RE: [Pythoncard-users] Stopping an animation sequence.

[Don S. <saw...@st...>]

Rohit,

You might set up your code to run each iteration of your animation
separately and asynchronously, such as when a timer event executes. The
"flock.py" sample shows an example of this method.

I also am new to PythonCard, so if any reader of this message can =
correct my
advice, please do!

Don

> -----Original Message-----
> From: pyt...@li...=20
> [mailto:pyt...@li...] On=20
> Behalf Of Rohit
> Sent: Saturday, July 16, 2005 4:01 AM
> To: pyt...@li...
> Subject: [Pythoncard-users] Stopping an animation sequence.
>=20
> Hi,
> I have started using Pythoncard recently, so this may seem=20
> trivial. I was going through the  samples which come with it=20
> and I found the "gravity" sample, which animates a number of balls.
> I also tried to do something similar to that, but just only=20
> for one ball with one color. For this I used one button to=20
> start the animation, another button to stop it and a canvas=20
> to draw the whole sequence. In the animation sequence the=20
> program keeps on checking whether a flag variable has been=20
> altered to stop the animation or not.
> This flag variable was supposed to be altered by the stop=20
> animation button, when a mouse click occured. But when I=20
> click the stop button the animation keeps on running. I am=20
> including the code of my program.
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> [code]
>=20
> import time,random
> from PythonCard import model
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> class MyBackground(model.Background):
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>     def on_initialize(self, event):
>         self.stopAnimation=3DFalse
>         pass
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>     def on_startBtn_mouseClick(self,event):
>         event.target.enabled=3DFalse
>         self.stopAnimation=3DFalse
>         xco=3D50.
>         yco=3D0.
>        =20
>         xspeed=3Drandom.random()*60-30
>         yspeed=3Drandom.random()*60-30
>         leftedge=3D0
>         rightedge,bottomedge=3Dself.components.canvas.size
>         topedge=3D0
>         gravity=3D2
>         drag=3D0.98
>         bounce=3D0.5
>         radius=3D10
>         self.components.canvas.fillColor=3D'red'
>         prev=3D()
>         while(not self.stopAnimation):
>            =20
>             self.components.canvas.drawCircle((xco,yco),radius)
>             time.sleep(0.02)
>             self.components.canvas.clear();
>             self.components.canvas.refresh();
>            =20
>             xco=3Dxco+xspeed
>             if(xco+radius>rightedge):
>                 xco=3Drightedge-radius
>                 xspeed=3D-xspeed*bounce
>             if(xco-radius<leftedge):
>                 xco=3Dleftedge+radius
>                 xspeed=3D-xspeed*bounce
>             yco=3Dyco+yspeed
>             if(yco+radius>bottomedge):
>                 yco=3Dbottomedge-radius
>                 yspeed=3D-yspeed*bounce
>             if(yco-radius<topedge):
>                 yco=3Dtopedge+radius
>                 yspeed=3Dyspeed*bounce
>             if((int(xco),int(yco))=3D=3Dprev):
>                 break   =20
>             yspeed=3Dyspeed*drag+gravity
>             xspeed=3Dxspeed*drag
>             prev=3D(int(xco),int(yco))
>    =20
>     def on_stopBtn_mouseClick(self,event):
>         self.stopAnimation=3DTrue
>         self.components.startBtn.enabled=3DTrue   =20
>            =20
> if __name__ =3D=3D '__main__':
>     app =3D model.Application(MyBackground)
>     app.MainLoop()
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> [/code]
>=20
> Thanks for any help.
>=20
> Rohit
>=20
>=20
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