利用Visual C++ 6环境下创建MFC AppWizard（EXE），建议。

利用在Visual C++ 6.0环境下创建MFC AppWizard(exe),实现以屏幕客户区中心为圆心绘制任意直线，单击裁剪和中点裁剪分别对直线进行裁剪。-Take advantage of Visual C++ 6.0 environment to create MFC AppWizard (exe), to achieve a center-screen client area centered on drawing an arbitrary line, click the mid-point of cutting and cutting to cut a straight line, respectively.