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2014-04-19/point-in-polygon-ray-casting/
判断点是否在多边形内 — 射线法 | Loudly Learning
最近在工作中用到了这个算法，抽空做一个笔记。
判断一个点是否在多边形内部的问题在很多地方都会碰到，最常用的方法就是射线法。
射线法 以点P为端点，向左方作射线L，由于多边形是有界的，所以射线L的左端一定在多边形外，考虑沿着L从无穷远处开始自左向右移动，遇到和多边形的第一个交点的时候，进入到了多边形的内部，遇到第二个
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