通过OpenGL函数在视图区绘制茶壶，球何多边形，并可以设置体显示模式（点，线，实体），同时可以设置光照，阴影，反走样何改变颜色和几何变换，不愧是一个好例子。-Through the OpenGL functions in the view area map teapot, the ball Ho polygon, and can set the Display mode (point, line, entities), at the same time can be set as light,