graph_displayer_canvas-event.cc
author hegyi
Mon, 25 Sep 2006 15:30:04 +0000
changeset 154 65c1b103443d
parent 151 72f1c33f89d4
child 160 14a76109b561
permissions -rwxr-xr-x
Node view
     1 #include "graph_displayer_canvas.h"
     2 #include <cmath>
     3 
     4 
     5 bool GraphDisplayerCanvas::on_expose_event(GdkEventExpose *event)
     6 {
     7   Gnome::Canvas::CanvasAA::on_expose_event(event);
     8   //usleep(10000);
     9   //rezoom();
    10   return true;
    11 }
    12 
    13 void GraphDisplayerCanvas::changeEditorialTool(int newtool)
    14 {
    15   if(actual_tool!=newtool)
    16     {
    17 
    18       actual_handler.disconnect();
    19 
    20       switch(actual_tool)
    21 	{
    22 	case CREATE_EDGE:
    23 	  {
    24 	    GdkEvent * generated=new GdkEvent();
    25 	    generated->type=GDK_BUTTON_RELEASE;
    26 	    generated->button.button=3;
    27 	    createEdgeEventHandler(generated);      
    28 	    break;
    29 	  }
    30 	case MAP_EDIT:
    31 	  {
    32 	    break;
    33 	  }
    34 	default:
    35 	  break;
    36 	}
    37 
    38       active_item=NULL; 
    39       target_item=NULL; 
    40       active_edge=INVALID;	
    41       active_node=INVALID;	
    42 
    43 
    44       actual_tool=newtool;
    45   
    46       switch(newtool)
    47 	{
    48 	case MOVE:
    49 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::moveEventHandler), false);
    50 	  break;
    51 
    52 	case CREATE_NODE:
    53 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::createNodeEventHandler), false);
    54 	  break;
    55 
    56 	case CREATE_EDGE:
    57 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::createEdgeEventHandler), false);
    58 	  break;
    59 
    60 	case ERASER:
    61 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::eraserEventHandler), false);
    62 	  break;
    63 
    64 	case MAP_EDIT:
    65 	  grab_focus();
    66 	  actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::mapEditEventHandler), false);
    67 	  break;
    68 
    69 	default:
    70 	  break;
    71 	}
    72     }
    73 }
    74 
    75 int GraphDisplayerCanvas::getActualTool()
    76 {
    77   return actual_tool;
    78 }
    79 
    80 bool GraphDisplayerCanvas::moveEventHandler(GdkEvent* e)
    81 {
    82   static Gnome::Canvas::Text *coord_text = 0;
    83   switch(e->type)
    84   {
    85     case GDK_BUTTON_PRESS:
    86       //we mark the location of the event to be able to calculate parameters of dragging
    87       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
    88 
    89       active_item=(get_item_at(clicked_x, clicked_y));
    90       active_node=INVALID;
    91       for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
    92 	{
    93 	  if(nodesmap[i]==active_item)
    94 	    {
    95 	      active_node=i;
    96 	    }
    97 	}
    98       isbutton=e->button.button;
    99       break;
   100     case GDK_BUTTON_RELEASE:
   101       if (coord_text)
   102       {
   103         delete coord_text;
   104         coord_text = 0;
   105       }
   106       isbutton=0;
   107       active_item=NULL;
   108       active_node=INVALID;
   109       break;
   110     case GDK_MOTION_NOTIFY:
   111       //we only have to do sg. if the mouse button is pressed AND the click was on a node that was found in the set of nodes
   112       if(active_node!=INVALID)
   113       {
   114         (mytab.mapstorage).modified = true;
   115 
   116 	//new coordinates will be the old values,
   117 	//because the item will be moved to the
   118 	//new coordinate therefore the new movement
   119 	//has to be calculated from here
   120 
   121 	double new_x, new_y;
   122 
   123 	window_to_world (e->motion.x, e->motion.y, new_x, new_y);
   124 
   125         double dx=new_x-clicked_x;
   126         double dy=new_y-clicked_y;
   127 
   128 	//repositioning node and its text
   129         active_item->move(dx, dy);
   130 	nodetextmap[active_node]->move(dx, dy);
   131 
   132         // the new coordinates of the centre of the node 
   133         double coord_x = new_x - (clicked_x - (mytab.mapstorage).coords[active_node].x);
   134         double coord_y = new_y - (clicked_y - (mytab.mapstorage).coords[active_node].y);
   135 
   136         // write back the new coordinates to the coords map
   137         (mytab.mapstorage).coords.set(active_node, XY(coord_x, coord_y));
   138 
   139         clicked_x=new_x;
   140         clicked_y=new_y;
   141 
   142         // reposition the coordinates text
   143         std::ostringstream ostr;
   144         ostr << "(" <<
   145           (mytab.mapstorage).coords[active_node].x << ", " <<
   146           (mytab.mapstorage).coords[active_node].y << ")";
   147         double radius =
   148           (nodesmap[active_node]->property_x2().get_value() -
   149           nodesmap[active_node]->property_x1().get_value()) / 2.0;
   150         if (coord_text)
   151         {
   152           coord_text->property_text().set_value(ostr.str());
   153           coord_text->property_x().set_value((mytab.mapstorage).coords[active_node].x +
   154               radius);
   155           coord_text->property_y().set_value((mytab.mapstorage).coords[active_node].y -
   156               radius);
   157         }
   158         else
   159         {
   160           coord_text = new Gnome::Canvas::Text(
   161               displayed_graph,
   162               (mytab.mapstorage).coords[active_node].x + radius,
   163               (mytab.mapstorage).coords[active_node].y - radius,
   164               ostr.str());
   165           coord_text->property_fill_color().set_value("black");
   166           coord_text->property_anchor().set_value(Gtk::ANCHOR_SOUTH_WEST);
   167         }
   168 
   169 	//all the edges connected to the moved point has to be redrawn
   170         for(OutEdgeIt ei((mytab.mapstorage).graph,active_node);ei!=INVALID;++ei)
   171         {
   172           XY arrow_pos;
   173 
   174           if (mytab.mapstorage.graph.source(ei) == mytab.mapstorage.graph.target(ei))
   175           {
   176             arrow_pos = mytab.mapstorage.arrow_pos[ei] + XY(dx, dy);
   177           }
   178           else
   179           {
   180             XY moved_node_1(coord_x - dx, coord_y - dy);
   181             XY moved_node_2(coord_x, coord_y);
   182             Node target = mytab.mapstorage.graph.target(ei);
   183             XY fix_node(mytab.mapstorage.coords[target].x,
   184                 mytab.mapstorage.coords[target].y);
   185             XY old_arrow_pos(mytab.mapstorage.arrow_pos[ei]);
   186 
   187             arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, isbutton);
   188           }
   189 
   190           mytab.mapstorage.arrow_pos.set(ei, arrow_pos);
   191           edgesmap[ei]->draw();
   192 
   193           //reposition of edgetext
   194           XY text_pos=mytab.mapstorage.arrow_pos[ei];
   195           text_pos+=(XY(10,10));
   196           edgetextmap[ei]->property_x().set_value(text_pos.x);
   197           edgetextmap[ei]->property_y().set_value(text_pos.y);
   198         }
   199 
   200         for(InEdgeIt ei((mytab.mapstorage).graph,active_node);ei!=INVALID;++ei)
   201         {
   202           if (mytab.mapstorage.graph.source(ei) != mytab.mapstorage.graph.target(ei))
   203           {
   204             XY moved_node_1(coord_x - dx, coord_y - dy);
   205             XY moved_node_2(coord_x, coord_y);
   206             Node source = mytab.mapstorage.graph.source(ei);
   207             XY fix_node(mytab.mapstorage.coords[source].x,
   208                 mytab.mapstorage.coords[source].y);
   209             XY old_arrow_pos(mytab.mapstorage.arrow_pos[ei]);
   210 
   211             XY arrow_pos;
   212             arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, isbutton);
   213 
   214             mytab.mapstorage.arrow_pos.set(ei, arrow_pos);
   215             edgesmap[ei]->draw();
   216 
   217             //reposition of edgetext
   218             XY text_pos=mytab.mapstorage.arrow_pos[ei];
   219             text_pos+=(XY(10,10));
   220             edgetextmap[ei]->property_x().set_value(text_pos.x);
   221             edgetextmap[ei]->property_y().set_value(text_pos.y);
   222           }
   223         }
   224       }
   225     default: break;
   226   }
   227 
   228   return false;
   229 }
   230 
   231 XY GraphDisplayerCanvas::calcArrowPos(XY moved_node_1, XY moved_node_2, XY fix_node, XY old_arrow_pos, int move_code)
   232 {
   233   switch(move_code)
   234     {
   235     case 1:
   236       return XY((moved_node_2.x + fix_node.x) / 2.0, (moved_node_2.y + fix_node.y) / 2.0);
   237       break;
   238     case 2:
   239       return old_arrow_pos;
   240       break;
   241     case 3:
   242       {
   243 	//////////////////////////////////////////////////////////////////////////////////////////////////////
   244 	/////////// keeps shape-with scalar multiplication - version 2.
   245 	//////////////////////////////////////////////////////////////////////////////////////////////////////
   246 
   247 	//old vector from one to the other node - a
   248 	XY a_v(moved_node_1.x-fix_node.x,moved_node_1.y-fix_node.y);
   249 	//new vector from one to the other node - b
   250 	XY b_v(moved_node_2.x-fix_node.x,moved_node_2.y-fix_node.y);
   251 
   252 	double absa=sqrt(a_v.normSquare());
   253 	double absb=sqrt(b_v.normSquare());
   254 
   255 	if ((absa == 0.0) || (absb == 0.0))
   256 	  {
   257 	    return old_arrow_pos;
   258 	  }
   259 	else
   260 	  {
   261 	    //old vector from one node to the breakpoint - c
   262 	    XY c_v(old_arrow_pos.x-fix_node.x,old_arrow_pos.y-fix_node.y);
   263 
   264 	    //unit vector with the same direction to a_v
   265 	    XY a_v_u(a_v.x/absa,a_v.y/absa);
   266 
   267 	    //normal vector of unit vector with the same direction to a_v
   268 	    XY a_v_u_n(((-1)*a_v_u.y),a_v_u.x);
   269 
   270 	    //unit vector with the same direction to b_v
   271 	    XY b_v_u(b_v.x/absb,b_v.y/absb);
   272 
   273 	    //normal vector of unit vector with the same direction to b_v
   274 	    XY b_v_u_n(((-1)*b_v_u.y),b_v_u.x);
   275 
   276 	    //vector c in a_v_u and a_v_u_n co-ordinate system
   277 	    XY c_a(c_v*a_v_u,c_v*a_v_u_n);
   278 
   279 	    //new vector from one node to the breakpoint - d - we have to calculate this one
   280 	    XY d_v=absb/absa*(c_a.x*b_v_u+c_a.y*b_v_u_n);
   281 
   282 	    return XY(d_v.x+fix_node.x,d_v.y+fix_node.y);
   283 	  }
   284 	break;
   285       }
   286     default:
   287       break;
   288     }
   289 }
   290 
   291 
   292 bool GraphDisplayerCanvas::createNodeEventHandler(GdkEvent* e)
   293 {
   294   switch(e->type)
   295   {
   296     //move the new node
   297     case GDK_MOTION_NOTIFY:
   298       {
   299         GdkEvent * generated=new GdkEvent();
   300         generated->motion.x=e->motion.x;
   301         generated->motion.y=e->motion.y;
   302         generated->type=GDK_MOTION_NOTIFY;
   303         moveEventHandler(generated);      
   304         break;
   305       }
   306 
   307     case GDK_BUTTON_RELEASE:
   308       (mytab.mapstorage).modified = true;
   309 
   310       isbutton=1;
   311 
   312       active_node=(mytab.mapstorage).graph.addNode();
   313 
   314       //initiating values corresponding to new node in maps
   315 
   316       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
   317 
   318       // update coordinates
   319       (mytab.mapstorage).coords.set(active_node, XY(clicked_x, clicked_y));
   320 
   321       // update all other maps
   322       for (std::map<std::string, Graph::NodeMap<double>*>::const_iterator it =
   323           (mytab.mapstorage).nodemap_storage.begin(); it !=
   324           (mytab.mapstorage).nodemap_storage.end(); ++it)
   325       {
   326         if ((it->first != "coordinates_x") &&
   327             (it->first != "coordinates_y"))
   328         {
   329           (*(it->second))[active_node] =
   330             (mytab.mapstorage).nodemap_default[it->first];
   331         }
   332       }
   333       // increment the id map's default value
   334       (mytab.mapstorage).nodemap_default["label"] += 1.0;
   335 
   336       nodesmap[active_node]=new Gnome::Canvas::Ellipse(displayed_graph,
   337           clicked_x-20, clicked_y-20, clicked_x+20, clicked_y+20);
   338       active_item=(Gnome::Canvas::Item *)(nodesmap[active_node]);
   339       *(nodesmap[active_node]) <<
   340         Gnome::Canvas::Properties::fill_color("blue");
   341       *(nodesmap[active_node]) <<
   342         Gnome::Canvas::Properties::outline_color("black");
   343       active_item->raise_to_top();
   344 
   345       (nodesmap[active_node])->show();
   346 
   347       nodetextmap[active_node]=new Gnome::Canvas::Text(displayed_graph,
   348           clicked_x+node_property_defaults[N_RADIUS]+5,
   349           clicked_y+node_property_defaults[N_RADIUS]+5, "");
   350       nodetextmap[active_node]->property_fill_color().set_value("darkblue");
   351       nodetextmap[active_node]->raise_to_top();
   352 
   353 //       mapwin.updateNode(active_node);
   354       propertyUpdate(active_node);
   355 
   356       isbutton=0;
   357       target_item=NULL;
   358       active_item=NULL;
   359       active_node=INVALID;
   360       break;
   361     default:
   362       break;
   363   }
   364   return false;
   365 }
   366 
   367 bool GraphDisplayerCanvas::createEdgeEventHandler(GdkEvent* e)
   368 {
   369   switch(e->type)
   370   {
   371     case GDK_BUTTON_PRESS:
   372       //in edge creation right button has special meaning
   373       if(e->button.button!=3)
   374       {
   375         //there is not yet selected node
   376         if(active_node==INVALID)
   377         {
   378           //we mark the location of the event to be able to calculate parameters of dragging
   379 
   380           window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
   381 
   382           active_item=(get_item_at(clicked_x, clicked_y));
   383           active_node=INVALID;
   384           for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   385           {
   386             if(nodesmap[i]==active_item)
   387             {
   388               active_node=i;
   389             }
   390           }
   391           //the clicked item is really a node
   392           if(active_node!=INVALID)
   393           {
   394             *(nodesmap[active_node]) << Gnome::Canvas::Properties::fill_color("red");
   395             isbutton=1;
   396           }
   397           //clicked item was not a node. It could be e.g. edge.
   398           else
   399           {
   400             active_item=NULL;
   401           }
   402         }
   403         //we only have to do sg. if the mouse button
   404         // is pressed already once AND the click was
   405         // on a node that was found in the set of 
   406         //nodes, and now we only search for the second 
   407         //node
   408         else
   409         {
   410           window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
   411           target_item=(get_item_at(clicked_x, clicked_y));
   412           Node target_node=INVALID;
   413           for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   414           {
   415             if(nodesmap[i]==target_item)
   416             {
   417               target_node=i;
   418             }
   419           }
   420           //the clicked item is a node, the edge can be drawn
   421           if(target_node!=INVALID)
   422           {
   423             (mytab.mapstorage).modified = true;
   424 
   425             *(nodesmap[target_node]) <<
   426               Gnome::Canvas::Properties::fill_color("red");
   427 
   428             //creating new edge
   429             active_edge=(mytab.mapstorage).graph.addEdge(active_node,
   430                 target_node);
   431 
   432             // update maps
   433             for (std::map<std::string,
   434                 Graph::EdgeMap<double>*>::const_iterator it =
   435                 (mytab.mapstorage).edgemap_storage.begin(); it !=
   436                 (mytab.mapstorage).edgemap_storage.end(); ++it)
   437             {
   438               (*(it->second))[active_edge] =
   439                 (mytab.mapstorage).edgemap_default[it->first];
   440             }
   441             // increment the id map's default value
   442             (mytab.mapstorage).edgemap_default["label"] += 1.0;
   443 
   444             if(target_node!=active_node)		
   445             {
   446               // set the coordinates of the arrow on the new edge
   447               MapStorage& ms = mytab.mapstorage;
   448               ms.arrow_pos.set(active_edge,
   449                   (ms.coords[ms.graph.source(active_edge)] +
   450                    ms.coords[ms.graph.target(active_edge)])/ 2.0);
   451 
   452               //drawing new edge
   453               edgesmap[active_edge]=new BrokenEdge(displayed_graph, active_edge,
   454                   *this);
   455             }
   456             else
   457             {
   458               // set the coordinates of the arrow on the new edge
   459               MapStorage& ms = mytab.mapstorage;
   460               ms.arrow_pos.set(active_edge,
   461                   (ms.coords[ms.graph.source(active_edge)] +
   462                    XY(0.0, 80.0)));
   463 
   464               //drawing new edge
   465               edgesmap[active_edge]=new LoopEdge(displayed_graph, active_edge,
   466                   *this);
   467             }
   468 
   469             //initializing edge-text as well, to empty string
   470             XY text_pos=mytab.mapstorage.arrow_pos[active_edge];
   471             text_pos+=(XY(10,10));
   472 
   473             edgetextmap[active_edge]=new Gnome::Canvas::Text(displayed_graph,
   474                 text_pos.x, text_pos.y, "");
   475             edgetextmap[active_edge]->property_fill_color().set_value(
   476                 "darkgreen");
   477             edgetextmap[active_edge]->raise_to_top();
   478 
   479             propertyUpdate(active_edge);
   480           }
   481           //clicked item was not a node. it could be an e.g. edge. we do not
   482           //deal with it furthermore.
   483           else
   484           {
   485             target_item=NULL;
   486           }
   487         }
   488       }
   489       break;
   490     case GDK_BUTTON_RELEASE:
   491       isbutton=0;
   492       //we clear settings in two cases
   493       //1: the edge is ready (target_item has valid value)
   494       //2: the edge creation is cancelled with right button
   495       if((target_item)||(e->button.button==3))
   496       {
   497         if(active_item)
   498         {
   499           *active_item << Gnome::Canvas::Properties::fill_color("blue");
   500           active_item=NULL;
   501         }
   502         if(target_item)
   503         {
   504           *target_item << Gnome::Canvas::Properties::fill_color("blue");
   505           target_item=NULL;
   506         }
   507         active_node=INVALID;
   508         active_edge=INVALID;
   509       }
   510       break;
   511     default:
   512       break;
   513   }
   514   return false;
   515 }
   516 
   517 bool GraphDisplayerCanvas::eraserEventHandler(GdkEvent* e)
   518 {
   519   switch(e->type)
   520     {
   521     case GDK_BUTTON_PRESS:
   522       //finding the clicked items
   523       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
   524       active_item=(get_item_at(clicked_x, clicked_y));
   525       active_node=INVALID;
   526       active_edge=INVALID;
   527       //was it a node?
   528       for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   529 	{
   530 	  if(nodesmap[i]==active_item)
   531 	    {
   532 	      active_node=i;
   533 	    }
   534 	}
   535       //or was it an edge?
   536       if(active_node==INVALID)
   537 	{
   538 	  for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   539 	    {
   540 	      if(edgesmap[i]->getLine()==active_item)
   541 		{
   542 		  active_edge=i;
   543 		}
   544 	    }
   545 	}
   546 
   547       // return if the clicked object is neither an edge nor a node
   548       if (active_edge == INVALID) return false;
   549       
   550       //recolor activated item
   551       if(active_item)
   552 	{
   553 	  *active_item << Gnome::Canvas::Properties::fill_color("red");
   554 	}
   555       break;
   556 
   557     case GDK_BUTTON_RELEASE:
   558       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
   559       if(active_item)
   560 	{
   561 	  //the cursor was not moved since pressing it
   562 	  if( active_item == ( get_item_at (clicked_x, clicked_y) ) )
   563 	    {
   564 	      //a node was found
   565 	      if(active_node!=INVALID)
   566 		{
   567                   (mytab.mapstorage).modified = true;
   568 
   569 		  std::set<Graph::Edge> edges_to_delete;
   570 
   571 		  for(OutEdgeIt e((mytab.mapstorage).graph,active_node);e!=INVALID;++e)
   572 		    {
   573 		      edges_to_delete.insert(e);
   574 		    }
   575 		  
   576 		  for(InEdgeIt e((mytab.mapstorage).graph,active_node);e!=INVALID;++e)
   577 		    {
   578 		      edges_to_delete.insert(e);
   579 		    }
   580 		  
   581 		  //deleting collected edges
   582 		  for(std::set<Graph::Edge>::iterator
   583 			edge_set_it=edges_to_delete.begin();
   584 		      edge_set_it!=edges_to_delete.end();
   585 		      ++edge_set_it)
   586 		    {
   587 		      deleteItem(*edge_set_it);
   588 		    }
   589 		  deleteItem(active_node);
   590 		}
   591 	      //a simple edge was chosen
   592 	      else if (active_edge != INVALID)
   593 		{
   594 		  deleteItem(active_edge);
   595 		}
   596 	    }
   597 	  //pointer was moved, deletion is cancelled
   598 	  else
   599 	    {
   600 	      if(active_node!=INVALID)
   601 		{
   602 		  *active_item << Gnome::Canvas::Properties::fill_color("blue");
   603 		}
   604 	      else if (active_edge != INVALID)
   605 		{
   606 		  *active_item << Gnome::Canvas::Properties::fill_color("green");
   607 		}
   608 	    }
   609 	}
   610       //reseting datas
   611       active_item=NULL;
   612       active_edge=INVALID;
   613       active_node=INVALID;
   614       break;
   615 
   616     case GDK_MOTION_NOTIFY:
   617       break;
   618 
   619     default:
   620       break;
   621     }
   622   return false;
   623 }
   624 
   625 bool GraphDisplayerCanvas::mapEditEventHandler(GdkEvent* e)
   626 {
   627   if(actual_tool==MAP_EDIT)
   628     {
   629       switch(e->type)
   630 	{
   631 	case GDK_BUTTON_PRESS:
   632 	  {
   633 	    //for determine, whether it was an edge
   634 	    Edge clicked_edge=INVALID;
   635 	    //for determine, whether it was a node
   636 	    Node clicked_node=INVALID;
   637 
   638 	    window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);
   639 	    active_item=(get_item_at(clicked_x, clicked_y));
   640 
   641 	    //find the activated item between text of nodes
   642 	    for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   643 	      {
   644 		//at the same time only one can be active
   645 		if(nodetextmap[i]==active_item)
   646 		  {
   647 		    clicked_node=i;
   648 		  }
   649 	      }
   650 
   651 	    //if there was not, search for it between nodes
   652 	    if(clicked_node==INVALID)
   653 	      {
   654 		for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   655 		  {
   656 		    //at the same time only one can be active
   657 		    if(nodesmap[i]==active_item)
   658 		      {
   659 			clicked_node=i;
   660 		      }
   661 		  }
   662 	      }
   663 
   664 	    if(clicked_node==INVALID)
   665 	      {
   666 		//find the activated item between texts
   667 		for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   668 		  {
   669 		    //at the same time only one can be active
   670 		    if(edgetextmap[i]==active_item)
   671 		      {
   672 			clicked_edge=i;
   673 		      }
   674 		  }
   675 
   676 		//if it was not between texts, search for it between edges
   677 		if(clicked_edge==INVALID)
   678 		  {
   679 		    for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   680 		      {
   681 			//at the same time only one can be active
   682 			if((edgesmap[i]->getLine())==active_item)
   683 			  {
   684 			    clicked_edge=i;
   685 			  }
   686 		      }
   687 		  }
   688 	      }
   689 
   690 	    //if it was really a node...
   691 	    if(clicked_node!=INVALID)
   692 	      {
   693 		// the id map is not editable
   694 		if (nodemap_to_edit == "label") return 0;
   695 
   696 		//and there is activated map
   697 		if(nodetextmap[clicked_node]->property_text().get_value()!="")
   698 		  {
   699 		    //activate the general variable for it
   700 		    active_node=clicked_node;
   701 
   702 		    //create a dialog
   703 		    Gtk::Dialog dialog("Edit value", true);
   704 		    dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
   705 		    dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_ACCEPT);
   706 		    Gtk::VBox* vbox = dialog.get_vbox();
   707 		    Gtk::SpinButton spin(0.0, 4);
   708 		    spin.set_increments(1.0, 10.0);
   709 		    spin.set_range(-1000000.0, 1000000.0);
   710 		    spin.set_numeric(true);
   711 		    spin.set_value(atof(nodetextmap[active_node]->property_text().get_value().c_str()));
   712 		    vbox->add(spin);
   713 		    spin.show();
   714 		    switch (dialog.run())
   715 		      {
   716 		      case Gtk::RESPONSE_NONE:
   717 		      case Gtk::RESPONSE_CANCEL:
   718 			break;
   719 		      case Gtk::RESPONSE_ACCEPT:
   720 			double new_value = spin.get_value();
   721 			(*(mytab.mapstorage).nodemap_storage[nodemap_to_edit])[active_node] =
   722 			  new_value;
   723 			std::ostringstream ostr;
   724 			ostr << new_value;
   725 			nodetextmap[active_node]->property_text().set_value(ostr.str());
   726 			//mapwin.updateNode(active_node);
   727 			//mapwin.updateNode(Node(INVALID));
   728 			propertyUpdate(Node(INVALID));
   729 		      }
   730 		  }
   731 	      }
   732 	    else
   733 	      //if it was really an edge...
   734 	      if(clicked_edge!=INVALID)
   735 		{
   736 		  // the id map is not editable
   737 		  if (edgemap_to_edit == "label") return 0;
   738 
   739 		  //and there is activated map
   740 		  if(edgetextmap[clicked_edge]->property_text().get_value()!="")
   741 		    {
   742 		      //activate the general variable for it
   743 		      active_edge=clicked_edge;
   744 
   745 		      //create a dialog
   746 		      Gtk::Dialog dialog("Edit value", true);
   747 		      dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);
   748 		      dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_ACCEPT);
   749 		      Gtk::VBox* vbox = dialog.get_vbox();
   750 		      Gtk::SpinButton spin(0.0, 4);
   751 		      spin.set_increments(1.0, 10.0);
   752 		      spin.set_range(-1000000.0, 1000000.0);
   753 		      spin.set_numeric(true);
   754 		      spin.set_value(atof(edgetextmap[active_edge]->property_text().get_value().c_str()));
   755 		      vbox->add(spin);
   756 		      spin.show();
   757 		      switch (dialog.run())
   758 			{
   759 			case Gtk::RESPONSE_NONE:
   760 			case Gtk::RESPONSE_CANCEL:
   761 			  break;
   762 			case Gtk::RESPONSE_ACCEPT:
   763 			  double new_value = spin.get_value();
   764 			  (*(mytab.mapstorage).edgemap_storage[edgemap_to_edit])[active_edge] =
   765 			    new_value;
   766 			  std::ostringstream ostr;
   767 			  ostr << new_value;
   768 			  edgetextmap[active_edge]->property_text().set_value(
   769 									      ostr.str());
   770 			  //mapwin.updateEdge(active_edge);
   771 			  //                   mapwin.updateEdge(Edge(INVALID));
   772 			  propertyUpdate(Edge(INVALID));
   773 			}
   774 		    }
   775 		}
   776 	    break;
   777 	  }
   778 	default:
   779 	  break;
   780 	}
   781     }
   782   return false;  
   783 }
   784 
   785 void GraphDisplayerCanvas::deleteItem(Node node_to_delete)
   786 {
   787   delete(nodetextmap[node_to_delete]);
   788   delete(nodesmap[node_to_delete]);
   789   (mytab.mapstorage).graph.erase(node_to_delete);
   790 }
   791 
   792 void GraphDisplayerCanvas::deleteItem(Edge edge_to_delete)
   793 {
   794   delete(edgetextmap[edge_to_delete]);
   795   delete(edgesmap[edge_to_delete]);
   796   (mytab.mapstorage).graph.erase(edge_to_delete);
   797 }
   798 
   799 void GraphDisplayerCanvas::textReposition(XY new_place)
   800 {
   801   new_place+=(XY(10,10));
   802   edgetextmap[forming_edge]->property_x().set_value(new_place.x);
   803   edgetextmap[forming_edge]->property_y().set_value(new_place.y);
   804 }
   805 
   806 void GraphDisplayerCanvas::toggleEdgeActivity(EdgeBase* active_bre, bool on)
   807 {
   808   if(on)
   809   {
   810     if(forming_edge!=INVALID)
   811     {
   812       std::cerr << "ERROR!!!! Valid edge found!" << std::endl;
   813     }
   814     else
   815     {
   816       for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)
   817       {
   818         if(edgesmap[i]==active_bre)
   819         {
   820           forming_edge=i;
   821         }
   822       }
   823     }
   824   }
   825   else
   826   {
   827     if(forming_edge!=INVALID)
   828     {
   829       forming_edge=INVALID;
   830     }
   831     else
   832     {
   833       std::cerr << "ERROR!!!! Invalid edge found!" << std::endl;
   834     }
   835   }
   836 }