COIN-OR::LEMON - Graph Library

source: lemon-0.x/gui/graph_displayer_canvas.h @ 1474:75c6d2eb187a

Last change on this file since 1474:75c6d2eb187a was 1474:75c6d2eb187a, checked in by Hegyi Péter, 14 years ago

Edge creation is available.

File size: 3.4 KB
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1// -*- C++ -*- //
2
3#ifndef GRAPH_DISPLAYER_CANVAS_H
4#define GRAPH_DISPLAYER_CANVAS_H
5
6#include <all_include.h>
7#include <mapstorage.h>
8#include <libgnomecanvasmm.h>
9#include <libgnomecanvasmm/polygon.h>
10
11///This class is the canvas, on which the graph can be drawn.
12class GraphDisplayerCanvas : public Gnome::Canvas::CanvasAA
13{
14  typedef Gnome::Canvas::CanvasAA Parent;
15
16public:
17  GraphDisplayerCanvas(Graph &, CoordinatesMap &, MapStorage &);
18  virtual ~GraphDisplayerCanvas();
19
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);
23
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);
27
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);
31
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();
42
43  ///This function changes the tool in the graph-editor's hand
44  void changeEditorialTool(int);
45
46protected:
47
48  //maximizing, minimizing, restoring window, etc.
49  virtual bool on_expose_event(GdkEventExpose *);
50
51private:
52
53  ///This function is responsible for the correct
54  ///reaction of any action happened in the territory
55  ///of the canvas
56  bool event_handler(GdkEvent* e, Node n);
57
58  ///actual event handler
59  ///
60  ///Actual event handler should be stored, to be able to disconnect it and later reconnect it.
61  sigc::connection actual_handler;
62
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
70  ///The graph, on which we work
71  Graph g;
72
73  ///Map of nodes of graph
74  Graph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;
75
76  ///Map of edges of graph
77  Graph::EdgeMap<Gnome::Canvas::Line *> edgesmap;
78
79  ///Map of texts to write on edges
80  Graph::EdgeMap<Gnome::Canvas::Text *> edgetextmap;
81
82  ///Group of graphical elements of displayed_graph
83  Gnome::Canvas::Group displayed_graph;
84
85  ///Here we store the maps that can be displayed through properties.
86  MapStorage mapstorage;
87
88  ///Indicates whether the button of mouse is pressed or not
89  bool isbutton;
90
91  ///At this location was the mousebutton pressed.
92  ///It helps to calculate the distance of dragging.
93  double clicked_x, clicked_y;
94
95  ///Remembers which Gnome::Canvas::Item was pressed.
96  ///this variable is needed, because
97  ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
98  ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
99  Gnome::Canvas::Item * active_item, * target_item;
100  Graph::NodeIt active_node;
101  Graph::EdgeIt active_edge;
102
103  static const int zoom_step = 5;
104};
105
106#endif //GRAPH_DISPLAYER_CANVAS_H
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