实现了小球的在窗体中的移动，当小球碰到窗体边缘是按照射线方向设置路径，在timer中控制小球位置x,y的变化，很简单，大神勿喷！-Realized in the form of small balls move, when the ball hit the edge of the form is set up in accordance with the direction of ray paths in timer to control the ball position x, y chang