Python & Pygame: Ball collision with interior of circle

Question

I\'m making a game in which balls bounce around the inside of a much larger circle. The larger circle doesn\'t move.

Here\'s the code that I\'m currently us

Answer 1

Most graphics packages use upper-left as start for drawing code. You most likely want 2 sets of coordinates, the one's you collide/move/etc with and the one's for drawing (x-radius, y-radius).

Also, without having thought about it too much, should the check for intersection be distance + ball.size >= circle.size? The balls distance from the center plus its radius should be less than the circle's radius, if I understood the setup correctly.