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CPolygonLib
- 一个封装了GPC(经典的多边形逻辑运算的库),并且包含求多边形方向、重心、多边形面积、点与多边形关系的功能-a package of GPC (Polygon classic logic operation of the library), and contains polygon seeking direction and the center, polygon area, point and polygon relations function
GPCCom
- 使用atl封装gpc,可以进行多边形的交、并,差等操作-gpc atl com wrapper