def main():
"""
This program simulates a bouncing ball at (START_X, START_Y)
that has VX as x velocity and 0 as y velocity. Each bounce reduces
y velocity to REDUCE of itself.
"""
global times,switch,VY
ball=GOval(SIZE,SIZE,x=START_X,y=START_Y)
ball.filled= True
ball.fill_color='black'
window.add(ball)
switch = False
onmouseclicked(turn_on)
while True:
pause(DELAY)
if switch==True:
VY+=GRAVITY
ball.move(VX,VY)
pause(DELAY)
if ball.y>window.height:
VY=-REDUCE*VY
if ball.x>window.width:
ball.x=START_X
ball.y=START_Y
times +=1
if times>=3:
break
else:
pass
def circles():
"""
Draw circles in Fibonacci sequence.
:return: Nothing.
"""
m = 1 # First number.
n = 1 # Second number.
max_n = math.sqrt(window.width**2/2) * 2 # Use window width to calculate max diameter needed.
while n <= max_n:
fib = m+n
circle = GOval(fib, fib)
circle.color = 'white'
circle.x = center_x - fib//2 # Center circle.
circle.y = center_y - fib//2
window.add(circle)
m = n # Update first number with second number.
n = fib # Update second number with sum.
return
