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判断点在多边形内，时间复杂度O(n)。用于可靠的判断一个点是否在多边形内，适用于凸多边形、凹多边形、不规则多边形等，充分考虑了点在多边形内、多边形外、多边形的某一条边上以及这个点本身就是多边形的一个顶点。

☆11Dec 7, 2017Updated 8 years ago

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