wxPython question

[Chris Liechti]

"joshua solomon" <jslm at earthlink.net> wrote in
news:lNRB9.2743$fY3.294687 at newsread2.prod.itd.earthlink.net: 

> Basically I have a loop within the OnPaint handler which I am using
> for bouncing a ball around on a screen. 

don't do the loop for the animation in the event handler. do it in a 
separate thread nad call Refresh() or us a wxClientDC to draw in that loop 
directly.

GUI rule 1: event handlers have to be short (in time)

so no animations and workers. use Threading instead.

> def OnPaint(self,event):
>         MyDC=wxPaintDC(self)
> 
>         MyPen=wxPen('GREEN',1,wxSOLID)
>         MyBrush=wxBLUE_BRUSH
> 
>         MyDC.BeginDrawing()
>         MyDC.SetPen(MyPen)
>         MyDC.SetBrush(MyBrush)
>         if not self.x and not self.y:
>             self.x=40
>             self.y=40
>         MyDC.DrawCircle(self.x,self.y,15)
>         self.BounceBall(MyDC)
>         MyDC.EndDrawing()
> 
> def BounceBall(self,dc):
>         import time
>         MyPen1=wxPen('GREEN',1,wxSOLID)
>         MyBrush1=wxBLUE_BRUSH
>         dc.SetPen(MyPen1)
>         dc.SetBrush(MyBrush1)
> 
>         for y in range(1,100):
>             dc.SetLogicalFunction(wxCLEAR)
>             dc.DrawCircle(self.x,self.y,15)
>             self.x+=5
>             self.y+=5
>             dc.SetLogicalFunction(wxCOPY)
>             dc.DrawCircle(self.x,self.y,15)

use time.sleep(0.1) for this:
>             t1=time.clock()
>             while 1:
>                 delt=time.clock()-t1
>                 if delt >=0.1:
>                     break

what you're doing is heating the CPU with 100% load for nothing but 
waiting...

chris

-- 
Chris <cliechti at gmx.net>