Inft1004 Lec1 Introduction Small

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INFT1004

Visual Programming

Lecture 1Introduction to Visual Programming

(Guzdial & Ericson chapter 1, 2)

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WEDNESDAYTUESDAYMONDAY THURSDAY FRIDAY

8:00 - 9:00

9:00 - 10:00

10:00 - 11:00

11:00 - 12:00

12:00 - 1:00

1:00 - 2:00

2:00 - 3:00

3:00 - 4:00

5:00 - 6:00

6:00 - 7:00

4:00 - 5:00

INFT1004

Tut4

INFT1004Tut 2

ICT3.37

ICT3.44INFT1004Lab 1

ICT3.44 INFT1004Tut 5

ICT3.44

INFT1004Tut 6

ICT3.44

Consultation ICT3.20

INFT1004Tut 3

ICT3.44

INFT1004Lecture

GP 201

INFT1004Tut 5

ICT3.44

D

avid

Ilung

Ilung

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INFT1004 - SEMESTER 1 - 2012

Week 1

Week 2

Week 3

Week 4

Week 10

Week 11

Week 9

Week 12

Mar 4

Mar 11

Mar 18

Mar 25

May 6

May 13

May 20

May 27

Assignment due3:00 Tuesday May 21

Programs, Arrays and Iteration

Working with x and y coordinates

Selection

Web, Representations, Steganography

Lists, Files and Modules

Turtles and Other Classes

Introduction

Week 13 Jun 3

Revision and Look Ahead

No formal classes

Mid Year Examination Period - MUST be available normal & supplementary period

Recess Apr 1 - Apr 7 Mid Semester Recess Period

Practical Test 2

in Lab class

Week 8 Apr 29

More Sound and ArraysWeek 7 Apr 22

Program Design and Strings

Lecture Topics and Lab topics are the same for each week

LECTURE TOPICS

Week 5 Apr 8 Practical Test 1in Lab classMore Picture Techniques

Week 6 Apr 15 Sound and Arrays

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Course coordinator / Lecturer / Tutor

Keith Nesbitt

[email protected]

ICT3.20

www.knesbitt.com

My Contact Details

Perception and cognition

Visualisation / Sonification

Computer gamesVirtual reality

Algorithms and Patterns

Creativity

Research

Interests


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Ilung Pranata

[email protected]

ICT3.17

Information Security

Trust

PrivacyCloud computing

Digital environments

Research

Interests

Tutor

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David Cornforth

[email protected]

Tutor

Data Mining

Neural Networks

Evolutionary ComputationHealth informatics

Complex Systems

Multi agent system

Research

Interests

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The University has given you a studentmail address.

Use it. If the Uni wants to contact you, it does sovia this address.

Technically, Uni staff are not permitted to reply to

email apparently from a student, but from someother address.

Your Contact Details

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Technically, Uni staff are not permitted to reply to

email apparently from a student, but from someother address.


If you dont want touse the studentmailsystem regularly, setyour account toforward to yourpreferred address . . .


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Technically, Uni staff are not permitted to reply toemail apparently from a student, but from someother address.


. . . andremember

to log in and deletemail now and then,so that your mailboxdoesnt fill up andreject any furtherincoming messages.

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Assessment

Practical test 1

15%

Practical test(in lab class week 5)worth 15%

practice test in week before

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Assessment

Practical test 1

15%

Practical test 2

15%

Practical test(in lab class week 5)

worth 15%


Practical test 2(in lab class week 9)worth 15%

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AssessmentPractical test(in lab class week 5)worth 15%


Programming assignment(due by start of week 11 lecture)

worth 20%

students may work in pairs for this assignment

Practical test 1

15%

Practical test 2

15%

Assignment

20%



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Assessment

Practical test 1

15%

Practical test 2

15%

Assignment20%

Final examworth 50%

make sure youve available for the whole ofthe exam period (normal and supplementary)

Final Exam

50%

Practical test(in lab class week 5)worth 15%


Programming assignment(due by start of week 11 lecture)

worth 20%

students may work in pairs for this assignment


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Assessment

Practical test 1

15%

Practical test 2

15%

Assignment20%

Final Exam

50%

Students must

attain 50% overallto pass the course

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Text Book

Introduction to Computing and

Programming with Python (3rd edn)

Mark Guzdial & Barbara Ericson

(Pearson, 2013)

Offers explanatory text

and worked examples.

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Text Book

Every Week

Read and understand theexplanations.

Complete the examplesand activities.

Be sure you have acomfortable command of

the language features


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Myth Busters #1

The lectures will sometimes use completely

different examples, to offer you alternativeexplanations of the topic.

Therefore you should both attend the lectures

andread and work through the book.

I don't need a Textbook

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Myth Busters #2

No - I am a Lecturer

If you look in a mirror you will see the teacher.

The textbook is very handy to help thisprocess.

I am a Teacher

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Myth Busters #3

Email works well

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Myth Busters #3

Email works well


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Myth Busters #3

This is not an online course although many

materials will be available on Blackboard.

It is assumed that you are attending lecturesand labs.

You should see me during these times.

Email works well

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Blackboard

Note - lectures and tutorial information is here.

It contains weekly lab notes and exercises (even

for week 1) - It contains lecture slides

You will submit assignments through blackboard(Cover sheets will be submitted as hard copy).

It contains an electronic copy of the course outline

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Blackboard

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Course outline

Note the bits about handing in work late.

Note the bits about what to do if your work isaffected by illness or other acceptableadverse circumstances. (You will follow thesame process for all assessment items)

The lecture topics in the course outline areindicative only and may vary so you shouldcheck the course Blackboard website weeklyfor course updates, bulletins, and additionalresources


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Rest of course outline

Note what it says about plagiarism, which theUni takes very seriously.

Note the different dates for withdrawing fromthe course, and think about what they mightmean to you.

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INFT1004 Visual Programming

This course will teach you to

test and document your program solutionsaccording to suitable standards.

code the solution algorithm in a specificprogramming language (Python)

comprehend a programming problemand design a solution algorithm

Analyse the

problem

Design the

solution

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Analyse theproblem

Implement

the code

Design thesolution

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Analyse theproblem

Implement

and documentthe code

Test the code

solves the problemand meets standards

Design thesolution


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Analyse the

problem

Implementand document

the code

Test the codesolves the problem

and meets standards

Design the

solution

The first of these is generally the hardest;

some people find it all but impossible.

Lets give it a try right now!

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Problem solving

Making a piece of toast

What are the steps involved? (sequence)

Are there decisions to make? (selection)

What if you work in a

breakfast bar and need to

make 10 pieces of toast? (iteration)

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programming is

something

that you need to

practice!!

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How to Surf ?

1. Paddle really fast when a wave is coming.2. Stand up when you have caught the wave.

3.Turn a bit, get tubed, do some air etc.

4. If the wave closes out then jump off!


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How to Surf ?

Who feels like they can surf now?

Well programming is just like this

I can tell you how to do it and it might even

seem pretty easy (its not)

- YOU NEED TO PRACTICE!

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programming is

something

that you need to

practice!!

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Programming Programming is deciding on a set of instructions

that will get the program to do the required job,then writing those instructions in the form required

by the computer (recipe).

It often also involves a debugging processintended to eliminate problems in the program(which can sometimes be a frustrating and lengthy

experience). You cannot learn to program by reading and

watching; it takes incredible amounts of practice.

Programming courses almost always take moretime per week than any other courses.

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by the computer.

It often also involves a debugging processintended to eliminate problems in the program(which can sometimes be a frustrating and lengthy

experience). You cannot learn to program by reading and

watching; it takes incredible amounts of practice.


Analyse theproblem

Implement

and documentthe code

Test the code

solves the problemand meets standards

Design thesolution


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by the computer. It often also involves a debugging process

intended to eliminate problems in the program(which can sometimes be a frustrating and lengthy

experience).

You cannot learn to program by reading andwatching; it takes incredible amounts of practice.


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by the computer. It often also involves a debugging process

intended to eliminate problems in the program(which can sometimes be a frustrating and lengthy

experience).

You cannot learn to program by reading andwatching; it takes incredible amounts of practice.


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Traditional or object-oriented

Traditional

programming

Object-oriented

programming

a program is a

long sequence ofinstructions, often

involving choice

and repetition.

consists of lots of

objects (things), eachof which can have its

own little sequences

of instructions.

PROGRAMTriangle_Ar eaIMPLICITNONETYPE triangle

REAL:: a,b, cENDTYPE triangleTYPE(triangle):: tPRINT*,'Welcome,please enterthe&

& lengthsofthe 3sides.'READ*,t%a,t%b,t%cPRINT*,'Triangle''sarea: ',Area(t)

CONTAINSFUNCTIONArea(tri)IMPLICITNONEREAL:: Area !functiontypeTYPE(triangle),INTENT(IN):: triREAL:: theta,heighttheta = ACOS((tri%a**2+ tri%b**2-tri%c**2)/ (2.0*tri

%a*tri%b))height = tri%a*SIN(theta); Area = 0.5*tri%b*height

ENDFUNCTIONAreaENDPROGRAM Triangle_Area

Picture

width

height

Picture

width

height

Picture

width

height

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Traditional or object-oriented

Traditional

programming

Object-oriented

programming

a program is a

long sequence ofinstructions, often

involving choice

and repetition.

consists of lots of

objects (things), eachof which can have its

own little sequences

of instructions.

PROGRAMTriangle _AreaIMPLICITNONETYPE triangle

REAL:: a,b,cENDTYPE triangleTYPE(triangle):: tPRINT*,'Welcome,please enterthe&

& lengthsofthe 3sides.'READ*,t%a,t%b,t%cPRINT*,'Triangle''sarea: ',Area(t)

CONTAINSFUNCTIONArea(tri)IMPLICITNONEREAL:: Area !functiontypeTYPE(triangle),INTENT(IN):: triREAL:: theta,heighttheta = ACOS((tri%a**2+ tri%b**2-tri%c**2)/ (2.0*tri

%a*tri%b))height = tri%a*SIN(theta); Area = 0.5*tri%b*height

ENDFUNCTIONAreaENDPROGRAM Triangle_Area

Picture

width

height

Picture

width

height

Picture

width

height


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Python is object-orientedObject-oriented

programming

consists of lots ofobjects (things), eachof which can have its

own little sequencesof instructions.

Python is object-oriented

(well be dealing with objects right from the start)

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Names are important

Many of the objects well deal with have names.

Names are really important, because when we tell

the program, say, to display a picture, we need totell it which picture to display.

If weve given that picture a name, this is easy.

Soon well give it a try . . .

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Names are important

If weve given that picture a name, this is easy.

Soon well give it a try . . .

pLecturer

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Python, Jython, JES

There are many, many programming languages

Some are easy to learn; others are widely used

professionally; others are for very specific purposes . .


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Python, Jython, JES

Were going to use Python, a language that is

easier than some to learn, and is used fairly widely,especially with web applications

The version were using is called Jython It is

Python written in another language called Java

(Python is typically written in C another language)

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Python, Jython, JES

Were using it in an environment called JES

(Jython Environment for Students)

which includes

lots of featuresfor programming

with pictures

and sounds

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Downloads

You can download JES (ver 4.3) and related bits

and pieces from the Media Computation site atGeorgia Tech, where the textbooks authors work

http://code.google.com/p/mediacomp-jes/

Its all pretty easy to install (Windows or Mac)

More detail is given on the notes for week 1

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JES

mac version

program area

command area


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The JES panes

The top pane of JES is called the program

area; thats where well write programs

The bottom pane is called the command area;thats where we can type individual commands

for JES to execute immediately

program area

command area

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The JES panes

For this week, all the typing we do in JES will

be in the command area

We can also configure JES (Window Layoutmenu) to show a help area or a watcher area

(which well explain later)

program area

command area

This is also called the

interactions area

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JES and ObjectsIn JES, type file1=pickAFile() and press Enter

Choose a picture file, eg beach.jpg, from themediasources folder that goes with the textbook

You now

have an

object called

file1, andthat object is

a file

(ie an object of

type file)

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JES and ObjectsType pic1=makePicture(file1) and press Enter

You now have another object called pic1, and that

object is a picture


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JES and Objects

Note you will have to type show(pic1) to

see the picture

Everything in a programming environment hasa type: file and picture are just two examples

of types (classes)

Different types (classes) can have different

things done with them

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= doesnt mean equals

The = symbol is one of the trickiest concepts in

programming

x = y does not mean x is equal to y

It means take the value of y (whatever that is) and

assign it to the thing called x

y

x

4x = y

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= doesnt mean equalsThis is called an assignment statement

Its an instruction, not a statement of fact

Once this one has been done, the variable called x will

have the same value as y

The assignment statement takes the value of whats on its

right and assigns it to the variable on its left

y

x

4 y

x

4

4

x = y

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Print has nothing to do with printers

Python has a print command

In the lower pane, the command area, type

print(file1)

and then type

print(pic1)

Print doesnt send things to the printer; it

displays them on the screen


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Print has nothing to do with printers

With objects, it doesnt display the object itself; it

displays information about the object

With simpler things, like numbers, it displays

them directly try...

print(13)

print(-8.275)

print("My name")

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Jython can do maths

Here are some things to try and to work at understanding:

print(513 * 25)

simon = 513 * 25

print(simon)

keith = "That is my name"

print(keith)

print(2 + 5 * 8)

quotient = 13 / 2

print(quotient)

print(13.0/2)

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Weve just met some more types

integer a whole number

float a number with a decimal point (even if thedecimal point is followed by zeros)

string a sequence of characters enclosed in

quotation marks

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Weve just met some more types

Weve also reinforced that different types can havedifferent things done with them

Division of two integers always gives an integer resultDivision of two numbers when at least one is a floatgives a float result

Dont forget this, or youll be puzzled now and then


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Exploring pictures

You probably still have file1 and pic1; if not, go back and

get them again (see the slide called JES and objects)

explore(file1)

JES knows that this is a file, and cant be explored

explore(pic1)

See how the explore tool lets you check out each

individual pixel of a picture

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getPixel

pix = getPixel(myPic, 7, 7)

0 1 2 3 4 5 6 7

01234567


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Playing with Pixels

We can name individual pixels in the picture

pixel1 = getPixel(pic1, 32, 32)pixel2 = getPixel(pic1, 33, 33)

setColor(pixel1, yellow)


explore(pic1)

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Playing with Pixels

We can name individual pixels in the picture

pixel1 = getPixel(pic1, 32, 32)

pixel2 = getPixel(pic1, 33, 33)



explore(pic1)

Notice that when you explore the picture again, you get another

window; explore doesnt have a refresh option

Notice that you can repeat a command by using the up-arrow key toget to it

You can also edit it before repeating it

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Exploring Sounds

file2 = pickAFile()

This time pick a .wav file try ThreeWords.wav

sound2 = makeSound(file2)

print(sound2)

explore(sound2)

print(getSampleValueAt(sound2,14193))setSampleValueAt(sound2,14193,0)

explore(sound2)

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Exploring Sounds

file2 = pickAFile()

This time pick a .wav file try ThreeWords.wav

sound2 = makeSound(file2)

print(sound2)

explore(sound2)

print(getSampleValueAt(sound2,14193))setSampleValueAt(sound2,14193,0)

explore(sound2)

This is just a taste of things; well explain it more later

Next week well write our first programs


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Weekly Notes

Every week, in addition to the lecture slides and

occasional demo programs, there will be a set of notes.

These will explain whats to be done in the lab class, andgive you any additional information we think you might

require.

Youll need to do a lot of your programming at home.

The textbook tells you how to get hold of the software

well be using, but theres a simplified set of instructions

in this weeks notes.

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What to do before next week

Get JES installed on your computer

Dont just read the examples from Guzdial & Ericson; do them

Read through chapters 1 & 2 of Guzdial & Ericson:

Read my notes, (on blackboard), which correct or

comment on things the textbook says

Have a go at the problems at the end of each chapter

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Thats the end of the lecture . . .

This week there are no tutorials (labs)

You are strongly advised to bring a

USB drive to the labs, so that you can

transfer your programming workbetween the lab, other computers at

uni, and home

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Myth Busters #4

It's good to have fun. But you need to work hard.

I would advise you work hard first and play after thework is done (its hard to catch up get ahead)

Dates on the Calendar are much closer together

than they seem.

Uni is just a place to party

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