MFC基本矢量图形系统，实现功能包括画直线，并保存数据实现重绘

读取矢量数据文件，包括点线面文件，主要·功能有计算两点距离，计算点到线距离，计算折现段周长，计算凸多边形面积。-Read vector data files, including points, lines and documents, the main function · calculate distance between two points is calculated the point to the line, calculate the discount segment peri