COIN-OR::LEMON - Graph Library

source: lemon-0.x/gui/broken_edge.cc @ 1508:389a94a1d9eb

Last change on this file since 1508:389a94a1d9eb was 1505:7121597da9ba, checked in by Hegyi Péter, 15 years ago

Previous commit was also mine, but I forgot to say, that it was my younger brother's birthyear. From this commit texts of activated maps move together with red arrows.

File size: 4.9 KB
Line 
1#include <broken_edge.h>
2#include <math.h>
3
4BrokenEdge::BrokenEdge(Gnome::Canvas::Group & g, Gnome::Canvas::Points p, GraphDisplayerCanvas & gc) : Line(g), gdc(gc), isbutton(false)
5{
6  my_points=new Gnome::Art::Point[3];
7
8  arrow=new Gnome::Canvas::Polygon(g);
9  *arrow << Gnome::Canvas::Properties::fill_color("red");
10  arrow->signal_event().connect(sigc::mem_fun(*this, &BrokenEdge::edge_former_event_handler));
11  set_points(p);
12}
13
14BrokenEdge::~BrokenEdge()
15{
16  if(arrow)delete(arrow);
17}
18
19void BrokenEdge::set_points(Gnome::Canvas::Points p, bool move)
20{
21  bool set_arrow=false;
22  if(!move)
23    {
24      if(p.size()==2)
25        {
26          set_arrow=true;
27          Gnome::Canvas::Points points_with_center;
28          points_with_center.push_back(my_points[0]=p[0]);
29          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 );
30          points_with_center.push_back(my_points[2]=p[1]);
31          property_points().set_value(points_with_center);
32        } 
33      if(p.size()==3)
34        {
35          set_arrow=true;
36          property_points().set_value(p);
37          for(int i=0;i<3;i++)
38            {
39              my_points[i]=p[i];
40            }
41        }
42    }
43  else
44    {
45      if(p.size()==2)
46        {
47          Gnome::Canvas::Points points;
48          my_points[0]=p[0];
49          my_points[2]=p[1];
50          for(int i=0;i<3;i++)
51            {
52              points.push_back(my_points[i]);
53            }
54          property_points().set_value(points);
55        }
56    }
57
58  if(set_arrow)
59    {
60      //calculating coordinates of the direction indicator arrow
61
62      xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );
63      xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );
64
65      xy<gdouble> unit_vector_in_dir(target-center);
66      //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;
67      unit_vector_in_dir/=sqrt( unit_vector_in_dir.normSquare() );
68      //       std::cout << " = " << unit_vector_in_dir << std::endl;
69
70      xy<gdouble> unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);
71      //       std::cout << unit_norm_vector << std::endl;
72
73      {     
74        //       /\       // top
75        //      /  \      //
76        //      -  -      // c(enter)l(eft), ccl, ccr, cr
77        //       ||       //
78        //       ||       // b(ottom)l, br
79      }
80
81      double size=3;
82
83      xy<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );
84      xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );
85      xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );
86      xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );
87      xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );
88      xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );
89      xy<gdouble> top(center + unit_vector_in_dir * 3 * size);
90         
91      //       std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;
92
93      Gnome::Canvas::Points arrow_points;
94      arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );
95      arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );
96      arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );
97      arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );
98      arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );
99      arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );
100      arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );
101
102      arrow->property_points().set_value(arrow_points);
103    }
104}
105
106bool BrokenEdge::edge_former_event_handler(GdkEvent* e)
107{
108  switch(e->type)
109    {
110    case GDK_BUTTON_PRESS:
111      //we mark the location of the event to be able to calculate parameters of dragging
112      if(gdc.get_actual_tool()!=CREATE_NODE)
113        {
114          gdc.toggle_edge_activity(this, true);
115          clicked_x=e->button.x;
116          clicked_y=e->button.y;
117          isbutton=true;
118        }
119      break;
120    case GDK_BUTTON_RELEASE:
121      if(gdc.get_actual_tool()!=CREATE_NODE)
122        {
123          gdc.toggle_edge_activity(this, false);
124          isbutton=false;
125        }
126      break;
127    case GDK_MOTION_NOTIFY:
128      //we only have to do sg. if the mouse button is pressed
129      if(isbutton)
130        {
131          //new coordinates will be the old values,
132          //because the item will be moved to the
133          //new coordinate therefore the new movement
134          //has to be calculated from here
135
136          double dx=e->motion.x-clicked_x;
137          double dy=e->motion.y-clicked_y;
138
139          Gnome::Canvas::Points points_new;
140
141          points_new.push_back(my_points[0]);
142          points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));
143          points_new.push_back(my_points[2]);
144
145          set_points(points_new);
146          gdc.text_reposition(xy<double>(my_points[1].get_x(),my_points[1].get_y()));
147
148          clicked_x=e->motion.x;
149          clicked_y=e->motion.y;
150
151        }
152    default: break;
153    }
154
155  return true;
156}
157
158xy<double> BrokenEdge::get_arrow_pos()
159{
160  xy<double> ret_val(my_points[1].get_x(),my_points[1].get_y());
161  return ret_val;
162}
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