+ virtual bool HitTest(Point);
+ virtual void Enumerate(FILE *);
+ virtual Object * Copy(void);
+ virtual Vector GetPointAtParameter(double parameter);
+ virtual void MovePointAtParameter(double parameter, Vector);
+// virtual void Connect(Object *, double);
+// virtual void Disconnect(Object *, double);
+// virtual void DisconnectAll(Object *);
+ virtual QRectF Extents(void);