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https://blog.youkuaiyun.com/u012138730/article/details/79927778
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https://blog.youkuaiyun.com/u010608964/article/details/82533064
判断点是否在多边形内(任意多边形)
https://blog.youkuaiyun.com/u012138730/article/details/79927778
AutoCAD二次开发&判断点是否在多边形内部
https://blog.youkuaiyun.com/u010608964/article/details/82533064