COIN-OR::LEMON - Graph Library

source: lemon-0.x/gui/graph_displayer_canvas.h @ 1501:39d59aee2a1a

Last change on this file since 1501:39d59aee2a1a was 1501:39d59aee2a1a, checked in by Hegyi Péter, 15 years ago

Very small bug is corrected: if node creator tool is active, the small red arrows won't move, if you click on them and if you drag the newly created node... 'was hard to notice it :-)

File size: 3.9 KB
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1// -*- C++ -*- //
2
3#ifndef GRAPH_DISPLAYER_CANVAS_H
4#define GRAPH_DISPLAYER_CANVAS_H
5
6class GraphDisplayerCanvas;
7
8#include <all_include.h>
9#include <mapstorage.h>
10#include <broken_edge.h>
11#include <libgnomecanvasmm.h>
12#include <libgnomecanvasmm/polygon.h>
13
14///This class is the canvas, on which the graph can be drawn.
15class GraphDisplayerCanvas : public Gnome::Canvas::CanvasAA
16{
17  typedef Gnome::Canvas::CanvasAA Parent;
18
19public:
20  GraphDisplayerCanvas(Graph &, CoordinatesMap &, MapStorage &);
21  virtual ~GraphDisplayerCanvas();
22
23  ///Changes the linewidth attribute according to the given map.
24  ///\param mapname is the name of the map which contains the new values
25  int changeLineWidth (std::string mapname);
26
27  ///Changes the linecolor attribute according to the given map.
28  ///\param mapname is the name of the map which contains the new values
29  int changeColor (std::string mapname);
30
31  ///Changes the text of line attribute according to the given map.
32  ///\param mapname is the name of the map which contains the new values
33  int changeText (std::string mapname);
34
35  ///Callback for 'ViewZoomIn' action.
36  virtual void zoomIn();
37  ///Callback for 'ViewZoomOut' action.
38  virtual void zoomOut();
39  ///Callback for 'ViewZoomFit' action.
40  virtual void zoomFit();
41  ///Callback for 'ViewZoom100' action.
42  virtual void zoom100();
43  ///Sets the scroll region of the convas to the bounding box of the graph.
44  void updateScrollRegion();
45
46  ///This function changes the tool in the graph-editor's hand
47  void changeEditorialTool(int);
48
49protected:
50
51  //maximizing, minimizing, restoring window, etc.
52  virtual bool on_expose_event(GdkEventExpose *);
53
54private:
55
56  ///This function is responsible for the correct
57  ///reaction of any action happened in the territory
58  ///of the canvas
59  bool event_handler(GdkEvent* e, Node n);
60
61  ///actual event handler
62  ///
63  ///Actual event handler should be stored, to be able to disconnect it and later reconnect it.
64  sigc::connection actual_handler;
65
66  ///event handler for the case when move-tool is active
67  bool move_event_handler(GdkEvent*);
68  ///event handler for the case when create_node-tool is active
69  bool create_node_event_handler(GdkEvent*);
70  ///event handler for the case when create_edge-tool is active
71  bool create_edge_event_handler(GdkEvent*);
72  ///event handler for the case when eraser-tool is active
73  bool eraser_event_handler(GdkEvent*);
74  ///event handler for the case when eraser-tool is active
75  bool edge_map_edit_event_handler(GdkEvent*);
76
77public:
78  ///\return the actual tool in hand
79  int get_actual_tool();
80
81private:
82  ///Deletes the given element.
83  void delete_item(NodeIt);
84  ///Deletes the given element.
85  void delete_item(EdgeIt);
86  ///Deletes the given element.
87  void delete_item(Graph::Edge);
88
89private:
90
91  ///The graph, on which we work
92  Graph g;
93
94  ///Map of nodes of graph
95  Graph::NodeMap<Gnome::Canvas::Ellipse *> nodesmap;
96
97  ///Map of edges of graph
98  Graph::EdgeMap<BrokenEdge *> edgesmap;
99
100  ///Map of texts to write on edges
101  Graph::EdgeMap<Gnome::Canvas::Text *> edgetextmap;
102
103  ///Group of graphical elements of displayed_graph
104  Gnome::Canvas::Group displayed_graph;
105
106  ///Here we store the maps that can be displayed through properties.
107  MapStorage mapstorage;
108
109  ///Indicates whether the button of mouse is pressed or not
110  int isbutton;
111
112  ///Stores the actual tool in hand
113  int actual_tool;
114
115  ///At this location was the mousebutton pressed.
116  ///It helps to calculate the distance of dragging.
117  double clicked_x, clicked_y;
118
119  ///Remembers which Gnome::Canvas::Item was pressed.
120  ///this variable is needed, because
121  ///1. we cannot query the item at he cursor as fast as it could not cause a Segmentation Fault
122  ///2. we would like to handle only ony item per movement, therefore quering it is not a working solution
123  Gnome::Canvas::Item * active_item, * target_item;
124  Graph::NodeIt active_node;
125  Graph::EdgeIt active_edge;
126
127  static const int zoom_step = 5;
128
129};
130
131#endif //GRAPH_DISPLAYER_CANVAS_H
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