clipLine cross2Beeline cross2Line cross2LineV crossLineAbc crossLineBeeline isBetweenLine isBetweenLine2 isBetweenLine3 isColinear isColinear2 isConvex isIntersect isIntersectProp isLeft isLeft2 isLeftOn isLeftOn2 isProjectBetweenLine isProjectBetweenRayline ptInArea PtInAreaRet ptToBeeline ptToBeeline2 ptToLine

isBetweenLine3() bool mglnrel::isBetweenLine3 ( const Point2d &  a, const Point2d &  b, const Point2d &  pt, Point2d *  nearpt = (Point2d*)0  ) static 已知点pt在直线ab上, 判断点pt是否在线段ab上(闭区间) 参数 [in] a 线段的起点 [in] b 线段的终点 [in] pt 给定的测试点 [out] nearpt 在线段的两个端点中，到给定的点最近的端点，为NULL则忽略该参数 返回 在线段上时返回true，否则返回false 这是这个函数的调用关系图: