""" ChapterAnimation/bounce.py
 bounce: move a circle left - right
"""
from graphics import *
winW,winH = 400,500    # window Width x Height
def main():
    win = GraphWin( "Demo: rolling car", winW, winH )
    radius = 25
    myc = Circle( Point(10,70), radius)
    myc.setFill( '#ffff00' )
    myc.draw( win )
    speed = 1
    while True:
        myc.move(speed * 0.1, 0 )
        if myc.getCenter().getX() > winW-radius or myc.getCenter().getX() < 0:
            speed = speed * -1
        
    win.close()

main()