实现活化边表多边形扫描转换算法。本程序可以实现柱状图，饼图以及多边形的扫描转换。

点击鼠标右键时会跳出系统菜单项，系统菜单包括有：画柱状图，画多边形，画饼图，清屏操作，以及设置颜色这五种功能

-Side of the table to achieve activation of polygon scan conversion algorithm. This program can be histograms, pie charts, and polygon scan conversion. Click the right mouse button menu items will jump out of the system, the system menu include: painting histogram, draw polygons, Huabing map, clear screen operation, and set the color of the five functions