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

isProjectBetweenLine() bool mglnrel::isProjectBetweenLine ( const Point2d &  a, const Point2d &  b, const Point2d &  pt  ) static 判断点pt是否投影在线段ab上(闭区间)