/// <summary>/// 判斷點和直線的位置關系/// </summary>/// <param name="LinePntA">直線上的一點</param>/// <param name="LinePntB">直線上的另一點</param>/// <param name="PntM">需要判斷的點</param>/// <returns></returns>private int JudgePointToLine(Point3d LinePntA, Point3d LinePntB, Point3d PntM){int nResult = 0;double ax = LinePntB.X - LinePntA.X;double ay = LinePntB.Y - LinePntA.Y;double bx = PntM.X - LinePntA.X;double by = PntM.Y - LinePntA.Y;double judge = ax * by - ay * bx;if (judge > 0){nResult = 1;}else if (judge < 0){nResult = -1;}else{nResult = 0;}return nResult;}

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轉載于:https://www.cnblogs.com/autumoonchina/p/4349797.html

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