本文实例为大家分享了python3射线法判断点是否在多边形内的具体代码,供大家参考,具体内容如下
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#!/usr/bin/python3.4 # -*- coding:utf-8 -*- def isPointinPolygon(point, rangelist): #[[0,0],[1,1],[0,1],[0,0]] [1,0.8] # 判断是否在外包矩形内,如果不在,直接返回false lnglist = [] latlist = [] for i in range ( len (rangelist) - 1 ): lnglist.append(rangelist[i][ 0 ]) latlist.append(rangelist[i][ 1 ]) print (lnglist, latlist) maxlng = max (lnglist) minlng = min (lnglist) maxlat = max (latlist) minlat = min (latlist) print (maxlng, minlng, maxlat, minlat) if (point[ 0 ] > maxlng or point[ 0 ] < minlng or point[ 1 ] > maxlat or point[ 1 ] < minlat): return False count = 0 point1 = rangelist[ 0 ] for i in range ( 1 , len (rangelist)): point2 = rangelist[i] # 点与多边形顶点重合 if (point[ 0 ] = = point1[ 0 ] and point[ 1 ] = = point1[ 1 ]) or (point[ 0 ] = = point2[ 0 ] and point[ 1 ] = = point2[ 1 ]): print ( "在顶点上" ) return False # 判断线段两端点是否在射线两侧 不在肯定不相交 射线(-∞,lat)(lng,lat) if (point1[ 1 ] < point[ 1 ] and point2[ 1 ] > = point[ 1 ]) or (point1[ 1 ] > = point[ 1 ] and point2[ 1 ] < point[ 1 ]): # 求线段与射线交点 再和lat比较 point12lng = point2[ 0 ] - (point2[ 1 ] - point[ 1 ]) * (point2[ 0 ] - point1[ 0 ]) / (point2[ 1 ] - point1[ 1 ]) print (point12lng) # 点在多边形边上 if (point12lng = = point[ 0 ]): print ( "点在多边形边上" ) return False if (point12lng < point[ 0 ]): count + = 1 point1 = point2 print (count) if count % 2 = = 0 : return False else : return True if __name__ = = '__main__' : print (isPointinPolygon([ 0.8 , 0.8 ], [[ 0 , 0 ],[ 1 , 1 ],[ 0 , 1 ],[ 0 , 0 ]])) |
以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持服务器之家。
原文链接:https://blog.csdn.net/sinat_36811967/article/details/78607007