COIN-OR::LEMON - Graph Library

source: lemon-0.x/gui/broken_edge.cc @ 1500:a222eb109e52

Last change on this file since 1500:a222eb109e52 was 1500:a222eb109e52, checked in by Hegyi Péter, 15 years ago

First of all: revision 1981 is mine, what is important me because I was born in 1981. But what is new in my revision? If you drag nodes with left button, edge-breakpoints do not change location. If you drag nodes by right button, they do, they take up their base situation at the halfpoint of the edge.

File size: 4.5 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, bool move)
21{
22  bool set_arrow=false;
23  if(!move)
24    {
25      if(p.size()==2)
26        {
27          set_arrow=true;
28          Gnome::Canvas::Points points_with_center;
29          points_with_center.push_back(my_points[0]=p[0]);
30          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 );
31          points_with_center.push_back(my_points[2]=p[1]);
32          property_points().set_value(points_with_center);
33        } 
34      if(p.size()==3)
35        {
36          set_arrow=true;
37          property_points().set_value(p);
38          for(int i=0;i<3;i++)
39            {
40              my_points[i]=p[i];
41            }
42        }
43    }
44  else
45    {
46      if(p.size()==2)
47        {
48          Gnome::Canvas::Points points;
49          my_points[0]=p[0];
50          my_points[2]=p[1];
51          for(int i=0;i<3;i++)
52            {
53              points.push_back(my_points[i]);
54            }
55          property_points().set_value(points);
56        }
57    }
58
59  if(set_arrow)
60    {
61      //calculating coordinates of the direction indicator arrow
62
63      xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );
64      xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );
65
66      xy<gdouble> unit_vector_in_dir(target-center);
67      //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;
68      unit_vector_in_dir/=sqrt( unit_vector_in_dir.normSquare() );
69      //       std::cout << " = " << unit_vector_in_dir << std::endl;
70
71      xy<gdouble> unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);
72      //       std::cout << unit_norm_vector << std::endl;
73
74      {     
75        //       /\             top
76        //      /  \
77        //      -  -      c(enter)l(eft), ccl, ccr, cr
78        //       ||
79        //       ||       b(ottom)l, br
80      }
81
82      double size=3;
83
84      xy<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );
85      xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );
86      xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );
87      xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );
88      xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );
89      xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );
90      xy<gdouble> top(center + unit_vector_in_dir * 3 * size);
91         
92      //       std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;
93
94      Gnome::Canvas::Points arrow_points;
95      arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );
96      arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );
97      arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );
98      arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );
99      arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );
100      arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );
101      arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );
102
103      arrow->property_points().set_value(arrow_points);
104    }
105}
106
107bool BrokenEdge::edge_former_event_handler(GdkEvent* e)
108{
109  switch(e->type)
110    {
111    case GDK_BUTTON_PRESS:
112      //we mark the location of the event to be able to calculate parameters of dragging
113      clicked_x=e->button.x;
114      clicked_y=e->button.y;
115      isbutton=true;
116      break;
117    case GDK_BUTTON_RELEASE:
118      isbutton=false;
119      break;
120    case GDK_MOTION_NOTIFY:
121      //we only have to do sg. if the mouse button is pressed
122      if(isbutton)
123        {
124          //new coordinates will be the old values,
125          //because the item will be moved to the
126          //new coordinate therefore the new movement
127          //has to be calculated from here
128
129          double dx=e->motion.x-clicked_x;
130          double dy=e->motion.y-clicked_y;
131
132          Gnome::Canvas::Points points_new;
133
134          points_new.push_back(my_points[0]);
135          points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));
136          points_new.push_back(my_points[2]);
137
138          set_points(points_new);
139
140          clicked_x=e->motion.x;
141          clicked_y=e->motion.y;
142
143        }
144    default: break;
145    }
146
147  return true;
148}
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