一个用于生成多边形最小凸包的简单程序，基本功能就是用鼠标随意画一个多边形，然后计算并生成多边形最小凸包。很难得-Minimum convex polygon of a package used to generate a simple procedure, the basic function is free to draw a polygon with the mouse, and then calculates and generates the smallest convex polygo

判断一个透镜（凹透镜，凸透镜，平面镜）合格还是不合格。-Judge a lens (concave, convex, plane mirror) qualified or unqualified.

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