class LineTracker: public RectTracker{
public:
	int mode;
	Vector<Point> route;

	Vector<Point> TrackLine(const Point& p){
		mode=1;
		route.Clear();
		route.Add(p);
		Track(Rect(p,p),0,0);
		return clone(route);
	}
	
	Vector<Point> TrackRoute(const Point& p){
		mode=2;
		route.Clear();
		route.Add(p);
		Track(Rect(p,p),0,0);
		return clone(route);
	}

	void MouseMove(Point p, dword){
		if(mode==2 || route.GetCount()<2){
			route.Add(p);
		}
		else route[1]=p;
		Refresh();
		sync(Rect(route[0],route[route.GetCount()-1]));
	}

	void Paint(Draw& w){
		w.DrawImage(0, 0, master_image);
		w.Clip(clip & GetMaster().GetSize());
		int style=width;
		if(pattern!=DRAWDRAGRECT_SOLID){
			Color color2 = IsDark(color) ? White() : Black();
			w.DrawPolyline(route,width,color2);
			switch(pattern){
				case DRAWDRAGRECT_NORMAL:
					style=PEN_DOT;
					break;
				case DRAWDRAGRECT_DASHED:
					style=PEN_DASHDOT;
					break;
			}
		}
		w.DrawPolyline(route,style,color);
		w.End();
	}
	
	LineTracker(Ctrl &master): RectTracker(master){
		MinSize(Size(-100000,-100000));
		mode=1;
	}
};

	void LeftDown(Point p, dword flags){
		LineTracker tracker(*this);
		tracker.Solid();
		tracker.Width(3);
		tracker.SetColor(Blue());

		Vector<Point> res;

		if(flags&K_CTRL) res = tracker.TrackRoute(p);
		else res = tracker.TrackLine(p);
		// ...
	}