'''animation2.py -- a second example of animation

Jeff Ondich, 10/8/07

Depends on John Zelle's graphics library.
'''

import time
from graphics import *


windowWidth = 600
windowHeight = 400
window = GraphWin('Animation 2', windowWidth, windowHeight)
window.setBackground(color_rgb(255, 255, 255))

radius = 40
ball = Circle(Point(radius, windowHeight / 2), radius)
ball.draw(window)

print 'Type Ctrl-C in the terminal window to make the animation stop.'
goingRight = True
while True:
    if ball.getCenter().x > windowWidth - radius:
        goingRight = False

    elif ball.getCenter().x < radius:
        goingRight = True

    if goingRight:
        ball.move(2, 0)
    else:
        ball.move(-2, 0)

    time.sleep(0.01)