1 .

0e-12

theta=acos(dotprd/(anorm*bnorm))

angle»theta/2.0

Cxdvec=cos(angle)*xavec-s1n(angle)*yavec

ydvec*s1n(angle)*xavec+cos(angle)*yavec

Cdnorm»sqrt(xdvec*xdvec+ydvec*ydvec)

1f (dnorm.It.1.0e-12) dnorm=1.0e-12

Cxdun1t*xdvec/dnorm

ydun1t=ydvec/dnorm

Cxtest»xpoly(1)+xdun1t

ytest«ypoly(1)+ydun1t

CC -

Test the

two points (xtest,ytest) to

see If

they are within

C or

outside of

the polygon npoly.

This determines how

to C

find the

coordinates of

the polygon bounded on

the Inside

by C

del In and

outside by

delout. C

Cat 1 p1ytst(xpoly,ypoly,nbrpts,xtest,ytest,Inout)

CIf

(Inout.EQ.l) Then

par1tya +1

Elsepar1ty»-l

End If

Chyp1n«abs(de11n/s1n(angle))

hypout=abs(delout/sIn(angle))

CC -

Now construct the corner points for the Inner and outer boulndlng

C polygon.

Cx1n(1)»xpoly(1)+par1ty*hyp1n*xdun1t

y1n(1)=ypoly(1)+par1ty*hyp1n*ydunIt

xout(1)=xpoly(1)-par1ty*hypout*xdun1t

yout(1)=ypoly(1)-par1ty*hypout*ydun1t

10 Continue

1test=l

End If

CReturn

End

O

CC chgall

- Allows the changing of all values associated with

C every polygon

In the tree.

Starts at top (root)

C node of

tree, enhances polygon, prompts for change,

C allows setting of values and finds next node (poly-

C gon)

In tree.

C-

\*

Subroutine chgall

Dimension xpoly(1. 0),ypoly(100)

Common /screenloc/ntota1,numply(100) , x

scr U00, 100 ) ,

yscr ( 1

00,100)

Common /topology/1nfo<100),1 upper(100),1down(100),

&1left(100),1r1ght<100)

Common /screenbnd/xleft.xrlght,ybot,ytop

Common /zoom/1 zoom,1zval,nzoom.ncmlnz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5 )

Common /colors/p1yc1r,black,whIte

Common /f111/open,sol Id,f11typ

Character ans*2,open*!,sol1d*l,f11typM,p1yc1r* 1,black*1,wh1te*l

Call fndtop(ntop)

If (ntop.GE.l) Then

CC -

Print message about assigning values to polygon In

white.

CCa11

msgal1

Call watt

Cngon=ntop

next=ntop

1test'0

Do 10

wh11e(1test.EQ.Jfr) npoly»lnfo(ngon)

CC -

Enhance polygon and prompt

CCall setclr(whlte)

Call setfll(open)

nbrpts=numply(npoly)


Do 20

1=1.nbrpts

Call trans(xpoly(1),ypoly(1),xscr(npoly,1),yscr(npoly,1))

20 Continue

ElseDo

25 J-l,nbrpts

xpoly(J)=xscr(npoly,J)

ypoly(J)=yscr(npoly,J)

25 Continue

End If

Call drwcIp(xpoly,ypoly,nbrpts,x1eft,xr1ght,ybot,ytop)

CC -

Ask

If user wants to

see/set values

CCa11

aska11(ans )

CIf

(ans.EQ.'V) Then

lset=0

Call valchg(npoly,Iset,lerror)

Else If

(ans.EQ.'Q*) Then

ltest=-l End

If CC

- Unenhance polygon

CCall

setclr(plyclr)

Call setfll(open)

Cal1 drwclp?xpoly,ypoly,nbrpts,xleft,xrIght.ybot,ytop)

Call setf IKsol Id)

CIf

(ltest.EQ.0) Then

Call wa1k(next,ngon,Ierr2)

If (1err2.EQ.1) Then

ngon«next

Else If

(1err2.EQ.J0) Then

1test«l Else If

(lerr2.LE.-l.OR.next.LT.0) Then

1test=-l

End If

End If

10 End

Do ElseCall

wrtmsg(*

Sorry, no

polygons')

End If

Return

End

O\*C chglab

- CHanGe LABel

- Allows changing the labels assocl-

C ated with the value* arrays.

C-

Subrouttne chglab( Itest )

Common

/ label s/ labelCharacter quest *80, label < 10)* 15 , u label * 15

CC -

Display the current settings for

the labels.

CCal 1

msglab

CC -

Ask which label

to change, test answer, and set label.

C1test-0

Do 10

wh11e( Itest. E

Q.0)

quest-' Label

to change (1-10,

-1 for

all, 0 or

// when done)'

IvalM 1 q

uest (quest, 1 lab , ' ( 12 ) ' , 2 )

CIf

(1va1.EQ.-l.OR.11ab.EQ.*) Then

ltest-1Else If

(11ab.EQ.-l) Then

1-1ltest-0

Do 25

wh11e( Itest. E

Q.0)

ulabel=1abel ( 1 )

1error= 1

Call ask lab< u

label , terror )

If ( l

error.EQ. 1 )

Then

label ( 1 )=u1abel

1 = 1 + 1 Else If

( lerror.EQ. -1 )

Then

1test=-l

End If

If ( 1 .GT. 10) 1test=l

25 End Do

Else If

( llab.GE. 1 .AND. llab.LE. 10)

Then

ulabel=1abe1 ( llab)

ler ror = 1 1 abCall

ask lab( ulabel , lerror )

If ( l

error.EQ. 1 >

Then

label ( 1 Iab)=u1abe1

Else If

( lerror. EQ.-l )

Then

1test«-l

End If

ElseCall

errmsg

End If

10 End

Do C

Return

End C +

C chgpar

- Allows the changing of

parameters associated with polygons

-J C. C-

Subroutlne chgpar { 1 t

est )

Character quest*80, ans*2

cCall

enhmsgC'*** Change parameters ***»)

C!test-0

ansa *h*

Do 10

wh11e(ftest.EQ.0)

quest*' Change parameter mode (a/p/h/q)'

1va1=1aquest(quest,ans,'(a2 )',-2)

CIf

(ans.EQ.'A') Then

Call chgall

Else If

(ans.EQ.'P') Then

Call chgpck

Else If

(ans.EQ.'H*) Then

Call hlppar

Else If

(ans.EQ.'Q'.OR.1val.EQ.-l> Then

1test«l ElseCal1

errmsg

End If

ans='q'

10 End Do

CReturn

End

chgpck - Allows the parameters for

individual polygons to

be

r** *****

Subroutine chgpck

Common /screenloc/ntotal,numplyt100), xscr(100,100),yscr(100,100)

Common /polyloc/nptloc,xloc(100),yloc(100)

Common /f1ags/mcflag,votfIg

&nrmaxz(5)

Common /screenbnd/xleft,xr1ght,ybot,ytop

Common /colors/piyclr,black,white


Character open*!,solIdM,f1ltyp*l,plyc1r*l,black*1,white*!

Character votflg*2,mcf1ag*2,mcur*2,ans*2,ans2*2

C1test=0

CC -

Test the number of

polygons ntotal, exit If

<=0. C

If (ntotal.GT.0) Then

CC -

If cursor type has not been selected prompt for

type. C

If (mcflag.EQ.'N') Then

Call askmoc(mcur)

If (mcur.EQ.'Q') Then

1test=-l

Elsemcf1ag=mcur

End If

Elsemcur=mcflag

End If

CC - Start looping until polygon Is

found (1test=l), or

user

C wants to quit (1test=-l).

C

Do 10

wh11e(Itest.EQ.0)

If (mcur.EQ.'M'.OR.mcur.EQ.'C') Then

CC -

Find polygon* enhance and return npoly,ncorn,x,y.

CCall

pckplylnpoly,ncorn,x,y,ans,mcur,lerr)

If (lerr.LE.-l) Then

1test--l

Go To 10

End If

CC - When correct polygon

Is found, prompt for

parameters.

C CIf

(ans.EQ.'YM Then

lset-0

Call valchg(npoly,Iset,ItestZ)

1test-l Else If

(ans.EQ.'NM Then

1test=0

Elseltest»-l

End If

CCall

setclr(plyclr)

Call setfll(open)

Cal1 drwclp< xloc,yloc.nptloc,xleft,xrIght,ybot,ytop)

Call setf 1 K

sol Id)

Else If

(mcur.EQ.'CT >

Then

1test=-l End

If10

End Oo

ElseCall

wrtmsgt* Sorry, no

polygons')

1test=-l End If

CReturn

End

C + \*C

chgply - CHanGe PoLYgon -

Driver for

Change polygon para-

C meter mode.

Options are:

CC 1

- Labels

C p

* Parameters associated with polygons

C h

- Help

C q

Quit and return to Polygon add/.../edit mode

C C-

Subroutlne chgp1y(Itest)


CCall

enhmsg('*** Change_parm mode ****)

C1test=0

ans='h'

Do 10

wh11e(Itest.EQ.0)

quest=' Change polygon parameters (1/p/h/q)*

1val = 1aquest(quest,ans,'(a2>' ,2)

CIf

(ans.EQ.'L'.OR.ans.EQ.'1') Then

Cal1 chglab(lerror)

Else If

(ans.EQ.'P'.OR.ans.EQ.'p') Then

Call chgpar ( lerror )

Else If

(ans.EO. *H' .OR.ans.EQ. 'h* ) Then

Call hlpchg

Else If

(ans. EQ. 'Q' . OR. Ival .EG. -1. OR.ans.EQ. 'q')

Then1test-l

ElseCal 1 errmsg

End If

anss 'q'

10 End

Do

Return

End

clipper -

Clips the

line segment

( xl ,yl ) , ( x2 ,y2 ) passed to

Itccccccccc-c **

cc

to fit

In the

window defined by

the x,y:

xleft<x<xr Ight

ybot<y<ytop

Clipper assumes that the line

segment passed to

It does

Indeed cross

the given window;

use tstend to

determine

whether a

line segment does

Indeed cross

window.

******************************************************

Subroutine cl 1

pper(x,y,xl,yl ,x2,y2,xleft,xr Ight ,ybot

delx=x2-xl

dely=y2-yl

*******

, ytop )

If (abs(dely).LT.l.e-16)dely=s1gnU.e-16,dely)

If (abs(delx).LT.1.e-16)delx=s1gn(1.e-16,delx)

Cslope*dely/delx

b=y2-slope*x2

CC -

Clip along

top or

bottom edges.

C

If (*yl .GT.ytop)

Then x = (ytop-b)/si ope y-ytop

Else If

(yl.LT.ybot) Then

x = (ybot-b >/siope y=ybot

End If

cc -

Clip along

left or

right edges.

cIf

(x.GT.xrIght) Then

x = xr Ighty=slope*xrIght+b

Else If

(x.LT.xleft) Then

x=xleft

y = s1 ope*x1eft+b

End If

CReturn

End »

35

c- cc cc+ccc-cc+ccccccccc-c

Subroutine closup

Call graphoff

Return

End

»**** clrply - Sets up the values used for coloring a polygon.

*************************************************************

Subroutine clrply

Common /colors/plyclr,black.white

Common /calc/ncont,cmin,cdel

Character plye 1r*1,black*1,white*!

black-'fl* white-'!'

If (ncont.GT.0) Then

p1yclr»char(ncont+3+1char{'0'))

Else If

(ncont.EQ.0) Then

piyclr=char(neont+4 + 1

chart'0'))

End If

Return

End

r*********************************************************************

clrsgd - Subroutine to color a

grid on

the Envision screen.

Author: Robert W.

Slmpson, USGS,

Menlo Park, CA.,

11/83.

Converted to a

subroutine by Bruce Chuchel, USGS,

Menlo Park,

CA., 2/84.

Subroutine clrsgdC If 1 r

st,1 test)

Common /gridspecs/Id,pgm,nco1,nrow,nz,xo,dx,yo,dy,IproJ,cm,bl

Common /scale/ xsc,ysc,xstart,ystart,x

\n1t,y1n1t


Common /cmdstrlng/ cmdstrlng

Common /cmd1ength/lengstr

Common /lodev1ce/loun1t

Common /gr1d/grd(250000)

Common /sealefacts/1wc0,Jwc0,nxp1x,nyp1x,p1xd1m

Common /calc/ncont,cm1n,cdel

Common /colors/piyc1r,black,whIte


Character plyclr*!,black*!,white*!,open*l,sol1d*l,f1ltyp*l

Character 1d*56,pgm*8,rect*13,wcbp*5,ans*2,esc*1

Character color*3,actw1nd*l,cmdstr1ng*200

Parameter (esc=char(27))

lengstr=0

Find range of

values

If ( If 1

rst.EQ.0)Go To 30

Call gmaxmln

20 Continue

Call askclr<neont,cm1n,cdel,1 test)

36

If Utest.EQ.-l)Go To 100

30 Continue

actw1nd='0*

loun1t=6

CC - Scale grid to screen

CIf

(Iftrst.EQ.l) Th*n

Cal1 sca1eg2sc(1)

ElseCall scaleg2sc(0)

End If

If (1fIrst.EQ.1.AND.ncont.GT.0) Then

Ca11 askok(ans)

End If

If Cans.EO.'N'.AND.1fIrst.EQ.1)Go To 20

If (ans.EQ.'Q') Then

1test--l

Go To 100

End If

CC - Set up color screen and spectrum

CCall blnsetupZt1oun1t,actw1nd)

ncolors

ancont+1

nsh1ft=0

If ( 1f I

rst.EQ.1) Then

Call envclr(1oun1t,ncolors,nsh1ft)

Call InkJet(1oun1t,ncolors)

End If

CC - Set full screen to lowest color

C1clr»0

Call sendcmd(lounlt,color(1cl r))

If (ncont.EQ.0)Go To 50

CC -

Go thru grid once for each color...

CDo 50 1c«l,ncolors

1clr=1c

Call sendcmd(1oun1t,color(1clr))

Do 50 J*nrm1n,nrmax

1left*ncmax+l

1rt=ncm1n-2

Do 50 1=ncm1n,ncmax

C -

Determine color from grid value...

If <grd< 1+(J-1 )*ncol ) .GE. 1 .

0e+38) Then

1clr«0

C this sets dvals to black

Else1clr-n1nt<(grd(1 + C J

-l>*ncol)-cm1n)/cdel+0.5)+ 1

1clr*max(1clr,1)

1clr»m1n(1clr,ncolors)

End If

C -

make rectangles from contiguous boxed of

the same color

C In

the present row...

If (1clr.GE.1c) Then

1 Ieft = m1n(1left,1)

1rt=max(Irt,1)

If (1rt.EQ.ncmax)Cal1 sendcmd(1oun1t,rect(lieft,J,1rt,J))

Else If

(Irt.EQ.1-1) Then

-* -, Call sendcmd(1oun1t.rect(lleft,J,1rt,J)>

*» J) /

1left=ncmax+1

End If

50 Continue

If (ncont.EQ.0) Then

xl-xlnlt

yb * y 1 n 11xr«xInlt+tncmax-ncmln+1>*nxp1x

ytsy1n1t+(nrmax-nrm1n+l)*nyp1x

Call setclr(whlte)

Call setfll(open)

Call drwbox(xl,yb,xr,yt)

End If

C -

FInlsh up. . .

Call sendcmd(lounlt,'end*)

100 Continue

CReturn

End

C+ CC

- Prints Maximum, Minimum, Average and Standard Deviation

C about the grid file.

C-Q ft*************************************************************

Subroutine gmaxmln


Common /gr1dspecs/1d,pgm,nc,nr,nx,xo,dx,yo,dy

Character 1d*56,rgm*8

ngood=0

zmax=grd(1)

zm1n*grd(1 )

zsum»0.

zsqsum=0.

Do 45

J*l,nr

Do 45

1=1,nc

zval=grd(1+(J-l)*nc)

If (zval.LT.1.0e38) Then

ngood=ngood+1

zm1n-am1nl(zm1n,zva1)

zmax=amaxl(zmax,zva1)

zsum=zsum+zval

zsqsum=zsqsum+zval**2

End If

45 Continue

zave=zsum/ngood

zsdev*sqrt((zsqsum-zave**2)/ngood)

twosdev=2*zsdev

Pr IntPr Int

* Print *

PrInt *

Print *

Here are some facts about the grid values.'

i

MIN, MAX,

AVE=',zm1n,zmax,zave

PLUS/MIN 2 SD=',zave-twosdev,zave+twosdev

Return

End C +£ **********************************************************************

C b1nsetup2

- Sets up

the Envision terminal (window actwlnd)

C for

graphics.

C-£ **************************************************************

Subroutine b1nsetup2(loun1t.actwlnd)

Character esc* 1 ,actwl nd* 1

38


^

C -

Erase screen...

Write <lounlt,1001)esc//'C20'

C - Move cursor home...

Write (lounlt,1001>esc//'th"

C -

Set scrolling to line

1 to 15...

C wr1te(lounlt,1001> esc//'t1;15r'

C -

Set binary number mode...

Write (lounlt,1001>esc//'OR0'

C - Set active window number...

Wr Ite (lounlt,1001>esc//'OA'//actwlnd

C -

Erase graphics screen to current background color

Write (lounlt,1001)esc//'F'

C -

Kill active window...

Write (lounlt,1001)esc//'OK*

C -

Set figure f 111 . . .(7)

Write (lounlt,1001)esc//'CF'

1001 Format (lh$,a)

CReturn

End***1

Character*13 Function box(x,y,dx,dy)

Draws a

box dx

wide a. d

dy high centered about

real world coordinate point x,y.

Character esc*l,wcbp*5


Call rc2wc(x-dx/2,y-dy/2,111,J11)

Call rc2wc(x+dx/2,y+dy/2,lur,Jur>

ur=upper right;

11=lower left...

box«esc//'OX'//wcbp(111,Jl 1)//wcbp(1ur,Jur)

Return

End

r***iDraws a

rectangle which Includes the boxes about

grid points from 1gll,Jgll (lower left),

to

1gur,Jgur (upper right)...

Note that the two grid points can

be the same point,

or point In

the same col

or row...

*************************************************************

Character*13 Function rect(1g11,Jgl1,Igur,Jgur )

Character esc*l,wcbp*5,1d*56,pgm*8

Common /gr1dspecs/1d,pgm,ncol,nrow,nz,xo,dx,yo,dy,IproJ,cm,bl


Call corners(Igl1,Jgl1,fwcl11,Jwc111,Iwclur,Jwc1ur)

Cal1 corners(Igur,Jgur,Iwc211,Jwc211,1wc2ur,Jwc2ur)

Box 1

Is the 11

box, box 2

1s the ur...

rect=esc//'OX'//wcbp(1we 111,Jwc111)//wcbp(1wc2ur,Jwc2ur)

Return

Endr***************************************************************

Subroutine rc2wc(x,y,1wc,Jwc)

Converts real

coordinates to world (pixel)

coords

Character 1d*56,pgm*8

Common /gr1dspecs/1d,pgm,nco1,nrow,nz,xo,dx,yo,dy

Common /scalefacts/1wc0,Jwc0,nxp1x,nypix,p1xd1m

Change real

world coordinates to

grid coords...

x1 = (x-xo)/dx

yj=(y-yo)/dy

Change grid coordinates to

world (pixel) coordinates...

1wc=1wc#+n1nt(real(nxp1x)*x1 )

Jwc=Jwc0+n1nt(rea1(nyp1x)*yj)

Return

Endr *** 1

Subroutine corners(1g,Jg,111,Jl1,lur,Jur)

C Finds

corners of

the box

which Is

centered at

grid point (1g,Jg).

C Coords

of the

corners are

returned In

world (pixel)

coordinates...

Common /scalefacts/lwcJ?,Jwc0,nxp1x,nyp1x,p1xd1m

Common /subgrId/lcmln,Icmax,Irmln,1rmax,ncm1n,ncmax,nrm1n,nrmax

1wc»1wcU+( 1g-ncm1n)*nxp1x

Jwc«Jwc0+( Jg-nrm1n)*nyp1x

11l»1wc-nxp1x/2

Jll«Jwc-nyp1x/2

1ur«111+nxp1x-1

Jur«Jll+nyp1x-l

Return

End\+

Subroutine sendcmd(lounlt,cmd)

Character crndM*).cmdstr1ng*200

Common /cmdlength/lengstr

Common /cmdstrIng/cmdstrIng

If (cmd(1:3).NE.'end*) Then

leng*len(cmd)

cmdstr1ng(1engstr+l:lengstr+1eng)*cmd(1:leng)

1engstr=lengstr+leng

End If

If (1engstr.GE.70.0R.cmd<1:3).EQ.'end*) TKen

WrIte (lounlt,'(lx,a )')cmdstr1 ng (

1:lengstr )

lengstr=0

End If

Return

End

C +

C Returns envision command string to set a

color.

C Positive Iclr

values refer to the color scale set by subroutine

C setcolors . . .

C Iclr

=0 Is

background color

« black

C Iclr

=1 thru

13 refers

to color

spectrum set

In sub

setclrsSC

for colors 3

thru 15.

C-£ *********************x****************************************

Character*3 Function colorHclr)

Character esc*l

Parameter (esc = char(27 ) )

CIf

( 1clr.EQ.J0f) Thrn

color»esc//'C

f//char<1char('0*))

Elsecolor»esc//'C*//char(1 char<'0*) + 1c1r + 2)

End If

CReturn

End C +

C clspnt

- Returns the

corner number

(NCORN) and

distance (DMIN)

C of

the corner

In array xpoly.ypoly closest to

theC

point (x,y).

A delta

radius around

each point can

C be

used for

selecting or

rejecting the

corner. ^

C ncorn

- Corner

number of

polygon.C

> 0

- Corner

number of

polygon was

found (within

C radtus used)

C * 0 - Corner number was not found (within radius

C used)

C *-l

- Error, the number of

points of

the polygon

C passed to clspnt was less

than

1.CC

Icon -

Flag controlling which radius criterion to use

C «

1 «

Use DELTA provided by call

to subroutine

C * 0 *

Use the maximum machine value VAXMAX available

CC-CSubroutine clspntlncorn,dmin,x,y,xpoly,ypoly,nbrpts.delta,Icon)

' Dimension xpoly(nbrpts),ypoly(nbrpts)

Parameter (vaxmin=-l.7e+38,vaxmax=l.7e+38)

CIf

(nbrpts.GE.l> Then

ncorn«0

If ( I

con.EG.1) Then

rad

1u

s«

de

lta**2

E

lseradlus-vaxmax

End If

dm1n=vaxmax

CDo

10 1«1,nbrpts

d«(x-xpoly(1>)**2+(y-ypoly(1))**2

If (d.LT.radius.AND.d.LT.dmIn) Then

ncorn*1

dm 1n=d

End If

10 Continue

Elsencorn«-l

End If

CReturn

End

C +V*C

copyspecs

- Copies the gridspecs to gr1dspecs2 common block.

C-

Subroutine copyspecs

Common /grIdspecs/1d,pgm,nc,nr,nz,xo.dx,yo,dy,IproJ,cm,b1

Common /gr1dspecs2/1d2,pgm2,nc2,nr2,nz2,xo2,dx2,yo2,dy2,

Alproj2,cm2,bl2

Character 1d*56,!d2*56,pgm*8,pgm2*8

Cnc2*nc

nr 2 = nrnz2*nz

xo2=xo

dx2=dx

yo2=yo

dy2=dy

iproJ2=1proJ

cmZ-cm

b!2=bl

CReturn

End

C + C

41

cpchars -

Draws a

string of character-prec 1 c 1

son characters (STRG)

at the world coordinates (X,Y).

Author t

Robert W.

Slmpson

Subroutine cpchars( x ,y , s

tr Ing )

Character wcbp*5,ncbp*3 , s

tr 1ng*( * ) , c

md* 90

1x«Jn1nt( x )

1y«Jn1nt(y)

Cal 1

r deb lank (str Ing, s

tr Ing, l

eng)

cmd«'OC' //wcbp( 1x, 1

y)//ncbp( leng ) /

/str Ing ( 1 t

leng)

Call esccom(cmd( 1 : 1

0+leng ) )

Return

End

i***icpcharset -

Sets up

the character-precision character parameters

for the Envision terminal.

See page 7-21

In Envision

reference manual for an explanation of the arguments.

Author: Robert W.

Slmpson

Subroutine cpcharset(1x,1y,zoom,rot,slant)

Character*! zoom,rot,slant

Character wcbp*5,cmd*11

cmd«'0r*//wcbp(1x,1y)//zoom//rot//si ant//*0'

Cal1 esccom(cmd)

Return

End

r***i

cpyply - Allows the copying of a

polygon from one position on

the screen to another position.

r************************************************************

Subroutine cpyply(1 test)

DImensIon vstore(10),xp1y(100),yply(100)

Common /topology/1nfo(100),1 upper(100),1down(100),

&11eft(100),1r1ght(100)

Common /screenloc/ntotal,numply(100),xscr(100,100),yscr(100,100)

Common /box/xmlnbx(103),xmaxbx(100),ym1nbx(100),ymaxbx(100)

Common /1nout/x1n(100,100),y1n(100,100),xout(100,100),

&yout(100,100)


Common /parameter /parm(100,10)


Common /flags/mcf ag,votflg

Common /Junk/ngbtop,jnktop?100),ngbloc,Jnk1oc(100)

Common /zoom/1 zoom,1zva1,nzoom,ncm1nz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)

Common /grldspecs/ Id,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,bl

Common /scale/ xsc,ysc,xstart,ystart,xIn It,yIn It

Common /original/

'//corg , Jwcorg , n

xorgp , n

yorgp

Common /screenbnd/x1eft,xrIght,ybot,ytop

Common /commands/nmax,eps1 In,delIn.delout

Common /max/nptmax

Common /colors/plyclr.black,whIte


Character open*!, sol1d*l,f1ltyp*l,plyc1r*l,black*1,wh1te*l

Character 1d*56,pgm*8,votf1g*2,mcflag*2,mcur*2,ans*2,ans2*2

CCall enhmsg('*** Copy polygon mode *** )

C1test-0

CC -

Test the number of polygons ntotal, exit If

<=0.

CIf

(ntotal.GT.0) Then

CC -

If cursor type has not been selected prompt for type.

CIf

Imcflag.EQ.'N*) Then

Call askmoc(mcur)

If (mcur.EQ.*Q') Then

1test=-l

Elsemcflag=mcur

End If

Elsemcur»mcflag

End If

CC -

Print help

message

CIf

(votf Ig.EQ. 'VMCall hlpcpy


found (1test=l), or user

C wants to quit <1test=-l).

CDo 10

wh11e(1test.EQ.0)

If lag»0


CC -

Initialize the temp arrays.

CCal 1

Inttmp

CC -

Let user pick polygon and return npoly,ncorn,x,y.

CCall pckply(npoly,ncorn,x,y,ans,mcur,lerr)

CC - Ask If

corner point of polygon picked should be used.

CIf

Cans.EG.'Y') Then

nbrpts^numply(npoly)

Cal1 pckpntlncorn.dlst,x,y,ans2.npoly,mcur)

If (ansZ.EO.*Q') Then

1test»-l

Go To 20

End If

CC - Message about repositioning cursor to new location

CCa11 h1pmv2

Call retpnt(xscnew,yscnew,mcur,lerr)

If (lerr.LE.-l> Then

1test=-l

Go To 20

End If

43

If Hzoom.EQ.l) Then

Call 1nvers(xnew,ynew,xscnew,yscnew)

Elsexnew*xscnew

ynew*yscnew

End If

CC -

Find the offset to add to the polygon coordinates (delx,dely)

Cdelx»xnew-x

dely»ynew-y

CC - Store new polygon

Cntemp*nbrpts

Do 30 1*1,ntemp

xtemp(1)=xscr(npoly,1)+de1x

ytempi 1)=yscr(npoly,1)+dely

30

Continue

CC - Test to see If

polygon will be off of

unzoomed grid.

Cxlfunz*xInlt

xrgunz*x1n1t+nc*nxorgp

ybtunz*yIn It

ytpunz

zy1n1t + n

r*nyorgp

Call testoff(xtemp,ytemp,ntemp.xlfunz,xrgunz,ybtunz,

& ytpunz,Intotal>

If (Intotal.LE.0) Then

If (Intotal.EG.0) Call

wrtmsgC' Error, polygon will

& be off of

unzoomed grid')

Go To 20

End If

CC -

Find available polygon position

CCall fndnum(npoly2>

CC - Test polygon In

xtemp,ytemp.

CCall

fndtop(ntop)

Call fndtpl(npoly2,ntop,1test3>

CIf

<1test3.EQ.l) Then

ntotal=ntota1+1

Cal1 stoply(xtemp,ytemp,ntemp,npolyZ,lerr)

Cal1 fndbbxC xml n

,xmax,ym1n,ymax,xtemp,ytemp,

& ntemp,delout)

xmlnbx(npo1y2)=xm1n

xmaxbx(npoly2)=xmax

ym1nbx(npoly2)=ym1n

ymaxbx(npoly2)=ymax

CC - Copy the Inner

and outer bounding polygons offset by the

C appropriate amount.

CDo

90 1»1,ntemp

x1n< npo\y2,1)=x1n(npoly,1)+delx

y1n(npo1y2,1)=y1n(npoly,1 )+de1y

xout(npoly2,l)=xout<npoly,1)+delx

yout(npoly2,1)=yout<npoly,1)+dely

90

Continue

** A A

C - Copy the parameter Information

Do 95 11-1,10

parm(npo1y2,11)*parm(npoly,11 )

95

Continue

If (Izoom.EQ.l) Then

Oo 80 11*1,ntemp

Call trans(xtemp(11),ytemp(11),

&

xtempC11),ytemp(11))

80

Continue

End If

Call setclr(plyc1r)

Call self 11(open)

Cal 1 drwclp(xtemp,ytemp,ntemp,xleft,xrIght,ybot,ytop )

Call setf 1 K

sol Id)

Ca11 newold

ElseCal1 oldnew

End If

1test«l

C20

Continue

If (If l

ag.EG.0) Then

Call setc1r(p1yc1r )

Call self 11(open)

Call drwclp(x1oc,y1oc,nptloc,xleft,xrIght,ybot,ytop)

End If

Else If

(ans.EQ.'NM Then

1test=0

Else1test=-l

End If

Call setf i

Ksol Id)

If (lerr.EQ.-l)1test»-l

Else If

(incur.EQ. 'Q* ) Then

1test=-l

End If

10 End Do

ElseCall wrtmsg('

Sorry, no polygons')

1test=-l

End If

CReturn

End C +\*C

crtgrd

- Prompts the user for Information to construct a

Denver

C standard grid.

(Note: nc*nr<=250000).

C-\«

Subroutine crtgrd(1 test)

Common /gr1dspecs/Id,pgm,nc,nr,nz,xo,dx,yo,dy,1proJ,cm,bl

Character quest*80,1d*56,pgm*8,ans*2

C1d=*

'pgm»'POLYGON

'nc=0

nr=0

nz = lxo=0.0

dx-0.0

yo=0.0

dy=0.0

1proJ=0

cm-0.0bl-0.0

tWrite (6,10)

10 Format (/,'

You will now be asked to enter the grid spec If l

eaf,

4'Ions. ',/,*

(Motet nco1*nrow less

than or

equal to 250,000)',/,

&' enter //

to quit.*,/)

C15

Continue

quest-'

Enter ID

for grid'

1 va1- 1aquest(quest,Id,'(a56)',0)

If (Id.EQ.' *)Go

To 15

If ( I

val.EQ.-l)Go To 100

CC -

Enter the number of

columns Incol)

C1test-0Do

20 whlleMtest.EQ.0. OR. (

nc*nr).GT. 250000)

12 Continue

quest*'

NCOL (//

to quit)'

1 val»11 quest(quest,nc,*(15)*,0)

If (nc.LE.0)Go To 12

If (Ival.GE.0) Then

18 Continue

quest-'

NROW

' 1val = 1

1quest(quest,nr,'(15)',0)

If (nr.LE.0)Go To 18

If (Ival.EQ.-l)1test=-l

If (nc*nr.GT.250000) Then

nc=0

nr=0

Print *,'

Error, grid dimensions too large nc*nr»<250000*

Else1test=l

End If

Else1test=-l

End If

20 End Do


CC -

Enter lower

left corner x-coordlnate of

grid (xo).

Cquest*'

xo*1val =

Irquestlquest.xo,Mel6.8)',0)

If (1va1.EQ.-l)Go To 100

CC -

Enter Interval spacing In

x direction (dx).

Cquest*'

dx'1val»1rqu«st(quest,dx,*(el6.8)',0)

If (Ival.EQ.-l)Go To 100

CC -

Enter lower

left corner y-coordlnate of

grid lyo).

Cquest*'

yo'1val=1rquest(quest,yo,'(e!6.8)',0)

If <1val.EQ.-l)Go To 100

C C -

Enter Interval spacing

1n y

direction (dy).

quest»'

dy'1val = 1

rquest(quest,dy, Mel6.8)',0)


cC - Ask for

dval to Initialize grid to

CC call

askdvlldval,Itest)

C If

(Itest.eq.-l) go to 100

CC -

Initialize grid to user's dval.

CC call

Intgrdldval)

C100

Continue

If ( I

val.EQ.-l)1test«-l

ReturnEnd

C* CC

Curoff - turns graphics cross-hair cursor

off C

1G0

1 -

command to

turn cursor

off. C- C

Subroutine curoff

CCall

esccom<*G0*)

CReturnEnd

C + C C

Curon - turns graphics cross-hair

cursor on.

- command

to turn

cursor on.

**************************

Subroutine curon

CCall

esccom('Gl')

CReturn

End C + CC

defclr - Allows the

changing of

a color

In the

Envision color

C *

table by

specifying the red,

green and

blue components.

CC color

= ASCII

character representing position of

C color

In color

table. See

COLOR.INF or

C DEFCLR.INF

or FNDCLR.INF.

C

'0'-'9', and

' : '-'?' . CC

Ired *

Integer value of

color gun

Intensity, C

Igreen range

Is from

0-15, 0=off,

15=full on.

C Iblue

CC- \*

Subroutine defclr(color,1red,Igreen,1b1ue)

Character color*!, c

redM,cgreen*l, cblue*l,com*5

CCall

fndclr(cred,Ired)

Call fndclr(cgreen,Igreen)

Call fndclr(cblue,Iblue)

Ccom*'Q

1//color//cred//egreen//cblue

Call esccom(com)

47

Return

End C + CC

delloc -

Deletes all

location Information associated with

C polygon npoly.

C-

Subroutlne delloc(npoly,Itest)

Common /parameter/parent 1

00,10)

Common /screenloc/ntotal,nump1y(100),xscr(100,100),yscr(100,100)

Common /box/xmlnbxl100),xmaxbx(100),ymlnbx(100),ymaxbx(100)

Common /1nout/vin(100,100),y1n(100,100),xout(100,100),

&yout(100,100)

Common /Junk/ngbtop,Jnktop(100),ngbloc,Jnkloc(100)

Common /commands/nmax,eps11n,del1n,del out

Common /max/nptmax

CItestM

CC -

Test the Input variables...

CIf

(npoly.GE.1.AND.npoly.LE.nmax) Then

CC - Zero out all!!! of

the coordlntate locations, parms and all

C Internal arrays...

CDo

10 1*1,nptmax

xscr(npoly,1)=0.0

yscr(npoly,1)=0.0

x1n(npoly,1)=0.0

xoutlnpoly,1)=0.0

y1n(npoly,1)=0.0

yout(npoly,1)=0.0

10 Continue

Cnumply(npoly)=0

Cxmlnbxlnpoly)»0.0

xmaxbx(npoly)=0.0

ym1nbx(npoly)=0.0

ymaxbx(npoly)=0.0

CDo 20 J-1,10

parm(npoly,J)*0.0

20

Continue

CJnkloc(ngbloc)*npoly

ElseCall

wrtmsg(' Error

In delloc, npoly out of

range')

1test--l

End If

Return

End C + CC

delply -

Deletes a

polygon from the model.

C-Q *******************************************

Subroutine delp1y(Itest)

Common /pol y 1 o

c/npt loc , x 1 oc ( 100) , y loc ( 100)

*. A Q


" O



Common /calc/ncont,cmin,cde1

Common /zoom/i z

oom,1zva1,nzoom,ncminz(5),ncmaxz(5),nrminz(5),

&nrmaxz(5)Common

/screenbnd/xleft,xr ight,ybot,ytop

Common /colors/piyclr,black,white

Common /f111/open,sol id,fi1typ

CCharacter open*!,sol1d*l,fiItypM,piyclr*l,black*!,white*!,color

&*!Character votflg*2,ans*2,mcflag*2,mcur*2

CIf

(ntotal.GT.0) Then

CC -

Print enhanced message.

CCall

enhmsgl'*** Delete

polygon mode

****) ltest-1 npoly

s0

CC -

Print help

message if

user wants verbose answers.

CIf

(votfIg.EQ.'V)Call hlpdel

CC -

Let user

pick polygon;

return npoly,ncorn,x,y.

C10

Continue

Call intply

Call pckplylnpoly,ncorn,x,y,ans,mcflag,ierr)

If (ans.EQ.'N')Go To

10 If

(ans.EQ.'Q')Go To

100 CC

- Now

that we are

certain about which polygon will

be C

deleted, decrement the

polygon counters and

Increment C

the garbage collection pointers (ngbtop,ngbloc).

Cntota1»ntota1 -1

If (ntotal.LT.0)ntotal=0

ngbtop=ngbtop+1

ngbloc=ngbloc+l

CC -

Physically delete (set

to zero)

all reference pointers from

C the topology array (deltpl)

and all

location coordinate

C arrays

(delloc). C

itest-1Call

deltpKnpoly, Itest)

If (Itest.EG.1)

Then Call

setclr(black)

Cal1 newold

Elsentotal-ntotal+1

ngbloc*ngbloc-l

ngbtop»ngbtop-1

Call setclrfplyclr)

Call o1d n ew

End If

CC -

Now either

undraw the

polygon (setclr(black))

if topology

C deletion was

succeeded, or

redraw the

polygon (setc1r(piyclr))

C if

deletion failed.

C » ^

Call setfll(open)

**' 49

Cal1 drwclplx1oc,yloc,nptloc,xleft,xright,ybot,ytop)

Call setclr(plyclr)

Call setf11(sol Id)

CC -

Delete the

location Info

for npoly 1f

topology deletion succeeded.

CIf

(npo1y.GT.0.AND.Itest.GE.1) Then

Call del1oc(npo1y,Itest)

If (ntotal.EQ.0)Cal1 wrtmsg(**** No

more polygons ***»)

End If

100 Continue

Elsentotal«0

Call wrtmsg( '

Polygon list

emtpy, (I.e.,

No polygons)')

End If

CReturn End

C +

C delpnt - Allows the deleting of

Individual point of

a polygon.

C-

Subroutlne delpnt*Itest)

Dimension xply(100),yp1y(100)

Common /topology/1nf o(100),1 u

pper(100),1down(100),

&11eft(100),1r1ght<100)






Common /Junk/ngbtop,Jnktop(100),ngbloc,Jnk1oc(100)

Common /zoom/Izoom,Izval,nzoom,ncm1nz(5),ncmaxz(5),nnrm1nz(5),

&nrmaxz(5)

Common /screenbnd/xleft,xrIght,ybot,ytop

Common /commands/nmax,eps1 In,del1n,del out

Common /colors/plyc1r,b1ack,wh1te


Character open*I,solIdM,f1ItypM,p1yclr*l,black*l,wh1te*l

Character votf1g*2,mcflag*2,mcur*2,ans*2,ans2*2

CCall

enhmsg('*** Delete point mode

***') C

1test«0If

(ntotal.GT.0) Then

CC -

If cursor

type has

not been

selected prompt for

type. C


Call askmoc(mcur)

If (mcur.EQ.'Q'>

Then1test--l

Elsemcflag*mcur

End If

Elsemcur=mcf1ag

End If

If (votfIg.EQ.'V)Cal1 hlpdpt

CC -

Start looping

until polygon Is

found (1test=l),

or user

C wants

to quit

(1test*-l).C

«w C f\

Do 10

whl le( Itest.EQ.0) ;.

3 \J

1flag=0

If1ag2-0

If (mcur.EQ.'M*.OR.incur.EQ.'C') Then

CC -


CCall inttmp

CC -

Let user pick polygon, return npoly,ncorn,x,y.

CCal1 pckply(npoly,ncorn,x,y,ans,mcur,lerr)

CC - Ask If

corner of

polygon picked should be used.

CIf

(ans.EQ.'V) Then

nbrpts*numply(npoly)

If (nbrpts.EQ.3) Then

Call wrtmsgl' Sorry, can''t delete a

point, polygon

& only has three corners.')

ans2*'Q'

1test=-l

ElseCall askpnt(ans2)

If (am :.EQ. *N' )

Then

Cal1 msgspt

Call retpnt(x,y,mcur,1err2)

If (Izoom.EQ.1)Ca11 Inverslx,y,x,y)

End If

End If

CIf

(1err2.LE.-1.0R.ans2.EQ.'Q') Then

1test=-l

Go To 20

End If

CDo 35

' *! ,nbrpts

xplyl1)*xscr(npoly,1)

yply(1)*yscr(npoly,!)

35 Continue

1con=lCal1 clspnt(ncorn,d1st,x,y,xp!y,yply,nbrpts,delout,Icon)

If (ncorn.EQ.0.0R.1err2.LT.0) Then

1test=-l

Go To 20

End If


Cnpnt»«nbrpts-l

ntemp«npnts

If (ncorn.EQ.l) Then

Do 30

1*1,npnts

xtemp(1)=xscr(npoly,1 + 1 )

ytemp(1)*yscr{npoly,1 + 1 )

30 Continue

, Else If

(ncorn.EQ.nbrpts) Then

Do 40

J=l ,npnts

xtempiJ)=xscr(npoly,J)

ytemp(J)eyscr(npoly,J)

40

Continue

ElseDo

50 k=l,ncorn-l

xtemp(k)=xscr(npoly,k)

ytemp(k)*yscr(npoly,k)

50

Continue

Do 60 1-ncorn*1,nbrpts

xtemp(1-1)=xscr(npoly,1>

ytemp(1-1)=yscr(npo1y,1 )

60

Continue

End If

- Now

undraw the

connecting lines

to ncorn.

If (ncorn.EQ.l)

Thenxl*xscr(npoly.nbrpts)

yl«yscr(npoly,nbrpts)

x3*xscr(npoly,2)

y3=yscr(npo1y,2)

Else If

(ncorn.EQ.nbrpts) Then

xl*=xscr(npoly,nbrpts-l )

yl*yscr(npoly,nbrpts-1>

x3«xscr(npoly,1)

y3=yscr(npoly,1)

Elsexl«xscr(npoly,ncorn-1)

yl«yscr(npoly,ncorn-1)

x3*xscr(npo1y,ncorn+l )

y3ayscr(npoly,ncorn+1 )

End If

x2«xscr(npoly,ncorn)

y2=yscr(npoly,ncorn)

If (Izoom.EQ.1> Then

Call trans(xl,yl,xl,yl)

Call trans(x2,y2,x2,y2>

Call trans<x3,y3,x3,y3 )

End If

Call setclr(black)

Call drwl1n(xl,yl,x2,y2)

Call drwl1n(x2,y2,x3,y3>

Call setclr(white)

Call drw!1n(xl,yl,x3,y3)

- Test

the new

polygon

In the

xtemp,ytemp array to

see 1f

1t Is

self-cross 1ng.

Ca11 selftest?If1ag3,nsIdel,ns1de2,xtemp,ytemp,ntemp)

If (1f 1

ag3.EQ.-l> Then

Call wrtmsgt' Error, polygon

Is self-cross 1ng')

If1ag2=lGo

To 20

End If

- Test

the new

polygon 1n

the xtemp,ytemp array and

fit Into


Call testopo(npoly,1test2>

If (1test2.GE.0> Then

If lag=l

ElseIf 1

ag2 = l

End If

1test=l

20

Cont1nue

If ( I

f1ag.EQ.0> Then

Call setclr(p1yc1r)

Call setflKopen)

52

Cal1 drwdp(xloc,yloc,nptloc,xleft,xr1ght, ybot,ytop)

If (IflagZ.eq.1) Then

Call setclr(black)

Call drwl1n(xl,yl,x3,y3)

Call setclr(plyclr)

Call setflKsolld)

End If

End If

Else If

(ans.EQ.'N') Then

1test=0

Else1test*-l

End If

Call setftl(solld)

If <terr.EQ.-l)1test»-l

Else If

(incur .EQ. *Q* ) Then

1test=-l

End If

10 End Do

ElseCall

wrtmsg(*

Sorry, no

polygons')

1test=-l

End If

CReturn

End

C +\*C

deltpl

- Deletes a

node (polygon npoly) from the topology

C structure 1n

the newtopo common blocks, and makes

C connecting links

for the remaining nodes.

C-\*

Subroutine deltpl(npoly,1 test)

Common /newtopo/1nfnewt 100),1upnew(100),1dwnew(100),

&11fnew(100),1rtnew(100)

Common /commands/nm^x,eps11n,delIn,del out


CC -

Test to

make sure that npoly 1s

within range.

CIf


1flag-0

If ( 1

test.EQ.2Hf lag=l

CC -

Find the position (ndpstn) of

the polygon (npoly)

In the

C tree (topology).

Abort and give user

message If

not

C found, this means something Is

screwed up

In the array

C Infnew (or

entire

t pology array).

CCall

fndply(ndpstn,npoly)

If (ndpstn.LE.0) Then

Print *,'

N^pstn =',ndpstn

1test*-l

Call wrtmsg(' You have big problems')

Go To 100

End If

1test=l CC

- Initialize the neighbor pointers of

polygon npoly.

Clup

851 upnewt ndpstn )

1dwn= 1dwnew( ndpstn)

* » S

)lft=1Ifnew(ndpstn)

*' ^

Irgt*51rtnew(ndpstn)

CC -

Determine If

the given polygon npoly 1s

a left

node of

the

C tree (lft=0).

If lft«0,

then test

to see

If there

Is a

C replacement polygon, first look

down (Idwn),

If this

Is zero,

C then

look to

the right (Irgt).

If Irgt

Is also

zero this

C means that

there Is

no replacement polygon Mrep)

CIf

(lft.EQ.0) Then

1rep=0If

(ldwn.GT.0)1rep»1dwn

CIf

(lrep.GT.0) Then

If (1up.GT.0)1dwnew(1up)=1rep

11fnew(Irep)»#

1 temp581 rep

20 Continue

1upnewl1 temp)»1 up 1 last*1 temp 1temp«1rtnew(Itemp)

If <Itemp.GT.0)Go To

20 1rtnew(1last)=1rgt

If ( 1rgt.GT.J0T) 11fnew( 1rgt)*1 last

1test*l C

Else If

(Irep.EQ.F) Then

If ( 1rgt.GT.0>

Then If

(1up.GT.0) Then

1dwnew(1up)*1rgt

1 Ifnew(1rgt)=0

1test=lElse

If (lup.EQ.0)

Then 1 Ifnewt1rgt)=0

1test=l Else1test=-l

Call wrtmsg('

Problem with

lup') End

IfElse If

(1rgt.EQ.0> Then

If ( 1

up.GT.0) Then

1dwnew(1 up)=0

1test=l

Else If

( 1up.EQ.0) Then

Ite.t=l

If (1flag.EQ.0)Cal1 wrtmsg(

4

*** No more Polygons ***')

Else1tesi=-l

Call wrtmsgC' Problem with lupM

End If

Else1test«-lCall

wrtmsg(' Problem with IrgtM

End If

Else1test« -1Call wrtmsg(' Problem with Irep')

End If

CC -

If the given polygon npoly Is

not a

left node (I.e. lft.ne.0)

C test for a

replacement polygon (Irep) by first looking down.

CElse If

(lft.GT.J0T) Then

1 rep=J0"

If I1dwn.GT.0)Irep-ldwn

If (1rep.GT.0) Then

llfnew(1rep)=lft

1rtnew(lft)«1rep

1temp«Irep

30

Continue

1upnew(Itemp)«1up

1last«1temp

1temp«1rtnew(Itemp)

If (Itemp.GT.0)Go To 30

1rtnew(1last)=1rgt

If (1rgt.GT.0>11fnew(1rgt)»1last

1test=lElse If

(Irep.EG.0) Then

1rtnew(lft)=1rgt

If (1rgt.GT.0)11fnew(1rgt)-lft

Itesfl

Else1test«-l

Call wrtmsg(' Problem with Irep')

End If

Else1test=-lCall

wrtmsg(' Problem with 1ft')

End If

CC - Zero out the deleted polygon's structure from the tree and

C add the deleted position (ndpstn) to

the garbage table at

C position Igarb.

CIf

(1test.GE.0) Then

1nfnew(ndpstn)-0

1upnew(ndpstn)=0

1dwnew(ndpstn )=0

1 Ifnew(ndpstn)=0

1rtnew(ndpstn)=0

CJnktop(ngbtop)=ndpstn

End IF

C100

Continue

ElseCall

wrtmsg(' Error

In DELTPL, npoly not

In range

& l=<npoly=<nmax')

1test=-l

End If

CReturn

End

C +£

**************************************************************

C dlspla -

Selects the drawing, erase, and

redraw modes

C (default-122).

For Envision model 230 only.

C-£ **************************************************************

Subroutine dlspla

CCall

esccom('OG122')

CReturn

End

C drawwalk

- Walks the topology structure (tree)

and clips and

C draws the polygon encountered

C-£ *****************************************

Subroutine drawwalk

Dimension xpoly(100),ypoly(100)

Common /screenloc/ntotal,numplyl100), xscrI 100,100),yscr(100,100)

Common /topology/Info(100),1 upper(100),1down(100),11eft(100),

&1r1ght<100)

Common /screenbnd/xleft,xr1ght, ybot,ytop

Common /zoom/1 zoom,1 zval,nzoom,ncm1nz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)

CCall fndtoplntop)

If (ntop.GE.l) Then

Cnext*ntop

ngon*ntop

1test=0

CDo 10

whllelltest.EQ.0)

npoly*Info(next)

If (npoly.GE.l) Then

nbrpts»numply(npoly)

If (nbrpts.GT.0) Then


Do 20 1=1,nbrpts

Call trans(xpolyH) ,ypol y( 1 ) ,

xscr(npoly, 1) ,

&

yscr(npoly,1))

20

Continue

ElseDo 25 j«l ,

nbrpts

xpolylj)=xscr(npoly,j)

ypoly(J)*yscr(npoly,J)

25

Continue

End If

Cal1 drwclplxpoly,ypoly,nbrpts,xleft,xrIght,ybot,ytop)

If (ltest2.GE.0) Then

Call walk(next,ngon,1test3)

If (next.GE.1) Then

ngon=next

Else If

<next.EQ.0.0R.1test3.EQ.0) Then

ltest=l Else If

<next.LT.0.0R.1test3.EQ.-l) Then

Print *,'

Error

1n walking tree at

pos11Ion *,ngon

1test=-l

End If

End If

Else1t«st»-l

End If

ElsePrint *,*

Error, npoly out of range'

1test»-l

End If

10 End

Do Else

Print *,'

Error ntop not found or

out of

range' End If

CReturn

. ^

*********************** *************************************

"" 56

C drwbox

- DRaW BoX

- Draw a

box with the boundaries determined

C by the world coordinate pair (x0,y0) and (xl,yl).

C-£ *************************************************************

Subroutine drwboxC xJ0, ySf , xl ,yl )

Character com*! 2 ,

wcbp*5

C

1xl*Jn1nt(xl

1yl»Jn1nt(yl )

com='OX* //wcbp( IxflT, 1

y0)//wcbp< 1x1 , lyl

Cal 1 esccom( com)

CReturn

End C +wC

drwclp -

DRaW Clipped Polygon

- Clips and draws the polygon

C xpoly,ypoly on

the Envision terminal.

C-CSubrout Ine

drwc lp( x

poly , ypol y , n

brpts , x left , xr Ight , y

bot , y

top)

D Imens Ion xpo1y(nbrpts),ypo1y(nbrpts)

CDo

18 1*1 , n

brpts

If ( 1 .EG. n

brpts) Then

xl=xpoly( 1 )

y 1 =ypol y ( 1 ) x2=xpoly( 1 )

y2=ypoly ( 1 )

Elsexl=xpoly ( 1 )

yl=ypoly( 1 )

x2=xpoly( 1+1 )

y2=ypoly( 1+1 )

End If

CCal 1

tstend( Inout , xl fyl ,

x2,y2,xleft,xr1ght , y

bot , y

top )

CIf

(1nout.EQ.3) Then

Call drwl 1n(xl ,yl ,x2,y2)

Else If

(Inout. EQ. 2) Then

Cal 1 cl 1p per ( x

one,yone,xl ,yl,x2,y2,xleft,xr1ght,

& ybot, y

top)

Call drwl 1n( xone, y

one,x2 ,y2 )

Else If

( Inout. EQ. 1 ) Then

Cal 1 cl Ipper { x

two, ytwo, x2 ,y2 ,xl ,yl ,

xleft,xr Ight,

& ybot, y

top)

Call drwl 1n(xl ,yl , xtwo, ytwo)

Else If

( Inout. EQ.0) Then

Cal 1 cl Ipper { xone, yone, x

l,yl,x2,y2,xleft,xr1ght,

& ybot, y

top)

Cal 1 cl Ipper ( xtwo, ytwo, x

2,y2,xl ,yl ,x left , xr Ight ,

& ybot, y

top)

Call drwl 1 n ( x

one , yone, x

two , y

two )

End If

IF Continue

CReturn

Endc+

* c 7

r *************************************************************

^J fC

drwl In -

Draw a

line connecting the world coordinates (x0,y0)

C and

( xl ,yl ) .

c-cSubroutine drwl1n{x0,y0,x1,y1)

Character com*12 ,wcbp*5

C1

xJe

r»Jn

1n

t(xF

)1y0=

Jn1nt(y

0)

1xi=Jn1nt(xl)

1yl=Jn1nt(yl)

Ccom«'OV'//wcbp(1x0,1y0)//wcbp(1x1,lyl)

Call esccom(com)

CReturn

End

C + CC

drwpln -

DRaW Poly LINe -

Draws a

polyline figure connecting

C world coordinates (xpts,ypts)

In the order passed to

C drwpln.

See the Envision reference manual or

drw-

C pln.lnf for details.

C-

Subroutine drwpln(xpts,ypts,nbrpts )

Dimension xpts(nbrpts),ypts<nbrpts)

Character esc*1,ncbp*3,wcbp*5

Cesc*char(27)

Print *,esc,'Om ',ncbp(nbrpts),(wcbp(Jn1nt(xpts(1)),

&Jn1nt(ypts(1 ) ) > , 1 = 1

.nbrpts)

CReturn

End

C + \*C

drwply -

Draws a polygon on the Envision terminal.

Connects

CC xpts.ypts

- Array containing the world coordinates

C of polygon vertices.

CC nbrpts

- Number of vertices In

xpts,ypts.

C-

\*

Subroutine drwply{xpts,ypts,nbrpts)

DImensIon xpts(nbrpts),ypts(nbrpts)

Character esc*1,ncbp*3,wcbp*5

Cesc=char(27)

Print *,esc, 'OM*,ncbpCnbrpts),(wcbp(Jn1nt(xpts( 1 ) ) ,

«,Jn1nt(ypts( 1))),1»1, nbrpts)

CReturn

End

C + CC

- drwpnt -

DRaW PoINT -

Draw a

point at world coordinates

C <x0,y0).

C-

£ *************************************************************

Subroutine drwpnt(x0,

Character com*7,wcbp*5

C1x0=

Jn1nt(x

0)

1yj0

f»jn

1nt(y

flf>

58

com-'OO'//wcbp(1x*.ty0>

Call esccom(com)

CReturn

End C + CC

edtply -

EDIT PoLY

- Driver

for Edit

polygon mode.

C Options are*

CC a

» Add

points

C d

» Delete a

point

C m

* Move a

point

C '

h »

HelpC

q » Quit

and return

to Polygon mode

C C-\*

Subroutine edtp1y(1 test)


CCall

enhmsgt'*** Edit

polygon mode

*** ) C

!test-0 ans*'h' Do

10 whlleCltest.EQ.0)

quest3

' Edit

polygon mode (a/d/m/h/q)'

1va1=1aquest(quest,ans,'(a2 )*,2)

CIf

(ans.EQ.'A*.OR.ans.EQ.'a*) Then

Call addpntllerror)

Else If

(ans.EQ.'M'.OR.ans.EQ.'m*) Then

Call movpnt(1 error)

Else If

(ans.EQ.*D'.OR.ans.EQ.'d*) Then

Call delpnt(lerror)

Else If

(ans.EQ.'H'.OR.ans.EQ.*h') Then

Call hlpedt

Else If

(ans.EQ.'Q'.OR.Ival.EQ.-l.OR.ans.EQ.'q') Then

1test=l

ElseCal1 errmsg

End If

C If

<lerror.eq.-l )

1test»-l

ans='q'

10 End Do

CReturn

End

C +

C enhmsg -

Displays enhanced message at user's terminal.

C-

Subroutlne enhmsg(text)

Character text*(*>,black*l,white*!

Cwh!te='1'black='0'Call

envbcl(whlte)

Call wrtmsg(text)

Call envbcl(black)

CReturn

End

o

cC entmou -

Enables the mouse, draws polygon as

user enters It,

C and returns polygon coordinates via

xscrn,yscrn.

C-CSubroutine entmou(xscrn,yscrn,nbrpts,Itest)

D linens Ion xscrn( If if) ,yscrnt 100)

Character ans*2

CCall curon

Call softkyt'l')

Cal1 setmou

Cal1 loadmou

nbrpts*0

1test»0

1-0If

(Itest.EG.0) Then

10 Continue

Call getmou(mode,1x,1y)

x-float(1x)

y-float(1y)

If (mode.EO.1.OR.mode,EG.2) Then

If (1.EQ.99.AND.mode.EO.l) Then

Print *,

& ' Last point, only button 2

or buttons 2&3

allowed*

Else1»1 + 1xscrn(1 )s

xyscrn(1 )=y

Call drwpnt(x,y)

If ( (1 .GT.l > .AND. ( 1 .IE. 1

00» Then

If {( 1 .

E0.2).AND.(mode.EQ.2» Then

Call asktwz(ans)

If (ans.EQ.'Q') Then

nbrpts=1

1test=-l

Elsemode=l

End If

End If

If (Itest.EQ.0) Then

Cal1 drwl1n(xscrn(1-1),yscrn(1-1),xscrn(1),yscrn(1

& ))If

(mode.EQ.2) Then

Call drwl1n{xscrnU),yscrnM),xscrn(l),yscrn(l)

& )nbrpts=1

1test=l End If

End If

End If

End If

CElse If

(mode.E0.3) Then

Call hlpmou

CElse If

lmode.EQ.23) Then

nbrpts*1

1test=-l C

ElseCall

errmsg

60

End If

If (1.EQ.99.AND.ltest.EQ.0) Then

Print *,*

99 coordinates entered, only one more allowed*

End If

If < 1 .GT. 100) 1tes,t--l

If (Itest.EG.0)Go To 10

End If

CCall

softkyC**)

Call curoff

Return

End

C +V*C

entply -

Enables cursor keys,

draws polygon as

user enters It,

C and returns coordinates via

xscrn,yscrn.

C-V*

Subroutine entply(xscrn,yscrn,nbrpts,itest)

Dimension xscrn( \418) ,yscrn( 100)

Character ans*l,ansl*l

CCal1

curon

nbrpts=0

1test=0

1=0If

( itest.EQ.0) Then

10 Continue

Call gtpnt(ans,x,y)

If (ans.EG.'e'.OR.ans.EG.'f«) Then

If ( 1 .

EG.99.AND.ans.EG.*e') Then

Print *,'

Last point, only (f/q)

allowed

1 Else1-1 + 1xscrn( 1 ) = x

yscrn( 1 )

=y

Ca11 drwpntt x,y)

If ((1.GT.1).AND.(1.LE.100)) Then

If ((1.EQ.2).AND.(ans.EQ.'f')) Then

Call asktwz(ansl)

ans=ans1

If (ans.EQ.'q') Then

nbrpts=1

1test=-l

End If

End If


Call drwl1n(xscrn(1-l),yscrn{1-l),xscrn(1),yscrn(1

& ))If

(ans.EQ.'f') Then

Call drw11n(xscrnU),yscrn(i),xscrn(l),yscrn(l)

& )nbrpts=1

1test=l End

If End

If End

If End If

CElse If

{ans.EQ.'h') Then

Cal1 hlpent

CElse If

(ans.EQ.'q*) Then

nbrpts=1

1test=-l

CElseCal1 errmsg

CEnd If

If (1.EQ.99.AND.1test.EQ.0> Then

Print *,'

99 coordinates entered, only one more allowed*

End If

If (1.GT.10F)!test--l


End If

CCall curoff

Return

End

C*

\*C envbcl -

Sets the alphanumeric display background color.

CC See ENVBCL.INF and/or the Envision reference manual.

C-£ ********** ***********: i

Subroutine envbcl(color)

Character com*2,color * 1

Ccom*'b

f//color

Cal1 esccom(com)

CReturn

End

C+

CC envclr

- Automatically loads In

the Envslon terminal and picks

C up

to 13

colors

1n a

spectral color sequence.

I=wh1te,

C 2*green, 3-ncolors=spectrurn, rest=black.

Color spectrum

C Is

left Justified at 1clr=3 If

nsh1t=0.

CC Author: Robert Slmpson

C-

£ **************************************************************

Subroutine envclrtloun1t,ncolors,nsh1ft)

Character color*1,v2c*1

Integer 1r(0:l5),1g(0:l5),1b<0:l5)

Parameter (nmax=14)

Integer 1rd(0:15),1gr<0:15),1bl<0:15)

Data 1rd/00,09,07,00,00,00,00,11,15,15,15,15,15,15,15,157

Data lgr/00.00,00,00,10,13,14,15,15,12,09,07,00,00,00,15/

Data 1b1/00,09,11,15,14,10,06,00,00,00,00,00,00,12,15,15/

Cncolors*max(2,ncolors)

ncolors=m1n(13,ncolors)

nsh1ft=max(0,nsh1ft)

nsh1ft=m1n(13-ncolors,nsh1ft)

CC Set al1

black...

CDo 20 1=0,15

1r(1)=0

1g(1 )=01b(1 )

=0

20 Continue

C C Set 1=

white

62

1g( 1 ) = 151b( 1 )«15

CC Set 2 =

cursor green...

C1r<2)»0

1g<2>=!5

1b(2)=0

CC Fill ncolors Into 3

thru ncolors+2 by Interpolating In

spectrum of 14...

CDo 40 1=1, n

colors

clr=Real H-l)*Real

( nmax- 1 ) /

Rea 1

( ncolors-1 )+ 1 .0

Do 40 J-l ,

nmax-l

If (clr.GE.Real

( J ) . AND . cl r .LE .

Rea 1

<J+1)> Then

1r(f + 2 + nsh1ft)-Jr!nt((lrd(J+l)-1rd(J) )*(clr-Real

< J) ) + 1rd( J) ) 1g(1 + 2 + n

sh1ft) = J

n1nt( ( 1gr( J + l )

-1gr( J) )

*(clr-Real

( J» + 1gr( J) )

1b(H-2 + n

sh1ft)*Jn1nt(<1bl(J-U)-1bl(J) )*(clr-Real {J))+1bl(J»

End If

40 Continue

CC Enhance yellow...

CDo 50

1 *3, ncolors+2

If Ub( 1 )

.EQ.0.AND. 1g(1 )

.GE.14.AND. 1r( 1 J

.GE.12) Then

1r( 1 )«15

1g( 1 ) = 15End If

50 Continue

CC Write color spec+.-um...

CDo 70 1clr=0,15

Call fndcl r { c

olor , I

clr )

Call defclrtcolor , 1

r(1clr),1g(1clr),1b(1clr))

70 Continue

CReturn

End

C +V*C

errmod

- Prints error message at user's terminal

1f output file

C 1s

requested before other conditions are satisfied.

C-

V*

Subroutine errmod

CWrite (6,10)

10 Format (/,'

Error output files can not be generated until',

&' model file Is

created',/)

CReturn

End

C + CC

errmsg -

Prints message at user's terminal

1f a wrong answer

C Is

entered.

C-

Subroutine errmsg

Write (6,10)

* _^

^

10 Format (/,'

Wrong answer...try again')

CReturn

End

C + CC

esccom - Sends the character string 'com'

to the Envision terminal.

C-\+

Subroutine esccom(com)

CharacterM*) com,esc*l


C1leng=1en(com)

Write (6,20)esc//com

20 Format (x,a<1leng+1»

CReturn

End

C +V*C

fndbbx

- Finds the bounding box around the polygon passed

1n C

the arrays xpoly,ypoly.

Adds a boundary (delta)

C to

the boundary xmln,xmax,ym1n,ymax returned.

C-Q *********************** *************************************

Subroutine fndbbx(xmln ,xmax,ym1n,ymax,xpoly,ypo1y,nbrpts,delta)

D1mensIon xpoly(nbrpts),ypoly(nbrpts)

Cdelta*abs(delta)

CC -

Initialize the maximum and minimum values of

xmln,xmax,

C ymIn,ymax.

Cxm1n*xpoly(1)

xmaxsxpo1y(1)

ym1n*ypoly(1)

ymax=ypoly(1)

CC -

Go through the set of

points defining the polygon and

C find the smallest

?vxm1n,ym1n) and largest (ym1n,ymax).

CDo

10 1*1,nbrpts

xm1n=amlnl(xpo1y(1),xm1n)

xmaxsamaxl(xpoly(1),xmax)

ym1n=am1nl(ypo1y(1),ym1n)

ymax=amaxl(ypoly(1),ymax)

10 Continue

CC - Test the boundary limits for over/under flow when the

C epsllon (delta)

Is added/subtracted.

Cxm1n*xm1n-delta

xmax=xmax+delta

ym1n=ym1n-delta

ymax^ymax+delta

CReturn

End OC

fndbpl

- Finds an

Inner and outer bounding polygon around poly-

w» O4

C gon npoly.

C-

Subroutine fndbpl(npoly,1 test)

Common /screenloc/ntota1,numply(100),xscr(100,100),yscr{100,100)

Common /1nout/x1n(100,100),y1n<100,100),xout(100,100),

& yout(100,100)

Common /commands/nmax,eps11n,de11n,delout

Dlmens ion

xlntmpt100),y1ntmp(100),xoutmp(100),youtmp(100),

& xpoly(100),ypoly(100)

C1test-0

nbrpts-nump1y(npoly)

If (nbrpts.LE.2) Then

1test=-l

ElseDo 5

11*1 ,nbrpts

xpo!y(11)*xscr(npoly,11)

ypo!y(11)*yscr(npoly,11 )

5 Continue

CCall boundpoly(1 test,x1ntmp,y1ntmp,xoutmp,youtmp,xpoly,

& ypoly,nbrpts,del1n,delout)


Do 10

1*1,nbrpts

x1n(npoly,1) = x

1ntmp(1 )

y1n(npoly,1)*y1ntmp(1 )

xout(npoly,1) = x

outmp( 1 )

yout(npoly,1) = y

outmp( 1 )

10 Continue

End If

End If

CReturn

End

C +l#C

fndcde -

FIND CoDE

- Returns the code for the region, ex-

C pressed as Iblt4,1b1t3,1b1t2,1b1tl, of the screen

C location (x,y).

See Figure 5-5, p.66, "Principles

C of Interactive Computer Graphics", by Newman and

C Sproull, 1979.

CC Ibltl

- 1,

If x

< xleft

C 1b1t2 =1,

If x

> xrlght

C 1b1t3 «

1, If

y <

ybot

C 1b1t4 =

1, If

y >

ytop

CC-£ ******************** .A**************************************

Subroutine fndcde(1b1t4,Ibl13,fbltZ,Ibltl,x,y,xleft,xrIght,

&ybot,ytop)

C1b1t4-0

1b1t3*0

1b1t2*0

1b1tl=0

CIf

(x.LT.xleft) Then

1b1tl=l

Else If

(x.GT.xrIght) Then

1b1t2-l

End If

C .

, _

If (y.LT.ybot) Then

6 J

1b1t3-l

Else If

(y.GT.ytop) Then

1b1t4-lEnd If

CReturn

End

C +£ **************************************************************

C fndclr

- Converts a

numeric code for

color In

the color table

C Into

the equivalent ASCII (hexadecimal) code for

the

C Envision terminal.

See also COLOR.INF, or

FNDCLR.INF.

CC ncolor -

Position number of

color

In color table 0-15.

C «

0 - usually black

C "

1-15 - Same as

color mapping I-'?*,

see

C Envision reference manual.

C color

- Ascll code (al)

for color

In color table

C *

'0'-'9',':'- ?'.

C »

'0', If

ncolor<0 or

ncolor>15, an

error

C message Is

printed.

C-£ **************************************************************

Subroutine fndcIr(color,ncolor)

Character color*!

CIf

(ncolor.GE.0.AND.ncolor.LE.15) Then

co1 or*char(ncolor+1 char('0'))

Elsecolor-'0'

Call wrtmsg(' Error, value past to FNDCLR out of

range.')

End If

CReturn

End

C +£ *************************************************************

C fndnod -

FIND NODe -

Finds the currently available node In

C the tree.

Starts with Jnktop arrays and then scans

C through the topology arrays.

If all

nodes have been

C used ndpstn=0.

CC ndpstn «

node position

C *

1 to

max

C »

0 no

more nodes

C »-l

error condition

CC-£ **************************************************************

Subroutine fndnod(ndpstn )

Common /topology/Info(100),1 upper(100),1down(100),

&1left(100),1 right?100)

Common /screenloc/ntota1,nump1y(100),xscr(100,100),yscr(100,100)

Common /commands/nmax,eps1 In,del1n,del out

Common /Junk/ngbtop,Jnktop(100).ngbloc,Jnkloc(100)

C1test-0

5 Continue

ndpstn-0

If (ntotal.GE.0.AND.ntotal.LE.nmax) Then

If (ntotal.EG.nmax) Then

Print *,'

Polygon list

full, only',nmax,'polygons allowed'

If (ngbtop.GT.0) Then

** DO

ndpstn

3Jnktop(ngbtop)

JnktopCngbtop >-0

ngbtop=ngbtop-1

Else If

(ngbtop.EQ.0) Then

1-1Do 10 whl1e(ndpstn.EQ.0)

If < 1

nfo(1J.LE.0) Then

ndpstn*1

Else1 = 1 + 1

End If

If ( 1 .

GT.nmax)ndpstn*-l

10

End Do

Elseltest-ltest+1

ngbtops0

Do 20 J«l,nmax

If (Jnktopt J).GT.0)ngbtop = n

gbtop+1

20

Continue

If (Itest.EQ.1> Then

Call wrtmsg(' Error In

ngbtop, recovery attempted')

Else If

(ltest.GE.2) Then

ndpstn=-1

Call wrtmsg(' Recovery attempt failed')

End If

End If

End If

Elsendpstn*-!

Call wrtmsg(' Error

In ntotal, out of range')

End If

If (Itest.EQ.1)Go To 5

CReturn

End

C +

C fndnum -

Finds the next available polygon position number.

C Starts with the Jnkloc arrays and then scans the

C numply (NUMBER points

In POLYGON) array for an open

C position (I.e. nump1y(npoly)

S0).

CC npoly =

Number of polygon position

C *

1 to nmax

C *

0 no more polygons spaces

C a-\

error condition

C-

Subroutlne fndnum(npoly)


Common /commands/nmax,eps1 In,del In,delout

Common /junk/ngbtop

;Jnktop(100),ngbloc,Jnkloc(100)

C1test-0

5 Continue

npoly=0

If (ntotal.GE.0.AND.ntotal.LE.nmax) Then

If (ntotal.EQ.nmax) Then

Print *,' Polygon list full, on 1y',nmax,*polygons allowed*

ElseIf

(ngbloc.GT.0) Then

npoly*Jnklocingbloc)

Jnkloc(nqbloc)

S0

ngblocT.j-jbloc-1

Else If

(ngbloc.EG.0) Then

1 = 1Do 10

wh11e(npoly.EQ.0)

If <numply(1).LE.0) Then

npoly-1

Else1-1 + 1

End If

If (1.GT.nmax)npoly--1

10 End Do

Else1test«1test+l

ngbloc-0

Do 20 J-l,nmax

If (Jnkloc(J).GT.0)ngbloc»ngbloc+l

20

Continue


Call wrtmsgl*

Error

In ngbloc, recovery attempted*)

Else If

(1test.GE.2) Then

npolya-l

Call wrtmsgC*

Recovery attempt failed*)

End If

End If

End If

Elsenpoly=-l

Call wrtmsgl*

Error

In ntotal')

End If


CReturn

End

C +WC

fndply -

Finds and returns the node position (ndpstn) of

C polygon npoly

In the tree.

CC ndpstn =

Node position of polygn npoly

C >

0, Node for npoly exists

C --It Node for npoly does not exist

CC-£ *************************************************************

Subroutine fndply(ndpstn,npoly)

Common /topology/1nfo(100),1 upper(100),I down(100),

«,11eft( 100),1r1ght( 100)

Common /commands/nmax,eps11n,del1n,delout

CIf


1 = 1ndpstn-0

Do 20 wh11e(ndpstn.EQ.0)

If (1nfo(1).EQ.npoly) Then

ndpstn-1

Else1-1 + 1If

(1.GT.nmax)ndpstn=-l

End If

20

End Do

ElseCall wrtmsg('

Error, npoly passed to FNDPLY out of range.*)

ndpstn*-1

End If

** / Q

C OO

Return

End

O

CC fndscn - Converts the pair of grid locations xgrld.ygrld Into

C there corresponding screen locations xscrn,yscrn.

C-

CSubroutine fndscn(xscrn,yscrn,xgrld.ygrid,nbrpts)

Dimension xgr1d(2),ygr1d(2),xscrn(2),yscrn(2)

Common /sca!e/xsc,ysc,xstart,ystart,x1n1t,y1n1t

CDo 50 1*1,nbrpts

xscrn(1)*x1n1t+(xgr1d(1)-xstart)*xsc

yscrn(1)*y1n1t+(ygr1d(1)-ystart)*ysc

50 Continue

CReturn

End

C+

V*C fndsld -

Finds the corners (ncorn,ncorn2) of the side of the

C polygon npoly that Is

closest to the point xtest.ytest.

C-V»

Subroutine fnds1d(ncorn,ncorn2.drnln,xtest,ytest,npoly,Itest)



Ayout(100,100)

Common /commands/nmax,eps11n,de11n,delout

Common /max/nptmax

Parameter {vaxmln*-1.7e+38,vaxmax*!.7e+38 )


Cncorn*0

ncorn2=0

1test«0

1set*0

dm1n*vaxmax

tota1d=vaxmax

CC - Test If

npoly Is

within range.

CIf


nbrpts-nump1y(npoly)

If (nbrpts.GE.1.AND.nbrpts.LE.nptmax) Then

Do 10

1*1,nbrpts

1up*1+l

If (1.EG.nbrpts)1up=l

Cxpoly(1)*xscr(npoly,1)

xpo1y(2)*xout(npoly,1)

xpo1y(3)*xout(npoly,lup)

xpoly(4)*xscr(npoly,lup)

xpoly(5)*x1n(npoly,lup)

xpoly(6)*x1n(npoly,1)

Cypoly(1)*yscr(npoly,1)

ypoly(2)

zyout(npoly,1)

ypoly(3)

zyout(npoly,lup)

ypoly(4)

3yscr(npoly,lup)

ypoly{5)

zy1n{npoly,lup)

ypoly(6) = y

1n( npoly, 1 )

C -

Now test If

the point xtest.ytest Is

In the polygon bounded

C by xpoly,ypoly.

CCal1 plytst(xpoly,ypoly,6,xtest,ytcst,Inout)

CIf

(Inout.EG.1> Then

totald»(xscr(npoly,1)-xtest)**2 +(yscr(npoly,1) -

&

ytest)**2+<xscr(npoly,tup)-xtest )**2+(yscr(npoly,1up>-

&

ytest)**2

If (totald.LT.dmln) Then

ncorn«1

ncorn2z tup

dm1n«totald

lset-1

End If

End If

10 Continue

CIf

(Iset.EQ.l) Then

ltest-1

ElsePrint *,*

Error, could not find polygon''s aide'

1test«-l

End If

ElsePrint *,'

Error, nbrpts out of range'

1test«-l

End If

ElsePrint *,'

Error, npoly out of range'

1test»-l

End If

CReturn

End

C +£ *************************************************************

C fndtop -

FIND TOP

- Finds the top node or root (ntop) of the

C tree In

the topology arrays.

C-£

*************************************************************

Subroutine fndtop(ntop)


A11eft(100),1r1ght(100)

Common /commands/nmax,eps11n,del 1n,de1out

Cntop*0

1 = 1 C

Do 10

wh11«(ntop.EQ.0)

If (1nfo(1).GE.1.AND.1nfo(1).LE.nmax.AND.1 upper( 1>.EQ.0

A.AND.11eft(1).EQ.0) Then

ntop*1

Else1-1 + 1If

<1.GT.nmax)ntop=-l

End If

10 End Do

CReturn

End

C+

£ *************************************************************

~7 C\C

fndtopnew -

FIND TOP NEW- Finds the top node or

root (ntop) of the

**. / vJ

C tree In

the newtopo arrays.

c- c

Subroutine fndtopnew(ntop)

Common /newtopo/Infnew(100)

,1upnew(100)

,1dwnew(\00),

&1Ifnewl100)

,Irtnewl100)


Cntop«0

1*1 C

Do 10

wh11e(ntop.EQ.0)

If (1nfnew(1).GE.1.AND.1nfnew(1).LE.nmax.AND.1upnew(1).EQ.0

&.AND.llfnewl1).EQ.0) Then

ntop«1

Elsei-l + 1If

(1.GT.nmax)ntop=-l

End If

10 End Do

CReturn

End

C +v»C

fndtpl

- Finds the and sets the topology of the polygon npoly

C the corner locations are passed to the test routines

C In

the temp common block.

CC The topology Is

an Implementation of a

quadruply-11nked

C list [Knuth, "Fundamental Algorithms", p.

3521.

CC-

Subroutine fndtp1(npo1y,ntop,1 test)

Common /newtopo/Infnew(100),1upnew(100),1dwnew(100),

41 Ifnew(100),1rtnew(100)

Common /screenloc/ntota1,nump1y(100),xscr(100,100),

&yscr(100,100)

Common /neighbors/1cnt,1n(100),Jcnt,Joutl100)

Common /state/If last,Iftln,Iftout,ndpstn,lup

Common /commands/nmax,eps11n,del In,del out

C CC - Test to see If

this Is

the first polygon

CIf

(ntotal.EQ.0) Then

Call fndnodlndpstn)

If (ndpstn.GE.1 )

Then

Infnewlndpstn)=npoly

1upnew( ndpstn )**0

1dwnew(ndpstn)*0

11fnew(ndpstn)*0

1rtnew(ndpstn)=0

ntop«ndpstn

1test«l

ElseCall wrtmsgl' Failed on ntotal=0 test')

1test»-l

End If

CC -

Start at top of tree... ntop

CElse If

(ntotal .GT.0) Then

ngon=ntop

nh1t=0

1cnt=0

Jcnt*0

1up*0

n1eft»0

Iflast-0

Ift1n=0

lftout=0

Do 5

1*1,nmax

ln<1)-0

Jout(l>-0

5 Continue

CC -

Find the next available node position In

the topology arrays

CCall fndnod(ndpstn)

CC -

Clear the arrays associated with this node.

CIf

(ndpstn.GE.1) Then

Infnew(ndpstn)»0

1upnew(ndpstn >*0

1dwnew(ndpstn)*0

1 Ifnew(ndpstn)*0

1rtnew( ndpstn)=0

1test=0

Else1test«-l

End If

CC Test npoly to see

If It

Is within ngon

CDo 10

whlle(ltest.EQ.0)

n1oc«Infnew(ngon)

1con»0

Call tstpgn(1nout,n1oc,1con,terror)

If (1error.LE.-l) Go To 100

If (1nout.EQ.0) Then

Call tstxcr(ncross,n1oc)

If (ncross.EQ.1)1nout=-1

End If

CIf

(Inout.EQ.1) Then

nh1t«l

If (1cnt.EQ.0)Ift1n«ngon

1cnt«1cnt+l

1n(1cnt)»ngon

nleft«ngon

ngon*1rtnew(ngon)

If (ngon.EQ.0) Then

C print *,'

Test

1' Call settpl<npoly)

1test-l

End If

CElse If

(Inout.EQ.0) Then

If (nhlt.EQ.0) Then

1con*l

nloc»1nfnew(ngon)

Call tstpgnlInoutZ,nloc,1 con,lerrorZ)

If (1error2.LE.-l) Go To 100

If (1nout2.EQ.0) Then

If 1ast = n

gon

nleft=ngon

ngon = 1 r

tnew( ngon )

If (ngon.EQ.0) Then

C p

Int *,'

Test 2'

1rtnew(nleft)*ndpstn

Inf new( ndpstn )ssn

po1y

1upnew(ndpstn)«1up

fdwnew(ndpstn) =0

11fnew(ndpstn)*nleft

1rtnew(ndpstn)=0

ItestM

End If

Else If

(InoutZ.EQ.1) Then

1up«ngon

ngon*1dwnew(ngon)

If (ngon.EQ.0) Then

C print *,'

Test 3'

1dwnew(1up)=ndpstn

Infnew(ndpstn)*npoly

1upnew(ndpstn)* lup

1dwnew(ndpstn)*0

1 Ifnew(ndpstn)=0

\rtnew(ndpstn)

e0

1test=l End If

Else If

(InoutZ.EQ.-1) Then

1test»-l

Call wrtmsg(' Error, polygon crosses another')

Else1test*-l

Call wrtmsg(' Error with InoutZ value (not equal

& to 1,0,-1)')End If

CElse If

(nhlt.EQ.l) Then

If (Jcnt.EQ.0)lftout=ngon

Jcnt«Jcnt+l

Jout(Jcnt)*ngon

nleft«ngon

ngon*1rtnewlngon>

If (ngon.EQ.0) Then

C Print *,

Test 4'

C --

Procedure to

reset arrays.....

CCall

settpl(npoly)

ItestM

Else If

(ngon.GT.0) Then

1test=0

ElseCall

wrtmsg(' Problem with ngon (less

than zero)')

1test»-l

End If

End If

Else If

(1nout.EQ.-l) Then

Call wrtmsg(' Error, polygon crosses another*)

1test«-l

ElseCall

wrtmsg(' Error

In tstpgn (Inout was not 1,0,-!)')

1test--l

End If

10 End Do

End If

100

Continue

** 73

If (1error.LE.-l.OR.lerror2.LE.- 1)

1test«-l

c+cccc-cc+ccccccccccccccccccccccccccccc-c

Return

End

**************************************************************

getgrd - Asks the user for the name of

grid (grdnam), and

reads In

the grid.

Subroutine getgrd(Itest)

Common /names/grdnaiu,modnam,modgrd

Character quest*80,modgrd*80,modnam*80,grdnam*80

10 Continue

quest*' Grid name'

Call «sknam(grdnam,quest,Itest)

If < Itest. E

Q.-DGo To 100

Call redgrdtgrdnam,Itest)


100 Continue

Return

End

*************************************************************************

getlIn - Returns the world coordinates (xl1ne,yl1ne) of

a line

entered on the Envision terminal.

The cross-hair cursor

keys or

the mouse may be used.

mcflag

Flag for

defaulting to

cross-hair cursor type

(mcur takes on

the same values as

mcflag)

* C

= Cross-hair cursor keys

* M

» Mouse

nllne

» Number of

points In

line xllne.yllne.

Iset *

Flag for

determining the connection of

end-

points (xl,yl,x2,y2) to the line.

« 2

* Connect (x2,y2) to

the end of

the line

xl 1ne(n1Ine),yl1ne(nlIne).

* 1

» Connect (xl.yl) to

the beginning of

the

1Ine xl1ne(1),yl1ne(1).

» 0 * Connect (xl,yl) and (x2,y2) as

In 1

and

2 above.

*-1 *

Do not connect endpolnts.

nptmax * The maximum number of

points that nbrpts*

nlIne can

equal.

nbrpts »

Number >=0 used for controlling the number

of points (nllne) that may be entered.

*************************************************************************

Subroutine getl1n(xl1ne,y11ne,n11ne,x1,y1,x2,y2,Iset,nbrpts,

&nptmax,mcflag,Itest)

Dimension x11 net 1

00),y11ne(100)

Character mcur*2,mcflag*2

1test*lmcur='N'


Call askmoc(mcur)


74

1test»-l

Elsemcf1ag»mcur

End If

Elsemcur "incf lag

End If

CIf

(mcur.EQ.»M') Then

Cal1 11nmou(xl1ne,yl1ne.nl1ne,xl,yl,x2,y2,1 set,nbrpts,

&

nptmax,Itest)

Else If

(mcur.EQ.'C') Then

Call 11ncur(xline,yl1ne,nl1ne,xl,yl,x2,y2,1 set.nbrpts,

&

nptmax,Itest)

End If

CReturn

End

C*

WC getmenu

- Prompts the user for screen menu Item and returns

C the Item number (NUMANS) and the first character of

C the string associated with the Item.

CC-

SubroutIne getmenu(ans,numans,mcur,xbox0,ybox0,xs1ze,ys1ze,

&xde1bx,ydelbx,nst-1ng,strIng)

Character*!*) str1ng(nstr1ng),ans*2

CIf

(nstrIng.GE.1) Then

CC - Prompt for cursor type,

If not already set.

CIf

(mcur.NE.'M'.AND.mcur.NE.'C') Then

Call askmoc(mcur)


1test=-l

ans='

numans=-l

Else1test=0

End If

Else1test«0

End If

CC -

Prompt for screen location.

CDo 10

wh11e(Itest.EQ.0)

Call wrtmsg(' Select menu command')

1err=l

Call retpnt(x,y,mcur,lerr)

If (lerr.GE.0) Then

1test2»0

xlftbx«xbox0

xrgtbx*xbox0+xs1ze

ybotbx=

!ybox0

ytopbx = ybox0-«-ys 1 z

e

1*1CC

- Test user entered coordinates against the possible boxes.

CDo 20 whlle(1test2.EQ.0)

If ((x.GE.xlftbx.AND.x.LE.xrgtbx).AND.

& (y.GE.ybotbx.AND.y.LE.ytopbx)) Then

ans-str1ng<1>(1:1)//'

' numans*1

1test»l 1test2»l

Elsexlftbx-xlftbx+xdelbx

xrgtbx*xrgtbx+xdelbx

ybotbx-ybotbx+ydelbx

ytopbx*ytopbx+ydelbx

1-1 + 1If

( 1 .GT.nstMng) Then

Call wrtmsg(' Sorry, could not tell

which

& answer you wanted...try again.')

Itest2--l

End If

End If

20

End Do

CElse If

(lerr.LT.0) Then

1test»-l

ans='

* numans*-!

End If

10 End Do

CElseans='

' numans«-l

Call wrtmsgC NSTRING passed to GETMENU was <=0

f)

End If

CReturn

End

C +

C getmou - Returns the world coordinates of

the Envision graphics

C cross-hair cursor when using the mouse.

C-V*

Subroutine getmou(mode,1x,1y)

CCal1

moul1n

Cal1 mouexm(*0*)

C10

Continue

Read {5,20,err»90)mode,1x,1y

20 Format (13,2z4)

Ca11 mousop

Call alphon

Return

C90

Continue

Call alphon

Call wrtmsg(* Error,

1n reading mode and coordinates, try again*)

Go To 10

CEnd

C +

C getply - Returns the world coordinates (xscrn, yscrn) of

a polygon

**, -y s

C from the Envision terminal.

The cross-hair cursor keys

; / O

C or

the mouse may be used.

cC mcflag «

Flag for defaulting to cross-hair cursor type

C (mcur takes on the same values as mcflag)

C *

C « Cross-hair cursor keys

C »

M » Mouse

CC nbrpts *

Number of

points In

polygon xscrn,yscrn

C-r *************************************************************************

Subroutine getply(xscrn,yscrn,nbrpts,mcflag,Itest)

Dimension xscrn(100),yscrn(100)

Character mcur*2,mcflag*2

Cnbrpts=0

1test«l

mcur-'N'

If (mcflag.EG.'N') Then

Call askmoc(mcur)

If (mcur.EQ.'QM Then

mcflag-'N'

1test"-l

Elsemcflag«mcur

End If

Elsemcur=mcflag

End If

CIf

(mcur.EG.'M') Then

Cal1 entmou(xscrn,yscrn,nbrpts,Itest)

Else If

(mcur.EQ.*C*) Then

Cal1 entply(xscrn,yscrn,nbrpts,Itest)

End If

CC -

Test nbrpts against Itest...(did user crash out or what)

C also test nbrpts less than or equal to zero...

CReturn

End

C+

£ **************************************************************

C getsub

- Gets the subgrld locations entered using the cursor

C keys or

Envision mouse.

C-£ **************************************************************

Subroutine getsub(Itest)

Common /subscreen/xscrn(2 ),yscrn(2),xgr1d(2 ),ygr1d(2)

Character quest*80,mcflag*2,mcur*2,ans*l,1d*56,pgm*8,IntypeM

Character votf1g*2

Common /sca1e/xsc,ysc,xstart,ystart,x1n1t,y1ntt

Common /subgrtd/lcmln,fcmax,Irmln,1rmax,ncm1n,ncmax,nrmtn,nrmax


Common /grIdspecs/1d,pgm,nc,nr,xo,dx,yo,dy,1proJ,cm,b1

Common /ortglna!/Iwcorg,Jwcorg,nxorgp,nyorgp

Common /flags/mcflag,votf1g

C1test«0

If (mcf lag.EG. 'N')

Then

Call askmoc(mcur)

If (mcur.EQ. *Q* )

Then

-7-,1test«-l

' / /

Else

mcflag«mcur

End If

If

Else

mcur=mcflag

End If

(1test.EQ.-l)Go To 100

CC -

Print help message

CIf

(votflg.EQ. W) Then

Ca 1 1

hlpmou

Call wait

End If

Citest2-0

1-0

Do 10

wh11e(1test2.EQ.0)

Call retpnt(x,y,mcur,1 ret)

If (Iret.GE.1) Then

1-1*1

If (1.EQ.l) Then

xscrn( 1 ) = x

yscrn(1 ) = y

Elsexscrn(2)=x

yscrn(2 )*y

1test2*l

End If

Else1test2»-l

1test=-l

End If

End Do

If (1test2.EQ.-l)Go To 100

10

lntypes'0'

Cal

Cal

Cal

Cal

Cal

setl1n(Intype)

drwl1n(xscrn(1)

drwl1n(xscrn( 1 )

yscrn( 1 )

yscrn(2)

xscrn(1 )

xscrn(2)

yscrn(2) )

yscrn(2))

drwl 1n(xscrn<2),yscrn(2),xscrn(2),yscrn( 1 ))

drwl 1n(xscrn(2),yscrn(1),xscrn(1),yscrn(1))

xsc«float(nxp1x)

ysc»float(nyp1x)

If (xscrn(1).GT.xscrn(2)) Then

xdum=xscrn(1)

xscrn(1)*xscrn(2)

xscrn(2)«xdum

End If

If (yscrn(1).GT.yscrn(2)) Then

ydum«yscrn(1)

yscrn(1)«yscrn(2)

yscrn(2)«ydum

End If

rscxsc=0.0

rscysc=0.0

If (abs(xsc).GT.1.0e-16)rscxsc-1.0/xsc

If (abs(ysc).GT.1.0e-16)rscysc=1.0/ysc

Do 20 J=l,2

xgr1d(J)=xstart+(xscrn(J)-1wcorg)*rscxsc

ygr1d(J)

ssystart + {

yscrn(J)-Jwcorg)*rscysc

20 Continue

78

ncm1n*1nt(xgr 1d< 1 ) )

ncmax«1nt(xgr1d(2)+0.5)

nrm1n=1nt(ygr1d(1 ) )

nrmax»1nt(ygr1d(2)+0.5)

CIf

(ncmln.LT.1)ncm1n-l

If (ncmax.GT.nc)ncmax=nc

If (nrmln.LT.1)nrm1n-l

If {nrmax.GT.nr)nrmax*nr

C1test*l

Call zomstr(Itest)

C100 Continue

Return

End

C +£ *************'

C graphoff -

Turns off the graphics character mode.

See page 5-8

C In

Envision Reference Manual, May 23,

1983.

C-£ *************

Subroutine graphoff

Character com*3

Ccom-'RG0*

Call esccom(com)

CReturn

End

C + CC

grdln

- Asks the user whether a

previous grid should be used

C or

If a

new grid should be created.

C-

\+

Subroutine grd1n(Itest)


C1test*0

Do 10

whllelItest.EG.0)

quest*' Read or

create a

grid (r/c/q)'

1val=laquest(quest,ans,'(a2)',0)

CIf

(ans.EG.'R') Then

Cal1 getgrd(Itest)

Else If

(ans.EG.'C'> Then

Call crtgrd(Itest)

Else If

(ans.EQ.'0'.OR.Ival.EG.-1) Then

1test--l

ElseCal1 errmsg

End If

If ((ans.EQ.'R'.OR.ans.EG.'C').AND.1 test.EQ.0)1 test-1

10 End Do

CReturn

End

C+

£ **************************************************************

C grvmod - Writes out a GRAVPOLY model using the POLYGON model

. '

' ,-n

C Information and user entered responses.

*!* is

C-

" ' '

\+

Subroutine grvmod(Itest>


Common /topology/1nfo(100),1 upper(100),1down(100),1left(100),

&1r1ght(100)



Common /grIdspecs/1d,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,bl

Common /orIglnal/Iwcorg,Jwcorg,nxorgp,nyorgp

Character 1dplot*40,If11e*50,If 11e2*50,quest*80,1fmt*80,

&1d*56,pgm*8,comf11*80,ans*2,ans2*2,name*8,un1x*4,un1z*4

namel1st/parms/Iplotr,Ibody,If lie,If 11e2,Isqs,datum,xseale,

&dc,un1x,un1z,name,height,ifmt,1dp lot,lobs,1calc,1res,naxco1

Ctplotr-9

naxcol-130

1body-0

1obs*0

1ca1c-0

1res*0

Idplot-'

* Iflle-'

* 1f11e2«'

* lsqs*0

datum*0.

xsca!e*0.

dc>0.

unlx-'kl1m'

unlz*'feet'

name*'grIdded'

helght-0.

CC - Ask for name of

file containing fleldpolnt Information.

C1test-l

quest** Name of

file containing fleldpolnt Information'

1val"1aquest(quest,If 1le,'(a50)',0)


CC -

Name (type of data read In

from If l

ie).

C1test-0

Do 40 wh11e(ttest.EQ.0)

quest*' Type of data

In fleldpolnt file (enter H

for help)*

1val*1aquest(quest,name,'(a8)',-8)

CIf

(name(lsl).EQ.'G') Then

name*'grIdded'

helght-0.0

Write (6,45)

45 Format (2x,'Height of fleldpolnt grid above the same datume that')

quest*'

Is used to reference the body heights'

1val-1rquest(quest,height,*(el6.8)',16)

1test-l

If (Ival.EQ.-l)1test*-l

Else If

(name.EQ.'H'> Then

Call hlpg2

Else If

( Ival.EQ.-l) Then

1test«-l

Else

CC -

Ask for format type of data.

C1test2«0

Do 25

wh11e(1test2.EQ.0)

quest"' Enter format to use when reading In

your file*

1va1=laquest(quest,Ifmt,'(a80)',0)

If (Ival.EO.-l> Then

1test--l

1test2--l

Else If

(Ifmt.NE.'

') Then

1test2-l

1test»l

ElseCal1 errmsg

End If

25 End Do

End If

40 End Do

If ( 1

test.EQ.-DGo To 100

CC -

Ask for the name of standard grid containing the heights of

C fleldpolnts.

Cquest-' Name of standard grid containing heights of fleldpolnts'

Ival-laquest(quest,1f11e2,'(a50)',0)


CC -

Ask for print out Identifier.

Cquest-' Identifier for printer output*

Ival-laquest(quest,1dp lot,'(a40>',0)

If (1val.EQ.-l)Go To 100

CC -

Ask If

constant should be added to calculated anomalies.

Cltest-0

Do 20 wh11e(ttest.EQ.0)

quest-' Add a

constant to the calculated anomalies (y/n/q)'

Ival-laquest(quest,ans,'(a2)',0)

CIf

(ans.EQ.«Y') Then

quest-' Constant to be added*

Ival-lrquest(quest,daturn,*(el6.8)',16)

1test-l

If (Ival.EQ.-l>1test=-l

Else If

(ans.EQ.'Q'.OR.Ival.EQ.-l) Then

1test--l

Else If

(ans.EQ.*N*) Then

ltest=l

datum-0.0

ElseCall errmsg

End If

20 End Do


CC -

Ask Isqs determination.

C1test-0

Do 30 wh11e(Itest.EQ.0)

quest3

' Least-squares comparison/read observed values

& (y/n/h/q)'

1va1 = laquest(quest,ans2,'(a2 >',0)

CIf

(ans2.EQ.'Y') Then

Itest2

»0

*

f\ 1 D

o 35

wh

11

e( 1

tes

t2.E

Q.0

) t£

* O

f 1 s

qs**0

quest-* What value for

LSQS (0/1/7,

// to quit)*

1va1=11quest(quest,Isqs,*(12)*,-2)

CIf

(lsqs.EQ.0.0R.Isqs.EQ.1.OR.lsqs.EQ.7) Then

1test2-l

1test-l

Else If

( Ival.EQ.-l) Then

1test2--l

1test«-l

ElseCal1 errmsg

End If

35 End Do

Else If

(ans2.EQ.'N*) Then

lsqs-0

1test«l

Else If

(ans2.EQ.'H*) Then

Call hlpgl

Else If

(ans2.EQ.'Q*.OR.Ival.EQ.-l) Then

1test--l

ElseCall errmsg

End If

30 End Do


CC - Ask for units In

x&y directions.

C1test-0


unlx-'KILM*

quest-' Units In

x&y direction (FEET/KILF/MILE/METR/KILM/H/Q)'

1val*1aquest(quest,un1x,'(a4)',-4)

C1test-lIf

(unlx.EQ.'FEET'> Then

un 1x«'feet*

Else If

(unlx.EQ.'MILE*) Then

un1x«'mlle*

Else If

(unlx.EQ.'KILFM Then

unlx-'kllf'

Else If

(unlx.EQ.'METR') Then

un1x«'metr *

Else If

(unlx.EQ.'KILM' )

Then

un1x«'k11m*

Else If

(unlx.EQ.'H*) Then

Call h1pg3

1test-0

Else If

(unlx.EQ.'Q*.OR.Ival.EQ.-l) Then

1test--l

ElseCall errmsg

1test-0

End If

50 End Do



z direction (height).

C1test«0


un1z='FEET'

quest*' Units In

z direction (FEET/KILF/MILE/METR/KILM/H/Q)'

Ival = laquesKquest, un 1z , ' (a4 ) ',-4)

32

1test=lIf

(unlz.EQ.'FEET') Then

un 1 z

*'feet'

Else If

{unlz.EQ.'MILE') Then

un1z«'mlle'

Else If

(unlz.EQ.'KILF') Then

unlz-'kl If

Else If

(unlz.EQ.'METR') Then

unlz*'metr'

Else If

(untz.EQ.'KILM'> Then

unlz-'kt1m'

Else If

(unlz.EQ.'H') Then

Call hlpg3

1test»0

Else If

(untz.EQ.'Q'.OR.tval.EQ.-l) Then

1test--l ElseC

a11 errmsg

ttest-0

End If

60 End Do


CC -

Ask for print switch to use.

C1test»0

Do 65

whtle(Itest.EQ.0)

Iflag=0

quest*' Print switch for body Information (1/0)'

1val«11 quest(quest,If lag,'(11)',1)

CIf

( Ival.EQ.-l) Then

1test=-l

Else If

(If lag.EQ.0.OR.If lag.EQ.1) Then

ttest=l ElseC

a11 errmsg

End If

65 End Do

If (Itest.LT.0)Go To 100

CC -

Ask which parm from the parm arrays to use when creating

C this model.

CCall askgvl(tone,ttwo,Ithree,ttest)

If (ttest.EQ.-l)Go To 100

CC -

Ask for the name to call this GRAVPOLY file (comfll)

C70 Continue

quest=' Name to call command file to run GRAVPOLY'

1val»1aquest(quest,comf11,'(a80)',0)


If (comfll.EQ.' MGo To 70

CC -

Open the model file and write out the model.

COpen (11,f1le=comf11,status='new',carrtagecontrol = '1 1

st')

Write (11,nml-parms)

Call fndtop(ntop)

next = n

top

ttest«0

delxcn=dx/nxorgp

delycn*dy/nyorgp

Do 150 wh11eMtest.EQ.J0)

ngon=next

npoly* 1nfo(ngon )

nbrpts=numply( npoly)

If (nbrpts.GT.0> Then

Do 120 t» 1 ,

nbrpts

xpo1y( 1 )

»xo+(xscr( npol y , 1 > - I

wcorg )*delxcn

ypoly( 1 > »

yo+(yscr ( n

poly , 1 > -

Jwcorg )*delycn

120

Continue

CC -

Ffnd the handedness of the polygon (by right hand rule).

C gamma

> 0.0

* polygon ts

counter-clockwise

C gamma

< 0.0

» polygon 1s

clockwise

CCa 11

tota 1 t( g

amma , x

poly ,ypo1y , n

brpts )

CIf

(gamma. GT.0) Then

nstarfnbrpts

nend*l

1step«-l

Elsenstart* 1

nend»nbrpts

1step»l

End If

CC -

If the body has a

parent, we need to determine If

the parent-

C body/current-body overlap.

CI up =1 u

pper (ngon )

If ( 1

up.GT.0) Then

np1yup-info( 1 up )

Cpartop*parm(nplyup, lone)

parbot*parm( np l

yup , 1

two)

bodtop*parm(npoly , l

one)

bodbot«parm( npoly , I

two)

CC - We need only remove a

slab If

the parent body and current body

C overlap In

the z direction (height).

CIf

( ( (bodtop.LE.partop) .AND. (bodbot .GE .

parbot ) ) .OR.

& ( (

bodtop.GT.partop) .AND. (bodbot . LT. p

ar top > ) .OR.

&

( (bodtop.GT. parbot) .AND. (

bodbot. LT.parbot)) )

Then

CIf

(bodtop.LE.partop) Then

z top = ami n 1 ( b

od top , p

ar top )

Elseztop«partop

End If

CIf

(bodbot. GE. parbot) Then

zbot=amax 1 (

bodbot , p

arbot)

Elsezbot*parbot

End If

CC - Write out the slab parameters and coordinate Information.

CWrite

( 1 1 ,*)nbrpts, 1f lag , -

parm( nplyup , I

three) ,

Write

( 1 1 ,*)(xpoly( 1 ) ,

ypoly( 1 ) , 1 *

nstart ,nend , I

step)

End If

End If

CC - Write out the parameters and current body coordinate Info.

CWrIte (11, *

)nbrpts.If lag,parm(npoly,1 three),

& parm(npoly,lone),parm(npoly,Itwo)

WrIte (11,*)(xpoly(11>,ypoly< 1 1 ) , 11 = n

start,nend,Istep)

End If

CC -

Get next polygon

CCall

walk(next.ngon,ItestZ)

If (next.EQ.0.0R.1test2.LE.0)1test=l

150 End

OoClose (11)

C100

Continue

Return

End C + wC

gtpnt

- Returns the current world coordinates (x,y)

of the

C Envision cross-hair cursor.

CC ans = Character answer that user

entered [format(a 1)]

C *

e or

f, prompts the terminal for

screen coord.,

C and returns character answer.

C »

h *

returns ans-*h'

C s

q *

retL-ns ans='q'

C- w

Subroutine gtpnt(ans,x,y)

Character dum*3,ans*l

C1dx«0 1dy=0

Call setkam

Cal 1 loccur(tx,1y)

1test=0

If (1test.EQ.0) Then

10 Continue

dum-'

'Read (5,15,err=10)dum

15 Format (a3)

20

Continue

CIf

(dum.EQ.*E*.OR.dum.EG.«e') Then

Call loccur(1xloc,lyloc)

x=float(Ixloc)

y=float(lyloc)

ans»*e*

ItestM

CElse If

{dum.EQ.«F'.OR.dum.EG.'f*) Then

Call loccur(Ixloc,lyloc)

x=float(Ixloc)

y=float(lyloc)

ans='f*

1test»l C

Else If

(dum.EO.*H*.OR.dum.EQ.'h') Then

ans= * h'

1test=l

Else If

(dum.EQ. 'Q' .

OR.dum.EQ. 'q' )

Then

ans= 'q'

1test=l

CElse If

(dum.EQ. 'OS* )

Then

1dx=l 1dy=l

CElse If

(dum.EQ. 'Om* )

Then

1dx=-l

1dy«l C

Else If

(dum.EQ. '01 ')

Then

CElse If

(dum.EQ. 'Ox' >

Then

1dy=l C

Else If

(dum.EQ. 'Of >

Then

1dx=-l

CElse If

(dum.EQ. 'OrM Then

1dy=-l

CElse If

(dum.EQ. 'Ov' )

Then

tdx»l C

Else If

(dum.EQ. 'C\"' )

Then

1dy=10

CElse If

(dum.EQ. 't\$' )

Then

1dx»-10

CElse If

(dum.EQ- 'CM ')

Then

1dy=-10

CElse If

(dum.EQ. 'C\&') Then

CEnd If

CIf

( Itest. EQ.0) Then

1x= 1x+tdx

1y=fy+ 1 d

yCal 1

movcur ( 1x , 1y )

1dx=0

fdy»0

Go To 10

End If

End If

CReturn

End

subroutine hlpadd( Itest)

cftest=l

print *,'

Help for adding polygons not available'

creturn

end

C+

Q *************************************************************

C hlpapt -

Help message for subroutine addpnt (ADD POINT).

c- c

Subroutine hlpapt

Character ans*l

CWrite (6,10)

IB Format (/,'

Position the cross-hair cursor to a

corner of'

&' a

polygon, then choose:',/

c

&/,'

&/,'

&/,'

&/,'

Write

20 Format

(KEY)

(MOUSE)',

e or

f 1

or 2

B Selects the polygon'.

h 3

» Help message' ,

q 2&3

= Quit and return to Edit polygon mode',/)

(6,20)

(' When the polygon you selected Is

found.

It will*.

&' be drawn In

white on the',/,' screen and you will be asked*.

&' to select (using the cross-hair cursor):',/.

C

&/,'

&/,'

(1) The side of the polygon where points will be added*.

(2) An endpolnt of the selected side.',/)

Call wait

CC +CCCC-

C

Return

End

**********

hlpchg -

**********

***************************************************

HeLP CHanGe -

Displays the options available for

change labels/parameters associated with polygons.

***************************************************

Subroutine hlpchg

CCC +CCCC-

c

Write

10 Format

&/,'

&/, '&/, '

Return

End

**********

hlpcom -

**********

(6,10)

(/,' Change mode options:',/

1 » Change/assign labels on parameter list'.

p » Change/assign parameters to polygons'.

q »

Quit and return to Polygon add/... /edit mode*,/)

********* ****>« *

*************************************

Help module for Polygon command level, called by

the program POLYGON.

***************************************************

Subroutine hlpcom

CCCC +CCC

Write

10 Format

&*& '4*&*&

'& '4'Return

End

**********

hlpcpl

-

(6,10)

(/,' Polygon options available:',//.

p »

Polygon (add/change_parm/delete/ed1t_poly )

mode',/

o » Output P l

ouff /Godson file or

standard grid',/.

r *

Read model from file*,/.

w » Write model to output file',/,

S » Command parameter change mode',/.

z » Zoom to a

subgrld of grid',/,

Q *

quit' ,/)

****************************************************

Help message for subroutine pckpnt (PICK POINT)

for picking with the cross-hair cursor the corner of

87

V^

*

C a

polygon.

C-CSubroutine hlpcpl

CWrite (6,10)

10 Format (/,'


corner of,

A/,' this polygon and enter the screen location.',/)

CReturn

End

C +

C hlpcpy -

Prints help message about using the CPYPLY (COPY POLYGON)

C feature.

C-I*

Subroutine hlpcpy

CWrite (6,10)

10 Format (/,'

To copy a

polygon:',/,

&/,*

(1) Position graphics cursor to a

corner of polygon to',

&' copy',

&/,'

(11) Use the following keys to Identify the polygon',

&' or

screen location*,

&//,'

MOUSE

KEYBOARD

FUNCTION',

&/,

1 "e"

Sends cursor position to program',

&/, 2

"f" "

" "

" &/,

3 "h"

Help',

&/, 243

"q" Quit',/,

&/, (111)

Position the graphics cursor to the location to copy*,

&' the polygon at',

&/,'

(1v) Press appropriate key(s) as In

step (11).',

&//,'

NOTE:

The parameters for this polygon are also copied.',/)

CReturn

End

C +

C hlpcur -

Help message for entering a

single screen location

C using the cross-hair cursor keys and keyboard com-

C mand keys.

Called by subroutine retpnt (RETURN POINT)

C-

£ *************************************************************

Subroutine hlpcur

CWrite (6,10)

10 Format (/,'

To enter a

screen location, position the cross-hair',

&' cursor to the desired',/,' location and then type:',/,

&/,'

e or

f »

Enters the cross-hair cursor location',

&/,'

h Help',

&/,'

q Quit (no point Is

entered)',/)

CReturn

End

C +v»C

hlpdel

- Prints help message on using the delply (DELETE POLY-

C GON) mode.

C-V*

Subroutine hlpdei

CPrint *,*

Help for deleting polygon not available yet*

cReturn

End

O

CC hlpdpt -

Help message for subroutine delpnt (DELETE POINT).

C-

Subroutine hlpdpt

Character ansM

CWrite (6,10)

10 Format (/,*


corner of*,

&' a

polygon, then type:',/,

&/,'

(KEY)

(MOUSE)',

&/,'

e or

f 1

or 2

« Selects the polygon',

&/,'

h 3

Help message',

&/,'

q 2it3

=

Qu

it an

d

retu

rn

to

Ed

it p

oly

go

n',

&'

mo

de

',/) C

Write

(6

,20

)20 Format (*

When the polygon you selected Is

found,

1t will',

&* be drawn In

white on the screen',/,' and you will be asked',

&* to select (using cross-hair cursor), the corner of this',

&/,' polygon to delete.',/)

CCall wait

CReturn

End

C +V*C

hlpedt -

Help message for Edit polygon mode.

C-

**

Subroutine hlpedt

CWrite (6,10)

10 Format (/,'

Edit mode options:',/,

&/,*

a * Add points',

&/,'

d =

Delete a

point',

&/,'

m = Move a

point',

&/,'

q = Quit and return to Polygon mode',/)

CReturn

End

C +

C hlpent -

Asks If

help

Is need for entering a

polygon.

C-

Vx

Subroutine hlpent(Itest)

Character ans*1,answ*1,quest*80

C1test=0


10 Continue

answ='y'

quest3

' Do you need Instructions (y/n)'

1va1 = 1aquest(quest,answ,'(a 1)',1)

CIf

(answ.EQ.'y*) Then

Call msgent

1test»l

89

Else If

(answ.EQ. 'n' )

1test-l

Then

C +CCCC-C +

WC C C-V*

Else If

(answ.EQ.'/*) Then

1test»-l

ElseCal 1

errmsg

End If

If ( 1

test.EQ.0)Go To 10

End If

Return

End

hlpgl

- Prints help message at user's terminal about least-

squares determination when generating a

GRAVPOLY file.

[***********!

Subroutine hlpgl

Write (6,10)

10 Format (/,'

LSQS

- A number that determines

If fleldpolnt',

&' (observed) values will be',/,' read or not or whether a',

&' least-squares comparison will be made between the',/,

&' calculated and observed values.',//,

&' 0 »

No fleldpolnt (observed) values will be used.',

&' It

must be kept In

mind',/,'

that It

Is always',

&' necessary to read fleldpolnt locations In

order to',

&/,'

define the grid points at which the model',

&' values will be calculated.',

&/,'

1

Fleldpolnt values will be read and used to*

&' calculate residual*,/,'

values (observed-',

&'ca1culated).',

&/,'

7 »

A least-squares comparison between the observed',

&' and calculated values',/,'

will be made to',

&* determine the best density contrast.',/)

Return

End

r***i

hlpgZ

- Prints help message at user's terminal about data type

of fleldpolnt f1le.

!***********{

Subroutine hlpgZ

Write (6,10)

10 Format (/,'

Enter the type of

data In

the fleldpolnt file.',

&' Default Is

"grldded" or

"g",',/,' which means that the',

&' fleldpolnt data will be read as a

standard USGS geophysics',

&' grldded file.',/,' Any other character (maximum of 8)

will',

&' be assusmed a

user formatted file.',/,'

If a

user formatted',

a standard USGS geophysics file of the same',/.

' file Is

read,

' data with the name "GRAVPOLY .OBS "

will be created.',/)

Return

End

subroutine hlpg3

print

return

end

Made It

to hlpg3'

c cSubroutine hlpmgl

CWrite (6,10)

10 Format (/,

&* LSQS Is

a number that determines what type of field-*,

A'polnt (observed) values*,/,* will be read or

what type or*,

&* least-squares comparison will be made between',/,* the*,

&* calculated and observed data.*,

&/,*

0 *

No fleldpolnt (observed) values will be used.*,

&* It

must be kept*,/,

&* In

mind that It

Is always necessary to read*,

4* field point*,/,

A* locations

In order to define the grid points',

&* at which the model*,/,

&* values will be calculated',/

&/,'

1

y component of magnetic anomaly*,

A/,*

2 »

x component of magnetic anomaly*,

&/,*

3 * Vertical component of magnetic anomaly (some*,

&* ground surveys)*,

&/,*

4 *

Total horizontal component of magnetic anomaly*,

&/,*

5 *

Total magnetic anomaly (the usual observed*,

&* aeromagnetlc anomaly)*,

A/,*

6 A best total magnetization vector (amplitude,*,

&* declination and*,/,

&* Inclination) will be determined by a

least-*,

&*square comparison*,

&/,*

between the observed and calculated values.*,

&/,*

7 *

A best susceptibility, assuming no remanent*,

&* magnetization, will',

&/,*

be determined by a

least-squares comparison*,

&* between the*,

&/,*

observed and calculated values.*,/)

CReturn

End

hlpmou -

Prints help messages on users terminal about using

C the Envision mouse or cross-hair cursor keys.

C-CSubroutine hlpmou

CCal1 msgmol

Call msgmoZ

Ca11 msgmo3

CReturn

End

O

CC hlpmov -

Prints help message about using the MOVPLY (MOVE POLYGON)

C feature.

C-

CSubroutine hlpmov

CWrite (6,10)

Return

91

End

O

CC hlpmvp -

Help message for moving a

single point, called

C by subroutine movpnt (MOVE POINT).

C-

V*

Subroutine hlpmvp

Character ans*l

CWrite (6,10)

1.0 Format (/,'

To move a

corner point, position the cross-hair',

&' cursor to a

corner of the*,/,' polygon, then type:',/,

&/,'

(KEY)

(MOUSE)',

&/,'

e or

f 1

or 2

B Enters the cross-hair cursor location*,

&/,'

h 3

Help',

&/,'

q 2&3

- Quit (no point Is

entered)',/)

CWrite (6,20)

20 Format ('

The polygon that you selected will be drawn In

white',

&* on the screen.

The point*,/,.' to be moved Is

entered',

&' by positioning the cross-hair cursor over the desired',

&/,' corner of the polygon (entering this corner location),',

, &*

and then positioning the',/,' cursor to the new location',

&' for this corner.',/)

CCall watt

CReturn

End

C+

\+C hlpout -

HeLP OUT -

Prints help message at user's terminal

C about Polygon output file types.

C-£ *************************************************************

Subroutine hlpout

CWrite (6,10)

10 Format (/,'

Output file options:',/

&/,'

p « Plouff/Godson format file (GRAVPOLY/MAGPOLY)',

&/,'

s » Standard grid file',

&/,'

q - Quit and return to POLYGON command',/)

CReturn

End

C +£

*************************************************************

C hlpval

- Prints help message about options available In

the

C chgpar (CHANGE PARAMETER) mode.

C-£ *************************************************************

Subroutine hlppar

CWrite (6,10)

10 Format (/,*

Options for changing polygon parameters:',/,

&/, '

a *

All polygons (via tree structure)',

&/,'

p «

Pick Individual polygons using cursor',

&/, '

q * Quit',/)

CReturn

End

_ ^c+

92£ **************************************************************

* *

hlpplf -

Help message for PLOUFF/GODSON GRAVPOLY/MAGPOLY out

put files.

***********

Subroutine hlpplf

Write (6,10)

10 Format (/,'

Enter "g"

for a

gravity model, or "m"

for a

magnetic*

&,&' model.',

A/,' NOTEi GRAVPOLY and MAGPOLY assume that the positive',

A' direction

Is upward.',/)

Return

End

t***ihipply -

Prints help message for plycom (POLYGON COMMAND) sub

routine.

Subroutine hipply

Write (6,10)

10 Format (/,'

POLYGON add/change/delete/edit options:',/

Add a

polygon *,

Change polygon parameters',

Delete a

polygon'.

Ed It a

polygon',

Special functions',

Cult and return to POLYGON command',/)

A/,

A/,

A/,

*/,

A/,

A/,

acdesqR

etu

rnE

nd

hlprot -

Prints help message about using the ROTPLY (ROTATE POLYGON)

feature.

Subroutine hlprot

Write (6,10)

10 Format (/,*

To rotate a

polygon:*,/,

A/,'

(1) Position the graphics cursor to a

corner of*,

A' the polygon to rotate',

A/,'

(11)

Use the following keys to Identify the polygon',

A' or screen location',

A//,'

MOUSE

KEYBOARD

FUNCTION',

"e" Sends cursor position to program*,

II X H

II M

II II

H ,

"h" Help',

"q" Quit',/,

Choose the location to use for the center of',

(corner picked In

steps (1)

and (11) may be used'.

Press appropriate key(s) as In

step (11).',

Enter rotation angle In

degrees.',/)

hlprtZ -

Help for subroutine rotply (ROTATE POLYGON), sends

A/,

A/,

A/,

A/,

A/,

A'

rA

/,A

/,A

/,

1232

A3

(11

1)

Cho

ota

t Ion

' ,(C

O( 1 v )

Pre

(v)

En

t

Retu

rnE

nd

93

C message to user on positioning cursor for origin to

C rotate polygon about.

C-

Subroutlne hlprtZ

CWrite (6,10)

10 Format (/,*

Move the cross-hairs to the location of the origin*,

&' to rotate this',/,* polygon about, and enter this point.',/)

CReturn

End

C+

C hlpspf -

Help Information for SPFCOM -

(SPECIAL FUNCTIONS MODE)

C-

Subroutlne hlpspf

CWrite (6,10)

10 Format (/,'

Special functions are:*,/,

&/,'

c * Copy a

polygon,*,

&/,*

m * Move a

polygon,*,

&/,*

r Rotate a

polygon,',

«,/, ' q

« Quit. ' ,/)

CReturn

End

C +£ **************************************************************

C hlpstk -

Help message for stack release mode.

Called by sub-

C routine zomstk (ZOOM STACK).

C-£ **************************************************************

Subroutine hlpstk

CWrite (6,10)

10 Format (/,'

Zoor stack release options:*,/,

&/,'

b * bottom of stack (oldest zoom values)*,

i/,'

c

clear zoom stack',

&/,'

t *

top of stack (youngest zoom values)',

&/,*

q * quit or //

return to zoom command level',/)

CReturn

End

C +WC

hlpzom -

Help message for zoom command mode.

C-£ **************************************************************

Subroutine hlpzom

CWrite (6,10)

10 Format (/,'

Zoom options available:',/,

i/,'

c »

Clear zoom stack',

&/,'

d =

Draw grid using a

selected zoom value',

&/,'

r *

Recall and draw grid using zoom values at top of',

«,' stack',

i/,'

s » Select a

subgrld (using mouse, cursor, or coords)*,

&/,'

u *

Unzoom and draw grid on screen (does nothing',

i/,*

to zoom values)',

&/,'

q * Quit and return to Polygon command',/)

' '

c **

94Return

'

i

c+cccccccccccccccccccccccc-c

End

IAQUEST -asks question with character answer

Ireturn *

IAQUEST (quest,ava1,form,mode)

Ireturn *

-1 1f

*//* was given as

response (user

wants out)

0 If

no response (user

took default)

1 If

user responded (returns response In

aval)

quest =

Character string containing question to be asked

(with no

? at the end,

It Is

added by function)

aval «

Character string to

receive answer

(used to pass default If

one Is

available)

form =

Character string containing fortran format to be

used to read the user

response

mode *

Integer control parameter:

mode

> 0,

default allowed

mode «

0, no

default allowed, upshift response

mode <

0, default allowed, upshift response

Integer Function 1aquest(quest,ava1,form,mode)

Character questM*) ,form*( *) ,aval*( *)

Character*100 str,form2*10,ans*80,astr*30

1aquest*0

Iqlen"1tlen(quest)

1rlen=1tlen(ava1)

If (mode.LT.0)Cal1 upshIft(ava1)

If (trlen.EQ.0)1rlen=l

If (mode.NE.0) Then

str=quest(1:Iqlen)//

1 s 1 en * 1 q 1 en + 1 r 1 en + 4C '

//aval(1:Irlen)//']?'

Else

str=quest(1:1qlen)//

f?' 1slen=Iqlen*1

End If

Write (formZ,105)1slen

105 Format

(f(x ,a', 1

3,',$)')

13 Write (6,form2)s' .-

Read (5,form)ans

1alen-31

1alen=1tlen(ans)

If ( 1

alen.NE.0) Then

If (ans.EQ.'//') Then

laquest--!

Else

iaquest=1

aval(1:1en(aval))=ans(l:len(aval))

If (mode.LE.0)Cal1 upshIft(ava1)

End If

Else

If (mode.EQ

End If

Return

End

0)Go To 13

C +CC

IDEBLANK- removes all

blanks and returns length

95

C Ireturn =

IDEBLANK (string)

CC Ireturn =

length of

the string without blanks

C string

* character string to

be de-blanked

CC-

Integer Function Ideblank(str1ng )

Character*256 str1ng*(*),temp

temp='

'1temp»len(strIng)

Do 10

1=1,Itemp

If (str1ng(1:1).EQ.' ')Go To 10

tempiJ:J)-str1ng( 1:1)

J-J + 1 10

Continue

str1ng=temp

1deblank=J-l

Return

End

C+C IIQUEST - Asks a

question with an

Integer answer

CC Ireturn »

IIQUEST (quest,Iva1,form,mode)

CC Ireturn

= -1

If '//'

was given as

response (user

wants out)

C 0 If

no response (user

took default)

C 1

If user responded (returns response In

aval)

CC quest »

Character string containing question to

be asked

C (with

no ?

at the end,

It Is

added by function)

CC Ival

* Integer variable to receive answer

C (used to pass default If

one Is

available)

CC form =

Character string containing fortran format to

be

C used to format the default contained In

Ival CC

mode *


CC mode *

0, required response (no

default allowed)

C mode <>0,

default allowed

C-

Integer Function 1Iquest(quest,1va1,form,mode)

Character quest*(*),form*(*),rstr2*30


11quest«0

Iqlen*Itlcn(quest)

Write

(rs

trZ.fo

rmM

val

1rlen-1deblank(rstr2)

If (mode.NE.0) Then

str»

qu

est(1

:Iqle

n)//'

[V/r

str

2(l:1

r1 e

n)//'3

?'

1slen-1qlen+1rlen+4

Else

str=quest(1:Iqlen)//'?'

Islen*1qlen+l

End If

Write (form2,105)Islen

105 Format (Mx , a ', 1

3,',$)')

13 Write (6,form2)str

Read (5,110)ans

110 Format (a30)

* » O/

la Ten* Ideblank ( a

ns )

If ( 1alen.NE.jBf)

Then

If (ans.EQ. '//' )

Then

I Iquest--!

Else

1 1quest-l

Read (ans(lt1alen),120,err*25)1val

120

Format

( 1 10)End If

Else

If (mode.EQ.0)Go To 13

End If

Return

C couldn't decode

25 Continue

Write (6,130)

130 Format ('

Please answer again,

I expect a

number.')

Go To 13

End

C +I*C

Initial

- Initializes the variables used

In running POLYGON.

C-

£ **************************************************************

Subroutine Initial

Common /commands/nmax ,eps 1 1 n ,del 1 n , d

el out

Common /max/nptmax

Common /mlsc/ncol ,nrow,f1rst ,ntop, If I

rst

Common /zoom/ 1 z

oom, Izval , n

zoom, ncml nz ( 5

),ncmaxz(5),nrm1nz(5),

&nrmaxz( 5 )


CC -

Initialize the maximum number of polygons (nmax), the maximum

C number of

points

In each polygon (nptmax), and the starting

C number of polygons (ntotal).

Cnmax* 100

nptmax= 100

ntotal-0

CC -

Initialize variables used In

drawing the grid and polygons

C on the terminal screen.

CCall Intscr

CC -

Initialize the variables stored In

the original common block

CCall Intorg

CC -

Initializes the calc common block

CCall Intcal

CC -

Initialize flags used In

program

CCall Intflg

CC -

Initialize the zoom stack and pointers.

C1zoom=0

1zval=0

Cal 1

Intzom

C C -

Initialize the location arrays for the polygons.

Q7

? f

cCall Intloc

CC -

Initialized th« topology structure arrays.

CCall Inttpl

Ca11

i ntnew

CC -

Initialize the labels associated with the value list.

CCall tntlab

CC -

Initialize the parameters

In the parm list.

CCal 1

Intpar

CC -

Initialize the paramters used In

filling a

polygon

CCall Intfll

CReturn

End

C +£ **********************************************************************

C InkJet - Sets an optimal color map for dumping the screen to the

C InkJet plotter.

At present, only ncolors=12 properly map.

CC Author:

Robert W.

Simpson, USGS, Menlo Park, CA, 1984.

C-£ ***********************************************************************

Subroutine 1nkjet(loun1t,ncolors)

CCharacter*100 str(20)

If <ncolors.GE.l.AND.ncolors.LE.13) Then

Cstr(13)-'IJ0007,1000,3165,4110,5245,6006,7090,8218,9003,'//

& ':221,;107,<075,=077,>111,7053,,'

str(12)-'100007,1000,3165,4110,5245,6006,7090,8218,9003,'//

& ':221,;107,<075,=077,>053,,'

str{11)- * 1

00007,1000,3165,4110,5245,6006,7090,8218,9003,'//

& ':107,;075,<077,=053,,'

strt10)='100007,1000,3165,4110,5245,6006,7090,8003,9107,'//

& ':075,;077,<053,,'

str(9)-'100007,1000,3165,4110,5245,6006,7090,8003,9107,'//

& ':077,;053,,'

str < 8 ) =

I00007,1000,3165,4110,5006,6090,7003,8107,9077,'//

& ':053,,

str < 7 ) =

I00007,1000,3110,4006,5090,6003,7107,8077,9053,,'

str(6)« 100007,1000,3110,4006,5090,6003,7107,8077,,'

str(5)- 100007,1000,3006,4090,5003,6107,7077,,'

str(4)- 100007,1000,3006,4090,5003,6077,,'

str (3)- 100007,1000,3006,4003,5077,,'

str (2)- 100007,1000,3006,4077,,'

str(l)= 100007,1000,3006,,'

Call rdeblank(str(ncolor s),str(ncolors)

fleng)

Cal1 esccom(str(ncolors)(1:leng))

ElsePrint *,'

Subroutine INKOET cannot handle ncolors',ncolors

End If

CReturn

End

C + C

98

C intcal

- Initiallzse the calc common block.

C-r **************************************************************

Subroutine Intcal

Common /ca1c/ncont,cmin,cdel

Cncont=J0fcm1n-J0.J0cdel'0.0

CReturn

End

C +I*C

Intfll

- Initializes the parameters used in

pattern filling

C a

polygon.

i**********

Subroutine Intfll

Common /f11 I/open,solId,f11typ

Character open*!,sol1d*l,f1ltyp*l

Copen= *P'

sol1d='0»

f 11typ=»1'

CReturn

End

C + CC

Intflg -

Initializes flags used

In program POLYGON.

C-

Subroutlne Intflg

Common /flags/mcflag

Common /model/mdflag

Character mcflag*2

Cmcf1ag='N'

mdf1ag=0

CReturn

End

C +

C Intlab -

Initializes the labels associated with the value

C arrays.

******!

Su

bro

utin

e

intla

bC

omm

on /la

bels

/lab

el

Ch

ara

cte

r 1

ab

eK

10

)*15

C

nla

b=

lJ&

Oo

10

I=

l,n1ab

labeK 1 )

«'UNASSIGNED»

10 Continue

CReturn

End

C +

C Intloc -

INiTialize Location

- Initializes the location

** //

C and boundary arrays.

c-r *************************************************************

Subroutine Intloc

Common /commands/nmax,eps1 In,del1n,delout

Common /junk/ngbtop,jnktop(100),ngbloc,jnkloc(100)

CDo

10 npoly*l,nmax

Call delloc<npoly,Itest)

10 Continue

Cngbloc=0

Do 20

j= 1 ,nmaxjnkloc(j)»0

20 Continue

CReturn

End

C +wC

Intnew -

Initializes the working topology array

In the newtopo

C common block.

C-\*

Subroutine Intnew

Common /newtopo/1nfnewt 100),1upnew(100),<dwnew( 100),

&1Ifnew(100),<rtnew(100)

Common /commands/nmax,eps1 In,del 1

n,delout

CDo

10 1*1,nmax

1nfnew(1)=0

1upnew(1)=0

1dwnew(1)=0

1 Ifnewt 1)=01rtnew(1)=0

10 Continue

CReturn

End C +

C Intorg

- Initializes the variables stored

In the

C common block.

C-£ **************************************************************

Subroutine Intorg

Common /orlglnal/lwcorg,Jwcorg,nxorgp,nyorgp

C1wcorg=0

Jwcorg=0

nxorgp=0

nyorgp=0

CReturn

End C +

C Intpar

- Initializes the parameters

In the parm list.

C-£ **************************************************************

Subroutine Intpar

Common /Parameter/parm<100,10)

Common /commands/nmax,eps1 In,del 1n,delout

CDo 10 1=1,nmax

00

Do 10

J = l ,10 parml 1 , J )

=0.0

10 Continue

Return

End

*************************************************************

Intply -

Initializes the POLYLOC common block, used by most of

the editing and special function routines.

:********** ***************************************************

Subroutine Intply

Common /max/nptmax

Common Xpo1y1oc/npt1oc,xloc( 100) ,y1oc( 100)

nptloc»0

Do 10

1=1 ,nptmax

x1oc( 1 )

»0.0

yloc( 1 )

=0.0

10 Continue

Return

End

i* ** iIntscr

- Initializes the parameters used

In drawing the grid

and polygons on the screen.

t***********

Subroutine Intscr

Common /gr Id s

pecs/ Id , p

gm.nc ,nr,nz,xo,dx,yo,dy

Common /sca1e/xsc,ysc,xstart,ystart,x1n1t,y1n1t

Common /subgrld/lcmln.l cmax , I

rmln, 1 r

max , nctnl n , n

cmax ,nrm1n,nrmax

Common /sub screen/ xscrn( 2 ) ,

yscrn( 2 ) , x

grd ( 2 ) ,

ygrd( 2)

Common /commands/nmax , e

ps 1 In, d

el 1 n ,

de1out

Character 1d*56 ,pgm*8 , z

mf lag*!

x1n1t=100.0

ylnlt-100.0

XSC*

S0.0

ysc»0.0

xstart=l

ystart= 1

1cm1n=l

1cmax=nc

1 rml n= 1 1 rmax^nr

ncm 1 n= 1

ncmax=nc

nrm 1 n= 1

nrmax=nr

xscrn( 1 )a

0.0

yscrn< 1 )

*0.0

xscrn(2)=4000.0

yscrn<2>=3000.0

xgrd< 1 )

=0.0

ygrd(l>=0.0

xgrd(2)=0.0

101

ygrd(2)*0.0

Cepsl ln«»l .

0e-10

del1n=25.0

de1outM0.0

CReturn

End

C+

CC Inttmp

- Initializes the TEMP array, used by most of the editing

C and special function routines.

***********<

Subroutine Inttmp

Common /max/nptmax

Common /temp/ntemp ,xtemp(100),ytemp<100)

ntemp«0

Do 10

1-l,nptmax

xtemp(1)«0.0

ytemp(1)»0.0

10 Continue

Return

End

***

Inttpl

- INITIal ToPoLogy -

Initializes the topology arrays

and the garbage collector Jnktop.

***********

Subroutine Inttpl


&11eft(100),1r1ght(100)


Common /commands/nmax,eps1 In, d

elIn,del out

Cngbtop=0

Do 10

npoly*!,nmax

C1nfo(npoly)=0

1 upper(npoly)«0

1down(npoly)=0

11eft(npoly)«0

1r1ght(npoly)«0

CJnktop(npoly)«0

10 Continue

CReturn

End

C +£ ******************************************************

C Intwrk

- Initializes work grid (wrkgrd) to dval.

k***********************

Subroutine Intwrk(dval)

Common /work/wrkgrd(250000)

Do 10

1-1,250000

wrkgrd<1)=dval

10 Continue

occcccccccccccc-c

Return

End

Intzom -

Initializes the zoom stacks

nrmaxz for the zoom command.

********************

ncm 1 nz , n

cmaxz , n

rml nz ,

Izoom

nzoom

Izval

Flag for zoom state

1 «

Yes, program Is

0 «

No, program Is

of program

In zoomed state

not In

zoomed state

Pointer to top of zoom stack, range Is

from 0-5

Pointer used by subroutine unzcom (UNZOOM

COMMAND) to Identify zoom values to use In

recal1 mode.

ft**************************!

Subroutine Intzom

Common /zoom/Izoom,Izval,nzoom,ncm1nz(5),ncmaxz(5),nrminz(5)*

&nrmaxz(5)

Cnzoom«0

Do 20 1-1,5

ncm1nz(1)*0

ncmaxz(1 )»0

nrmlnz(1)»0

nrmaxz(1)*0

20 Continue

CReturn

End

C +£ **************************************************************

C Invers -

Transforms a

coordinate (xo1d,yo1d) from the zoomed

C screen to unzoomed screen coordinates (xnew,ynew).

C-

w

Subroutine 1nvers(xnew,ynew,xold,yold)

Common /subgrld/lcmln,icmax,Irmln,1rmax,ncm1n,ncmax,nrm1n,nrmax

Common /or1gInal/Iwcorg,Jwcorg,nxorgp.nyorgp

Common /scalefacts/1wc0,Jwc0,nxp1x,nyp1x,p1xd1m

Cxorg*1wcorg+(ncmln-1)*nxorgp

yorg*Jwcorg+(nrmln-1)*nyorgp

Cxnew*xorg+(xold-1wc0)*nxorgp/nxp1x

ynew*yorg+(yold-Jwc0)*nyorgp/nyp1x

CReturn

End

C +CCCCCCCCCCCC

IRQUEST

- asks question with real answer

Ireturn m

IRQUEST (quest,rva1,form,mode)

Ireturn *

-1 If

//* was given as response (user wants out)

0 If

no response (user took default)

1 if

user responded (returns response In

aval)

quest =

Character string containing question to be asked

(with no 7

at the end,

It Is

added by function)

rval

= Real variable to receive answer

103

C (used to pass default If

one Is

available)

CC form *

Character string containing fortran format to be

C used to format the default contained In

rval

CC mode *


CC mode *

0, required response (no default allowed)

C mode <>0, default allowed

C-£

*********************************************

Integer Function 1rquest(quest,rval.form,mode)

Character quest*(*),form*(*>,rstr2*30


1rquest»0

Iqlen*Itlen(quest)

Write (rstr2,form)rwal

1rlen*1deb1ank(rstr2)

If (mode.NE.0) Then

str-quest(ltIqlen)//*

C *//rstr2(I:1r1en)//*]?*

1slen*1qlen+1rlen+4

Else

str-quest(1:Iqlen)//*?*

Islen*lqlen+1

End If

Write (form2,105)1slen

105 Format (*(x,a*,13,*,S)*)

13 Write (6,form2)str

Read (5.110)ans

110 Format (a30)

lalen*1deblank(ans )

If (1alen.NE.0) Then

If (ans.EQ.*//') Then

Irquest*-!

Else

1 rquest=1

Read (ans(1:lalen),120,err-25 )rval

120

Format (f20.0)

End If

Else

If (mode.EQ.0)Go To 13

End If

Return

C couldn't decode

25Continue

Write (6.130)

130

C +CCCCCCCC-c

**<

Format

( *Go To 13

End

ITLEN

Ireturn *

Ireturn

str Ing

***********

Please

Gives

ITLEN

- the

answer

length

(string)

length

aga 1 n ,

of

of«

string to have

*****************

I

str Ing

the

*m expecting

without

str Ingtral 1

***<»* *

Ing

****

tral

without

a number

. * )

1 Ing blanks

tra 1 1 1 ng

blanks

blanks removed from

*****iInteger Function 1tlen(strIng)

Character strlngM*)

1slen(strIng)

10 Continue

" 1 /)/

If (str 1ng( 1 t 1 ) .NE.

)Go To 15

! vn

1-1-1If

{ 1 .GT.0)Go To 10

15 Continue

ltlen-1

Return

End

c+cccccc-c

*****************************

1 Incur - Returns the world coordinates of a

line

( xl Ine, yl 1 ne) entered using the Envision cross-hair cursor keys.

The parameters are explained In

LINCUR.INF.

**************************************************************

Sub rout 1 n

e 11ncur(xi1ne,yl1ne,nl1ne,xl,yl,x2,y2,1 set, nbrpts ,

Anptmax , 1 t

est )

Dlinens Ion xl 1ne( n

ptmax ) ,yl 1ne( n

ptmax )

Character ans*l

Cal 1

curon

1=0

1test«0

nl 1ne=0

ntota 1 =

nbrpts

If Mtest.EQ.0) Then

10

Continue

Call gtpnt(ans, x ,y )

If {ans.EQ. »e» .

OR.ans.EO. 'f ' )

Then

If (ntotal .EG. (

nptmax-1 > .

AND. ans.EQ. »e')

Then

Print *,*

Last point, only (f/q) are allowed answers

Else1-1 + 1ntota 1 »

ntota 1+1

xl 1ne( 1 ) = x yl 1 ne( 1 )=y Call drwpnt(x,y)

If ( 1 .EQ. 1 .AND. ( 1

set.EQ.0.0R. Iset.EO. 1 ) )Cal 1

&

drwl 1n( x 1 , yl , x ,y >

If (I.GT.l)Call drwl 1n(xl 1ne( 1-1 ) ,yl 1ne< 1-1 ) ,

x,y)

If (ans.EQ. 'f .OR. n

tota 1 .EO. n

ptmax) Then

nl 1ne=1 1test=l

If ( I

set.EO. 0. OR. 1

set.EQ.2)Cal 1

drwl 1n( x , y , x2 ,y2 )

End If

End If

Else If

{ans.EQ. *h' )

Then

Call hlpent

Else If

(ans.EQ. 'q')

Then

nl 1ne«1

Itest--!

Else Call

errmsg

End If

If (ntota1.EQ.(nptmax-1).AND.1test.EQ.0)

Print *,!,' coordinates entered, only

End If

If (1.GT.nptmax)1test»-l


End If

Then

one more

allowed *

105

Cal1 curoff

Return

End

C+

£ ft*****!

C llnmou - Returns the world coordinates of a

line (x11ne,y11ne)

C entered using the Envision mouse.

CC The parameters are explained

In LINMOU.INF.

C-£ **************************************************************

Subroutine 11nmou(x1Ine,yl1ne,n11ne,x1,y1,x2,y2,Iset,nbrpts,

&nptmax,Itest)

DlmensIon xl1ne(nptmax),yl1ne(nptmax)

Character ans*l

CCall curon

Call softky('l')

Call setmou

Cal1 loadmou

C1test-0

1-0

nl1ne«0

ntotal»nbrpts


10 Continue

Call getmoudnode,1x,1y)

x-floatt1x)

y»float(1y)

If (mode.EG.1.OR.mode.EQ.2) Then

If (mode.EQ.1.AND.ntotal.EQ.<nptmax-1» Then

Print *,'

Last point, only button 2

or buttons 243 are

& a 11 o

wed'

Else1-1 + 1ntota1«ntota1+1

xl1ne<1) = x

y11ne(1)=y

Call drwpnt(x,y)

If (1.EQ.1.AND.(Iset.EQ.0.OR.Iset.EQ.1))Call

&

drwl1n(xl,yl,x,y)

If (I.GT.l)Call drwl1n(xl1ne(1-1>,yl1ne(1-1),x,y)

If (mode.EQ.2.OR.ntotal.EQ.nptmax) Then

n11ne»1

1test=l

If {Iset.EQ.0.OR.Iset.EQ.2>Call drwl1n(x,y,x2,y2)

End If

End If

CElse If

(mode.EQ.3) Then

Call hlpmou

CElse If

(mode.EQ.23) Then

nl1ne»1

1test--l

CElseCal1 errmsg

CEnd If

If (ntotal .EQ. (

nptmax-1 ) .AND. I

test.EQ.0) Then

j t\

*. Print *,1,' coordinates entered, only one more allowed*

| UQ

End If

If (1.GT.nptmax)1test=-l


End If

CCall softky('0'>

Cal1 curoff

Return

End

C +

CC loadmou

- Loads the mouse soft key button definitions within

C the terminals key translation table.

C-

£ **************************************************************

Subroutine loadmou

Character esc*l

Cesc*char(27 >

Cal1 esccomC'CA*//esc//*Ry0107\l\2\3\4\5\6\7')

CReturn

End

C +£ *************************************************************

C loccur -

LOCate CURsor - Return world coordinates (1x0,1y0)

C of Envision cross-hair cursor.

C-C

*********************** t*************************************

Subroutine loccur(1x0,1y0)

CCall esccom(*YC'>

Read (5,20)1x0,1y0

20 Format (2z4)

CReturn

End

C +

C magmod - Writes out a MAGPOLY model using the POLYGON model

C information and user entered responses.

C-C **************************************************************

Subroutine magmod(1test)


Common /topology/1nfo<100),1upper(100),Idownl100),11eft(100),

&1r1ght(100)



Common /gr1dspecs/1d,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,b1

Common /orIglnal/Iwcorg,Jwcorg.nxorgp,nyorgp

Character 1dplot*40,If 1le*50,If 11e2*50,quest*80,1fmt*80,

&1d*56,pgm*8,comf11*80,ans*2,ans2*2,name*8,un1x*4,un1z*4

namel1st/parms/Iplotr,Ibody,If 11e,If 11e2,Isqs,datum,xsca1e,

&dc,un1x,uniz,name,height,Ifmt,Idplot,lobs,Icalc,1 res,naxcol

C1plotr=9

naxcol=130

1body=0

1obs=0

1calc=0

1res»0

1dplot='

'1f11e=*

'1f11e2='

'107

1sqs»0

xscale*0.

dc-0.

unlx-'kllm'

un 1z*'f eet '

name*'gr fdded*

he1ght=0.

- Ask for

name of

file containing fteldpolnt Information.

1test»lquest"' Name of

file containing fleldpotnt Information'

1val»1aquest( quest, If lie, ' (a50) * ,0)

If ( Ival .EQ.-l )Go

To 100

- Name (type of

data re*d In

from If lie).

1test»0

Do 40 wh11e( 1test.EQ.0)

quest-' Type of

data

In fteldpotnt file (enter H

for help)'

Ival" taquest( quest, name, ' (a8 ) ' , -8 )

If (named tl).EQ. 'G' )

Then

name9 'gr t

dded '

helght-0.0

Write (6,45)

45 Format (2x, '

Height of

fteldpont grid above the same datum that')

quest*'

Is used to reference the body heights'

1va1»1r quest (quest .height, ' (

e!6.8) ' ,16)

ttest-1If

( Ival .EQ.-l ) 1test»-l

Else If

(name.EQ. 'H' )

Then

Call hlpg2

Else If

( Ival. EQ.-l) Then

Itest--! Else

- Ask for

format type of

data .

1test2-0

Do 25

wh11e( ltestZ.EQ.0)

quest*' Enter format to

use when reading In

your file*

1va1*1aquest( quest, tfmt, * (a 80) ' ,0)

If ( Ival .EQ.-l >

Then

1test«-l

1test2=-l

Else If

( Ifmt.NE. '

' ) Then

ttest-1 1test2-l

ElseCal 1

errmsg

End If

25 End Do

End If

40 End Do

If ( Itest. EQ.-l )Go

To 100

- Ask for

the name of

standard grid containing the heights of

f leldpolnts .

quest*' Name of

standard grid containing heights of

fleldpolnts*

4 A Q

1val»1aquest(quest, If 1 Ie2, ' (a50) ' ,0)

*~ tVO

If ( 1

val.EQ.-l)Go To 100

cC - Ask for print out Identifier.

Cquest"* Identifier for printer output'

1 val- laquesKquest, 1 d

p lot, ' (a 40) * ,0)

If (Ival.EQ.-l>Go To 100

CC - Ask

If constant should be added to calculated anomalies.

Cltest-0

Do 20 whllelltest.EQ.0)

quest-* Add a

constant to the calculated anomalies (y/n/q)'

1 val* 1aquest(quest,ans,*(a2)',0)

CIf

(ans.EQ.'V) Then

quest-' Constant to be added*

1val»1rquest(quest.datum,Mel6.8)',16)

ltest-1

If (Ival.EQ.-l)1test--l

Else If

(ans.EQ.*Q*.OR.Ival.EQ.-l) Then

1test»-l

Else If

(ans.EQ.'N*) Then

1test-l

datum=0.0

ElseCall errmsg

End If

20 End Do


CC -

Ask Isqs determination.

C1test»0

Do 30 wh(le(Itest.EQ.0)

quest"' Least-squares comparison/read observed values

& (y/n/h/q)'

1 va1 = laquest(quest,ans2,'(a2 > *,0)

CIf

(ansZ.EQ.'Y'> Then

1testZ=0

Do 35

wh11e(ItestZ.EQ.0)

lsqs-0

quest-' What value for LSQS (0-7 Integer, //

to quit)'

1val=11quest(quest,Isqs,'(12)',-2>

CIf

(Isqs.GE.0.AND.lsqs.LE.7) Then

1test2«l

1test«l

Else If

(Ival.EQ.-l) Then

ltestZ«-l

1test--l

ElseCal1 errmsg

End If

35 End Do

Else If

(ansZ.EQ.'N'> Then

lsqs=0

ltest=l

Else If

(ansZ.EQ.'H'> Then

Cal1 hlpmgl

Else If

(ansZ.EQ.'Q'.OR. Ival .

EQ.-l )

Then

ltest=-l

ElseCa11 errmsg

KILFM Then

METR') Then

KILMM Then

Q'.OR.Ival.EQ.-l) Then

End If

30 End Do



x&y directions.

C1test-0

Do 50 whlle(Itest.EG.0)

un1x«'KILM*

quest-' Units In

x&y direction <FEET/KILF/MILE/METR/KILM/H/Q)'

Ival=(aquest(quest,un1x,'(a4)',-4)

C1test-lIf

(unlx.EG.'FEET*) Then

un1x»'feet'

Else If

(unlx.EQ.'MILE*) Then

un1x«'mile*

Else If

(unlx.EQ

unlx-'kl If

Else If

(unlx.EQ

unlx-'metr *

Else If

(unlx.EQ

unlx-'kl1m*

Else If

(unlx.EQ.'H') Then

Call hlpg3

1test*0

Else If

(unlx.EQ

1test=-l

ElseCa11 errmsg

1test-0

End If

50 End Do

If ( I

test.EQ.-l)Go To 100

CC -

Ask for units In

z direction (height).

C1test=0

Do 60 whlle(Itest.EQ.0)

unlz-'FEET*

quest*' Units In

z direction (FEET/KILF/MILE/METR/KILM/H/Q)'

1va1=laquest(quest,un1z,'(a4)',-4)

C1test=l

If (unlz.EQ.'FEET') Then

unlz-'feet*

Else If

(unlz.EQ.'MILE') Then

unlz«'mlle*

Else If

(unlz.EQ.'KILF* )

Then

unlz-'kl If

Else If

(unlz.EQ.'METR') Then

un

1z*'m

etr'

Els

e If

(u

nlz

.EQ

.'KIL

M')

Th

en

un

1z=

'k11m

*E

lse If

(u

nlz

.EQ

Call

hlp

g3

1te

st=

0E

lse

If

(un

lz.E

Qit

es

f-1

E

lseCal1 errmsg

1test=0

End If

60 End Do

H*) Then

Q*.OR.Ival.EQ.-l) Then

no


CC - Ask for print switch Information.

C1test-0

Do 65 whlle(Itest.EQ.0)

If lag=0

quest*' Print switch for body Information (1/0)'

1va1~11quest(quest,If 1ag, (11)',1)

CIf

( Iwal.EQ.-l) Then

1test--l

Else If

( Iflag.EQ.0.0R.Iflag.EQ.1) Then

ltest-1

ElseCal1 errmsg

End If

65 End Do

If (1test.LT.0)Go To 100

CC - Ask which parm from the parm arrays to use when creating

C

this model.

CCall askmvlHone, Itwo, 1 t

hree, If o

ur , If 1 v

e, 1s1x, 1 t

est)


CC -

Ask for the name to call this MAGPOLY file (comfll)

C70 Continue

quest*' Name to call command file to run MAGPOLY'

1val»1aquest(quest,comf11,'(a80)',0)

If ( I

wal.EQ.-l)Go To 100

If (coinf 1

1.EQ. '

')Go To 70

CC - Open the model file and write out the model.

COpen (11,f1le*comf11.status*'new',carr1agecontrol *'11st*)

Write (11,nml=parms)

Call fndtop(ntop)

next*ntop

1test*0

delxcn=dx/nxorgp

delycn=dy/nyorgp

Do 150 wh1le(Itest.EQ.0)

ngon«next

npo1y«Info{ngon)



Do 120 1-1,nbrpts

xpoly(1)°xo+(xscr(npoly,1)-1wcorg)*delxcn

ypoly(1)»yo+(yscr(npoly,1)-Jwcorg)*delycn

120

Continue

CC -

Find the handedness of the polygon

C gamma

> 0.0

* polygon

Is counter-clockwise

C gamma

< 0.0

= polygon Is

clockwise

CCa11 tota1t(gamma,xpo1y,ypo1y,nbrpts)

CIf

(gamma.GT.0) Then

nstart»nbrpts

441

nend=l

** 111

1step=-l

Else

nstart»l

nend^nbrpts

lstep-1 End

If CC

- If

the body has

a parent, need to determine If

the parent-body/

C current body over! p.

C1up»1 u

pper(ngon)

If ( 1up.GT.J0T)

Then

nplyup*1nfo(1 up)

Cpartop»parm(nplyup,lone)

parbot»parm(nplyup,Itwo)

bodtopaparm(npoly,lone)

bodbot*parm(npoly,Itwo)

CC - We need only remove a

slab If

the parent body and current body

C overlap

In the z direction (height).

CIf

(((bodtop.LE.partop).AND.(bodbot.GE.parbot)).OR.

& ((bodtop.GT.partop).AND.(bodbot.LT.partop)).OR.

& ((bodtop.GT.parbot).AND.(bodbot.LT.parbot))) Then

CIf

{bodtop.LE.partop) Then

ztop-amlnl{bodtop,partop)

Elseztop=partop

End If

CIf

{bodbot.GE.parbot) Then

zbot-amaxl(bodbot,parbot)

Elsezbot=parbot

End If

CC - Write out the slab to be

removed.

CWrite {ll,*)nbrpts,1flag,-parm(nplyup,1 three),

&parm(nplyup,Ifour),parm(nplyup,iflve),parm(nplyup,Is1x),ztop,zbot

Write {11,*){xpoly{1),ypoly{1>,1=nstart,nend,Istep)

End If

End If

Write {11,*)

nbrpts,If lag,parm(npoly,1 three>,

& parm(npoly,1four),parm(npoly,If 1ve),parm(npoly,Isix),

& parm(npoly,lone),parm(npoly,1 two)

WrIte {11,*){xpoly(11),ypoly{11),11=nstart,nend,Istep)

End If

CC - Get next polygon

CCall

walk(next,ngon,ItestZ)

If {next.EQ.0.0R.1 test2.LE.0)

1test=l 150

End Do

Close (11)

C100

Continue

Return

End C +

C mod In

- MODel INput - Asks for

the name of

the model, clears

C the model arrays and reads

In the model.

C-

Subroutine modln(lest)



&11eft(100),1r1ght(100)


Common /box/xmlnbx(100),xmaxbx(100),ym1nbx(100),ymaxbxf100)

Common /names/grdnam,modnam,modgrd

Common /mlsc/ncol,nrow,f1r st,ntop

Common /commands/nmax,eps1 In.del 1n,del out


Character f 1

rst*1,modgrd*80,grdnam*80,modnam*80

C10 Continue

CC - Ask for the name of the model

CCall askmd1(modnam,1 test)

If (1test.EQ.-l.OR.1test.EQ.0)Go To 100

CC - Clear model arrays for reading

CCall Intloc

Call Inttpl

Cal1 Intnew

CC - Read In

the model

CCall readmdtItest)


Cal1 oldnew

mdflag= 1

CCall fndtop(ntop)

1test=0

1«1ncount=0

Do 50 whlle(Itest.EQ.0.AND.1.GE.1.AND.1.LE.nmax)

npoly

55 Inf o( 1 >

If (npoly.GT.0) Then


Do 40 J*l.nbrpts

xpoly(J)=xscr(npoly,J)

ypo1y(J)=yscr(npoly,J)

40

Continue

Call fndbbx(xm1n,xmax,ym1n,ymax,xpoly,ypoly,nbrpts,del out)

xm1nbx(npoly)=xm1n

xmaxbx(npoly)*xmax

ym1nbx(npo1y)=ym1n

ymaxbx(npoly)=ymax

Call fndbpl(npoly,Itest)

1test*0

ncount=ncount+l

If (ncount.EQ.ntotal)1test=l

End If

1*1 + 1 50 End Do

C100 Continue

Return

End

C+

\*C modout -

MODel OUTput

- Asks for the name of the model and

C writes 1t

out.

C-£

Subroutine modout<Itest)


Character grdnam*80,modnam*80,modgrd*80

CC -

Ask for the name of the model

CCall askmd1(modnam Itest)

If <Itest.EQ.-l.OR.Itest.EQ.0)Go To 100

CC - Write out the model

CCal1 wrtmod<Itest)

100 Continue

Return

End

C +

C modpnt -

Determines the corner number of a

polygon picked.

C-

£ *************************************************************

Subroutine modpnt(ncorn,d1st,x,y,ans,npoly,mcur)

Dimension xply<100),yply(100)

Common /screenloc/ntota1,numply(100),xscr(100,100),yscr{100,100)

Common /zoom/Izoom,Izva1,nzoom,ncm1nz< 5),ncmaxz(5),nrm1nz(5),

inrmaxz(5)

Common /commands/nmax,eps1 In,del 1n,delout

Character mcur*2,ans*2

Cnbrpts=numply(npoly)


ans='N'

Do 40 whlle(ans.EQ.'N')

Call hlpcpl


If <1err2.GE.l) Then

If (1zoom.EQ.1)Cal1 1nvers(x,y,x,y)

Do 35

k = l,nbrpts

xply(k)=xscr<npoly,k)

yply(k)

syscr(npoly,k)

35 Continue

1con=l

Cal1 clspnt(ncorn,d1st,x,y,xply,yply,nbrpts,del out,Icon)

If (ncorn.EQ.0) Then

Call wrtmsg(* Could not find corner near your

& point...try again')

Elseans-'Y'

End If

Else If

(1err2.EQ.-l) Then

ans-'O'

End If

40

End Do

ElseCall wrtmsg(' Polygon number passed to MODPNT has no corners')

ans='Q'

End If

CReturn

End C + C

114

C mouexm - MOUse Execution Mode -

Selects Execution mode for

C Envision mouse, (0=Point mode,1=Mu1tIple mode).

C-

Subroutlne mouexm(mode)

Character mode*l,com*3

Ccom**IZ'//mode

Ca11 esccom(com)

CReturn

End

[***!

C moulln - MOUse LI N

ear -

Places Envision mouse In

linear res-

C ponse mode.

C-C

Subroutine moulln

CCall esccom('IY')

CReturn

End

C + CC

mousop

- MOUse Suspend OPerattons -

Suspends mouse operation

C until linear or

logarithmic response mode Is

re-

C selected.

C-V

Subroutine mousop

CCall esccom('IX')

CReturn

End

C movcur

- Moves the graphics cross-hair cursor to world coordinates

C ( 1

x,ly).

C-Q ***************************************************************

Subroutine movcur(1x,ly)

Character wcbp*5,com*6

Ccom='P'//wcbpl1x,ly)

Ca 11 esccomt com)

CReturn

End

C +

C movply - Allows the moving of a

polygon from one location to

C another part of the screen.

C-

Subroutine movply(1 test)

Dimension parstore(10)


&11eft(100),1r1ght(100)

Common /screenloc/ntota 1,numply(100),xscr(100,100),yscr(100,100)


Common /poly1oc/nptloc,xloc(100),yloc(100)

Common /temp/ntemp,xtempC100),ytemp(100)

Common /f lags/mcflag,votfIg

Common /Junk/ngbtop,jnktop(100),ngbloc,Jnkloc(100)

Common /zoom/Izoom,Izva 1,nzoom,ncm1nz(5),ncmaxz(5),nrm1nz(5),

Anrmaxz(5)

Common /grldspecs/ Id,pgm,nc,nr,nz,xo,dx,yo,dy,1proj,cm,bl

Common /scale/ xsc,ysc,xstart

fystart,x1n1t,y1nIt

Common /original/ 1wcorg,Jwcorg,nxorgp,nyorgp


Common /commands/nmax, eps11n,delIn.delout

Common /max/nptmax

Common /state/lflast,IftIn,Iftout.ndpstn,lup


Common /f 111/open,sol Id,f11typ

Ch

ara

cte

r o

pen

*l , so

l IdM

,f I ltyp

*l , p

i yclr

M , b

lack*! , w

hlte

*l C

hara

cte

r 1

d*5

6,p

gm

*8,v

otflg

*2,m

cfla

g*2

,mc

ur*2

,an

s*2

,an

s2

*2

CC

all

en

hm

sg

C'***

Mo

ve

p

oly

go

n

mo

de

*** )

C

1te

st-0

CC

- Test the number of polygons ntotal, exit If

<»0.

CIf

(ntotal.GT.0) Thjn

CC -


CIf

(mcflag.EQ.*N') Then

Call askmoc(mcur)


1test=-l

Elsemcflag=mcur

End If

Elsemcur^mcflay

End If

CC -

Print help message

CIf

(votf Ig.EQ. 'VMCall hlpmov


found (1test=l), or user

C wants to quit Mtest = -

l).

CDo 10 wh11e<1test.EQ.0)

If lag=0

If (mcur.EQ.'M*.OR.mcur.EQ.*C

f) Then

CC -

Initial the temp arrary.

Ccall 1nttmp

CC -

Let user pick polygon and return npoly,ncorn,x,y.

CCall pckply(npoly,ncorn,x,y,ans,mcur,1err)

CC - Ask If

corner point of polygon picked should be used.

CIf

(ans.EQ.'Y*) Then


Cal1 pckpnt{ncorn,d1st,x

fy,ans2,npoly,mcur)

If <ans2.EQ.'Q') Then

1test=-l

1J6

Go To 20

End If


CCall hlpmvZ


If (terr.EQ.-l) Then

1test--l

Go To 20

End If

CIf

(fzoom.EQ.1> Then

Ca11 1nvers(xnew,ynew,xscnew,yscnew)

Elsexnew»xscnew

ynew*yscnew

End If

CC -

Find the amount that polygon should be moved by (delx.dely).

Cdelx*xnew-x

dely*ynew-y


Cntemp^nbrpts

Do 30 1*1,ntemp

xtemp(1>=xscr(npoly,1)+delx

ytempt1>*yscr(npoly,1)+dely

30

Continue

CC - Test If

polygon will be off of unzoomed grid.

Cxlfunz-xInlt

xrgunz=x1n1t+nc*nxorgp

ybtunz=yIn It

ytpunz*y1n1t+nr*nyorgp

Call testoff(xtemp,ytemp.ntemp,xlfunz,xrgunz,ybtunz,

& ytpunz,Intotal)

If ( I

ntotal.LE.0) Then

If (Intotal.EQ.0) Call wrtmsg(* Error, polygon will

& off of unzoomed grid*)

Go To 20

End If

CC - Store the parameter InformatlIon.

CDo 35

11 = 1, 10par store(11)=parm(npo1y,11)

35 Continue

CC -

Test the new polygon In

the xtemp,ytemp array and fit Into

C the topology structure.

CCall testopo(npoly,1test2 )

If MtestZ.GE.l) Then

npoly2*Info(ndpstn)

Do 40

1 1 1=1,10

parm(npoly2,111)=parstore( 111)

40

Continue

If1ag=l

End If

1test=l

117

20

Continue

If (If l

ag.EG.0) Then

Call setclr(plyclr)

Call self 11(open)

Cal1 drwclp(xloc,yloc,npt1oc,xleft,xrIght,ybot,ytop)

End If

Else If

(ans.EQ.»N') Then

1test»0

Else1test«-l

End If

Call self 11(sol Id)

If (ierr.EQ.-l)1test»-l

Else If

(mcur.EQ.*Q*) Then

1test«-l

End If

10 End Do

ElseCall wrtmsg(*

Sorry no polygons')

1test=-l

End If

CReturn

End

C +

C movpnt - Allows the moving of Individual points of

a polygon.

C-£ *************************************************************

Subroutine movpnt(itest)

Common /topology/1nfo(100),iupper(100),idown(100),

41 left(100),1r1ght(100)






Common /Junk/ngbtop,jnktop(100),ngbloc,jnkloc(100)

Common /zoom/1 zoom,1zva1,nzoom,ncm1nz(5),ncmaxz(5),nrminz(5),

&nrmaxz(5)


Common /commands/nmax,eps1 In,delIn,del out

Common /max/nptmax

Common /colors/plyclr,black,wh ite


Character open*!,solid*!,f1ItypM,plyclr*1,black*!,white*!

Character votflg*2,mcflag*2,mcur*2,ans*2,ans2*2

CCall enhmsgC*** Move point mode *** )

C1test*0

CC - Test the number of polygons ntotal, exit If

<=0.

CIf

(ntotal.GT.0) Then

CC -


CIf

(mcflag.EQ.*N*) Then

Call askmoc(mcur)

If (mcur.EG.'Q') Then

1test=-l

Else

tie

mcflagamcur

End If

Elsemcur=mcflag

End If

CC -

Print help message If

user requested verbose answers.

CIf

(votfIg.EQ.'V) Call

hlpmvp

CC - Start looping until

polygon Is

found (1test=l), or

user

C wants to

quit (1test«-l).

CDo

10 whlle(1test.EQ.0)

Iflag«0

If Iag2=0

If <mcur.EQ.'M'.OR.mcur.EQ.'C') Then

CC -


CCall

Inttmp

CC -

Find polygon, enhance and return npoly,ncorn,x,y.

CCall

pckply(npoly,ncorn,x,y,ans,mcur,lerr)

CC -

Next ask

If corner picked In

pckply (ncorn =

x,y) should be

C used.

CIf

(ans.EQ.'YM Then


Call pckpnt(ncorn,d1st,x,y,ans2,npoly,meur)

If <ans2.EQ.'Q') Then

1test=-l

Go To 20

End If

CC -

Now undraw the connecting lines

to ncorn.

CIf

(ncorn.EQ.l) Then

x1=xscr(npoly,nbrpts)

yls=y

scr(npoly,nbrpts)

x3=xscr(npoly,2)

y3=yscr(npoly,2)

Else If

(r-orn.EQ.nbrpts) Then

xl = xscr(npoly,nbrpts-1 )

yl=yscr(npoly,nbrpts-l )

x3*xscr{npoly,1 )

y3»yscr(npoly,1)

Elsexl»xscr(npoly,ncorn-l )

yl«syscr(npoly,ncorn-l )

x3=xscr{npoly,ncorn+1)

y3*yscr(npoly,ncorn+1)

End If

x2=xscr(npoly,ncorn)

y2=yscr npoly,ncorn)

CIf

(Izoom.EQ.1) Then

Call trans( xl ,yl ,xl ,yl )

^. 4

4 s\

Call trans(x2,y2,x2,y2)

' I

I 7

Call trans(x3,y3,x3,y3)

End If

Call setclr(black)

Call drwl1n<xl,yl,x2,y2)

Call drwl1n(x2,y2,x3,y3)


CCall hlpmvZ

Ca11 retpnt(xscnew,yscnew,meur,Ierr2)


1tesf-l

Go To 20

End If

cc -

If program Is

In zoom state unzoom the screen location,

cIf

(Izoom.EQ.1) Then

Cal1 1nvers{xnew,ynew,xscnew,yscnew)

Elsexnew*xscnew

ynewyscnew

End If

CC -

Draw the connecting lines to the new corner

CCall setclr(whlte)

Call drwl1n(x1,yl,xscnew,yscnew)

Call drwl1n(xscnew,yscnew,x3,y3)


Cntemp=nbrpts

Do 30 1=1,ntemp

xtemp(1)=xscr(npoly,1)

ytemp(1)=yscr{npoly,1)

30

Continue

xtemp(ncorn > = x

new

ytemp(ncorn)=ynew

CC -

Test the new polygon

In xtemp,ytemp array to see If

It Is

C self-crossing.

CCal1 selftest(1flag3,ns1del,ns1de2,xtemp,ytemp,ntemp)

If (Iflag3.EQ.-l) Then

Call wrtmsg{' Error, polygon

Is self-cross 1ng.')

IfIag2=l

Go To 20

End If

CC -

Test the new polygon

In the xtemp,ytemp array and fit Into

C the topology structure.

CCall testopo(npoly,1test2)

If (1test2 GE.0) Then

Iflag=l

ElseIfIag2=l

End If

1test=l

C20

Continue


Call setclr(plyclr )

Call setfll(open)

Call drwclp(xloc,yloc,nptloc,xleft,xrIght,ybot,ytop)

If (1flagZ.EQ.1> Then

Call setclr(black)

Call drwlln(xl,yl,xscnew,yscnew)

Call drwl1n(xscnew,yscnew,x3,y3)

CaU setclrtplyclr)

End If

End If

Else If

(ans.EQ. *NM Then

ltest«0

Else1test«-l

End If

CaU self 11 (sol fd)

If (lerr.EQ.-l)1test=-l

Else If

(mcur.EQ.'Q*) Then

ltest»-l

End If

10 End Do

Elsecall wrtmsg(' Sorry, no polygons')

1test=-l

End If

Return

End

r ***i

msgall

- Message displayed at user's terminal giving Info about

assigning values to a

polygon.

**************************************************************

Subroutine msgall

Write (6,10)

10 Format (/,'

You will now be asked to assign parameters to the

& polygon drawn In

white.',/,'

Enter a

carriage return <CR> to

& use the default answer

In brackets [].',/)

Return

End

r***<

C msgclr

- Prints message at user's terminal on first time Into

C subroutine CLRSGD (Color Standard Grid).

C-Q **************************************************************

Subroutine msgclr

CWrite (6,10)

10 Format (/,'

To draw the grid 1n

color

I first need some',

&' facts about It' )

CReturn

End

C +

C msgent -

Prints message on user's terminal on how to use the

C a

screen coordinate.

C-Q *********************** Jr***«**********************************

Subroutine msgent

CWrite (6,30)

30 Format (/,'

To enter a

polygon use the cursor keys to position',

121

A/,' the

A//,' A/,* A/, * A/,*

Return

End

cross-hairs.

Then type:

e * enter

the current

f *

finish drawing the

h »

help, repeats this

q -

quit' )

cross-hair location*

polygon (and e)',

help message*,

C +CCCC-CC +CCCC-C

msggvl

- Message explaining Information that subroutine askgvl

asks user for.

***********

Subroutine msggvl

Write (6,10)

10 Format (/,*

You will now enter the numbers of the labels*

A* assigned to the following parameters:*,/,

A/,*

(1) Height of Top of body*,

A/,*

(2) Height of

Bottom of body*,

A/,*

(3) Density Contrast of body',/)

Return

End

[***!

msglab -

Displays on the user's terminal the labels currently

assigned to the parameter arrays parm*.

Subroutine msglab


Character Iabe1<10)*15

- Display the current labels.

Call wrtmsgC* The parameter labels are:*)

Do 8

1=1,10

Write (6,12)1,label( 1 )

12 Format (*

Label ',12,*: *,a!5)

8 Continue

Return

EndC +CCCC-C

msgmol

- MeSsaGe MOuse

1 -

First help message on using the

Envision mouse.

Subroutine msgmol

Write (6,10)

10 Format (//,

A* When

holding the

mouse In

the right

hand the

A* buttons

are numbered*,/,* from

left to

right.mouse'

Button

1 Is*

C + C C C

A* actuated by the Index finger',/,' and button 3

is actuated by*

A' the ring finger.',/)

ReturnEnd

!*************** *********************************************

msgmo2

- MeSsaGe MOuse 2

- Second help message on using the

Envision mouse.

122

c- c

Subroutine msgmoZ

CWrite (6,10)

10 Format (/,'

Use the mouse to position the cross-hair cursor*,

A/,' to the desired location on the screen, then type:')

CReturn

End

C +£ *************************************************************

C msgmo3 - MeSsaGe MOuse 3

- Third help message on using the

C Envision mouse.

C-

W

Subroutine msgmo3

CWrite (6,10)

10 Format (/,'

KEY-KEYBOARD, MOUSE-MOUSE BUTTON',

&/,'

(KEY)

(MOUSE)',

&/,'

e

1 =*

Enter cross-hair cursor screen',

&* location',

&/,'

f 2

* Enter screen location and finish',

&' drawing polygon',

&/,'

(In ADD polygon mode only)',

&/,*

h 3

= Help message',

&/,'

q 2

& 3

« Quit*,/)

CReturn

End

C +

C msgmvl

- Message explaining Information that subroutine askmvl

C asks user for.

C-

£ **************************************************************

Subroutine msgmvl

CWrite (6.10)

10 Format (/,'

You will now enter the numbers of the labels',

&' assigned to the following parameters:',/,

&//,'

(1) Height of

Top of body',

&/,'

(2) Height of Bottom of body',

&/,'

(3) Volume magnetic susceptibility (emuXl00000)',

&/,'

(4) Remanent or

total volume magnetization (emuX100000)'

&,&/,'

(5) Declination of remanent or

total magnetization',

&' In

degrees, measured',/,

&* positive clockwise from the direction of the y-axls*,

&/,'

(6) Inclination of remanent or total magnetization',

&' In

degrees, measured',/,

&' positive downward from the horizontal plane',/)

CReturn

End

C+

Q **************************************************************

C msgspZ -

Prints message at user's terminal about selecting the

C corner of the polygon to start adding points from.

C-

Q **************************************************************

Subroutine msgspZ

Write (6,10)

10 Format (/,'

Now enter one of the endpolnts of this side to start*

*,&' drawing from and then',/,' enter the locatlon(s) of the',

&' pofnt(s) to be added.',/)

Return

End

C rasgspm

- MeSsaGe Single Point Mode -

Displays enhanced mess-

C age at user's terminal on entry to single point mode

C using Envision terminal.

C-

CSubroutine msgspm

CCall envbcl('l')

Write (6,10)

10 Format (/,4x,**** Enter screen location ***

')Call envbcK '0' )

CReturn

End

C +

C msgspt -

Prints message at user's terminal about selecting

C the corner of polygon to use.

C-

w

Subroutine msgspt

CWrite (6,10)

10 Format (/,'

Position the cross-hair cursor to the side of the',

&* polygon where po1nt(s)',/,* will be added and enter this*,

&' side using the mouse or keyboard keys.',/)

CReturn

End

subroutine msgstd

cwr1te(6,10)

10 format(/,' You have the option to use a prexlstlng grid',

&

* when writing out*,/,' the standard grid.',/)

creturn

end

C +

C msgstk - Message for zoom stack release.

C-

£ **************************************************************

Subroutine msgstk

CWrite (6,10)

10 Format (/,*

The zoom stack

Is full, there are several ways*,

&* to release (free)',/,' a

space In

the stack.',/)

CReturn

End

124C

msgsub -

Prints message at user's terminal about methods for

C entering the subgrld boundaries In

zoom mode.

C Called by subroutine asktyp (ASK TYPE).

C-r- **************************************************************

Subroutine msg.sub

CWrite (6,10)

10 Format (/,'

The subgrld boundaries may be entered',

&' by one of two methodss',/,

&/,'

1 *

curs r/mouse entered subgrld locations',

&/,'

2 * prompt for locations of subgrld

', &'(ncm1n,ncmax,nrm1n,nrmax)*,

A/,'

0 or

// returns to zoom command level',/)

CReturn

End

C +£ *************************************************************

C msgval

- MeSsaGe paramter

- Prints a message at the user's term-

C

Inal about selecting the paramter to use when reset-

C ting the grid.

C-

£ *************************************************************

Subroutine msgval

CWrite (6,10)

10 Format (/,'

For outputtlng the Denver standard grid, select',

&' the label number of',/,'

a set of parameters to use when',

&' resetting the grid values.',/)

CReturn

End

subroutine msgwpg

cwrite (6,10)

10

form

att/,'

Lef's

tr

y

ag

ain

to

fin

d

yo

ur

po

lyg

on

') c

retu

rne

nd

C +\*C

ncbp -

Number coordinate byte packing.

Converts a

single

C Integer number to the Envision terminal code.

C Author: Robert Slmpson.

C-

£ **************************************************************

Character*3 Function ncbp(1)

Character blank*!

Parameter (lmax-16284)

Parameter (1m1n«0)

Parameter (blank-'

' ,1blank= Ichar( '

')) C C

- Force

1 Into bounds...

11n»m1n(1max,max(Imln,1))

C -

Get hi

and lo

bytes and offset with blank...

1lo=mod(11n,64)+1b1ank

1med=1tn/64+lblank

C -

Put bytes together...

ncbp=blank//char(Imed)//char(11o)

CReturn

End

C+**************************************************************

~

I 25

\* ^**

^^

C newold

- Copies the topology structure store In

the newtopo

occcccccc-c

common blocks onto the old topology stored In

the

topology common block.

If a polygon passes a

test

we do this to store the new structuring of the polygons

**************************************************************

Subroutine newold


&11eft(100),1r1ght(100)

Common /newtopo/1nfnew(100),lupnewf100),1dwnew(100),

&1Ifnew(100),1rtnew(100)

Common /commands/nmax,eps1In,del In,del out

Do 10

1*1,nmax

1nfo(1)-1nfnew(1)

1 upper(1) 1upnewC1)

IdownC1)-1dwnew(1)

1left(1)-11fnew<J)

1r1ght<1)-1rtnew<1)

10 Continue

Return

End

oldnew - Copies the old topology, stored In

the common block

topology, onto the new topology stored In

the common

block newtopo.

This

Is done to restore the original

topology of the polygons, to the working topology

arrays (newtopo),

If a

polygon crosses another during

testing.

**************************************************************

Subroutine oldnew


&11eft(100),1r1ght(100)

Common /newtopo/1nfnew(100),1upnew(100),1dwnew(100),

&11fnew(100),1rtnew(100)


Do 10

1=1,nmax

Inf new( lupnewl 1dwnew( 1 lfnew( 1rtnew(

10 Continue

Return

End

-1nfo( 1 ) * 1 u

pper ( 1

*1down( 1 )

-11eft( 1 )

»1r 1ght( 1

C +CCCCCCCCCCCC-C

************************************************************

outcom - OUTput COMmand mode -

Driver for controlling the

output files generated by POLYGON for use by other

modeling programs (PFMAG3D, PFGRAV3D, MAGPOLY, GRAV-

POLY).

Options are:

p * Plouff/Godson format for GRAVPOLY/MAGPOLY

s * Standard grid for pfmag3d, pfgravSd,

...h

- Help

q * Quit and return to Polygon command level

i*******Subroutine outcomf1 test)

126


Call enhmsg('*** Output file mode *** )

1test*0

ierror^F

Do 10

whlleC1t«st.EQ.0)

ans«'h*

quest*' Output file mode (p/s/h/q)'

1 val* 1 a

quest(quest,ans , M

a2 ) ' ,-2 )

If (ans.EQ.'P'

.O-.ans.EQ.»p») Then

Call plfoutilerror)

Else If

(ans.EQ.*S'.OR.ans.EQ.'s') Then

Call stdoutClerror)

Else If

<ans.EQ.'H'.OR.ans.EQ.'h») Then

Call hlpout

Else If

(ans.EQ.'Q».OR.Ival.EQ.-l.OR.ans.EQ.'q') Then

1test=l

ElseCa11 errmsg

End If

If (lerror.EQ.-l) Then

Call wrtmst,*'

Error encountered*)

1error

s0itest*-!

End If

10 End Do

Return

End

»***ipckply - Allows the user to position the cross-hair cursor to

locate a

polygon, enhances the polygon

If found, and

returns the polygon & corner number, and x,y screen

coordinates (unzoomed).

Subrout tne

pckply(npoly,ncorn,x,y,ans,mcur,ttest)



Common /topology/Info(100),1 upper(100),Idown(100),

&1left(100),1 right<100)

Common /zoom/1 zoom,1zva1,nzoom,ncmlnz(S),ncmaxz(5),nrm1nz(5),

Anrmaxz(5)



Common /colors/plye 1r,black,whIte


Character op«n*l , sol 1d*l ,f 1 I

typM , pi y

clrM, black*! , w

hite*!

Character votflg*2,mcflag*2,mcur*2,ans*2

1test=0

npoly*0

ncorn=0

- If

cursor type has not been selected prompt for type.


Call askmoc(mcur)

If (mcur.EG.'Q') Then

1test=-l

Else

127

mcflag-mcur

End If

Elsemcur*mcflag

End If

CCall fndtop(ntop)

If (ntop.GE.l) Then

Ipoly* 1nfo( n

top)

Else1test--l

End If


found (ItestM), or user

C wants to quit (1test»-l).

CDo 10

whlleCltest.EQ.Jfl)

Call Intply

Call retpnt( x ,y,. .cur , lerr )

If <lerr.GE.1) Then

If (Izoom.EQ.1)Cal1 1nvers(x,y,x,y)

Cal1 tester(npoly,ncorn,Ipoly,x,y,lerr)

If (npoly.LE.0) Then

Call wrtmsg(*

Could not find your polygon...try again.')

1err=0

End If

CIf

(lerr.GT.0) Then

CC -

Enhance polygon and prompt.

CCall setclr(whlte)

Call setfll(open)

nptloc=numply(npoly)


Do 20 1=1,nptloc

Call trans(xloc(1),yloc(1),xscr(npoly,1),

& yscr(npoly,1) )

20

Continue

ElseDo 25

J=l.nptloc

xloc(J)=xscr(npoly,J)

yloc(J)=yscr(npoly,J)

25

Continue

End If

Call drwclp(xloc,yloc,nptloc,xleft.xrIght.ybot,ytop)

CC - Ask If

enhanced polygon Is

correct one.

CCall askenh(ans)

If (ans.EQ.'Y* >

Then

1test=l

ElseCall setclr(plyclr>

Cal1 drwclp(xloc,yloc,nptloc,xleft,xrIght,ybot,ytop)

If (ans.EQ.*Q') Then

npoly«0

ncorn^tf x«0.0

y=0.0

1test»-l

*.' 1 Op

End If

f ^O

End If

Call setf 1 K

sol Id)

Else If

(lerr.LT.0) Then

1test=-l

End If

Elseitest»-l

End If

10 End Do

If {Itest.EQ.-l)ans-'Q'

CReturn

End

C +£ *************************************************************

C pckpnt -

Determines the corner number of a

polygon picked.

C-r *************************************************************

Subroutine pckpnt(ncorn,d1st,x,y, ans,npoly,mcur)

Dimension xp1y(100),yply(100)

Common /screenloc/ntotal,nump1y(100),xscr(100,100),yscr(100,100)

Common /zoom/1 zoom,1zva1,nzoom,ncm1nz(5),ncmaxz(5),nrminz(5),

&nrmaxz(5)

Common /commands/nmax,eps11n,del1n,de1out

Character mcur*2,ans*2

Cnbrpts=numply(npoly)

If Cnbrpts.GE.1) Then

Cal1 askpnt(ans)

Do 40 wh11e(ans.EQ.'N' )

Call hlpcpl


If (lerrZ.GE.l) Then

If (Izoom.EQ.1 )Cal1 1nvers(x,y,x,y)

Do 35

k=l,nbrpts

xp!y(k)»xscr(npoly,k)

yply( k )**yscr ( n

poly ,k )

35

Continue

1con=l

Call dspnt(ncorn,d1st,x,y,xp1y,yp1y,nbrpts,

& delout,Icon)

If (ncorn.EQ.0) Then

Call wrtmsg(' Could not find corner near you point...

&try agaIn')Elseans»'Y'

End If

Else If

(1errZ.EQ.-l) Then

ans»'Q'

End If

40

End Do

Else

Call wrtmsg(* Polygon number passed to PCKPNT has no corners')

ans»'Q'

End If

CReturn

End

C +£

**************************************************************

C pdcom

- Driver for drawing grid on terminal and polygon draw-

C ing

mode (PLYCOM).

C-£ **************************************************************

Subroutine pdcom(ltest)

"* 1 2 9

Common /misc/ncol,nrow.fIrst,ntop,IfIrst

Common /oMglnal/lwcorg, Jwcorg , n

xorgp , n

yorgp


Common /scale/xsc,ysc,xstart,ystart,xlnlt,yln1t

Common /sealefacts/twc0,Jwc0,nxp1x,nyp1x,p1xdfm


Common /colors/plyclr,black,wh1te

Common /f

\11/open,sol Id,fI 1typ

Ch

ara

cte

r p

lyc

lrM

,bla

ck

*l,w

h\te

*1

,op

en

*1

,so

l1d

*l,f1

ltyp

*l,f1

rs

t*l

1test»l

1t«st2»l

If ( If I

rst.EQ.1) Then

Cal1 Intscr

Call clrsgcH 1,ItestZ>

If (1test2.GE.0> Then

Cal 1

clrply

1wcorg*1wc0

Jwcorg»Jwc0

nxorgp*nxp1x

nyorgp*nyp

\x Ca11 setbnd

If (mdflag.EQ.1> Then

Call setclr(plyclr)

Call self 11(open)

Call drawwalk

Call set*!1(sol Id)

End If

End If

End If

If (1test2.GE.0) Then

xstart«ncm1n

ystart=nrmln

xsc = f

loat(nxp 1 x >

yscafloat(nyp1x)

Call setbnd

Cal1 plycom(ttest)

Else1test=-l

End If

If (ntop.GT.0)mdflag=l

If (1test.GE.0)Iftrst=0

Return

End

r***l

plfout - Constructs a

Plouff/Godson GRAVPOLY/MAGPOLY model

file from a

POLYGON model.

*******************

Subroutine plfout(1 test)


1test»0

Do 10

whlle(1test.EQ.0>

ans='G

fquest*' Gravity or

Magnetic model (g/m/h/q)

I val = laquest(quest,ans,*(a2 >',-2)

If (ans.EQ.'G» >

Then

Cal 1

Else If

Call magmod(1 test)

Else If

(ans.EQ.'H*) Then

tu. 'b' ) men

grvmod(Itest)

«

1 Xf)

(ans.EQ.'M'> Then

T ^ v

Call hlpplf

Else If


1test=-l

ElseCall errmsg

End If

10 End Do

CReturn

End

C +Q ******************************************************* ***1

C plycom -

PoLY COMmand -

Driver for Polygon mode.

Options

C are.

CC a

C c

C d

C e

C s

C h

C q

Add a

polygon

Change polygon parameters

Delete a

polygon

Edit a

polygon, (add/delete/move) points

Special functions (copy/move/rotate)

Help

Quit and return to Polygon Command level

C C-L*

Subroutine plycomC1 test)

Character string*?,quest*80,ans*2

str1ng*'ACDESHQ'

CCall enhmsg('*** POLYGON add/change_parm/delete/ed1t_poly mode

& mode ***')

CCall clrply

Cltest-0

ans-*h'

Do 10 wh1le(ltest.EQ.0)

If lag-'P*

If ( 1f l

ag.EQ.»M» >

Then

Call wrtmsg(* Polygon add/change_parm/delete/ed1t_poly mode

& (a/c/d/e/s/h/q)')

Call getmenu(str1ng,7,ans,1error)

Elsequest=' POLYGON add/change__parm/delete/ed 1 t__poly

mode

& (a/c/d/e/s/h/q)'

1va1 = 1aquest(quest,ans,Ma2)',2)

End If

CIf

(ana.EQ.'A'.OR.ans.EQ.'a') Then

Call addply(lerror)

Else If

(ans.EQ.'C'.OR.ans.EQ.'c') Then

Call chgply(lerror)

Else If

(ans.EQ.'D'.OR.ans.EQ.'d') Then

Cal1 delply(lerror)

Else If

{ans.EQ.'E'.OR.ans.EQ.'eM Then

Cal1 edtply(lerror)

Else If

(ans.EQ.'S'.OR.ans.EQ.'s') Then

Call spfcom(lerror)

Else If

(ans.EQ.'H*.OR.ans.EQ.'h') Then

Call hlpply

Else If

(ans.EQ.'Q'.OR.1val.EQ.-l.OR.ans.EQ.*q*) Then

ltest-1

ElseCall errmsg

End If

ans ='q'

10 End Do

CReturn

End

C+

CC plytst -

PoLY TeST -

Tests whether a

given location (x,y)

Is Inside (lnout-1) or outside (1nout*0) of the poly

gon given by the arrays xpoly and ypoly.

Author: Richard 0.

Blakely, USGS, Menlo Park, CA.

Modified by Bruce A.

Chuchel, USGS, Menlo Park, CA, 2/84.

Subroutine plytst(xpoly,ypoly,nbrpts,x,y,Inout)

DImenston xpoly(nbrpts),ypoly(nbrpts)

lcount=0

1nout»0

xm1n

ssxpoly( 1)

xmax^xpoly(1)

ym1n*ypoly(1)

ymax=ypoly(1)

Do 10

J = l,nbrpts

xmax=amax1(xpoly(J), max)

xm1n*am1nl(xpoly(J),xm1n)

ymax=amaxl(ypoly(J),ymax)

ym1n*am1nl(ypoly(J),ym1n)

10 Continue

If ((x.GE.xmln.AND.x.LE.xmax).AND.(y.GE.ymln.AND.y.LE.ymax>) Then

Do 20 1-1 ,

nbrpts

lup*1+1

If (1.EQ.nbrpts)1up=l

xlmax«amaxl(xpoly(fup),xpoly(1))

xlm1nsam1nl(xpoly( 1 u

p),xpoly(1))

If (x.GE.xlmln AND.x.LT.xImax) Then

a=(ypoly(1up)-ypoly(1))/(xpoly(1up)-xpoly(1))

b=ypoly( 1 )

-a*xpoly(1)

y0*a*x+b

If (y0.GE.y)1 count*1 count*1

End If

20

Continue

1nout*mod(1count,2)

End If

Return

End

**********************************************************************

rdeblank

- Eliminates blanks at right end of

strlngl, returns

as str1ng2 with new length 12.

Author: Robert W.

Simpson, USGS, Menlo Park, CA.

****************************************

Subroutine rdeblankt str1ngl,str1ng2,12)

Character***) strIngl,str1ng2

ll=len(str1ngl)

132

Find last

non-blank character on

right

Do 10

1=11,1,-!

10 If

(str IngH 1 : 1 ) .NE. '

' )Go To 20

20 12-1str1ng2*str1ngl

Return

End

t***irdhead

- Reads

1n the header block of

a standard grid (new and

old) versions.

If an

error

1s encountered on

reading

the header an

attempt 1s

made to

read 1t

as an

old

standard grId.

1test B

Flag for

type of

grid header read.

« 1

B New version of

standard (with proj,...)

» 0

* Old version of

standard (without proj,...)

- -1*

Error encountered, not a

recognizable header

Author: Robert Slmpson

»*******************!

Subroutine rdhead(unit,Id,pgm,ncol,nrow.nz,

&xo,dx,yo,dy,1proJ,cm,bl,1 test)


Integer unit

Read (unIt,err=20)Id,pgm,ncol,nrow,nz,xo,dx,yo,dy,1proJ,cm,b1

print '(Ih0,a,12,2(a,f10.4))',

& '

Proj-',IproJ,'

cm-',cm,*

bl=',bl

1test«l Return

20 Continue

Rewind unit

Read (unit,err=30)1d,pgm,ncol,nrow,nz,xo,dx,yo,dy

print '(Ih0,a)',

' Grid has

no projection specs

1n header...

1proJ=0

cm«0.0

bl=0.0

1test*0

Return

30 Continue

Write (6,35)

35 Format (/,'

Error encountered on

reading grid header',/)

1test=-l

Return

End

readmd

- READ MoDel

- Reads In

a Polygon model file.

*************************

Subroutine readmd(1 test)


&1left(100),1r1ght(100)


Common /parameter /parm( 100, 10)

1 "2 "7

Common

/ label s/label

"~ { j j

Common /Junk/ngbtop,Jnktopt100),ngbloc,Jnkloc(100)


Common /commands/nmax,eps11n,del 1n,del out

Common /grIdspecs/1d,pgm,nc,nr

tnz,xo,dx,yo,dy,1proj,cm,bl

Common /original/Iwcorg,Jwcorg,nxorgp,nyorgp

Character label(10)M5

Character 1d*56,pgm*8,grdnam*80,modnam*80,modgrd*80

Open <10,f1le»modnam,status='old',form=*formatted*,

&carr1agecontrol«*1 1st*,err = 1

00)

- Read

In the number of polygons In

the model

Read (10,10)ntotal

10 Format <x, 13)

Read <10,20)(label(kk),kk=1,5)

Read (10,20)(label(kk),kk=6,10)

20 Format (5(x,al5) )

- Read In

the polygon number, the number of points

In this

polygon, the screen locations and the polygon parms.

xcndel=nxorgp/dx

ycndel=nyorgp/dy

1count=

1Do 60 whlle«Icount.GE.1).AND.( 1 c

ount.LE.ntota1)

&.AND.(1 count.LE.nmax))

Read (10,33)npoly,nbrpts

33

Format (2(x,13»

Read (10,35)(parm(npoly,1),1=1,5)

Read (10,35)(parm(npoly,1),1=6,10)

35

Format (5<x,el5.8>>

numply(npoly)=nbrpts

Do 40

J = l,nbrpts

Read <10,45)xgrId,ygrId

45

Format (2(x,el6.8))

xscr(npoly,j)=1wcorg+((xgr1d-xo)*xcndel)

yscr(npoly,J)=Jwcorg+((ygrId-yo)*ycndel)

40

Continue

1 count*1count+1

60 Continue

- find garbage locations

kh1t=0

ngbloc=0

Do 50 1=nmax,1,-1

nloc=numply{1)

If (nloc.GT.0.AND.kh1t.EQ.0) Then

kh1t=l

Else If

(nloc.LE.0.AND.kh1t.EQ.1) Then

ngbloc*ngbloc+l

Jnkloc(ngbloc)-1

End If

50 Continue

- Now read In

the topology structure

ndpstn=1

Do 70

k=l,nmax

Read (10,65) 1nfo(k),lupper(k),1down(k),1left(k),1r1ght(k)

65 Format (5(x,13)>

**> "j

~< A

70 Continue

; -

Find the garbage topology locations.

nh1t«0

ngbtop^JfrDo 80 J=nmax,l,-l

1nf=1nfo(J)If

(Inf.GT.0.AND.nh1t.EQ.0) Then

nh1t»l

Else If

(Inf.LE.0.AND.nh1t.EQ.1) Then

ngbtop=ngbtop+1

Jnktop(ngbtop)«J

End If

80 Continue

n

Close (10)

1test»l

Return

100 Continue

Close (10)

1test«-l

Return

End

t***i:

REDGRD

- REaD GRId

- Reads In

a standard grid

r_

Subroutine redgrd(name,Itest)


Common /grIdspecs/Id,pgm,nc,nr,nz,xo,dx,yo,dy,1proJ,cm,b1

Character name*80,1d*56,pgm*8

C1test«lOpen (10,f1le*name,status='old*,form='unformatted',err»100)

Ca 11

rdhead(10,1d,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,b1,Itest)

If (Itest.GE.0) Then

Do 20 J=l,nr

Read (10,End »20)dummy,(grd(1+(J-l)*nc),1-1,nc)

20

Continue

End If

Close (10)

Return

C100 Continue

Close (10)

1test=-lReturn

End O£ *************************************************************

C redwrk

- Reads In

a standard

grid to

the work

array, called

C by

subroutine stdout

(STANDARD OUT).

C-L*

Subroutine redwrk(name,Itest)



&1proJ2,cm2,bl2

Character name*80,1d2*56,pgm2*8

C1test=l

135

Open (10,f1le*name,status*'old *,form*'unformatted *,err=100)

Cal1 rdhead(10,IdZ,pgm2,ncZ,nr2,nz2,xo2,dx2,yoZ,dy2,1proJZ,cm2,

Abl2,Itest)


Do 20 J=l,nr2

Read (10,End »20)dummy,(wrkgrd(1+(J-1)*nc2>,1=1,nc2)

20

Continue

End If

Close (10)

Return

C100 Continue

Close (10)

1test*-l

Return

End C+C

retpnt - RETurn PoINt -

Returns the current Envision cross-

C hair screen location (x,y),

depending on

whether the

C mouse of

cross-hair cursor keys were selected.

CC mcur

= 'm'

« Mouse Is

selected

C 'c'

= Cursor keys selected

CC-

Subrout1ne retpnt(x,y,mcur,Itest)

Character ans*l,mcur*2

CIf

(Itest.eq.3) Call

msgspm

CC -

If mouse was selected enable mouse and read In

point.

CIf

(mcur.EQ.'M') Then

Call softky('l')

If ( I

test.eq.3.or.Itest.eq.2) then

Call setmou

Call loadmou

End If

Cal1 curon

1test*0


20

Continue

Call getmou(mode,1x,1y)

x=float(1x)

y=float(1y)

If (mode.EQ.l) Then

Call drwpnt(x.y)

ltest-1Else If

(mode.EQ.2) Then

Call drwpnt(x,y)

1test»2

Else If

(mode.EQ.23) Then

1test=-l

Else If

(mode.EQ.3) Then

Call hlpmpt

ElseCall wrtmsgl' Mouse button not def1ned...try again*)

End If

If (Itest.EQ.0)Go To

20 End If

Cal 1 curoff

Call softkyCff*)

- Else If

cursor was selected, enable the cross-hair cursors

and read In

point.

Else If

(incur .EG. *C* ) Then

Cal1 curon

1test=0

If (1test.EQ.0> Then

30 Continue

Call gtpnt(ans,x,y)

If tans.EG.*e') Then

Call drwpnt(x,y)

1test-l

Else If

(ans.EQ.'f) Then

Ca11 drwpnt(x,y)

1test=2

Else If

(ans.EQ.'h') Then

Call hlpcur

Else If

(ans.EQ.'q') Then

1test=-l

End If

If (1test.EQ.0)Go To

30

End If

Call curoff

End If

100 Continue

Return

End

**************************************************************

rotate

- Rotates the point xold.yold about the origin xorlgn,

yorlgn by the angle theta.

Subroutine rotated xnew,ynew,xold,yold,xor1gn,yorIgn,theta)

p1=3.14159265

delx=xold-xor1gn

de1y=yold-yorIgn

r1en=sqrt<delx**2+dely**2)

If (rlen.LT.1.0e-16)rlen=1.0e-16

?i1phacas1n{abs(delx/rlen) )

alpha-180.0*alpha/p1

If (dely.GE.0.0) Then

If <delx.LT.0.0)alpha=-alpha

ElseIf

(delx.GT.0.0) Then

a1pha-180.0-alpha

Elsea 1pha =a1p ha +

180.0

End If

End If

alpha=90.0-alpha

If (alpha.LT.0.0)alpha=360.0+amod{alpha,360.0)

xnew*r len*cos( (theta-t-a 1 p

ha )*p1/180.0)+xor1gn

ynew=rIen*s1n((theta+alpha)*p1/180.0)+yorIgn

Return

End137

*** *****!

I****************************

C rotply - Allows a polygon to be rotated about a

selected origin

C by the amount theta.

C-CSubroutine rotply(1 test)

Dimension parstore(10)


&11eft<100>,1r1ght<100)






Common /Junk/ngbtop,jnktop(100),ngbloc,Jnkloc(100)

Common /zoom/1 zoom,Izval,nzoom,ncm1nz(5),ncmaxz(5),nrmlnzl5),

&nrmaxz(5)

Common /grldspecs/ Id,pgm,nc,nr,nz,xo.dx,yo,dy,IproJ,cm,bl

Common /scale/ xsc,ysc,xstart,ystart,xIn It,yIn 11

Common /original/ Iwcorg,Jwcorg,nxorgp,nyorgp


Common /state/If last,Iftln,1 ftout,ndpstn,lup

Common /commands/nmax,eps1In,del In,delout.

Common /max/nptmax

Common /colors/plyclr,black,whIte


Character open*!,solIdM,f1ItypM,plycIr*1,black*1,wh1te*l

Character votflg*2,quest*80,mcflag*2,mcur*2,ans*2,ans2*2

Character Id*56,pgm*8,ans3*2,ans4*2,use*2

CCall enhmsg('*** Rotate polygon mode ***')

C1test-0

CC -

Test the number of polygons ntotal, exit If

<=0.

CIf

(ntotal.GT.0) Then

CC -


CIf

(mcflag.EQ.'N') Then

Call askmoc(mcur)


1test=-l

Elsemcflag*mcur

End If

Elsemcur=mcflag

End If

CC -

Print help message

CIf

(votfIg.EQ.*V*)Ca11 hlprot

CC - Start looping until polygon

Is found (1test=l), or

user

C wants to quit (1test=-l).

CDo 10

whlle(1test.EQ.0)

Iflag=0


use='N'

C C -


138

Cal1 Inttmp

- Let user pick polygon, and return npoly,ncorn,x,y.

Cal1 pckply(npoly,ncorn,x,y,ans,mcur,1err)

- Ask If

corner of polygon picked should be used

:If

(ans.EQ.'Y'> Then


Call askrot(ansZ)

If (ansZ.EQ.'Y') Then

x0»xscr(npoly,ncorn)

y0*yscr(npoly,ncorn)

use-'Y'

Else If

(ansZ.EQ.'N*> Then

:E - Message about repositioning cursor to new location

^

Call askrt2(ans3)

If (ans3.EQ.'Y') Then

Cal1 modpnt(ncorn,d1st,x,y,ans4, npoly,meur)

If (ans4.EQ.'Y') Then

x0=xscr(npoly,ncorn)

y0=yscr(npoly,ncorn)

use*'Y'

Else1test=-2

End If

Else If

(ans3.EQ.*N*) Then

Call hlprtZ


If (lerr.GE.0) Then


Call 1nvers(xnew,ynew,xscnew,yscnew)

Elsexnew-xscnew

ynew=yscnew

End If

x0=xnew

y0»ynew

Else1test=-l

End If

Else If

(ans3.EQ.*Q*) Then

1test=-2

End If

Else If

(ansZ.EQ.'Q') Then

1test--2

End If

If (1test.LE.-l)Go To 20

:C -

User enters rotation angle In

degrees counter-clockwise.

:1test4>0

Do 45

wh11e<1test4.EQ.0)

Write (6,48)

48 Format (/,

4

' You will now enter the rotation angle for',

& * this polygon, measured',/,'

In degrees

', &

' counter-clockwise.',/)

theta=0.0

quest** Rotation angle'

1val=1rquest(quest,theta,'(e!6.8)',0)

If {Ival.EQ.-l) Then

1test4--2

1test*-2

Else1test4-l

End If

45 End

DoIf

(1test.LE.-l)Go To 20

- Rotate polygon and store.

ntemp*nbrpts

Do 30

1*1,ntemp

If (use.EQ.'Y'.AND.1.EQ.ncorn) Then

xtemp(I)*xscr{npoly,ncorn)

ytemp{1)*yscr{npoly,ncorn)

ElseCal1

rotate(xtemp(1),ytemp{1),xscr(npoly,1),

& yscr(npoly,1),x0,y0,theta)

End If

30

Continue

- Test the polygon to see If

It has

been rotated completely off

the unzoomed screen.

xlfunz*x1nIt

xrgunz*x1n1t+nc*nxorgp

ybtunzsy1n1t

ytpunz*y1n1t+nr*nyorgp

Call testoff(xtemp,ytemp,ntemp,xlfunz,xrgunz,ybtunz,

& ytpunz,1ntota1)

If (Intotal.LE.0) Then

If {Intotal.EQ.0) Call

wrtmsg{' Error, polygon will be

& rotated off of

unzoomed screen')

Go To 20

End If

- Store the polygon parameters.

Do 25

1 1 = 1 , 10parstore(11)=parm(npoly,11)

25 Continue

- Test the new polygon In

the xtemp,ytemp array and fit Into


Call testopo(npoly,1test2)

If (ltest2.GE.l) Then

npoly2*1nfo(ndpstn)

Do 35

11 1 = 1 , 10parm(npoly2, 1 1 1 )**parstore( 1 1 1 )

35 Continue

Iflag-1 End

If 1test=l

20

Continue


Call setclr(plyclr)

Call self 1

1(open)

Call drwclp(xloc,yloc,nptloc,xleft,xr1ght,ybot,ytop)

-» 4

A r\ End

If f

*f U

Else If

(ans.EQ.'N') Then

1test=0

Else1test=-l

End If

Call setf11(sol1d)

If ( l

err.EQ.-l)1test»-l

Else If

(mcur.EQ.'Q*) Then

1test=-l

End If

10 End Do

ElseCall wrtmsgl'

Sorry, no polygons')

1test«-l

End If

CReturn

rstply - ReSeT PoLY - Resets grid locations In

wrkgrd under

control of irst.

If 1rst=l, resets grid points

within polygon xtmp,ytmp;

If 1rst=0, resets grid

points outside of polygon xpoly, ypoly.

i**************************************

Sub rout Ine

rstplyl xpoly , y

poly , n

brpts , n c

m In, n

cmax, nrmln, nr m

ax,

Anc ,nr,rstval , 1rst, 1 t

est )

D tmens Ion

xpoly ( n

brpts ) , y

poly ( n

brpts )

Common /work/wr kgrdl 250000)

If < (

nrmln.LE. nrmax) .AND. (

nrmln.GE. 1 .

AND . n

rmln . LE . nr ) .

AND .

&( nrmax .GE . l

.AND.nrmax.LE.nr) )

Then

1test«l

ElsePrint *,'

Error

In nrmln and nrmax'

Print *,'

nrm 1 n

= ' , n

rm 1 n , '

nrmax= ', n

rmax

1test=-l

End If

If ( (

ncmIn.LE. ncmax) .AND. (

ncmln.GE. 1 . A

ND . n

cmin . LE . nc ) .

AND.

&(ncmax.GE. 1 .

AND .ncmax.LE.nc ) )

Then

1test=l

ElsePrint *,'

Error

In ncmin and ncmax'

Print *,'

ncml n« ' , n

cm 1 n , '

ncmax= *, n

cmax

1test=-l

End If

If ( I

test. EQ.-l )Go To 50

1nout=l

Do 50 J=nrm1 n , n

rmax

Do 50

1 =ncm1n , n

cmax

Call plytstl xpoly , y

poly , n

brpts , x 1 ,y1 , I

nout)

If ( I

nout. EG. Irst)

Then

wrkgrd( 1+( J-l )

*nc )=rstval

End If

50 Continue

Return

End

141

- Scales grid to fill screen...

Screen 1s

(4151x3120)

In world coordinates we »

(1wc,Jwc).

A pixel here Is

a box around

1 we point =

smallest possible box.

A box Is

an (nxplx X

nyp1x) set of

pixels.

Define area of

screen for drawing...

**************************************************************

Subroutine seaIeg2sc(If lag)

Character esc*l,wcbp*5,1d*56,pgm*8

Parameter (esc»char(27))

Common /scale/ xsc,ysc,xstart.ystart,xInlt,yInlt

Common /subscreen/ xscrn(2),yscrn(2),xgrd(2),ygrd(2)

Common /grIdspecs/fd,pgm,ncol,nrow,nz,xo,dx,yo,dy

Common /scalefacts/1wc0,jwc0,nxp1x,nyp1x,p1xd1m

Common /subgrId/1cmIn,Icmax,Irmln,1rmax,ncm1n,ncmax,nrm1n,nrmax

1wcm1n*n1nt(x1n1t)

Jwcm1n»n1nt(yInlt)

Iwcmax^n1nt(xscrni2))

Jwcmax*n1nt(yscrn(2)>

ncd Iff*ncmax-ncm1n+1

nrd1ff

enrmax-nrm1n+l

: - Width and ht of grid

In grid units (usually km)...

If (ncdlff.EQ.0)ncd1ff=l

If (nrdlff.EQ.0)nrd1ff=1

Wldth=ncd1ff*dx

ht«nrd1ff*dy

C -

Dimension of

allowed screen area

In pixels...

1scr«Iwcmax-Iwcmln*1

Jscr=Jwcmax-Jwcmln*1

C - Get scale factors (km/pixel) for both x

and y directions...

C Choose that factor (the bigger) which will Just fit grid to screen

p1xd1msmax(width/real(1scr),ht/real(Jscr))

nxtotp1x*w1dth/p1xd1m

nytotp1x=ht/pIxdlm

1 -

Find pixel dimensions of a

box by roundlng...

nxp1x-n1nt((wldth/p1xd1m)/rea1(ncdIff))

nyp1x«n1nt<(ht/pIxd1m)/rea1<nrdIff))

; - Check result against screen size...If too big cut back by 1...

200 Continue

If <nxp1x*ncd1ff.GT.Iscr) Then

nxp 1 x = n

xp1x-1

Go To 200

End If

»

210 Continue

If <nyp1x*nrd1ff.GT.Jscr) Then

nyp1x=nyp1x-l

Go To 210

End If

Z - Check final scaling...

wbyh=real(nxp1x*ncd1ff)/real(nyp1x*nrd1ff)

wbyhtrue*w1dth/ht

fracerr=(wbyh-wbyhtrue)/wbyhtrue

: If

{ Iflag.EQ.1) Then

: Print *,'

I

Print *,'

x vs.

y scale distortion =',fracerr

- Print

* ,wbyh,wbyhtrue

*"* 4

A :

End If

/ 4P

If (abstfracerr.GT.0.05)) Then

c

Print *,'WARNING...grid ht vs.

width distorted by ',fracerr

Print *,'

Grid will probably scale better If

It Is

coarser...'

End If

CC -

Center of first box, and origin of grid coordinate system...

C (a

box 1s

centered on each grid point)

C1wc0«1wcm1n+nxp1x/2

Jwc0»Jwcm1n+nyp1x/2

C If

(1flag.EQ.l) Then

C Print *,'

' C

Print *,

C &

'ncol,nrow,nxtotp1x,nytotp1x,nxp1x,nyp1x'

C Print *,

C &

ncol,nrow,nxtotp1x,nytotp1x,nxp1x,nyp1x

C End If

CReturn

End

C +£ *********************************************************************

C scalen -

Determines the scaling factors XSC,YSC for a

(sub)grld.

C-£

*********************************************************************

Subroutine scalen

Common /scale/xsc,ysc,xstart,ystart,xIn It,yIn It


Common /sealefacts/1wc0,Jwc0,nxp1x,nyp1x,pIxdlm

CXSCB0.0

ysc«0.0

CIf

(( ncmax-ncmln ).GT.l )xsc=l.J0*nxp1x

If ((nrmax-nrmln),GT.1)ysc»1.0*nyp1x

CReturn

End

C +WC

selftest -

Tests whether a

polygon Is

self-cross Ing

(self-

C reentrant).

Test by comparing the sides

In pairs for

C crossing.

Subroutine exits Immediately on finding

C the first pair of sides (NSIDE1,NSIDE2 )

that do cross.

CC FORM.

CC CALL SELFTESTUFLAG,NSIDE1,NSIDE2,XPOLY,YPOLY,NBRPTS)

CC Iflag *

Flag Indicating whether a

polygon Is

self-

C crossing or not.

C *

1 -

polygon Is

NOT self-crossing

C »

0 - polygon passed has three corners or less.

C «-l

- polygon is

self-crossing.

CC nsldel,ns1de2 » Sides of polygon that cross; returned nonzero

C when 1flag--l.

NSIDE1

Is defined as the line

C segment joining the corner point xpo1y(nsIdel),

C ypoly(nsIdel) to xpoly(nsIdel+1),ypoly(nsIdel+1).

CC xpoly,ypoly » Array containing corner points of polygon

C nbrpts *

Number of corner points

In polygon xpoly,ypoly

*""" I 4 6

C ^

C Author: Bruce A.

Chuchel, USGS, Men 1o

Park, CA., 1/85.

Subroutine selftest{iflag.nsidel,ns ide2,xpoly,ypoly.nbrpts)

DImension xpoly(nbrpts),ypoly(nbrpts)

- Test to see if

the polygon passed to SELFTEST has

the minimum

number of

points (4).

If {nbrpts.GE.4) Then

- Loop through sides and test for

crossing.

1 lowl

Do 20

i«3,nbrpts

If {i.EQ.nbrpts) Then

xl*Bxpoly( nbrpts)

y 1 =ypoly{nbrpts)

x2»xpoly(1)

y2»ypo1y(1)

ilow«2 Elsex1*xpoly(i)

yl*ypoly{i)

x2=xpo1y(i + 1 )

*y2=ypoly(1 + 1 )

End If

- Inner

loop points to

only those sides in

the polygon that

are before side

i, and are not adjacent to it.

Do 20

J-ilow,i-2

If (J.EO.nbrpts) Then

xtl=xpoly{nbrpts)

ytl*ypo1y{nbrpts)

xt2=xpoly{1)

yt2=ypoly{1i

Elsextl»xpoly(J)

ytl=ypoly(J)

xt2=xpoly(3+1>

yt2=ypoly{J+l)

End If

- Test corner points of

individual line segments

i and

J for

crossing.

Call tstseg(ncross,xl,yl,x2,y2,xtl,ytl,xt2,yt2)

- If

line segments cross then, set

if lag, nslde*, and exit.

If (ncross.EQ.1) Then

if lag--lns idel*1nside2«J

Go To 100

End If

20

Continue

iflag=l ns1del=0

nside2=0

Elseiflag=0

ns1del=0

4 .

nside2=0

~

j 44

End If

Continue

Return

End

r***i

setbnd - Sets up

the screen boundary common block (xleft,xrIght,

ybot,ytop ).

t**********Subroutine setbnd

Common /sca1e/xsc,ysc,xstart,ystart,x1n1t,y1n1t


Common /orIglnal/Iwcorg,Jwcorg.nxorgp,nyorgp

Common /grIdspecs/1d,pgm,nc,nr,nz,xo,dx,yo,dy,iproJ,cm,b1

Common /zoom/tzoom,Izval,nzoom,ncminz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)

Common /sealefacts/1wc0,JwcJfl.nxp1x,nyp1x,p txdlm

Common /subgrld/tcmln,1cmax,trmln,1rmax,ncm1n,ncmax,nrm1n,nrmax


xleffxlnlt

ybotayIn It


xr1ght=(ncmax-ncm1n+l)*nxp1x+x1n1t

ytop*(nrmax-nrm1n-«-l )*nyp1x+y1n1t

Elsexr1ght*nc*nxorgp+x1n1t

ytop*nr*nyorgp + > 'nit

End If

Return

End

!***!

setclr -

Sets the graphics foreground color.

See setclr.lnf

or Envision reference manual for parameters.

t******************:

Subroutine setc1r(color>

Character com*2,

com*'C'//color

Ca11 esccom(com)

Return

End

!***)

setdlm -

Sets the drawing logic mode on

the Envision.

See the

Envision reference manual or

setdlm.Inf for

details.

t*****************Subroutine setdlm(mode)

Character mode*l,com*2

com='L'//mode

Call esccom(com)

Return

End

1 A r-

\ 45

£ *************************************************************

C -

setfll

- SET FIL1

- Select the fill pattern.

C-£ *************************************************************

Su

bro

utin

e setflK

flll)

Ch

ara

cte

r f1

11

*l,co

m*3

C

co

m**O

H'//f1

11

Call esccom(com)

CReturn

End

C +£ *************************************************************

C setgrd

- Walks the tree starting at the root node and sets

C the grid.

C-£ *************************************************************

Subroutine setgrdlIval,Itest)

Dimension xpoly<100),ypoly(100)

Common /subscreen/xscrn(2),yscrn(2),xgrd(2),ygrd(2)

Common /topology/1nfo(100),1 upper(100),1down(100),1left(100),

&1r1ght(100)


Common /grldspecs/ld,pgm,nc,nr,nz,xo,dx,yo,dy,1proj,cm,bl

Common /box/xm1nbx(100),xmaxbx(100),ymlnbx(100),ymaxbx(100)

Common /max/nptmax



Common /scale/xsc.ysc,xstart,ystart,xlnIt,yInlt

Common /scalefacts/1wc0,Jwc0,nxp1x,nyp1x,p1xd1m

Common /orIglnal/1weorg,Jwcorg,nxorgp,nyorgp

CCharacter 1d*56,pgm*8

CCall fndtop(ntop)

If (ntop.GE.l) Then

C 4?.

next*ntop

rstval=0.0

1test=0

CDo S

J=l,nptmax

xpoly(J)-0.0

ypoly(J)=0.0

5 Continue

Crscxsc«0.0

rscysc*0.0

If (abs(xsc).GT.l.e-16)rscxsc«1.0/xsc

If (abs(ysc).GT.1.e-16)rscysc=l.0/ysc

CDo 10

while!Itest.EQ.0.AND.next.GT.0)

ngon*next

npoly=1nfo(ngon)


If (nbrpts.GE.1) Then

Do 30

1 = 1 .nbrpts

xpoly(1)=xstart+(xscr(npoly,1)-1wcorg)*rscxsc

ypoly(1)«ystart+(yscr(npoly,1)-Jwcorg)*rscysc

30

Continue

Crstval =parm( npoly, Iva 1 )

>-» | A £

C -

Call up

the bounding box and translate these coordinates Into

C subgrld locations {ncmln,ncmax,nrmln,nrmax).

Cxgrd{l>=0.0

xgrd(2>=0.0

ygrd(1)-0.0

ygrd{2)-0.0

Cxscrn(1)=xm1nbx(npoly)

xscrn(2 )»xmaxbx{npoly)

yscrn(1)»ym1nbx{npoly)

yscrn(2)=ymaxbx{npoly)

CDo 35

J-l ,2xgrd(J)"xstart+{xscrn(J)-1wcorg)*rscxsc

ygrd(J)«ystart+{yscrn{J)-Jwcorg)*rscysc

35

Continue

Cncm1n=11nt(xgrdf 1 ) )

ncmax* t f

nt(xgrd(2 ) ) + l

nrm1n=11nt(ygrd(1 ) )

nrmax=11nt(ygrd{2))+l

If (ncmln.LT.1)ncm1n=1

If (ncmax.GT.nc)ncmax=nc

If (nrmln.LT.1)nrmln=1

If (nrmax.GT.nr)nrmax=nr

C C1rst»l

Call rstply(xpoly,ypoly.nbrpts,ncmln,ncmax,nrmln,nrmax,

&

nc,nr.rstval,1rst,If lag)

CEnd If


If (next.EQ.J0f.OR. 1

test2.EQ.0) ItestM

If (1test2.EQ.-l)1test=-l

10 End Do

End If

CReturn

End

c+r; *************************************************************

CC setkam - SET Key Application Mode - Sets the Envision term-

C fnal

up In

ke

pad application mode.

CC-£ *************************************************************

Subroutine setkam

CCall esccomC' ')

CReturn

End

C +£ *************************************************************

C -

setlln -

SET LINe -Select the line style.

C-

£ *************************************************************

Subroutine setlln(llne)

'.naracter 11ne*l,com*2

^. »

A -y

com='T'//1Ine

Call esccom(com)

C +CCCCC-C

Return

End

i*************************************************************

setmou -

Sets up the mouse soft key button definitions, called

by subroutine getmou (GET MOUSE).

Author: Robert W.

Slmpson

i*************************************************************

Subroutine setmou

Character esc*l,alphup*8, aIphoff*8,alphon*3

Parameter (esc«char(27 ) )

Parameter (aIphup*'\<'//esc//*[A *//'V

s?')Parameter (aIphoff«'\<'//esc//'a0'//'\~?')

Parameter (alphon»esc//'a2*)

'RDM*'//alphoff//alphup//'

3\_\*

'RD\2*'//alphoff//alphup//'

2\_\'

'RD\3*'//alphoff//alphup//' 23\_\'

'RD\4*'//alphoff//alphup//'

1\_V

'RD\5*'//alphoff//alphup//' 13\_V

RD\6*'//alphoff//alphup//' 12\_V

'RD\7*'//alphoff//alphup//'123\_\'

CalCalCalCalCalCal

esc com (

esc com (

esccom(

esccom(

esccom(

esccom(

Cal 1 esccom(

tA'//esc//

CA'//esc//

CA'//esc//

[A'//esc//

[A'//esc//

[A'//esc//

[A'//esc//

Return

End

*************************************************************

settpl

- Sets the pointers

In the newtopo arrays for the case

when there are multiple polygons, both Inside and

outside of

npoly, at the same level

In the tree.

In - Array containing node positions of all

the polygons

contained In

npoly.

Jout - Array of node positions of all

those polygons

not contained In

npoly, but at the same

level

In the tree as npoly; Jout

Is constructed

If an element

In the IN

array exists.

Iftln -

Node position of first polygon In

IN array that

polygon npoly contains.

Iftout -

The left most node

*************************************************************

Subroutine settpl(npoly)

Common /newtopo/Infnew(100),1upnew(100),1dwnew(100),

&1Ifnew(100)

,1rtnew(100)

Common /neighbors/lent,In(100),Jcnt,Jout(100)

Common /state/If last,Iftln,Iftout, ndpstn,lup

* Start by moving the left and right pointers of all

the

"neighbors" of npoly In

the tree.

If (Jcnt.GT.0) Then

If (If l

ast.eq.0.and.iup.gt.0)

Do 35

J=l ,Jcnt

If (J.EQ.l) Then

1lfnew(Iftout)*If last

Else1lfnew(Jout(J))»Jout(J-l )

1dwnew(1up)=lftout

148

End If

CIf

IJ.EQ.Jcnt) Then

1rtnew(Jout(Jcnt))*ndpstn

1 Ifnew(ndpstn) JoutlJcnt)

Else1rtnew(JoutlJ)>-JoutlJ+l )

End If

35 Continue

11fnew(ndpstn)«Jout(Jcnt)

If I I

flast.gt.0) Irtnewllflast) = l

ftout

Else If

ljcnt.eq.0) Then

1 Ifnew(ndpstn)*If last

If (Iflast.gt.0) IrtnewlIf last)-ndpstn

If (If l

ast.eq.0.and.1 up.gt.0) 1dwnew(lup)»ndpstn

End If

CInfnew(ndpstn)«npoly

1 upnew(ndpstn)*1 up

1dwnew(ndpstn)«IftIn

Irtnewl ndpstn )!E0

Cc

- Move the up,

left, and right pointers of

those objects now

c contained

In polygon npoly (I.e.

have ndpstn as

a parent).

CIf

(1cnt.gt.0) then

Do 40

1=1,lent

lupnewl1n(1))«ndpstn

If (1.EQ.1) Then

1lfnew(lft1n)-0

Else1Ifnewl1n(1))»1nl1-1 )

End If

CIf

I 1.EG.lent) Then

Irtnewl1n(1))=0

ElseIrtnewl1n(1)) = 1nl1 + 1 )

End If

40

Continue

End If

CReturn

End

C +

C softky -

SOFT KeY -

Sets the sending of

soft key definitions

C (*0'-d1sable,>1'^enable).

C-£ *************************************************************

Subroutine softky(comd)

Character com*3,comd*l

Ccom-'Rm'//comd

Ca11 esccom(com)

CReturn

End C +£ ************************************************************

C spfcom -

Driver for

special function mode.

Options are:

CC 1 49

C c

= Copy a

polygon (and

parameters)

« » '

m = Move a

polygon to a

new position)

r = Rotate a

polygon about a

specified origin and

by a

prescribed theta.

h =

Help

q - Quit and return to polygon ADD/CHANGE/DELETE/

EDIT mode.

r*********

Subroutine spfcorn?ttest)


CCall enhmsgl**** Special functions mode *** )

C Cans-'h'

1test«0

Do 10

whlleMtest.EQ.0)

quest**

Special function mode (c/m/r/h/q)'

1 va 1 = 1aquesttquest,ans, Ma2 ) ' ,2 )

CIf

(ans.EQ.*C'.OR.ans.EQ.'c* )

Then

Call cpyply(lerror)

Else If

(ans.EQ.'M*.OR.ans.EQ.'m') Then

Call movplyl lerror )

Else If

(ans.EQ.'R'.OR.ans.EQ.'r') Then

Call rotplyllerror)

Else If

(ans.EQ.'H*.OR.ans.EQ.'h' )

Then

Call hlpspf

Else If

(ans.EQ.'Q'.OR.Ival.EQ.-l.OR.ans.EQ.'q') Then

ltest*l

ElseCal1 errmsg

End If

ans='q'

10 End Do

CReturn

End

C +

C stdout - Creates a

Denver Standard grid output file.

C-

\*

Subroutine stdoutIItest)

Common /grIdspecsZ/1d2,pgm2,nc2,nr2,nz2,xo2,dx2,yo2,dy2,

&1proJ2,cm2,bl2

Common /gr1dspecs/1d,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,bl


Character ulabel*15,quest*80,grdnam*80,modnam*80,modgrd*80

Character 1d2*56,pgm2*8,ans*2,iddum*80,1d*56,pgin*8

CC -

Ask

If user want to use an already existing grid.

CIflag=l

Ca11 msgstd

quest=' Do you wish to use a

prexlsltlng grid (y/n/q)'

Call askqst(ans.quest,1 test)

If (1test.EQ.-l.OR.ans.EQ.*Q')Go To 100

If (ans.EQ.'Y') Iflag = 2

C C -

Ask for model grid's name

quest=' Model grid'

"150

Call asknamCmodgrd,quest,1 test)


CC -

If a

prexlstlng grid Is

used read 1t

In and test Its

grid specs

CIf

( If lag.EQ.2) Then

Call redwrMmodgrd, Itest)

Call testspecs(Itest)

If (Itest.LE.-l)Go To 100

ElseCall copyspecs

End If

CC - ASK FOR GRID ID.

Cquest-'

Id*

Call asknam(Iddum,quest,Itest)


ileng=1tlen(Iddum)

1d2=1ddum<1:56)

CC -

Ask for grid dval

CIf

(Iflag.EQ.1)Call askdv1<dval,Itest)

If (Itest.EQ.-l>Go To 100

CC -

Ask for which set of parameters (FARM* arrays) to use In

C setting the grid

CCall askval(Iset,ulabel,Itest)


CC -

Initialize wrkgrd to dval

CIf

(Iflag.EQ.1)Call Intwrk(dval)

CC - Walk the tree and set the grid

CCall setgrdtIset,Itest)

CC - Write out the grid to the user specified file

CCall wrtgrddnodgrd,Itest)

C100 Continue

Return

End

C +

C stoply -

Stores the polygon xpoly,ypoly 1n

the screenloc array

C at position npoly.

C-w

Subroutine stoply(xpoly,ypoly,nbrpts,npoly,Itest)

DlmensIon xpoly(nbrpts),ypoly(nbrpts)


Cnump1y( npoly )«= n

brpts

Do 10

1=1.nbrpts

xscr(npoly,1)=xpoly(1)

yscr(npoly,1)

Bypoly(1)

10 Continue

CReturn

151

End

r * **i

storeold - Stores all

the polygon Information associated with

npoly In

the oldcoord common block.

I*************************************************************

Subroutine storeold(npoly,1 test)

Common /oldcoord/noId,xold(100),yold(100),x1no1d(100),

&y1nold<100),xoutold(100),youtold(100),xm1nold,xmaxold,ym1nold,

&ymaxold,partmp(10)

Common /screenloc/ntotal,numply(100),xscr(100,100),yscr<100,100)

Common /box/xm1nbx(100),xmaxbx(100),ym1nbx<100),ymaxbx(100)


&yout(100,100)

Common /parameter /parm<100,10)

Common /commands/nmax,eps1ln,delIn,delout

Common /max/nptmax

If (npoly.GE.1.AND.npoly.LE.nmax) Then

nold*numply(npoly)

If (nold.GE.1.AND.nold.LE.nptmax) Then

xm1nold

isxm1nbx( npoly)

xmaxo1d=xmaxbx{npoly)

ym1nold=ym1nbx(npoly)

ymaxold = y

maxbx< npoly)

Do 10

1=l,nold

xold(1)*xscr( npoly,1)

yold(1)*yscr(npoly,1)

x1nold(1)=x1n(npoly,1)

y1nold(1)=y1n(npoly,1)

xoutold(1)*xout(npoly,1)

youtold(1)=yout<npoly,1)

10 Continue

Do 20

J=l,10

partmp< J)*parm(npoly,J)

20

Continue

Itesfl

ElsePrint *,'

Error, number of

points for

polygon',npoly,

& ' out of

range*ltest«-l

End If

ElseCall

wrtmsg(' Polygon number out of

range')

1test--l

End If

Return

End

t ** *i tangle - Turning ANGLE

PURPOSE.

Determines the turning angle (relative heading change)

THETAD

In degrees when going from the line

segment

(xl,yl)-(x2,y2) to

the line

segment (x2,y2)-(x3,y3)

Using the equation:

c**2*a**2+b**2-2.0*a*b*cos(alpha)

where a,b are the distances from the corner (xl,yl)

(x2,y2) and (x2,y2),(x3,y3) respectively; and the

turning angle Is

defined as:

thetad-180.0-a1pha

FORM.

Cal1 tanglelthetad.xl,y1,x2,y2,x3,y3>

PARAMETERS.

THETAD

- Turning angle In

degrees.

(xl,yl),(x2,y2),(x3,y3)

- End points of line segments.

NOTEt

The THETAD returned Is

a positive number between 0.0

and 180.0 degrees; TANGLE does not make a

distinction

between a

left or

right turn.

************************************************************

Subroutine tangle(thetad,xl,yl,x2,y2,x3,y3)

Ca=sqrt((x2-xl)**2+(y2-yl)**2)

b=sqrt((x3-x2)**2+(y3-y2)**2)

c*sqrt((x3-xl)**2+(y3-yl)**2)

CIf

(a.LT.1.0e-18)a=l.0e-18

If (b.LT.1.0e-18)b=l.0e-18

Cthetad*acosd((c**2-<a**2+b**2 ))/(2.0*a*b))

CReturn

End

C +\*C

tester - Starting at polygon (LPOLY), tester walks the tree

structure and returns the polygon number (NPOLY) and

the corner of this polygon (NCORN) closest to the

point (x,y).

*************************************************************

Subroutine tester(npoly,ncorn,lpoly,x,y,1 test)




&11eft(100),1r1ght(100)

Common /commands/nmax,eps11n,del 1n,delout

Common /max/nptmax

Parameter (vaxmln*-!.7e+38,vaxmax=l.7e + 3

8 )

Character lowup*3

npoly=0

ncorn=0

If (Ipoly.GE.l.AND.Ipoly.LE.nmax) Then

1te

st=

01

po

ly=

Ipo

ly1 c

orn

= 01co

rn2=

01

se

t=0

1set2

=0

np

oly

l=0

nco

rn 1 =

0

... 1

C "Z

np

oly

2=

0

{ 0 J>

nc

orn

2=

0

dmln-vaxmax

dm 1n2 = v

axmax

CDo 10 whlle(1test.EQ.0)

Call tstbndC1n-ut,x,y,Ipoly)

If (Inout.EQ.1) Then

nbrpts

=enumply( Ipoly)

If (nbrpts.GE.1.AND.nbrpts.LE.nptmax) Then

Do 30 1«1,nbrpts

xpoly(1)«xscr(Ipoly,I)

ypoly(1) = y

scr(Ipoly, 1)

30

Continue

CC -

Test the polygon by using both the limited and unlimited

C versions of subroutine clspnt.

CIflag«0

Cal1 clspnt(Icorn,d1st,x,y,xpoly,ypoly,nbrpts,delout,

&

Iflag)

If Ug2-l

Cal1

c Ispnt(1corn2,d1st2,x,y,xpoly,ypoly,nbrpts,

&

delout,If lag?)

If < I

corn.GT.0.AND.dlst.LT.dmln) Then

npoly1«Ipoly

ncornl*Icorn

dm1n«d1st

1set«i

End If

If ( 1

corn2.GT.0.AND.d1st2.LT.dm1n2) Then

npoly2*Ipoly

ncornZ

581corn2

dm1n2*d1st2

1set2=l

End If

CC -

If the point (x,y) was not within the radius used for

C the limited version of clspnt, then test to see

If the point

C Is

Inside of the polygon currently under test.

CIf

(1corn2.EQ.0) Then

Call piytst(xpoly,ypo1y,nbrpts,x,y,1nout2)

Call fndply(ngon,Ipoly>

If (1nout2.EQ.1> Then

next=1down(ngon)

Elsenext-1r1ght(ngon)

End If

If (next.LE.0) Then

If {1set2.EQ.1) Then

npoly=npoly2

ncorn=ncorn2

1test=l

Else If

( Iset.EQ.1) Then

npoly=npoly1

ncorn=ncorn1

Itest'l

Else1test=-l

End If

Else1poly«1nfo(next)

End If

* t~

A Else If

{ Icorn.GT.0.OR. 1corn2.GT.JBT)

Then

I b 4

Call fndp1y(ngon,Ipoly)

If (ngon.GE.1) Then


If (next.EQ.0.0R.ftest3.EQ.0) Then

If ( I

setZ.EQ.1) Then

npo1y=npo!y2

ncorn=ncorn2

ttest*!

Else If

(Iset.EQ.1) Then

npoly^npolyl

ncorn=ncorn1

1test=l

ElsePMnt *, *

f 1test=-l

End If

Else1polyaInfo(next)

End If

ElsePrint *,'

Error, ngon not found*

1test=-l

End If

ElsePrint *,'

Error encountered

tn clspnt at polygon*,

&

tpoly,* and corner * *,1corn

1test=-l

End If

ElsePrint *,*

Error

In polygon *,tpoly*

&

* nbrpts out of range'

1test»-l

End If

Else If

(tnout.EQ.0> Then

Call fndp1y<ngon,Ipoly)

next«1r1ght(ngon)

If (next.LE.0) Then

If (IsetZ.EQ.l) Then

npoly=npoly2

ncorn=ncorn2

1test=l

Else If

(Iset.EQ.1) Then

npoly=npolyl

ncorn = n

corn 1

ltest=l

Else1test--l

Print *,'

Test bound routine*

Print *,*

*print *,*

Sorry, could not find your polygon*

End If

Elselpoly»lnfo(next)

End If

ElsePrint *,'

Error encountered 1n

tstbnd at polygon',Ipoly

1test»-l

End If

10

End Do

ElsePrint *,*

Error, lpolya*,Ipoly,' passed to tester out of range*

1test--l

End If

Return

155

End

r ** *i

testoff - Tests the polygon xpoly.ypoly to see if

at least one

corner point of the polygon

is Inside or

outside of a

given window.

Window Is

defined as x,y:

x1eft-<x«<xrIght

ybot*<y=<ytop

Intotal

« Flag giving result of test.

> 1,

at least one point Is

within window

* 0,

polygon Is

outside of

window

-!» error

In parameters passed to routine.

r****************************************

Subroutine testoff(xpoly,ypoly,nbrpts,xleft,xr1ght,ybot,

&ytop,f ntota1)

DImensIon xpoly(nLrpts),ypoly(nbrpts)

If ((nbrpts.GE.1).AND.(xleft.LE.xr1ght).AND.(ybot.LE.ytop)> Then

I ntota1=0

Do 10

1*1.nbrpts

If ((xpoly(1>.GE.xleft.AND.xpolyl1).LE.xrIght>.AND.

&

(ypoly(1>.GE.ybot.AND.ypoly(1>.LE.ytop))1ntota1=1ntota1+1

10 Continue

ElseCall wrtmsg(' Error

In TESTOFF, boundary conditions or

nbrpts

&

Illegal')

1 ntota1 = -1

End If

Return

End

***

testopo

- Test the polygon passed

In the xtemp,ytemp to see If

It will fit Into the topology arrays.

If not, restores

the old polygon Information stored

In the oldcoord

common block.

r*************

Subroutine testopo(npoly,1test)


&1left(100),1rIghtt100)

Common /oldcoord/noId,xoldf100),yoldt100),xInoldt100),

&y1no1d(100),xouto1d(100),youtold(100),xm1no1d,xmaxo1d,ym1no1d,

&ymaxo1d,partmp(10)

Common /temp/ntemp,xtemp(100),ytempC100)

Common /screen 1oc/ntota1,numply(100),xscr(100,100),yscr(100,100)

Common /box/xm1nbx(100),xmaxbx(100),ym1nbx(100),ymaxbx(100)


&yout(100,100)

Common /parameter/parm(100,10)

Common /state/If 1ast,Iftln,Iftout,ndpstn,tup

Common /commands/nmax,eps11n,de11n,de1out

Common /max/nptmax


Common /Junk/ngbtop,Jnktopl100),ngbloc,Jnkloc{100)

Common /zoom/1 zoom,1zva1,nzoom,ncm1nz(5) ,ncmaxz(5),nrm1nz(5),

&nrmaxz(5)


Common /f111/open,sol Id,f1Ityp

156

Character open*! ,so1 1d*l ,f 1ltyp*l , pi y

clrM , b

lack*! ,white*!

Character 1ntype*1,ans*2,ans2*2

ltest-0

If (ntotal.GT.0.AND.npoly.GT.0) Then

Store the old polygon Information Into

the oldcoord common block.

Call storeold(npoly,1test3)

Delete the old polygon Information associated with npoly.

ntota1=ntota1 -1

If (ntotal.LT.0) ntotal=0

ngbloc=ngbloc+l

ngbtop=ngbtop+1

1err3=2

Call deltpl(npoly,1err3)


Call wrtmsgC'

Error

In testopo routine*)

1test=-lGo To 100

End If

Call delloc(npoly,1err3)

- Find the available polygon position npo1y2.

Call fndnum(npoly2)

- Test polygon In

xtemp,ytemp.

Call fndtopnew(ntop)

Call fndtpl<npoly2,ntop,1test2)

If ( 1

test2.EQ.1) Then

ntota1=ntota1+1

Call stop 1

y(xtemp,ytemp,ntemp,npo1y2,1err3)

Ca11 fndbbx< xmln,xmax,ym1n,ymax,xtemp,ytemp,ntemp,

& delout)

xm1nbx(npoly2)=xm1n

xmaxbx(npo1y2)=xmax

ym1nbx(npoly2)=ym1n

ymaxbx(npoly2)=ymax

Call fndbpl(npoly2,1err3)

Do 95

1 1 = 1 , 10parm< n

poly2,11)=partmp(11)

95 Continue

Map the new topology structure onto the old topology arrays.

Call newold

- Undraw the old polygon and draw the new polygon.


Do 50 1=1,nold

Cal1 trans<xold<1),yold<1),xold<1),yold<1))

50

Continue

Do 55

J=l,ntemp

Call trans< xtemp(J),ytemp(J),xtempiJ),ytemptJ))

55 Continue

End If

- Cnp and

undraw the old polygon.

157

Call setclr(black)

Call setfll(open)

Cal1 drwclpC xold,yoId,nold,xleft,xr1ght,ybot,ytop)

- Clip and draw the new polygon.

Call setclr(plyclr)

Cal1 drwclp(xtemp,ytemp,ntemp,xleft,xrIght,ybot,ytop)

Call setfll(solld)

1test*l

Else If

(1test2.EQ.-l) Then

- Since new polygon failed test, restore the old polygon Inform-

matlon at the position of npoly2.

ntotal*n

total+1

Cal1 stoply(xold,yold,nold,npoly2,1err2)

xm1nbx(npo1y2)=xm1nold

xmaxbx(npoly2)=xmaxold

ymlnbxC npoly2 )«!ym1 n

old

ymaxbx(npoly2)-ymaxold

- Restore the Inner and outer bounding polygon Info.

Do 60 JJ = 1

,nold

Xln(npoly2,JJ)=x1nold(Jj)

y1n(npoly2,jj)=y1nold(Jj)

xout(npoly2,jj)=xoutold(jJ)

yout(npoly2,jj)=youtold(jj)

60

Continue

- Restore the paramter Info.

Do 65 J«l . 10

parm(npoly2,J)=partmp(j)

65 Continue

- Map the old topology structure back onto the new topology array

1nfo(ndpstn)=npoly2

Cal1 oldnew

1test=-l

End If

End If

00

Continue

Return

End

***testspecs -

Test the grid specifications In

the two common blocks

grldspecs and gr1dspecs2 for the matching of

essential

parameters.

************

Subroutine testspecs(1 test)

Common /grIdspecs/1d,pgm,nc,nr,nz,xo,dx,yo,dy,1proj,cm,bl

Common /gr1dspecs2/1d2,pgm2,nc2,nr2,nz2,xo2,dx2,yo2, dy2 ,

&1proj2,cm2,bl2

Character 1d*56,1d2*56,pgm*8,pgm2*8

If ((nc.EQ.nc2).AND.lnr.EQ.nr2)) Then

1test=l

158

ElseCall

wrtmsgt' Error TESTSPECS, grid specifications do

not

& match')

1test*-l

End If

CReturn

End C +wC

totalt

- Computes the total turning angle In

degrees of

the

C given polygon.

The ' t

ota 1

turning angle Is

the sum

C of

the Individual heading changes when moving from

C corner point to corner point around a

polygon.

C-W

Subroutine total t ( g

amma , x

poly,ypoly, nbrpts)

Dlmens ton

xpolyf nbrpts ) , y

poly( nbrpts )

theta=0.J&

Do 10

1 = 1 , nbrpts

If (1.EQ.1) Then

1back=nbrpts

1next=2

Else If

< 1 .EG. nbrpts) Then

1back=nbrpts-l

1next=l Else1back*1-l

1next-1+l

End If

xl^xpolyt Iback )

yl»ypoly( Iback)

x2=xpoly( 1 )

y2*ypoly( 1 )

x3=xpoly( Inext )

y3=ypoly( Inext )

Compute the next relative heading change when going from the line

segment

( xl ,yl ) , ( x2,y2 )

to ( x2 ,y2 ) , ( x3 ,y3 ) .

Cal 1 tang1e(theta ,xl,yl,x2,y2,x3,y3)

To determine If

the heading change was to the left

(counter-clockwise

or the right (clockwise), construct the components of

two

vectors A

and B,

and compute their cross-product.

Since the

vectors are In

a plane the k

(or z)

components of

the vectors

will be zero.

Ax=x2-xl

Ay=y2-yl

Bx=x3-x2

By=y3-y2

Now compute the cross-product; since the

k (or

z) components of

the vectors A and

B are zerro we need only compute the k

(or z)

component of

vector C.

Cz=Ax*By-Ay*Bx

We make the following definitions:

| J /

Cz > 0.0 - Relative heading change was to the left.

Cz < 0.0 - Relative heading change was to the right.

If (Cz.GT.0.0> Then

par1ty=-l.0

Else If

(Cz.LT.0.0) Then

par 1ty-1.0

Elsepar 1

ty«0.0

End If

gamma*gamma+par1ty*theta

10 Continue

Return

End

trans

- Transforms a

coordinate (xold.yold) from the normal

unzoomed screen to

a zoomed screen (xnew,ynew).

**************************************************************

Subroutine trans(xnew,ynew,xold,yold)

Common /subgrld/lcmln,Icmax,Irmin,1rmax,ncm1n,ncmax,nrm1n,nrmax



xorg*1wcorg+(ncmln-1)*nxorgp

yorg*Jwcorg*(nrmln-1)*nyorgp

xnew»1wc0+(xold-xorg)*nxp1x/nxorgp

ynew*Jwc0+(yold-yorg)*nyp1x/nyorgp

Return

End

f**************************************************************

tstbnd

- Test the location xtest,ytest to see If

It Is

within the

bounding box around polygon npoly.

Inout »

Flag for

point being Inside or

outside of

box.*

1 -

Point

Is Inside bounding box

* 0 -

Point

Is outside of

bounding box

«-l -

npoly passed to

tstbnd out of

range.

**************************************************************

Subroutine tstbnd(1nout,xtest,ytest,npoly)

Common /box/xmlnbx <. 100) , x

maxbx( 100) , ym 1 nbx ( 100) ,ymaxbx( 100)

Common /commands/nmax,eps1In,deli n.del o

ut


1nout=0

If ((xtest.LE.xmaxbx(npoly)).AND.(xtest.GE.xmlnbx(npoly)).AND

& (ytest.LE.ymaxbx(npoly)).AND.(ytest.GE.ymlnbx{npoly)))1nout=l

Else1nout=-1

:{nd If

Return

- -id

********************************************

«***M**««W1t«ll1tKIIII«ll««««ll«********M*********«*K**««««««««««1t«

~

f

-

tstend

- TeST END

- Tests the endpolnts of

the line

(xl.yl),

'60

(x2,y2) for mapping onto region 0000 (See "Principles

of Interactive Computer Graphics", by Newman and

Sproull, figure 5-5, page 66.)

Region 0000 Is

defined as any x,y:

xleft

< x

< xrlght

ybot

< y

< ytop

Inout

Value describing properties of pair

3 Both points

In region 0000

2 point (x2,y2) within region 0000

1 point (xl.yl) within region 0000

0

line segment crosses region 0000 (endpolnts

are outside)

-1 «

line segment

Is entirely off screen

Subroutine tstend(Inout,xl,yl,x2,y2,xleft,xrIght,ybot,ytop)

Cal1 fndcdel1one4,1one3,1one2,lonel,xl,yl,xleft,xrIght,ybot,ytop)

Call fndcde<1two4,1two3,ItwoZ,Itwol,x2,y2,xleft,xrIght,ybot,ytop)

nsuml* lone4+1one3+1one2+lonel

nsum2-1two4+1two3+1two2+Itwol

1nout«-1

If ((nsuml.EQ.0).AND.(nsumZ.EQ.0)) Then

1nout»3

Else If

(nsuml.EQ.0) Then

1nout*1

Else If

(nsum2.EQ.0) Then

1nout«Z

Else1count*0

If ((1one4.EQ.1).AND.(1two4.EQ.1)) Then

1 count*1 count*1

End If

If ((1one3.EQ.l).AND.(1two3.EQ.l)) Then

1count=1 count*1

End If

If ((loneZ.EQ.1).AND.(ItwoZ.EQ.1)) Then

1count=Icount*1

End If

If <(lonel.EQ.l).AND.(Itwol.EG.1)) Then

1 count"1 count*1

End If

If (lcount.EQ.0) Then

delx«x2-xl

dely*yZ-yl

If (abs(delx).LT.l.e-16) de1x=sign(1.e-16,delx)

If (abs(dely).LT.l.e-16) dely=s1gn(1.e-16,dely)

slope=dely/delx

b=y2-slope*x2

Do 10

1=1,2

If (1.EQ.1) Then

xtest*xleft

Else

161

xtest«xrIght

End If

ytest*slope*xtest+b

If (ytest.GE.ybot.AND.ytest.LE.ytop) 1nout»0

10 Continue

Do 20 J-1,2

If (J.EQ.l) Then

ytest«ybot

Elseytest*ytop

End If

xtest*(ytest-b)/s1 ope

If (xtest.GE.xleft.AND.xtest.LE.xrIght) 1nout-0

IB Continue

End If

End If

Return

End

tstpgn

- TeST PolyGoN -

Tests the two polygons npoly and

(xtemp,ytemp), under control of Icon, for whether

one polygon Is

inside, outside, or

if they cross.

Icon

* Input flag controlling how polygon comparlslons

are made.

* 1

« Tests

If polygon (xtemp,ytemp)

Is within

polygon npoly (xscr,yscr)

* 0 «

Tests

If polygon npoly (xscr,yscr)

is with

in polygon (xtemp,ytemp)

Inout

Flag describing whether a

polygon Is

Inside,

outside, or crosses another polygon.

* 1

* Inside

* 0 * outside

*-l *

cross

Subroutine tstpgn(Inout,npoly,icon,Itest)

Dimension xtest(100),ytest(100),xpoly(100),ypoly(100)

Common /commands/nmax,epsiIn,delin,delout


Common /screenloc/ntcta1,numply{100),xscr(100,100),yscr{100,100)


ItestM


If (Icon.EQ.1) Then

10

Do 10

xtest( ytest(

Cont Int

Do 20

xpolyl

ypoly(

88 1 , ntemp

)»xtemp( 1 ) )«y tempt 1 )

je1»1 ,nbrpts

1 ) sxscr ( npol y , 1 1 )

1 )»yscr ( npoly, 1 1 )

162

20

Continue

ncount-ntemp

npp*nbrpts

Else If

(lcon.EQ.0) Then

Do 30 J=l,nbrpts

xtest(J)»xscr(npoly,J)

ytest(J)*yscr(npoly,J)

30

Continue

Do 40 JJ-l,ntemp

xpoly(JJ)*xtemp(JJ )

ypoly(JJ)»ytemp(JJ)

40

Continue

ncount^nbrpts

nppsntemp

Else1test«-l

Call wrtmsg(* Error In

tstpgn. Icon was not

1 or 0')

Go To 100

End If

nout=0

n 1n=0

Do 50 k-1.ncount

Cal1 plytst(xpoly.ypoly,npp,xtest(k),ytest(k),Ireslt)

If (Ireslt.EQ.0) Then

nout=nout+l

Else If

(Ireslt.EQ.1) Then

n1n=n1n+l

End If

50

Continue

If (nout.EQ.ncount) Then

1nout»0

Else If

(nIn.EQ.ncount) Then

1nout*l

Else1nout=-1

End If

ElseCall wrtmsgl* Error, npoly not In

the range: l»<npoly»<nmax')

1test«-l

End If

100 Continue

Soturn

End

tstseg

- Tests two line segments [x1,y1],[x2,y2] and txtl.ytl],

Cxt2,yt2] to see If

they cross.

The test consists of:

(1) Comparing sides for overlap of their range

and doma 1.n.

(11) If

sides overlap from (1),

calculate the

Intersection point (xlnt.ylnt).

(111) Determine If

the Intersection point lies In

the overlap of the sides' ranges and domains

163

ncross

* Flag telling

if sides cross

= 1

* sides cross

» 0 *

sides do not cross

Author: Bruce A.

Chuchel, USGS, Menlo Park, CA. ,

1/85

-************************************************************

Subroutine tstseg(ncross,xl,yl,x2,y2,xt1,yt1,xt2,yt2)

ncross*0

- For the side Joining the points Cxl.yl] and Cx2,y2] construct

the domain and range Intervals [xlow,xup] and [ylow.yup]

x1ow*am1nl(xl,x2)

ylow*am1nl(yl,y2)

xup-amaxl(xl,x2)

yup*amaxl(yl,y2)

txlow-amlnl(xtl ,xt2)

tylow-amlnl(ytl,yt2)

txup«amaxl(xtl,xt2)

tyup^amaxl(ytl,yt2)

- Test (1)

If ((txlow.GE.xlow.OR.txup.GE.xlow).AND.

&{txlow.LE.xup.OR.txup.LE.xup).AND.

&(tylow.GE.ylow.OR.tyup.GE.ylow).AND.

&(tylow.LE.yup.OR.tyup.LE.yup)) Then

rr-- Determine the slope (dely/delx), and y-axls Intercept (b),

of the line segment between the points Cxl,yl] and [x2,y23.

delx«x2-xl

de1y«y2-yl

If (abs(delx).LT.1.0e-l6)delx=sIgn(1.0e-16,delx>

If (abs(dely).LT.1.0e-16)dely=s1gn(1.0e-IG.dely)

b-yl-xl*(de1y/delx)

- Test (11)

tdelx-(xt2-xtl)

tde1y-(yt2-ytl)

If (abs(tdelx).LT.1.0e-l6)tdelx-s1gn(1.0e-16,tdelx)

If (abs(tdely).LT.1.0e-16)tdely=s1gn(1.0e-16,tdely)

tb-ytl-xtl*(tde1y/tdelx)

d Iff-((dely/delx)-{tdely/tdelx))

If (abs(dIff).LT.l.0e-16)dIff=s1gn(1.0e-16,dIff)

x1nt-(tb-b)/d1ff

y1nt»x1nt*(de1y/de1x)+b

- Test (111)

Now test (x1nt,y1nt) for being In

the Intervals bounded

by Cxlow,xup],Cylow,yup] and Ctx1ow,txup],Ctylow,tyup]

If ((x1nt.GE.xlow.AND.x1nt.LE.xup).AND.

& (ylnt.GE.ylow.AND.ylnt.LE.yup).AND.

& (xlnt.GE.txlow.AND.xfnt.LE.txup).AND.

&

(ylnt.GE.tylow.AND.ylnt.LE.tyup)) Then

ncross=1

End If

End If

Return

End

r***i

tstxcr

- Tests whether the polygon given

In xtemp.ytemp array

overlaps on

the polygon npoly.

The test consists of:

(1) Comparing sides In

pairs for

overlap of

their

range and domain.

(11) If

sides overlap, calculate the Intersection

point (x1nt,y1nt).

(Ill) Determine If

the Intersection point lies

In the overlap of

the sides' ranges and domains

ncross

s Flag telling If

polygons overlap

s 1

= polygons overlap

* 0 * polygons do not

overlap

npoly

* Pointer to polygon In

xscr,yscr arrays

Subroutine tstxcr(ncross,npoly)



1test«0

ncross=0

.tbrp

ts*n

um

ply

( np

oly

)

- Start the counter (1)

for the side of

the polygon npoly.

Do 10

wh11e(1t»st.EQ.0.AND.1.GE.l.AND.1.LE.nbrpts)

If (1.EQ.nbrpts) Then

xlsxscr(npoly,nbrpts)

yl^yscr(npoly.nbrpts)

x2ssx

scr(n

poly

, 1 )y2=yscr(npoly,1)

Elsexl^xscr(npoly,I)

yl^yscr(npoly,1)

x2S!xscr ( n

poly, 1 + 1 )

y2*yscr(npoly,1+1)

End If

- For

the side of

the polygon Joining the points (xl,yl) and

(x2,y2) construct the domain and range Intervals [xlow.xup],

Cy1ow,yup].

xlow=amInHxl ,x2)

ylow=am1nl(yl,y2)

xup=amax1(xl,x2)

yup=amaxl(y1,y2)

- Determine the slope (dely/delx), and y-axls Intercept (b),

of the line

segment between the points (xl,yl) and (x2,y2).

delx=x2-xl

165

dely=y2-y1

If (abs(delx).LT.1.0e-l2)delx=s1gn(1.0e-12,delx)

If (abs(dely).LT.1.0e-12)dely=sIgn(1.0e-12,dely)

b=yl-xl*(dely/delx)

CC - Now start searching through the xtemp,ytemp array and do the

C tests outlined above.

Start the counter (lent)

for the side

C of

polygon In

xtemp,ytemp.

CIcntM

Do 20 whlleCltest.EQ.0.AND.lent.GE.1.AND.lent.LE.ntemp)

If (Icnt.EQ.ntemp) Then

xt1=xtemp(ntemp)

y 11 = ytemp(ntemp)

xt2=xtemp(1)

yt2!=ytemp( 1 )

Elsextl=xtemp(lent)

ytl»ytemp(lent)

xt2=xtemp(1cnt+l)

yt2«ytemp(1cnt+l)

End If

Ctxlow=am1nl (xtl ,xt2)

tylow»am1nl(ytl,yt2)

txup'amaxl(xtl,xt2)

tyupaamaxl(ytl,yt2)

CC -

Test

( 1 ) C

If ((txlow.LT.xlow.AND.txup.LT.Xlow).OR.

A(txlow.GT.xup.AND.txup.GT.xup).OR.

4(tylow.LT.ylow.AND.tyup.LT.ylow).OR.

&(tylow.GT.yup.AND.tyup.GT.yup) )

Then

ltest-0

Else

CC -

Test (11 )

Ctdelx=(xt2-xtl)

tdely=(yt2-ytl)

If (abs(tdelx).LT.1,0e-12)tdelx=s1gn(1.0e-12,tdelx)

If (abs(tdely).LT.1.0e-12)tdely=s1gn(1.0e-12,tdely)

tb=ytl-xtl*(tdely/tdelx)

Cd1ff»((dely/delx)-(tdely/tdelx))

If (abstdlff).LT.1.0e-12)dIff-sIgn(1.0e-12,d1ff)

Xlnt»(tb-b)/d1ff

y1nt-x1nt*(dely/delx)+b

CC - Test (111)

C Now test (xlnt.ylnt) for

being In

the Intervals bounded

C by [xlow,xup],[ylow,yup] and [txlow,txup],Ctylow,tyup]

CIf

<(xlnt.GT.xlow.AND.xInt.LT.xup).AND.

& (ylnt.GT.ylow.AND.ylnt.LT.yup).AND.

& (xlnt.GT.txlow.AND.xInt.LT.txup).AND.

& (ylnt.GT.tylow.AND.ylnt.LT.tyup)) Then

ncross=1

1test=l End

If End If

If (ncross.EQ.0)lent*1cnt+l

20 End Do

If { Itest.EQ.JB) 1-1 + 1

10 End Do

Return

End

'**** unzcom -

Driver to redraw unzoomed grid on Envision terminal.

l**AA**A**AA*********A***i

Subroutine unzcom(1 test)

Common /mlsc/ncol,nrow,f1rst,ntop,If 1rst

Common /orIginal/Iwcorg,Jwcorg,nxorgp,nyorgp

Common /subgrld/lcmln,1cmax,Irmin,1rmax,ncm1n,ncmax,nrmln,nrmax

Common /scale/xsc,ysc,xstart,ystart,x1n1t,y1n1t

Common /sea lef a

cts/ 1wc0, Jwcfl, n

xp 1 x, n

yp 1 x ,p I

xdlm

Common /zoom/Izoom,Izval,nzoom,ncm1nz(5>,ncmaxz(5),nrm1nz(5),

&nrmaxz(5)




Character piyclr*l,black*!,white*!,open*l,sol1d*l,f11typ*l

Character first*!

1test»l

ItestZ-l

If (IfIrst.EQ.l) Then

Call Intscr

Call clrsgdC1,ItestZ)

If

( 1te

st2

.GE

.JB

T)

Th

en

C

all

clr

ply

If 1rst=

J0f 1

wc

org

= 1w

cJ0f J

wc

org

= JwcJ0f

nxo

rgp

=n

xp

1x

nyo

rgp

=n

yp

1x

End If

ElseCall Intscr

Call clrsgd(J0f, I

testZ)

Call clrply

End If

If (ItestZ.GE.0) Then

1 zoom=0

xstart*ncm1n

ystart=nrm1n

xsc»floatlnxplx)

yscafloatlnyplx)

Call setbnd

End If

If ( I

testZ. GE.J0T. A

ND. mdf lag. EQ. 1 )

Then

Call setclr(plyclr)

Call selftl(open)

Call drawwalk


End If

If (ItestZ.LT.0)1test-1test2

Return

End

UPSHIFT - Converts lowercase to uppercase.

All non-lowercase characters unchanged.

1 / "7

CALL UPSHIFT(A)

A

A character string of any length

Author: Richard W. Saltus, USGS, Denver, CO.

SUBROUTINE UPSHIFTtA)

CHARACTERM*) A, UP* < 2

6 ) , D

OWNM 26 )

UP*'ABCDEFGHIOKLMNOPQRSTUVWXYZ'

DOWN*'abcdefghlJkImnopqrstuvwxyz'

ILEN=LEN(A>

DO 10 I-l.ILEN

INUM»INDEX(DOWN,A<1:1))

IF (INUM.NE.J0) A< I : I )

=UP( INUM: INUM)

10

CONTINUE

RETURN

END

C +£ *************************************************************

valchg - Allows the changing of the parameterss associated with

polygon npoly.

npoly *

Polygon number (1-nmax)

»

Iset *

Sets which arrays

In parm* arrays are to

be reset.

= 0 »

All parameters (1-10) will be prompted for

1

- 10 »

Prompts only for the one parameter

selected

*************************************************************

Subroutine valchg(npoly,Iset,Itest)

Common /commands/nmax,eps1 In,del1n,delout



Character label(10)*15,ulabel * 1

5,quest*80

CIf


1test=0

If {1set.EQ.0) Then

1event=0

1cnt=l

Else If

(Iset.GE.1.AND.Iset.LE. 10)

Then

1 event* 1

1cnt=1set

ElsePrint *,*

Error, Iset

out of

range'

1test»-l

End If

CC -

Print quit message

CCall

wrtmsg(* Enter //

when done asslglng parameters to

& thIspolygon')

CDo 10 while(Itest.EQ.0)

plyval=parm(npoly,lent)

ulabel*label(lent)

Cquest=ulabel//' parameter'

1val=1rquest{quest,plyval,'(el5.8)',15)

168

If (fval.EQ.l) Then

parm(npoly,lent >«plyval

Else If

Mval.EQ.-l) Then

1test«-l

End If

1cnt«1cnt+l

If (1 e

vent.EO.l.OR.Icnt.GT.10.AND.1test.NE.-l)1test«l

10 End Do

ElseCall wrtmsg(* Error, npoly out of range')

1test=-l

End If

Return

End

r**«n

watt

- Watts for user to enter a

carriage return before

contInuIng.

>**********!

Subroutine wait

Character ans*l

Write (6,10)

10 Format (/,'

Enter a

carriage return <CR> to contInue:',$)

Read (5,20)ans

20 Format (al)

Return

End

walk

- Starting at the position of polygon NGON

In the tree

(topology array), WALK returns the node position of the

next polygon 1n

the tree.

The walk proceeds as follows:

(1) Move down the (sub)tree on the 'left* side, by

looking at 1down of the current position.

If this

Is not zero return this as the next polygon.

(2) When a polygon

Is not found 'below' the current

position (Idown

Is zero), look to the right of

this position and test:

(a) If

a polygon

1s found on the right, return

this polygon.

(b) If

a polygon

1s not found on the right, move

up a

level and reapply test (a).

(3) When no more polygons are found to the right and

above the current position, the tree has been

completely searched.

Variables:

next

ngon

=

Next polygon

1n tree

>0 =

a polygon exists

0 =

«_ree has been exhausted

Position 1n

tree where walk

Is to start

(ngon must be greater than zero).

169

C Itest *

Error flag

C 1

st Next polygon was found

C 0 *

No more polygons

C -1

» A value In

tree Is

less than 0.

CC Note: ngon and next are pointers to positions In

the

C topology arrays.

CC-(*

Subroutine walk(next,ngon,Itest)

Common /topology/ 1nfo(100),1 upper(100),1down(100),

& 11eft< 100) , 1

Mght< 100)

Common /commands/ nmax,eps11n,del1n,delout

Cnext*0

If (ngon.ge.1.and.ngon.le.nmax) then

npnt=ngon

next=1down(ngon)

If (next.GT.0) then

1test=lElse If

(next.EG.0) Then

next*1r1ght(ngon)

If <next.GT.0) Then

1test=lElse If

(next.EG.0) Then

1test2=0

1 = 1Do 20 wh11e(1test2.EQ.0)

npnt^lupperCnpnt)

If (npnt.GT.0) Then

next=1r1ght(npnt)

If (next.GT.0) Then

1test=l

1test2*l

Else If

(next.EG.0) Then

1test2=0

Else1test2=-l

1test=-l

print *,'

Error, Irlght was out of range (1r1ght<«0)'

End If

Else If

(npnt.EQ.0) Then

next=0

1test=0

1test2=l

Else1test=-l

1test2=-l

print *,'

Error,

1 up of ',npnt,' less than zero'

End If

1-1 + 1 If

(I.GT.nmax) Then

print *,*

Error,

1 (counter) was >',nmax

ltea.--l

1test2--l

End If

20

End Do

Elseprint *,'

Error, Irlght of

f,npnt,' was less than zero'

1test=-l

End If

Elseprint *,'

Error, Idown of ',ngon,' was less than zero'

1test«-l

End If

Elseprint *,'

Error, NGON passed to WALK out of range*

1test*-l

End If

CReturn

End C +£ **************************************************************

C wcbp - World coordinate byte packing.

Converts a world co-

C ordlnate pair Into the (hexadecimal) code required for

C the Envision terminal.

See wcbp.lnf and Envision manual

CC Author: Robert Slmpson, USGS, Menlo Park, CA, 10/83.

C-£ **************************************************************

Character*5 Function wcbp(1,j)

Character blank*!

Parameter (1max=l6284,jmax*16284)

Parameter

( 1m1n=*0, Jm1n=J0)Parameter (blank** ',Iblank* 1 c

har( '

')) C C

- Force 1,J

Into bounds...

11n»m1n(1max,max(Imln,1))

j1n-m1n(jmax,max(Jmln,J))

C - Get hi

and lo

bytes and offset with blank...

11o-mod(11n,64)+1b1ank

1med*11n/64+1blank

Jlo=mod(J1n,64)+1blank

Jmed« Jln/64-Hblank

C -

Put bytes together...

wcbp-blank//chart1med)//char(1lo)//char(Jmed)//char(Jlo)

CReturn

End

C +£

**************************************************************

C wrhead - Writes the header for a

standard grid (new version).

CC Author: Robert W.

Slmpson, USGS, Menlo Park, CA.

CC-^

**************************************************************

Subroutine wrhead(un1t,1d,pgm,nco1,nrow,nz,

&xo,dx,yo,dy,IproJ,cm,b1,1 test >


Integer unit

C1test*lWrite (un1t)1d,pgm,nco1,nrow,nz,xo,dx,yo,dy,IproJ,cm,bl

CReturn

EndC +Q

**************************************************************

C wrtgrd - WRlTe GRID

- Writes out wrkgrd as

a Denver standard

C grId f1le to 'name'.

C-^ **************************************************************

Subroutine wrtgrdfname,1 test)

Common /work /wrkgrd '. 2

50000 )


171

&1proJ2,cm2,b12

Character name*80,1d2*56,pgm2*8

C1test-l

pgm2«'polygon

* dummy=0.0

Open (11,f1le«name,status*'new',form» * u

nformatted')

Cal1 wrhead(11,1d2,pgm2,nc2,nr2,nz2,xo2,dx2,yo2,dy2,1proj2,

&cm2,b12,Itest)


Do 20

J«l,nr2

WrIte (11)dummy,(wrkgrd(1+(J-l)*nc2),t=l,nc2)

20 Continue

End If

Close (11)

C100

Continue

Return

End

C +£

*************************************************************

C wrtmod - Writes out a

Polyogn model file.

CCC-\*

Subroutine wrtmod(Itest)


&11eft(100),1r1ght(100)




Common /commands/nmax,eps11n,delIn,del out



Common /gr I

dspecs/1d,pgm,nc,nr,nz,xo,dx,yo,dy,1proJ,cm,bl


CCharacter 1abe1<10)* 15

Character Id*56,pgm*8,grdnam*80,modnam*80,modgrd*80

COpen (10,f1le=modnam,status-* unknown',forma * f

ormatted *,

Acarrlagecontrol*'1 1st')

CC - Write out the current parms assigned to standard grid header

C Information.

CC write (10,5) Id,pgm,nc,nr,nz

C5 format(x,a56,x,a8,3(x,13))

C write (10,10) xo,dx,yo,dy

C10

format(4(x,«15.8))

C write (10,15) 1proJ,cm,bl

CIS

format(x,13,2(x,e!5.8))

CC - Write out the number of

polygons

In the model and the

C labels assigned to the parm arrays.

CWrite (10,20)ntotal

20 Format (x, 13)

Write (10,25)(label(k),k»l ,5)

Write (10,25)(label(k),k=6,10)

25 Format (5(x,al5))

C - Write out the polygon number, the number of

points

in this

1 /jC

C polygon, the grid locations and the polygon parms.

Cdelxcn=dx/nxorgp

delycn^dy/nyorgp

Do 60 1=1,nmax

npolye1nfo(1)

If (npoly.GT.0> Then


Write (10,33)npo1y,nbrpts

33 Format (2<x,l3>)

Write

( 10,35)(parm(npo1y,kk),kk=l,5)

Write (10,35) (parm(npoly,kk),kk = 6

,10)

35 Format (5(x,el5.8))

Do 40

J= 1 .nbrpts

xgr1d*xo+((xscr(npoly,J)-Iwcorg)*delxcn)

ygr1dsyo+((yscr(npoly,J)-Jwcorg)*delycn)

Write (10,45>xgrId,ygrId

45 Format (2(x,el6.8)>

40 Continue

End If

60 Continue

CC - Write out the topology structure

CDo

70 ndpstn«l,nmax

Write (10,65)1nfo(ndpstn),1 upper(ndpstn),1down(ndpstn),

&1left(ndpstn),1r1ght(ndpstn)

65 Format (5(x,l3))

70 Continue

CClose (10)

1test»l

Return

End C +£ **************************************************************

C wrtmsg - Writes out a

text string to the terminal.

C-£ **************************************************************

Subroutine wrtmsg(text)

Character textM*)

C1leng-ltlen(text)

Write (6,10)text

10 Format (x,a<11eng»

CReturn

EndC +£

**************************************************************

C zomcom -

Zoom command mode.

Controls the function of

zooming

C and unzoomlnlng In

the grid.

CC

Options:

CC c

= Clear zoom stack

C d

= Draw the grid using a

zoom value selected from the

C stack.

C r

* Recall and draw the grid using the zoom values

C

currently pointed to In

stack by nzoom.

C s

- Select a

subgrld (using mouse, cursor, grid

C coords.)

C u

- Unzoom grid, draw full

grid on

screen (does nothing

1 "7 7

C to zoom values)

I / .3

h *

Help message

q * Quit and return to Polygon command level

Subroutine zomcom(If 1rst,1 test)

Character ans*2,quest"80,zcom*2,fIrstM

Common /subgrld/lcmln,Icmax,1rmln,1rmax,ncm1n,ncmax,nrm1n,nrmax

Common /scale/xsc,ysc,xstart,ystart,xIn It,yIn It

Common /zoom/Izoom,Izval,nzoom,ncmlnz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)

Common /sealefacts/1wc0,Jwc0,nxp1x,nyp1x, p1xd1m

Common /orIglnal/Iwcorg,Jwcorg,nxorgp,nyorgp





Character plyclr*!,black*l,white*!,open*l,sol1d*l,f11typ*1

Character mcflag*2,votflg*2

Call enhmsg('*** Zoom mode ****)

- Testing of Input variables goes here

zcom-'H'

Iflag-0

Do 10

whlleCIflag.EQ.0)

quest"' Zoom command (c/d/r/s/u/h/q) '

Ival81aquest(quest,zcom,'(a2)',-2 )

If (zcom.EQ.'C') Then

Call askans(ans)

If (ans.EQ.*Y') Then

Cal1 Intzom

Call setbnd

Else If

(ans.EQ.'Q*) Then

If lag«-l

End If

Else If

{zcom.EQ.'D') Then

If (nzoom.GE.l) Then

Cal1 zompck(Itest)


Call dtspla

Call scaleg2sc(0)

Call clrsgd(0,Itest)

xstart^ncmln

ystart»nrm1n

Call setbnd

End If

If (mdflag.EQ.1.AND.Itest.GE.0) Then

Call setclr(plyclr)

Call setfll(open)

Call drawwalk

Call setf IKsol Id)

End If

ElseWrite (6,50)

50

Format (/,'

Sorry, zoom stack

Is empty...',/)

End If

Else If

(zcom.EQ.'S') Then

If (IfIrst.EQ.1) Then

Cal1 tntscr

Call c1rsgd(1,Itest)

Cal1 clrply

174

xscsfloat{nxp1x)

yscsfIoat(nyp1x)

1wcorg=1wc0

Jwcorg-Jwc0

nxorgp«nxp1x

nyorgp«nyp1x

Call setbnd

End If

If (mdflag.EQ.LAND.IfIrst.EQ.l) Then

Call setclr{plyclr>

Call setfll(open)

Call drawvtjlk


End If

If 1rst«0

20

Continue

Call asktyp(Itype,Itest)

If {Itest.EQ.-l)Go To 30

If (nzoom.EQ.5)Ca11 zomstk(Itest)

If {Itest.EQ.-l)Go To 30

If Mtype.EQ.l) Then

Call getsublItest)

Else If

<Itype.EG.2) Then

Cal 1

asksub(Itest)

End If

If (Itest.EQ.1)1zoom*l


30

Continue

If {Itest.GE.0) Then

Call dlspla

Cal1 sca1eg2sc(0)

Call c1rsgd(0,Itest)

xstart«ncm1n

ystart=nrmfn

Call setbnd

End If

If (mdflag.EQ.LAND.Itest.GE.0) Then

Call setclr<plyclr)

Call setftl(open)

Call drawwalk


End If

Else If

{zcom.EQ.'R') Then

If (nzoom.GE.l) Then

Call zomrcl(Itest)


Call dlspla

Call sca1eg2sc(0)

Call clrsgd(0,Itest)

Call clrply

xstart«ncm1n

ystart^nrmln

Call setbnd

End If

If (mdflag.EQ.1.AND.Itest.GE.0) Then

Call setclr(plyclr)

Call self 11(open)

Call drawwalk

Call self 11(sol Id>

End If

ElseWrite (6,50)

End If

Else If

(zcom.EQ.'IT )

Then

Call unzcomlItest)

Else If

(zcom.EQ.*H*) Then

Ca 1 1

hIpzom

Else If

(zcom.EQ.'Q'.OR.Ival.EQ.-l) Then

If1ag=-l

ElseCall errmsg

End If

zcom»'Q'

10 End Do

CIf

( Iflag.EQ.-l)1test--l

Return

End

C+

f A**************************************************************

C zompck - Allows the picking of a

selected zoom value from the

C zoom stack (If

any exist).

C-

Subroutlne zompck(ttest)

Common /zoom/I zoom,Izva1,nzoom,ncm1nz(5),ncmaxz(5),nrm1nz(5),

4nrmaxz(5)

Common /subgrtd/lcmln,1cmax,trmln,1rmax,ncmln,ncmax,nrm1n,nrmax

Character quest*80

CC call hlpzpk

C1test«0

Do 10

whlleCItest.EQ.0)

quest"' Stack position of zoom value (1-5, 0 or

// to quit)'

1val«t1quest(quest,1zva1,'<12)',0)

CIf

(Izval.GE.LAND.Izval.LE. 5)

Then

If (ncm1nz(Izval).EQ.0.AND.ncmaxz(Izval).EQ.0.AND.

& nrm1nz(Izval).EQ.0.AND.nrmaxzlIzval).EQ.0) Then

Write (6,15)

11 Format (/,'

Error, zoom values for this position not set',/)

Elsencm1n»ncmInz(Izval)

ncmax=ncmaxz(tzval)

nrmln*nrmlnz(Izval)

nrmax*nrmaxz(Izval)

Itest*1

End If

Else If

(Izval.EQ.0.OR.Ival.EQ.-l) Then

1test«-l

ElseCall errmsg

End If

10 End Do

CReturn

End

C +

C zomrcl

- Recalls the subgrld values from position nzoom

C In

the zoom stack.

C-

Subroutlne zomrcl(Itest)

Common /grIdspecs/Id,pgm,nc,nr,nz,xo,dx,yo,dy,IproJ,cm,b1

Common /subgrId/Icmln,tcmax,Irmln,Irmax,ncmln.ncmax.nrmln.nrmax

Common /zoom/1 zoom,Izval,nzoom,ncm1nz(5),ncmaxz(5),nrmlnz(5),

176

Jrn

rmaxz(5

) C

ha

rac

ter

1d

*56

,pg

m*8

If {n

zo

om

.GE

.1.A

ND

.nzo

om

.LE

.5)

Th

enn

cm

1n

«n

cm

1n

a(n

zoo

m)

ncmax=ncmaxz(nzoom)

nrm1n»nrm1nz(nzoom)

nrmax*nrmaxz(nzoom)

1test«l

Else If

(nzoom.EQ.0) Then

1test»0

ElseItest--!

End If

Return

End

i***izomstk - Controls the release of the zoom stack.

Called by

subroutine zomcom (ZOOM COMMAND)

If nzoom equals five,

Bottom of stack (oldest zoom values)

Clear stack (zeroes out zoom stack)

Top of stack (youngest zoom values)

Help message

Quit t.id

return to ZOOM COMMAND level.

nzoom *

Pointer to current position In

zoom stack

* 0 *

If zoom stack

Is empty.

otherwise ranges between

1 and 5.

k*************************************************************

Subroutine zomstk(Itest)

Common /zoom/Izoom,1zval,nzoom,ncmInz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)


1test«0

Cal1 msgstk

Call hlpstk

ans-'H'

Do 10

whl!e(Itest.EQ.0)

quest"' What method of stack release (b/c/t/h/q)'

1val"Iaques11 quest,ans,*(a2)',0)

If (ans.EQ.'B») Then

1test-l

Do 20 1>1,4

ncm1nz(1)»ncm1nz(1 + 1 )

ncmaxz(1)»ncmaxz( 1 + 1 )

nrmlnz(1)*nrm1nz( 1 + 1 )

nrmaxz(1)*nrmaxz(1 + 1 )

20

Continue

ncmlnzC 5 )

»0

ncmaxz(5 ) *0

nrmlnz(5)=0

nrmaxz(5 )»0

nzoom»4

Else If

(ans.EQ.'TM Then

ftest»l

ncmlnz(5)»0

ncmaxz(5)«0

\ "77

nrm1nz(5)»0

I /

/

occcccccc-c

nrmaxz(5)*0

nzoomM

Else If

(ans.EQ.'C') Then

Cal1 Intzom

1test-l

Else If


1test--l

Else If

(ans.EQ.'h") Then

Call hlpstk

ElseCall errmsg

End If

10 End Do

Return

End

zorcntr - Stores the values of ncm1n,ncmax,nrm1n,nrmax, used for

zooming,

tn the zoom stack at position nzoom.

See Intzom.for for a

description of the variables In

the zoom common block.

Subroutine zomstr(Itest)

Common /zoom/Izoom,Izval,nzoom,ncminz(5),ncmaxz(5),nrm1nz(5),

&nrmaxz(5)

Common /subgrId/Icmin,Icmax,Irmln,1rmax,ncm1n,ncmax,nrm1n

tnrmax

If" (nzoom.6C.If,AN6.nzoom.Lf.§) then

1test-l

nzoomanzoom+1

ncminz(nzoom)

ancm In

ncmaxz(nzoom)«ncmax

nrm1nz(nzoom)=nrm1n

nrmaxz(nzoom) nrmax

Else If

(nzoom.GE.5) Then

Call wrtmsgC' Zoom stack

Is full')

1test»-l

End If

Return

End

178

POLYGON - Program Listing by - USGS · 2010. 12. 8. · USGS-OFR-85-233-B USGS-OFR-85-233-B UNITED...

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Transcript of POLYGON - Program Listing by - USGS · 2010. 12. 8. · USGS-OFR-85-233-B USGS-OFR-85-233-B UNITED...