CalcBoundBox Contains copy FromPos getEndPoint getLength getMidPoint getStartPoint Intersect Intersect IntersectAndContain isClosed LineSegment2D LineSegment2D LineSegment2D mEndPoint mStartPoint operator= operator== setEndPoint setStartPoint

getLength() double getLength ( ) const virtual 获取长度 获取二维曲线长度 重载 Curve2D .