又一个游戏编程的例子，这个例子仍然是图形运动的例子，但是例子的图形运动是跟随着鼠标的移动的。有点意思，但是不难，很简单，对初学者有帮助。-Another example of game programming, this example is still the example of sports graphics, but graphics examples follow the mouse movement is the movement. A bit mean, but it is not