说明：  游戏是动画的延伸，只要知道了动画的原理，在动画变化时，使它根据键盘或鼠标的输入操作而变化，就是游戏了。 所以在介绍游戏编程之前，先讲讲动画
(Games are an extension of animation, as long as know the principles of animation, the animation changes, make it under the keyboard or mouse input and changes in operation, that is games. Therefore, introducing the game programming before talk about the animation)