简单的矢量图形系统：基于MFC，简单包括了矢量图元（直线，矩形，圆，多边形等），对于MFC初学者和想做矢量库的朋友有一定的帮助！-Simple vector graphics system: Based on the MFC, including simple vector element (linear, rectangular, round, polygon, etc.), for beginners and want to do MFC library vector will certai