A Bouncing Ball

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Slide: 1 Copyright © AdaCore A Bouncing Ball Presented by Quentin Ochem University.adacore.com

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A Bouncing Ball. Presented by Quentin Ochem. University.adacore.com. {X = 0, Y = 100}. {X = 0, Y = 0}. {X = -100, Y = 0}. {X = 100, Y = 0}. {X = 0, Y = -100}. References to the graphical library. Declaration of a shape object with an initial value. Parameter value given by name. - PowerPoint PPT Presentation

Transcript of A Bouncing Ball

Diapositive 1Copyright © AdaCore
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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References to the graphical library
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Declaration of a shape object with an initial value
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Parameter value given by name
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Copyright © AdaCore
X is a float, so it needs a floating point literal (0.0) not integer (0)
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Copyright © AdaCore
Infinite loop
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Wait for 1 milisecond
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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then invert the step
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Move the X position of the ball
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if Get_X (Ball) > 100.0 then Step := -0.05; elsif Get_X (Ball) < -100.0 then Step := 0.05; end if; Set_X (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Identify the Errors
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Shape_Id : Ball := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Float : Step := 0.05; begin loop if (Get_Y (Ball) > 100.0) then Step := -0.05; else if Get_Y (Ball) < -100 then Step := 0.05; end if; Set_Y (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Copyright © AdaCore
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Shape_Id : Ball := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Float : Step := 0.05; begin loop if (Get_Y (Ball) > 100.0) then Step := -0.05; else if Get_Y (Ball) < -100 then Step := 0.05; end if; Set_Y (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Copyright © AdaCore
Variable are
declared like
name : type;
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Shape_Id : Ball := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Float : Step := 0.05; begin loop if (Get_Y (Ball) > 100.0) then Step := -0.05; else if Get_Y (Ball) < -100 then Step := 0.05; end if; Set_Y (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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Copyright © AdaCore
elsif introduces
an alternative
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if (Get_Y (Ball) > 100.0) then Step := -0.05; else if Get_Y (Ball) < -100 then Step := 0.05; end if; Set_Y (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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100.0 would be
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if (Get_Y (Ball) > 100.0) then Step := -0.05; elsif Get_Y (Ball) < -100 then Step := 0.05; end if; Set_Y (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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(although useless and not Ada-stylish)
with Display; use Display; with Display.Basic; use Display.Basic; procedure Main is Ball : Shape_Id := New_Circle (X => 0.0, Y => 0.0, Radius => 10.0, Color => Blue); Step : Float := 0.05; begin loop if (Get_Y (Ball) > 100.0) then Step := -0.05; elsif Get_Y (Ball) < -100.0 then Step := 0.05; end if; Set_Y (Ball, Get_X (Ball) + Step); delay 0.001; end loop; end Main;
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