python 计算一个点是否在多边形内（转）

计算方法是射线法，计算交点个数:python def isInsidePolygon(pt, poly): c = False i = -1 l = len(poly) j = l - 1 while i < l-1: i += 1 print i,poly[i], j,poly[j] if ((poly[i]

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