Erasing from graph would be possible, if erasing from graph would be possible... (Afternoon has become timewasting...)
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();
43 ///This function changes the tool in the graph-editor's hand
44 void changeEditorialTool(int);
48 //maximizing, minimizing, restoring window, etc.
49 virtual bool on_expose_event(GdkEventExpose *);
53 ///This function is responsible for the correct
54 ///reaction of any action happened in the territory
56 bool event_handler(GdkEvent* e, Node n);
58 ///actual event handler
60 ///Actual event handler should be stored, to be able to disconnect it and later reconnect it.
61 sigc::connection actual_handler;
63 ///event handler for the case when move-tool is active
64 bool move_event_handler(GdkEvent*);
65 ///event handler for the case when create_node-tool is active
66 bool create_node_event_handler(GdkEvent*);
67 ///event handler for the case when create_edge-tool is active
68 bool create_edge_event_handler(GdkEvent*);
69 ///event handler for the case when eraser-tool is active
70 bool eraser_event_handler(GdkEvent*);
72 ///Deletes the given item.
73 void delete_item(Gnome::Canvas::Item *);
75 ///The graph, on which we work
78 ///Map of nodes of graph
79 Graph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;
81 ///Map of edges of graph
82 Graph::EdgeMap<Gnome::Canvas::Line *> edgesmap;
84 ///Map of texts to write on edges
85 Graph::EdgeMap<Gnome::Canvas::Text *> edgetextmap;
87 ///Group of graphical elements of displayed_graph
88 Gnome::Canvas::Group displayed_graph;
90 ///Here we store the maps that can be displayed through properties.
91 MapStorage mapstorage;
93 ///Indicates whether the button of mouse is pressed or not
96 ///At this location was the mousebutton pressed.
97 ///It helps to calculate the distance of dragging.
98 double clicked_x, clicked_y;
100 ///Remembers which Gnome::Canvas::Item was pressed.
101 ///this variable is needed, because
102 ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
103 ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
104 Gnome::Canvas::Item * active_item, * target_item;
105 Graph::NodeIt active_node;
106 Graph::EdgeIt active_edge;
108 static const int zoom_step = 5;
111 #endif //GRAPH_DISPLAYER_CANVAS_H