判断一个点是否在多边形内C#

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//判断点在线的一边 public int isLeft(Vector2 P0, Vector2 P1, Vector2 P2) { int abc = (int)((P1.X - P0.X) * (P2.Y - P0.Y) - (P2.X - P0.X) * (P1.Y - P0.Y)); return abc; } //判断点pnt是否在region内主程序 private bool isInRegion(Vector2 pnt , List region) { int wn = 0, j = 0; //wn 计数器 j第二个点指针 for (int i = 0; i 0) { wn++; } } } else { if (region[j].Y