通过鼠标点击画多边形的MFC界面.每次鼠标左击时取得当前鼠标的位置,放到point类型数组中,直到点击了鼠标右键结束,Polygon drawing by mouse click in MFC enviroment. Every time when the mouse left-click to obtain the current mouse position, into an array of point type, click the right mouse button until th