+ virtual bool HitTest(Point);
+ virtual Vector * GetPointAt(Vector);
+ virtual void Enumerate(FILE *);
+ virtual Object * Copy(void);
+ virtual Vector GetPointAtParameter(double parameter);
+ virtual QRectF Extents(void);
+// virtual ObjectType Type(void);
+ void SetDimensionOnLine(Dimension * d = 0);
+ Object * FindAttachedDimension(void);
+
+ protected:
+ void SaveState(void);
+ bool StateChanged(void);