I'm mapping quadratic equations on a Canvas. But that's irrelevant, the point is I am drawing a lot of points in a loop without returning to mainloop until the end. I want my students to see the drawing progress, so I call update_idletasks() after each tiny rectangle. ( I use to call update() and it seems to make no difference)
This is so fast at first I am tempted to put a sleep(.01) in the loop. But after a few thousand points it starts to slow down dramatically. WHy? I thought udate_idletasks would only redraw the 'damaged' portion. Maybe my approach is wrong. I was hoping to use Canvas to do some simple instructional animation, but not if I can't solve this mystery. Any help appreciated. BTW: I posted a couple days ago about rotating objects making the item stack grow. My bad, debugging bug, fixed it. -- http://mail.python.org/mailman/listinfo/python-list
