使用c预言编写的OpenGL的入门程序，实现了线框球体的旋转和移动以及视景体的自动更新-Use c predicted entry written in OpenGL applications that implement the wireframe sphere rotation and movement, as well as automatic updates of view frustum

基于Visual C++6.0，绘制Pie形图，单击鼠标可以自动更新Pie各部分颜色-Based on Visual C++6.0, drawing Pie-shaped map, click the mouse to automatically update the color of the various parts of Pie