""" ChapterAnimation/bubbleMouse.py
 bounce: move a circle left - right
 win.checkMouse() is false (none) and is not waiting for the mouse to click
"""
from graphics import *
winW,winH = 400,300    # window Width x Height
from math import *	#for sqrt

def distance(P1,P2):
    return sqrt((P1.getX()-P2.getX()) ** 2 + (P1.getY()-P2.getY()) ** 2) 
    
def main():
    win = GraphWin( "Bubble", winW, winH )
    radius = 30
    myc = Circle( Point(10,70), radius)
    myc.setFill( '#ffff00' )
    myc.draw( win )
    speed = 3
    while True:
        myc.move(speed, 0 )
        time.sleep(0.01)
        pc = myc.getCenter()
        if ( pc.getX()+radius > winW or pc.getX() < 0 ):
            speed = speed * -1
        pm = win.checkMouse()
        if  pm and (distance(pm,pc) < radius) :
                myc.setFill("red")
            
main()