pong.py 文件源码

def create_ball(self, radius=3):
        inertia = pymunk.moment_for_circle(1, 0, radius, (0, 0))
        body = pymunk.Body(1, inertia)
        position = np.array(self.initial_position) + self.initial_std * np.random.normal(size=(2,))
        position = np.clip(position, self.dd + radius + 1, self.res[0] - self.dd - radius - 1)
        body.position = position

        shape = pymunk.Circle(body, radius, (0, 0))
        shape.elasticity = .9
        shape.color = color["white"]
        return shape