TurtleGraphics Python: Bouncing turtle off the walls?

Question

So, I am trying to make a realistic bouncing function, where the turtle hits a wall and bounces off at the corresponding angle. My code looks like this:

def boun         


        

Answer 1

Try something like this:

if not (left <= x <= right):
    turtle.left(180 - 2 * turtle.heading())
elif not (bottom <= y <= top):
    turtle.left(-2 * turtle.heading())
else:
    pass

My python syntax is a little rusty, sorry :P. But the math is a little different for a horizontal vs. a vertical flip.

EDIT:

I suspect that what is happening is your turtle is getting into a situation where it is pointing upwards and stuck above the top wall. That would lead it to just flip indefinitely. You could try adding the following conditions:

if (x <= left and 90 <= turtle.heading() <= 270) or (right <= x and not 90 <= turtle.heading() <= 270):
    turtle.left(180 - 2 * turtle.heading())
elif (y <= bottom and turtle.heading() >= 180) or (top <= y and turtle.heading <= 180):
    turtle.left(-2 * turtle.heading())
else:
    pass

If that works, there is probably a bug elsewhere in your code. Edge handling is tricky to get right. I assume that turtle.heading() will always return something between 0 and 360 - if not then it will be even more tricky to get right.