__init__.py 文件源码

def collide(sprite1, sprite2, collision_objects=None, original_pos=None):
        # use default CollisionObjects?
        if not collision_objects:
            collision_objects = SATCollision.default_collision_objects

        # do AABB first for a likely early out
        # TODO: right now, we only have pygame.Rect anyway, so these are AABBs
        if (sprite1.rect.right < sprite2.rect.left or sprite1.rect.bottom < sprite2.rect.top or
                    sprite2.rect.right < sprite1.rect.left or sprite2.rect.right < sprite1.rect.left):
            return None

        test = SATCollision.try_collide(sprite1, sprite2, collision_objects[0], False)
        if not test:
            return None

        test = SATCollision.try_collide(sprite2, sprite1, collision_objects[1], True)
        if not test:
            return None

        # pick the best collision from the two
        ret = collision_objects[1] if collision_objects[1].magnitude < collision_objects[0].magnitude else collision_objects[0]

        if not ret.is_collided:
            return None

        # fill in some more values in the recycled Collision object before returning it
        ret.separate[0] = - ret.distance * ret.normal_x
        ret.separate[1] = - ret.distance * ret.normal_y
        if not original_pos:
            original_pos = (sprite1.rect.x, sprite1.rect.y)
        ret.original_pos = original_pos

        return ret