def METHOD_NAME(self):
    """Updates ball and paddle coordinates based on direction and velocity."""
    for paddle in [self.r_paddle, self.l_paddle]:
        paddle.y_pos += paddle.direction * paddle.velocity
        if paddle.y_pos < 0:
            paddle.y_pos = 0
        if paddle.y_pos > self.y_length:
            paddle.y_pos = self.y_length
        paddle.update_cell()
    self.ball.y_pos += self.ball.velocity * self.ball.direction[1]
    self.ball.x_pos += self.ball.velocity * self.ball.direction[0]
    self.ball.update_cell()