ladanyi@6: // -*- C++ -*- //
ladanyi@6: 
ladanyi@6: #ifndef GRAPH_DISPLAYER_CANVAS_H
ladanyi@6: #define GRAPH_DISPLAYER_CANVAS_H
ladanyi@6: 
ladanyi@6: #include <all_include.h>
ladanyi@6: #include <mapstorage.h>
ladanyi@6: #include <libgnomecanvasmm.h>
ladanyi@6: #include <libgnomecanvasmm/polygon.h>
ladanyi@6: 
ladanyi@6: ///This class is the canvas, on which the graph can be drawn.
ladanyi@6: class GraphDisplayerCanvas : public Gnome::Canvas::CanvasAA
ladanyi@6: {
ladanyi@6:   typedef Gnome::Canvas::CanvasAA Parent;
ladanyi@6: 
ladanyi@6: public:
ladanyi@6:   GraphDisplayerCanvas(Graph &, CoordinatesMap &, MapStorage &);
ladanyi@6:   virtual ~GraphDisplayerCanvas();
ladanyi@6: 
ladanyi@6:   ///Changes the linewidth attribute according to the given map.
ladanyi@6:   ///\param mapname is the name of the map which contains the new values
ladanyi@6:   int changeLineWidth (std::string mapname);
ladanyi@6: 
ladanyi@6:   ///Changes the linecolor attribute according to the given map.
ladanyi@6:   ///\param mapname is the name of the map which contains the new values
ladanyi@6:   int changeColor (std::string mapname);
ladanyi@6: 
ladanyi@6:   ///Changes the text of line attribute according to the given map.
ladanyi@6:   ///\param mapname is the name of the map which contains the new values
ladanyi@6:   int changeText (std::string mapname);
ladanyi@6: 
ladanyi@6:   ///Callback for 'ViewZoomIn' action.
ladanyi@6:   virtual void zoomIn();
ladanyi@6:   ///Callback for 'ViewZoomOut' action.
ladanyi@6:   virtual void zoomOut();
ladanyi@6:   ///Callback for 'ViewZoomFit' action.
ladanyi@6:   virtual void zoomFit();
ladanyi@6:   ///Callback for 'ViewZoom100' action.
ladanyi@6:   virtual void zoom100();
ladanyi@6:   ///Sets the scroll region of the convas to the bounding box of the graph.
ladanyi@6:   void updateScrollRegion();
ladanyi@6: 
ladanyi@6: protected:
ladanyi@6: 
ladanyi@6:   //maximizing, minimizing, restoring window, etc. 
ladanyi@6:   virtual bool on_expose_event(GdkEventExpose *);
ladanyi@6: 
ladanyi@6: private:
ladanyi@6: 
ladanyi@6:   ///This function is responsible for the correct
ladanyi@6:   ///reaction of any action happened in the territory
ladanyi@6:   ///of the canvas
ladanyi@6:   bool event_handler(GdkEvent* e, Node n);
ladanyi@6: 
ladanyi@6:   ///The graph, on which we work
ladanyi@6:   Graph g;
ladanyi@6: 
ladanyi@6:   ///Map of nodes of graph
ladanyi@6:   Graph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;
ladanyi@6: 
ladanyi@6:   ///Map of edges of graph
ladanyi@6:   Graph::EdgeMap<Gnome::Canvas::Line *> edgesmap;
ladanyi@6: 
ladanyi@6:   ///Map of texts to write on edges
ladanyi@6:   Graph::EdgeMap<Gnome::Canvas::Text *> edgetextmap;
ladanyi@6: 
ladanyi@6:   ///Group of graphical elements of displayed_graph
ladanyi@6:   Gnome::Canvas::Group displayed_graph;
ladanyi@6: 
ladanyi@6:   ///Here we store the maps that can be displayed through properties.
ladanyi@6:   MapStorage mapstorage;
ladanyi@6: 
ladanyi@6:   ///Indicates whether the button of mouse is pressed or not
ladanyi@6:   bool isbutton;
ladanyi@6: 
ladanyi@6:   ///At this location was the mousebutton pressed.
ladanyi@6:   ///It helps to calculate the distance of dragging.
ladanyi@6:   double clicked_x, clicked_y;
ladanyi@6: 
ladanyi@6:   ///Remembers which Gnome::Canvas::Item was pressed.
ladanyi@6:   ///this variable is needed, because
ladanyi@6:   ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
ladanyi@6:   ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
ladanyi@6:   Gnome::Canvas::Item * active_item;
ladanyi@6: 
ladanyi@6:   static const int zoom_step = 5;
ladanyi@6: };
ladanyi@6: 
ladanyi@6: #endif //GRAPH_DISPLAYER_CANVAS_H