// -*- C++ -*- //

 #ifndef BROKEN_EDGE_H

 #define BROKEN_EDGE_H

 class BrokenEdge;

 #include <all_include.h>

 #include <libgnomecanvasmm.h>

 #include <libgnomecanvasmm/polygon.h>

 #include <graph_displayer_canvas.h>

 #include <lemon/xy.h>

 class BrokenEdge : public Gnome::Canvas::Line

 {

   GraphDisplayerCanvas & gdc;

   Gnome::Canvas::Polygon * arrow;

   Gnome::Art::Point * my_points;

   ///Indicates whether the button of mouse is pressed or not

   bool isbutton;

   ///At this location was the mousebutton pressed.

   ///It helps to calculate the distance of dragging.

   double clicked_x, clicked_y;

   ///event handler for forming edges

   bool edge_former_event_handler(GdkEvent*);

  public:

   BrokenEdge(Gnome::Canvas::Group &, Gnome::Canvas::Points, GraphDisplayerCanvas &);

   ~BrokenEdge();

   void set_points(Gnome::Canvas::Points, bool move=false);

   xy<double> get_arrow_pos();

 };

 #endif //BROKEN_EDGE_H