星星的位置是随机的。该面板可以响应用户操作，当在面板上按下鼠标并且左右旋转鼠标时，星空的轨迹将会跟随鼠标的旋转方向发生改变。-The position of the stars is random. The panel can respond to user operation, when on the panel and press the mouse around the rotation, star track will follow the direction of rotation