_getHandleCount _getHandlePoint _getHandleType _hitTestBox _isHandleFixed _load _output _points _save _setHandlePoint _subtype angle center endPoint getPoints getSubType isBeeline isRayline length setBeeline setEndPoint setRayline setStartPoint startPoint

setStartPoint() void MgLine::setStartPoint ( const Point2d &  pt ) 设置起点，未调 update()