COIN-OR::LEMON - Graph Library

source: glemon-0.x/broken_edge.cc @ 80:231191361de5

gui
Last change on this file since 80:231191361de5 was 80:231191361de5, checked in by Hegyi Péter, 14 years ago

Shape keeping movement is implemented, at last. Many thanks to Alpar.

File size: 6.8 KB
Line 
1#include "broken_edge.h"
2#include <cmath>
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::edgeFormerEventHandler));
11  arrow->lower_to_bottom();
12  setPoints(p);
13}
14
15BrokenEdge::~BrokenEdge()
16{
17  if(arrow)delete(arrow);
18}
19
20void BrokenEdge::setPoints(Gnome::Canvas::Points p, bool move)
21{
22  bool set_arrow=false;
23  //red arrow losts its position-right button
24  if(!move)
25    {
26      if(p.size()==2)
27        {
28          set_arrow=true;
29          Gnome::Canvas::Points points_with_center;
30          points_with_center.push_back(my_points[0]=p[0]);
31          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 );
32          points_with_center.push_back(my_points[2]=p[1]);
33          property_points().set_value(points_with_center);
34        } 
35      if(p.size()==3)
36        {
37          set_arrow=true;
38          property_points().set_value(p);
39          for(int i=0;i<3;i++)
40            {
41              my_points[i]=p[i];
42            }
43        }
44    }
45  else
46    {
47      //arrow keeps its position-left button
48
49//       if(p.size()==2)
50//              {
51//                Gnome::Canvas::Points points;
52//                my_points[0]=p[0];
53//                my_points[2]=p[1];
54//                for(int i=0;i<3;i++)
55//                  {
56//                    points.push_back(my_points[i]);
57//                  }
58//                property_points().set_value(points);
59//              }
60      set_arrow=true;
61
62      //////////////////////////////////////////////////////////////////////////////////////////////////////
63      /////////// keeps shape-with scalar multiplication - version 2.
64      //////////////////////////////////////////////////////////////////////////////////////////////////////
65
66      if(p.size()==2)
67        {
68          //old vector from one to the other node - a
69          xy<double> a_v(my_points[2].get_x()-my_points[0].get_x(),my_points[2].get_y()-my_points[0].get_y());
70          //new vector from one to the other node - b
71          xy<double> b_v(p[1].get_x()-p[0].get_x(),p[1].get_y()-p[0].get_y());
72
73          double absa=sqrt(a_v.normSquare());
74          double absb=sqrt(b_v.normSquare());
75
76          //old vector from one node to the breakpoint - c
77          xy<double> c_v(my_points[1].get_x()-my_points[0].get_x(),my_points[1].get_y()-my_points[0].get_y());
78
79          //unit vector with the same direction to a_v
80          xy<double> a_v_u(a_v.x/absa,a_v.y/absa);
81
82          //normal vector of unit vector with the same direction to a_v
83          xy<double> a_v_u_n(((-1)*a_v_u.y),a_v_u.x);
84
85          //unit vector with the same direction to b_v
86          xy<double> b_v_u(b_v.x/absb,b_v.y/absb);
87
88          //normal vector of unit vector with the same direction to b_v
89          xy<double> b_v_u_n(((-1)*b_v_u.y),b_v_u.x);
90
91          //vector c in a_v_u and a_v_u_n co-ordinate system
92          xy<double> c_a(c_v*a_v_u,c_v*a_v_u_n);
93
94          //new vector from one node to the breakpoint - d - we have to calculate this one
95          xy<double> d_v=absb/absa*(c_a.x*b_v_u+c_a.y*b_v_u_n);
96
97          my_points[1]=Gnome::Art::Point(d_v.x+p[0].get_x(),d_v.y+p[0].get_y());
98
99          my_points[0]=p[0];
100          my_points[2]=p[1];
101
102          Gnome::Canvas::Points points;
103          for(int i=0;i<3;i++)
104            {
105              points.push_back(my_points[i]);
106            }
107          property_points().set_value(points);
108        }
109    }
110  if(set_arrow)
111    {
112      //calculating coordinates of the direction indicator arrow
113
114      xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );
115      xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );
116
117      xy<gdouble> unit_vector_in_dir(target-center);
118      //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;
119      unit_vector_in_dir/=sqrt( unit_vector_in_dir.normSquare() );
120      //       std::cout << " = " << unit_vector_in_dir << std::endl;
121
122      xy<gdouble> unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);
123      //       std::cout << unit_norm_vector << std::endl;
124
125      {     
126        //       /\       // top
127        //      /  \      //
128        //      -  -      // c(enter)l(eft), ccl, ccr, cr
129        //       ||       //
130        //       ||       // b(ottom)l, br
131      }
132
133      double size=3;
134
135      xy<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );
136      xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );
137      xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );
138      xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );
139      xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );
140      xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );
141      xy<gdouble> top(center + unit_vector_in_dir * 3 * size);
142         
143      //       std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;
144
145      Gnome::Canvas::Points arrow_points;
146      arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );
147      arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );
148      arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );
149      arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );
150      arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );
151      arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );
152      arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );
153
154      arrow->property_points().set_value(arrow_points);
155    }
156}
157
158bool BrokenEdge::edgeFormerEventHandler(GdkEvent* e)
159{
160  switch(e->type)
161    {
162    case GDK_BUTTON_PRESS:
163      //we mark the location of the event to be able to calculate parameters of dragging
164      if(gdc.getActualTool()!=CREATE_NODE)
165        {
166          gdc.toggleEdgeActivity(this, true);
167          clicked_x=e->button.x;
168          clicked_y=e->button.y;
169          isbutton=true;
170        }
171      break;
172    case GDK_BUTTON_RELEASE:
173      if(gdc.getActualTool()!=CREATE_NODE)
174        {
175          gdc.toggleEdgeActivity(this, false);
176          isbutton=false;
177        }
178      break;
179    case GDK_MOTION_NOTIFY:
180      //we only have to do sg. if the mouse button is pressed
181      if(isbutton)
182        {
183          //new coordinates will be the old values,
184          //because the item will be moved to the
185          //new coordinate therefore the new movement
186          //has to be calculated from here
187
188          double dx=e->motion.x-clicked_x;
189          double dy=e->motion.y-clicked_y;
190
191          Gnome::Canvas::Points points_new;
192
193          points_new.push_back(my_points[0]);
194          points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));
195          points_new.push_back(my_points[2]);
196
197          setPoints(points_new);
198          gdc.textReposition(xy<double>(my_points[1].get_x(),my_points[1].get_y()));
199
200          clicked_x=e->motion.x;
201          clicked_y=e->motion.y;
202
203        }
204    default: break;
205    }
206
207  return true;
208}
209
210xy<double> BrokenEdge::getArrowPos()
211{
212  xy<double> ret_val(my_points[1].get_x(),my_points[1].get_y());
213  return ret_val;
214}
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