int GraphDisplayerCanvas::changeLineWidth (std::string mapname)

 {

   for (EdgeIt i(g); i!=INVALID; ++i)

     {

       int w=(int)(*(mapstorage.edgemap_storage)[mapname])[i];

       if(w>=0)

 	{

 	  edgesmap[i]->property_width_pixels().set_value(w);

 	}

     }

   return 0;

 };

 int GraphDisplayerCanvas::changeColor (std::string mapname)

 {  

   //function maps the range of the maximum and

   //the minimum of the nodemap to the range of

   //green in RGB

   for (EdgeIt i(g); i!=INVALID; ++i)

   {

     double w=(*(mapstorage.edgemap_storage)[mapname])[i];

     double max=mapstorage.maxOfEdgeMap(mapname);

     double min=mapstorage.minOfEdgeMap(mapname);

     //std::cout<<w<<" "<<max<<" "<<min<<" "<<100*(w-min)/(max-min)<<std::endl;

     Gdk::Color color;

     if(max!=min)

     {

       color.set_rgb_p (0, 100*(w-min)/(max-min), 0);

     }

     else

     {

       color.set_rgb_p (0, 100, 0);

     }

     edgesmap[i]->property_fill_color_gdk().set_value(color);

   }

   return 0;

 };

 int GraphDisplayerCanvas::changeText (std::string mapname)

 {

   //the number in the map will be written on the edge

   //EXCEPT when the name of the map is Text, because

   //in that case empty string will be written, because

   //that is the deleter map

   //\todo isn't it a bit woodcutter?

   for (EdgeIt i(g); i!=INVALID; ++i)

     {

       if(mapname!="Text")

 	{

 	  double number=(*(mapstorage.edgemap_storage)[mapname])[i];

 	  int length=1;

 	  //if number is smaller than one, length would be negative, or invalid

 	  if(number>=1)

 	    {

 	      length=(int)(floor(log(number)/log(10)))+1;

 	    }

 	  int maxpos=(int)(pow(10,length-1));

 	  int strl=length+1+RANGE;

 	  char * str=new char[strl];

 	  str[length]='.';

 	  str[strl]='\0';

 	  for(int j=0;j<strl;j++)

 	    {

 	      if(j!=length)

 		{

 		  int digit=(int)(number/maxpos);

 		  str[j]=(digit+'0');

 		  number-=digit*maxpos;

 		  number*=10;

 		}

 	    }

 	  edgetextmap[i]->property_text().set_value(str);

 	}

       else

 	{

 	  edgetextmap[i]->property_text().set_value("");

 	}

     }

   return 0;

 };

 //Deprecated

 bool GraphDisplayerCanvas::event_handler(GdkEvent* e, Node n)

 {

   switch(e->type)

   {

     case GDK_BUTTON_PRESS:

       //we mark the location of the event to be able to calculate parameters of dragging

       clicked_x=e->button.x;

       clicked_y=e->button.y;

       active_item=(get_item_at(e->button.x, e->button.y));

       isbutton=1;

       break;

     case GDK_BUTTON_RELEASE:

       isbutton=0;

       active_item=NULL;

       updateScrollRegion();

       break;

     case GDK_MOTION_NOTIFY:

       //we only have to do sg. if the mouse button is pressed

       if(isbutton)

       {

 	//new coordinates will be the old values,

 	//because the item will be moved to the

 	//new coordinate therefore the new movement

 	//has to be calculated from here

         double dx=e->motion.x-clicked_x;

         double dy=e->motion.y-clicked_y;

         active_item->move(dx, dy);

         clicked_x=e->motion.x;

         clicked_y=e->motion.y;

 	//all the edges connected to the moved point has to be redrawn

         EdgeIt e;

         g.firstOut(e,n);

         for(;e!=INVALID;g.nextOut(e))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[g.source(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[g.target(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             edgesmap[e]->property_points().set_value(coos);

 	    edgesmap[e]->get_bounds(x1, y1, x2, y2);

 	    edgetextmap[e]->property_x().set_value((x1+x2)/2);

 	    edgetextmap[e]->property_y().set_value((y1+y2)/2);

         }

         g.firstIn(e,n);

         for(;e!=INVALID;g.nextIn(e))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[g.source(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[g.target(e)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             edgesmap[e]->property_points().set_value(coos);

 	    edgesmap[e]->get_bounds(x1, y1, x2, y2);

 	    edgetextmap[e]->property_x().set_value((x1+x2)/2);

 	    edgetextmap[e]->property_y().set_value((y1+y2)/2);

         }

       }

     default: break;

   }

   return true;

 }

 bool GraphDisplayerCanvas::on_expose_event(GdkEventExpose *event)

 {

   Gnome::Canvas::CanvasAA::on_expose_event(event);

   //usleep(10000);

   //rezoom();

   return true;

 }

 void GraphDisplayerCanvas::zoomIn()

 {

   set_pixels_per_unit(

       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());

 }

 void GraphDisplayerCanvas::zoomOut()

 {

   set_pixels_per_unit(

       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());

 }

 void GraphDisplayerCanvas::zoomFit()

 {

   // get the height and width of the canvas

   Gtk::Allocation a = get_allocation();

   int aw = a.get_width();

   int ah = a.get_height();

   // add some space

   aw -= 5; if (aw < 0) aw = 0;

   ah -= 5; if (ah < 0) ah = 0;

   // get the bounding box of the graph

   double wx1, wy1, wx2, wy2;

   Gnome::Canvas::Item* pCanvasItem = root();

   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);

   // fit the graph to the window

   double ppu1 = (double) aw / fabs(wx2 - wx1);

   double ppu2 = (double) ah / fabs(wy2 - wy1);

   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);

 }

 void GraphDisplayerCanvas::zoom100()

 {

   set_pixels_per_unit(1.0);

 }

 void GraphDisplayerCanvas::updateScrollRegion()

 {

   double wx1, wy1, wx2, wy2;

   Gnome::Canvas::Item* pCanvasItem = root();

   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);

   set_scroll_region(wx1, wy1, wx2, wy2);

 }

 void GraphDisplayerCanvas::changeEditorialTool(int newtool)

 {

   actual_handler.disconnect();

   if(actual_tool==CREATE_EDGE)

     {

 	GdkEvent * generated=new GdkEvent();

 	generated->type=GDK_BUTTON_RELEASE;

 	generated->button.button=3;

 	create_edge_event_handler(generated);      

     }

   actual_tool=newtool;

   switch(newtool)

     {

     case MOVE:

       actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::move_event_handler), false);

       break;

       //it has to assigned to canvas, because all the canvas has to be monitored, not only the elements of the already drawn group

     case CREATE_NODE:

       actual_handler=signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::create_node_event_handler), false);

       break;

     case CREATE_EDGE:

       actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::create_edge_event_handler), false);

       break;

     case ERASER:

       actual_handler=displayed_graph.signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::eraser_event_handler), false);

       break;

     default:

       break;

     }

 }

 int GraphDisplayerCanvas::get_actual_tool()

 {

   return actual_tool;

 }

 bool GraphDisplayerCanvas::move_event_handler(GdkEvent* e)

 {

   switch(e->type)

   {

     case GDK_BUTTON_PRESS:

       //we mark the location of the event to be able to calculate parameters of dragging

       clicked_x=e->button.x;

       clicked_y=e->button.y;

       active_item=(get_item_at(e->button.x, e->button.y));

       active_node=INVALID;

       for (NodeIt i(g); i!=INVALID; ++i)

 	{

 	  if(nodesmap[i]==active_item)

 	    {

 	      active_node=i;

 	    }

 	}

       switch(e->button.button)

 	{

 	case 3:      

 	  isbutton=3;

 	  break;

 	default:

 	  isbutton=1;

 	  break;

 	}

       break;

     case GDK_BUTTON_RELEASE:

       isbutton=0;

       active_item=NULL;

       active_node=INVALID;

       updateScrollRegion();

       break;

     case GDK_MOTION_NOTIFY:

       //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

       if(active_node!=INVALID)

       {

 	//new coordinates will be the old values,

 	//because the item will be moved to the

 	//new coordinate therefore the new movement

 	//has to be calculated from here

         double dx=e->motion.x-clicked_x;

         double dy=e->motion.y-clicked_y;

         active_item->move(dx, dy);

         clicked_x=e->motion.x;

         clicked_y=e->motion.y;

 	//all the edges connected to the moved point has to be redrawn

         EdgeIt ei;

         g.firstOut(ei,active_node);

         for(;ei!=INVALID;g.nextOut(ei))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[g.source(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[g.target(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

 	    if(isbutton==3)

 	      {

 		edgesmap[ei]->set_points(coos);

 	      }

 	    else

 	      {

 		edgesmap[ei]->set_points(coos,true);

 	      }

 	    xy<double> text_pos=edgesmap[ei]->get_arrow_pos();

 	    text_pos+=(xy<double>(10,10));

 	    edgetextmap[ei]->property_x().set_value(text_pos.x);

 	    edgetextmap[ei]->property_y().set_value(text_pos.y);

         }

         g.firstIn(ei,active_node);

         for(;ei!=INVALID;g.nextIn(ei))

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

             nodesmap[g.source(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

             nodesmap[g.target(ei)]->get_bounds(x1, y1, x2, y2);

             coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

 	    if(isbutton==3)

 	      {

 		edgesmap[ei]->set_points(coos);

 	      }

 	    else

 	      {

 		edgesmap[ei]->set_points(coos,true);

 	      }

 	    xy<double> text_pos=edgesmap[ei]->get_arrow_pos();

 	    text_pos+=(xy<double>(10,10));

 	    edgetextmap[ei]->property_x().set_value(text_pos.x);

 	    edgetextmap[ei]->property_y().set_value(text_pos.y);

         }

       }

     default: break;

   }

   return true;

 }

 bool GraphDisplayerCanvas::create_node_event_handler(GdkEvent* e)

 {

   switch(e->type)

     {

       //draw the new node in red at the clicked place

     case GDK_BUTTON_PRESS:

       isbutton=1;

       active_node=NodeIt(g,g.addNode());

       //initiating values corresponding to new node in maps

       window_to_world (e->button.x, e->button.y, clicked_x, clicked_y);

       nodesmap[active_node]=new Gnome::Canvas::Ellipse(displayed_graph, clicked_x-20, clicked_y-20, clicked_x+20, clicked_y+20);

       active_item=(Gnome::Canvas::Item *)(nodesmap[active_node]);

       *(nodesmap[active_node]) << Gnome::Canvas::Properties::fill_color("red");

       *(nodesmap[active_node]) << Gnome::Canvas::Properties::outline_color("black");

       (nodesmap[active_node])->show();

       break;

       //move the new node

     case GDK_MOTION_NOTIFY:

       {

 	double world_motion_x, world_motion_y;

 	GdkEvent * generated=new GdkEvent();

 	window_to_world (e->motion.x, e->motion.y, world_motion_x, world_motion_y);

 	generated->motion.x=world_motion_x;

 	generated->motion.y=world_motion_y;

 	generated->type=GDK_MOTION_NOTIFY;

 	move_event_handler(generated);      

 	break;

       }

       //finalize the new node

     case GDK_BUTTON_RELEASE:

       isbutton=0;

       *active_item << Gnome::Canvas::Properties::fill_color("blue");

       active_item=NULL;

       active_node=INVALID;

       updateScrollRegion();

       break;

     default:

       break;

     }

   return false;

 }

 bool GraphDisplayerCanvas::create_edge_event_handler(GdkEvent* e)

 {

   switch(e->type)

     {

     case GDK_BUTTON_PRESS:

       //in edge creation right button has special meaning

       if(e->button.button!=3)

 	{

 	  //there is not yet selected node

 	  if(active_node==INVALID)

 	    {

 	      //we mark the location of the event to be able to calculate parameters of dragging

 	      clicked_x=e->button.x;

 	      clicked_y=e->button.y;

 	      active_item=(get_item_at(e->button.x, e->button.y));

 	      active_node=INVALID;

 	      for (NodeIt i(g); i!=INVALID; ++i)

 		{

 		  if(nodesmap[i]==active_item)

 		    {

 		      active_node=i;

 		    }

 		}

 	      //the clicked item is really a node

 	      if(active_node!=INVALID)

 		{

 		  *(nodesmap[active_node]) << Gnome::Canvas::Properties::fill_color("red");

 		  isbutton=1;

 		}

 	      //clicked item was not a node. It could be e.g. edge.

 	      else

 		{

 		  active_item=NULL;

 		}

 	    }

 	  //we only have to do sg. if the mouse button

 	  // is pressed already once AND the click was

 	  // on a node that was found in the set of 

 	  //nodes, and now we only search for the second 

 	  //node

 	  else

 	    {

 	      target_item=(get_item_at(e->button.x, e->button.y));

 	      Graph::NodeIt target_node=INVALID;

 	      for (NodeIt i(g); i!=INVALID; ++i)

 		{

 		  if(nodesmap[i]==target_item)

 		    {

 		      target_node=i;

 		    }

 		}

 	      //the clicked item is a node, the edge can be drawn

 	      if(target_node!=INVALID)

 		{

 		  *(nodesmap[target_node]) << Gnome::Canvas::Properties::fill_color("red");

 		  //creating new edge

 		  active_edge=EdgeIt(g,g.addEdge(active_node, target_node));

 		  //initiating values corresponding to new edge in maps

 		  mapstorage.init_maps_for_edge(active_edge);

 		  //calculating coordinates of new edge

 		  Gnome::Canvas::Points coos;

 		  double x1, x2, y1, y2;

 		  active_item->get_bounds(x1, y1, x2, y2);

 		  coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

 		  target_item->get_bounds(x1, y1, x2, y2);

 		  coos.push_back(Gnome::Art::Point((x1+x2)/2,(y1+y2)/2));

 		  //drawing new edge

 		  edgesmap[active_edge]=new BrokenEdge(displayed_graph, coos, *this);

 		  *(edgesmap[active_edge]) << Gnome::Canvas::Properties::fill_color("green");

 		  edgesmap[active_edge]->property_width_pixels().set_value(10);

 		  //redraw nodes to blank terminations of the new edge

 		  target_item->raise_to_top();

 		  active_item->raise_to_top();

 		  //initializing edge-text as well, to empty string

 		  xy<double> text_pos=edgesmap[active_edge]->get_arrow_pos();

 		  text_pos+=(xy<double>(10,10));

 		  edgetextmap[active_edge]=new Gnome::Canvas::Text(displayed_graph, text_pos.x, text_pos.y, "");

 		  edgetextmap[active_edge]->property_fill_color().set_value("black");

 		}

 	      //clicked item was not a node. it could be an e.g. edge. we do not deal with it furthermore.

 	      else

 		{

 		  target_item=NULL;

 		}

 	    }

 	}

       break;

     case GDK_BUTTON_RELEASE:

       isbutton=0;

       //we clear settings in two cases

       //1: the edge is ready (target_item has valid value)

       //2: the edge creation is cancelled with right button

       if((target_item)||(e->button.button==3))

 	{

 	  if(active_item)

 	    {

 	      *active_item << Gnome::Canvas::Properties::fill_color("blue");

 	      active_item=NULL;

 	    }

 	  if(target_item)

 	    {

 	      *target_item << Gnome::Canvas::Properties::fill_color("blue");

 	      target_item=NULL;

 	    }

 	  active_node=INVALID;

 	  active_edge=INVALID;

 	}

       break;

     default:

       break;

     }

   return false;

 }

 bool GraphDisplayerCanvas::eraser_event_handler(GdkEvent* e)

 {

   switch(e->type)

     {

     case GDK_BUTTON_PRESS:

       active_item=(get_item_at(e->button.x, e->button.y));

       active_node=INVALID;

       active_edge=INVALID;

       for (NodeIt i(g); i!=INVALID; ++i)

 	{

 	  if(nodesmap[i]==active_item)

 	    {

 	      active_node=i;

 	    }

 	}

       if(active_node==INVALID)

 	{

 	  for (EdgeIt i(g); i!=INVALID; ++i)

 	    {

 	      if(edgesmap[i]==active_item)

 		{

 		  active_edge=i;

 		}

 	    }

 	}

     *active_item << Gnome::Canvas::Properties::fill_color("red");

       break;

     case GDK_BUTTON_RELEASE:

       if(active_item==(get_item_at(e->button.x, e->button.y)))

 	{

 	  if(active_node!=INVALID)

 	    {

 	      //collecting edges to delete

 	      EdgeIt e;

 	      std::set<Graph::Edge> edges_to_delete;

 	      g.firstOut(e,active_node);

 	      for(;e!=INVALID;g.nextOut(e))

 		{

 		      edges_to_delete.insert(e);

 		}

 	      g.firstIn(e,active_node);

 	      for(;e!=INVALID;g.nextIn(e))

 		{

 		      edges_to_delete.insert(e);

 		}

 	      //deleting collected edges

 	      for(std::set<Graph::Edge>::iterator edge_set_it=edges_to_delete.begin();edge_set_it!=edges_to_delete.end();edge_set_it++)

 		{

 		  delete_item(*edge_set_it);

 		}

 	      delete_item(active_node);

 	    }

 	  //a simple edge was chosen

 	  else

 	    {

 	      delete_item(active_edge);

 	    }

 	}

       //pointer was moved, deletion is cancelled

       else

 	{

 	  if(active_node!=INVALID)

 	    {

 	      *active_item << Gnome::Canvas::Properties::fill_color("blue");

 	    }

 	  else

 	    {

 	      *active_item << Gnome::Canvas::Properties::fill_color("green");

 	    }

 	}

       //reseting datas

       active_item=NULL;

       active_edge=INVALID;

       active_node=INVALID;

       break;

     case GDK_MOTION_NOTIFY:

       break;

     default:

       break;

     }

   return true;

 }

 void GraphDisplayerCanvas::delete_item(NodeIt node_to_delete)

 {

   delete(nodesmap[node_to_delete]);

   g.erase(node_to_delete);

 }

 void GraphDisplayerCanvas::delete_item(EdgeIt edge_to_delete)

 {

   delete(edgesmap[edge_to_delete]);

   g.erase(edge_to_delete);

 }

 void GraphDisplayerCanvas::delete_item(Graph::Edge edge_to_delete)

 {

   delete(edgesmap[edge_to_delete]);

   g.erase(edge_to_delete);

 }

 void GraphDisplayerCanvas::text_reposition(xy<double> new_place)

 {

   new_place+=(xy<double>(10,10));

   edgetextmap[active_edge]->property_x().set_value(new_place.x);

   edgetextmap[active_edge]->property_y().set_value(new_place.y);

 }

 void GraphDisplayerCanvas::toggle_edge_activity(BrokenEdge* active_bre, bool on)

 {

   if(on)

     {

       if(active_edge!=INVALID)

 	{

 	  std::cout << "ERROR!!!! Valid edge found!" << std::endl;

 	}

       else

 	{

 	  for (EdgeIt i(g); i!=INVALID; ++i)

 	    {

 	      if(edgesmap[i]==active_bre)

 		{

 		  active_edge=i;

 		}

 	    }

 	}

     }

   else

     {

       if(active_edge!=INVALID)

 	{

 	  active_edge=INVALID;

 	}

       else

 	{

 	  std::cout << "ERROR!!!! Invalid edge found!" << std::endl;

 	}

     }

 }