phamton...@gmail.com wrote: > from Tkinter import * > window = Tk() > canvas = Canvas(window, width=500, height=500, background="green") > canvas.pack() > > def move_ball(speed_x, speed_y): > box = canvas.bbox("ball") > x1 = box[0] > y1 = box[1] > x2 = box[2] > y2 = box[3] > > if x1 <= 0: > speed_x = 0 > speed_y = 0 > > canvas.move("ball", speed_x, speed_y) > canvas.after(30, move_ball, speed_x, speed_y) > > canvas.create_oval(225, 225, 275, 275, fill="blue", tags="ball") > > move_ball(-10, 7) > > mainloop() > > where in the code should i change to make the ball bounce around forever. is it the x and y?
When the ball hits a wall you have to "reflect" it; for a vertical wall speed_x has to change: if x1 <= 0: # ball hits left wall speed_x = -speed_x elif ... # ball hits right wall speed_x = -speed_x Can you come up with the correct check for the right wall? To try if this part works correctly temporarily change > move_ball(-10, 7) to move_ball(-10, 0) so that the ball only moves in horizontal direction. Once this works handle the vertical walls and speed_y the same way. -- https://mail.python.org/mailman/listinfo/python-list