绘制的雪人是动态旋转效果，可以依据键盘响应事件，将动画效果做出改变，该实验内容中，按‘ａ’键可以绕ｙ轴旋转，按‘ｄ’键可以绕ｚ轴旋转，按‘ｓ’轴可以绕ｘ轴旋转，按‘ｗ’键可以进行光照渲染，按‘ｑ’键或者‘Esc’键起着退出程序的作用。(The painted snowman is a dynamic rotation effect, can be based on the keyboard response events, the animation effect changes, in this experiment content, press' a' key can rotate around the y axis, press' d' key can rotate around the z axis, press' s' axis can rotate around the x axis, press' w' key can be light rendering, press' q' key or' key to play the role of exiting the program.)