3 #ifndef GRAPH_DISPLAYER_CANVAS_H
4 #define GRAPH_DISPLAYER_CANVAS_H
6 #include <all_include.h>
7 #include <mapstorage.h>
8 #include <libgnomecanvasmm.h>
9 #include <libgnomecanvasmm/polygon.h>
11 ///This class is the canvas, on which the graph can be drawn.
12 class GraphDisplayerCanvas : public Gnome::Canvas::CanvasAA
14 typedef Gnome::Canvas::CanvasAA Parent;
17 GraphDisplayerCanvas(Graph &, CoordinatesMap &, MapStorage &);
18 virtual ~GraphDisplayerCanvas();
20 ///Changes the linewidth attribute according to the given map.
21 ///\param mapname is the name of the map which contains the new values
22 int changeLineWidth (std::string mapname);
24 ///Changes the linecolor attribute according to the given map.
25 ///\param mapname is the name of the map which contains the new values
26 int changeColor (std::string mapname);
28 ///Changes the text of line attribute according to the given map.
29 ///\param mapname is the name of the map which contains the new values
30 int changeText (std::string mapname);
32 ///Callback for 'ViewZoomIn' action.
33 virtual void zoomIn();
34 ///Callback for 'ViewZoomOut' action.
35 virtual void zoomOut();
36 ///Callback for 'ViewZoomFit' action.
37 virtual void zoomFit();
38 ///Callback for 'ViewZoom100' action.
39 virtual void zoom100();
40 ///Sets the scroll region of the convas to the bounding box of the graph.
41 void updateScrollRegion();
45 //maximizing, minimizing, restoring window, etc.
46 virtual bool on_expose_event(GdkEventExpose *);
50 ///This function is responsible for the correct
51 ///reaction of any action happened in the territory
53 bool event_handler(GdkEvent* e, Node n);
55 ///The graph, on which we work
58 ///Map of nodes of graph
59 Graph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;
61 ///Map of edges of graph
62 Graph::EdgeMap<Gnome::Canvas::Line *> edgesmap;
64 ///Map of texts to write on edges
65 Graph::EdgeMap<Gnome::Canvas::Text *> edgetextmap;
67 ///Group of graphical elements of displayed_graph
68 Gnome::Canvas::Group displayed_graph;
70 ///Here we store the maps that can be displayed through properties.
71 MapStorage mapstorage;
73 ///Indicates whether the button of mouse is pressed or not
76 ///At this location was the mousebutton pressed.
77 ///It helps to calculate the distance of dragging.
78 double clicked_x, clicked_y;
80 ///Remembers which Gnome::Canvas::Item was pressed.
81 ///this variable is needed, because
82 ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
83 ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
84 Gnome::Canvas::Item * active_item;
86 static const int zoom_step = 5;
89 #endif //GRAPH_DISPLAYER_CANVAS_H