Re: [pygame] Why does my ball vibrate?

["Ian Mallett" <geometrian@xxxxxxxxx>]

I actually got interested in the problem, and tried to recreate your code, even though you practically gave it to me.  Had to sleep though :) I'll finish when I get home.  

Anyway, as long as the physics time engine is based on your fps, any point when the window is moved will cause a drop in the fps.  I recommend timing the loop and getting an average speed going.  Then, pause the simulation if the loop time is longer than that.  That way, when you release-click, the ball will move from where it started.  

You could just forget timing and estimate, which I don't recommend if you want accuracy.  

Ian