COIN-OR::LEMON - Graph Library

source: glemon-0.x/broken_edge.cc @ 19:164783ceb9be

gui
Last change on this file since 19:164783ceb9be was 19:164783ceb9be, checked in by Hegyi Péter, 14 years ago

Little red arrows appear in breakpoints of edges.

File size: 4.2 KB
Line 
1#include <broken_edge.h>
2#include <lemon/xy.h>
3#include <math.h>
4
5BrokenEdge::BrokenEdge(Gnome::Canvas::Group & g, Gnome::Canvas::Points p) : Line(g), isbutton(false)
6{
7  my_points=new Gnome::Art::Point[3];
8
9  arrow=new Gnome::Canvas::Polygon(g);
10  *arrow << Gnome::Canvas::Properties::fill_color("red");
11  arrow->signal_event().connect(sigc::mem_fun(*this, &BrokenEdge::edge_former_event_handler));
12  set_points(p);
13}
14
15BrokenEdge::~BrokenEdge()
16{
17  if(arrow)delete(arrow);
18}
19
20void BrokenEdge::set_points(Gnome::Canvas::Points p)
21{
22  bool set_arrow=false;
23  if(p.size()==2)
24    {
25      set_arrow=true;
26      Gnome::Canvas::Points points_with_center;
27      points_with_center.push_back(my_points[0]=p[0]);
28      points_with_center.push_back(my_points[1]=Gnome::Art::Point( (p[0].get_x()+p[1].get_x())/2+0 , (p[0].get_y()+p[1].get_y())/2 )+0 );
29      points_with_center.push_back(my_points[2]=p[1]);
30      property_points().set_value(points_with_center);
31    } 
32  if(p.size()==3)
33    {
34      set_arrow=true;
35      property_points().set_value(p);
36      for(int i=0;i<3;i++)
37        {
38          my_points[i]=p[i];
39        }
40    }
41
42  if(set_arrow)
43    {
44      //calculating coordinates of the direction indicator arrow
45
46      xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );
47      xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );
48
49      xy<gdouble> unit_vector_in_dir(target-center);
50      //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;
51      unit_vector_in_dir/=sqrt( unit_vector_in_dir.normSquare() );
52      //       std::cout << " = " << unit_vector_in_dir << std::endl;
53
54      xy<gdouble> unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);
55      //       std::cout << unit_norm_vector << std::endl;
56
57      {     
58        //       /\             top
59        //      /  \
60        //      -  -      c(enter)l(eft), ccl, ccr, cr
61        //       ||
62        //       ||       b(ottom)l, br
63      }
64
65      double size=3;
66
67      xy<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );
68      xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );
69      xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );
70      xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );
71      xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );
72      xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );
73      xy<gdouble> top(center + unit_vector_in_dir * 3 * size);
74         
75      //       std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;
76
77      Gnome::Canvas::Points arrow_points;
78      arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );
79      arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );
80      arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );
81      arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );
82      arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );
83      arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );
84      arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );
85
86      arrow->property_points().set_value(arrow_points);
87    }
88}
89
90bool BrokenEdge::edge_former_event_handler(GdkEvent* e)
91{
92  switch(e->type)
93    {
94    case GDK_BUTTON_PRESS:
95      //we mark the location of the event to be able to calculate parameters of dragging
96      clicked_x=e->button.x;
97      clicked_y=e->button.y;
98      isbutton=true;
99      break;
100    case GDK_BUTTON_RELEASE:
101      isbutton=false;
102      break;
103    case GDK_MOTION_NOTIFY:
104      //we only have to do sg. if the mouse button is pressed
105      if(isbutton)
106        {
107          //new coordinates will be the old values,
108          //because the item will be moved to the
109          //new coordinate therefore the new movement
110          //has to be calculated from here
111
112          double dx=e->motion.x-clicked_x;
113          double dy=e->motion.y-clicked_y;
114
115          Gnome::Canvas::Points points_new;
116
117          points_new.push_back(my_points[0]);
118          points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));
119          points_new.push_back(my_points[2]);
120
121          set_points(points_new);
122
123          clicked_x=e->motion.x;
124          clicked_y=e->motion.y;
125
126        }
127    default: break;
128    }
129
130  return true;
131}
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