利用OpenGL实现动画效果，本程序主要通过不断改变视口位置来模仿动画效果，同时介绍了在进行opengl绘图时所做的一些不可或缺的准备工作。-Using OpenGL to achieve animation effects, primarily through the process of changing position to mimic the viewport animation, also introduced during opengl drawing made some essential preparatory work.