gui/gdc-broken_edge.cc
author deba
Sat, 03 Dec 2005 18:30:31 +0000
changeset 1846 6b4e38acef1c
parent 1819 fd82adfbe905
child 1860 27a9a75b957b
permissions -rw-r--r--
I have forgot the attributes
     1 #include "graph_displayer_canvas.h"
     2 #include <cmath>
     3 
     4 GraphDisplayerCanvas::BrokenEdge::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, &GraphDisplayerCanvas::BrokenEdge::edgeFormerEventHandler));
    11   arrow->lower_to_bottom();
    12   setPoints(p);
    13 }
    14 
    15 GraphDisplayerCanvas::BrokenEdge::~BrokenEdge()
    16 {
    17   if(arrow)delete(arrow);
    18 }
    19 
    20 void GraphDisplayerCanvas::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 	  if((absa!=0)&&(absb!=0))
    77 	    {
    78 	      //old vector from one node to the breakpoint - c
    79 	      xy<double> c_v(my_points[1].get_x()-my_points[0].get_x(),my_points[1].get_y()-my_points[0].get_y());
    80 
    81 	      //unit vector with the same direction to a_v
    82 	      xy<double> a_v_u(a_v.x/absa,a_v.y/absa);
    83 
    84 	      //normal vector of unit vector with the same direction to a_v
    85 	      xy<double> a_v_u_n(((-1)*a_v_u.y),a_v_u.x);
    86 
    87 	      //unit vector with the same direction to b_v
    88 	      xy<double> b_v_u(b_v.x/absb,b_v.y/absb);
    89 
    90 	      //normal vector of unit vector with the same direction to b_v
    91 	      xy<double> b_v_u_n(((-1)*b_v_u.y),b_v_u.x);
    92 
    93 	      //vector c in a_v_u and a_v_u_n co-ordinate system
    94 	      xy<double> c_a(c_v*a_v_u,c_v*a_v_u_n);
    95 
    96 	      //new vector from one node to the breakpoint - d - we have to calculate this one
    97 	      xy<double> d_v=absb/absa*(c_a.x*b_v_u+c_a.y*b_v_u_n);
    98 
    99 	      my_points[1]=Gnome::Art::Point(d_v.x+p[0].get_x(),d_v.y+p[0].get_y());
   100 
   101 	      my_points[0]=p[0];
   102 	      my_points[2]=p[1];
   103 	  
   104 	      Gnome::Canvas::Points points;
   105 	      for(int i=0;i<3;i++)
   106 		{
   107 		  points.push_back(my_points[i]);
   108 		}
   109 	      property_points().set_value(points);
   110 	    }
   111 	  else
   112 	    {
   113 	      //if distance is 0, segmentation would be occured
   114 	      //in calculations, because of division by zero
   115 	      //But we have luck: the edge cannot be seen in
   116 	      //this case, so no update needed
   117 	      set_arrow=false;
   118 	    }
   119 	}
   120     }
   121   if(set_arrow)
   122     {
   123       //calculating coordinates of the direction indicator arrow
   124 
   125       xy<gdouble> target( my_points[2].get_x(), my_points[2].get_y() );
   126       xy<gdouble> center( my_points[1].get_x(), my_points[1].get_y() );
   127 
   128       xy<gdouble> unit_vector_in_dir(target-center);
   129       double length=sqrt( unit_vector_in_dir.normSquare() );
   130 
   131       //       std::cout << target << " - " << center << " = " << unit_vector_in_dir << "    / " <<unit_vector_in_dir.normSquare() ;
   132       unit_vector_in_dir/=length;
   133       //       std::cout << " = " << unit_vector_in_dir << std::endl;
   134 
   135       xy<gdouble> unit_norm_vector(0-unit_vector_in_dir.y, unit_vector_in_dir.x);
   136       //       std::cout << unit_norm_vector << std::endl;
   137 
   138       {      
   139 	//       /\       // top
   140 	//      /  \      //
   141 	//      -  -      // c(enter)l(eft), ccl, ccr, cr
   142 	//       ||       //
   143 	//       ||       // b(ottom)l, br
   144       }
   145 
   146       double size=3;
   147 
   148       xy<gdouble> bl (center - unit_vector_in_dir * 3 * size + unit_norm_vector * size );
   149       xy<gdouble> br (center - unit_vector_in_dir * 3 * size - unit_norm_vector * size );
   150       xy<gdouble> ccl(center + unit_vector_in_dir *  size + unit_norm_vector * size );
   151       xy<gdouble> ccr(center + unit_vector_in_dir *  size - unit_norm_vector * size );
   152       xy<gdouble> cl (center + unit_vector_in_dir *  size + unit_norm_vector * 2 * size );
   153       xy<gdouble> cr (center + unit_vector_in_dir *  size - unit_norm_vector * 2 * size );
   154       xy<gdouble> top(center + unit_vector_in_dir * 3 * size);
   155 	 
   156       //std::cout << bl << " " << br << " " << ccl << " "  << ccr << " " << cl << " " << cr << " " << top << std::endl;
   157 
   158       Gnome::Canvas::Points arrow_points;
   159       arrow_points.push_back(Gnome::Art::Point( bl.x , bl.y  ) );
   160       arrow_points.push_back(Gnome::Art::Point( br.x , br.y  ) );
   161       arrow_points.push_back(Gnome::Art::Point( ccr.x, ccr.y ) );
   162       arrow_points.push_back(Gnome::Art::Point( cr.x , cr.y  ) );
   163       arrow_points.push_back(Gnome::Art::Point( top.x, top.y ) );
   164       arrow_points.push_back(Gnome::Art::Point( cl.x , cl.y  ) );
   165       arrow_points.push_back(Gnome::Art::Point( ccl.x, ccl.y ) );
   166 
   167       arrow->property_points().set_value(arrow_points);
   168     }
   169 }
   170 
   171 bool GraphDisplayerCanvas::BrokenEdge::edgeFormerEventHandler(GdkEvent* e)
   172 {
   173   switch(e->type)
   174     {
   175     case GDK_BUTTON_PRESS:
   176       //we mark the location of the event to be able to calculate parameters of dragging
   177       if(gdc.getActualTool()!=CREATE_NODE)
   178 	{
   179 	  gdc.toggleEdgeActivity(this, true);
   180 	  clicked_x=e->button.x;
   181 	  clicked_y=e->button.y;
   182 	  isbutton=true;
   183 	}
   184       break;
   185     case GDK_BUTTON_RELEASE:
   186       if(gdc.getActualTool()!=CREATE_NODE)
   187 	{
   188 	  gdc.toggleEdgeActivity(this, false);
   189 	  isbutton=false;
   190 	}
   191       break;
   192     case GDK_MOTION_NOTIFY:
   193       //we only have to do sg. if the mouse button is pressed
   194       if(isbutton)
   195 	{
   196 	  //new coordinates will be the old values,
   197 	  //because the item will be moved to the
   198 	  //new coordinate therefore the new movement
   199 	  //has to be calculated from here
   200 
   201 	  double dx=e->motion.x-clicked_x;
   202 	  double dy=e->motion.y-clicked_y;
   203 
   204 	  Gnome::Canvas::Points points_new;
   205 
   206 	  points_new.push_back(my_points[0]);
   207 	  points_new.push_back(my_points[1]=Gnome::Art::Point(my_points[1].get_x()+dx,my_points[1].get_y()+dy));
   208 	  points_new.push_back(my_points[2]);
   209 
   210 	  setPoints(points_new);
   211 	  gdc.textReposition(xy<double>(my_points[1].get_x(),my_points[1].get_y()));
   212 
   213 	  clicked_x=e->motion.x;
   214 	  clicked_y=e->motion.y;
   215 
   216 	}
   217     default: break;
   218     }
   219 
   220   return true;
   221 }
   222 
   223 xy<double> GraphDisplayerCanvas::BrokenEdge::getArrowPos()
   224 {
   225   xy<double> ret_val(my_points[1].get_x(),my_points[1].get_y());
   226   return ret_val;
   227 }