How to bounce the ball forever around the screen

Newsgroups	comp.lang.python
Date	2015-12-03 20:19 -0800
Message-ID	<ee38a39b-5d03-4715-b9d8-23ca24e91866@googlegroups.com> (permalink)
Subject	How to bounce the ball forever around the screen
From	phamtony33@gmail.com

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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?

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How to bounce the ball forever around the screen phamtony33@gmail.com - 2015-12-03 20:19 -0800
  Re: How to bounce the ball forever around the screen Peter Otten <__peter__@web.de> - 2015-12-04 09:09 +0100

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