""" ChapterAnimation/buttonSquare.py 
Click button square alternate canvas colour: blue, red
"""
from graphics import *
# if pmouse over square (p1 - corner) with side = ss
def overSquare(pmouse,p1,ss): # p1 is P1 from Rectangle
    if (p1.getX() <= pmouse.getX() <= p1.getX() + ss and
      p1.getY() <= pmouse.getY() <= p1.getY() + ss):
        return True
    else:
        return False

def main():
    win = GraphWin( "Move square", 300, 300 )
    side = 40
    mysq = Rectangle( Point(10,70), Point(10+side,70+side) )
    mysq.setFill( '#ffff00')            # yellow button
    mysq.draw( win )
    countPressed = 0
    while True:
        mp = win.getMouse()
        if overSquare(mp,mysq.getP1(),side): # check if in square
            countPressed = countPressed + 1
        if countPressed % 2 == 1:
            win.setBackground("red")
        else:
            win.setBackground("blue")
                
    win.close()

main()