+private:
+ std::list<ControlPoint*> _drag_points; ///< points we are dragging
+ std::list<ControlPoint*> _push_points; ///< additional points we are dragging if "push" is enabled
+ bool _drag_had_movement; ///< true if the drag has seen movement, otherwise false
+ double _drag_x; ///< last x position of the drag, in units
+ double _drag_distance; ///< total x movement of the drag, in canvas units
+ double _last_drag_fraction; ///< last y position of the drag, as a fraction
+ /** offset from the start of the automation list to the start of the line, so that
+ * a +ve offset means that the 0 on the line is at _offset in the list
+ */
+ ARDOUR::framecnt_t _offset;
+
+ bool is_stepped() const;
+ void update_visibility ();
+ void reset_line_coords (ControlPoint&);
+ void add_visible_control_point (uint32_t, uint32_t, double, double, ARDOUR::AutomationList::iterator, uint32_t);