利用OPENGL和VC混合编程，实现窗口的分割，左边窗口设置控制命令，右边窗口绘制圆，可以改变其中心位置和半径。并且可以设置坐标旋转。-Using OPENGL and VC mixed programming, split window, left window, set the control command, Draw a circle on the right window, you can change its central location and radius. And can