+ virtual bool HitTest(Point);
+ virtual void Enumerate(FILE *);
+ virtual Object * Copy(void);
+ virtual Vector GetPointAtParameter(double parameter);
+ virtual void MovePointAtParameter(double parameter, Vector);
+ virtual QRectF Extents(void);
+ void FlipSides(void);
+
+ protected:
+ void SaveHitState(void);
+ bool HitStateChanged(void);