def rotate(self, angle=math.pi, center=Point.origin()):
"""Rotate the point using an angle and the point of rotation."""
self.abstract.rotate(angle, center)
point = self.abstract
point.rotate(angle, center)
vector = Vector.createFromPoint(point)
self.motion.setPosition(vector)
def onCollision(self, point):
"""React to a physical collision between two objects using the material point of collision."""
vector = Vector.createFromPoint(point)
a = vector.angle()
v1 = self.motion.getVelocity()
v2 = point.motion.getVelocity()
v1.rotate()
pm = point.mass
px, py = point.position