#include "graph_displayer_canvas.h"

 #include <cmath>

 bool GraphDisplayerCanvas::on_expose_event(GdkEventExpose *event)

 {

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

   //usleep(10000);

   //rezoom();

   return true;

 }

 void GraphDisplayerCanvas::changeEditorialTool(int newtool)

 {

   if(actual_tool!=newtool)

     {

       actual_handler.disconnect();

       switch(actual_tool)

 	{

 	case CREATE_EDGE:

 	  {

 	    GdkEvent * generated=new GdkEvent();

 	    generated->type=GDK_BUTTON_RELEASE;

 	    generated->button.button=3;

 	    createEdgeEventHandler(generated);      

 	    break;

 	  }

 	case EDGE_MAP_EDIT:

 	  //has to do the same thing as in the case of NODE_MAP_EDIT

 	case NODE_MAP_EDIT:

 	  {

 	    break;

 	  }

 	default:

 	  break;

 	}

       active_item=NULL; 

       target_item=NULL; 

       active_edge=INVALID;	

       active_node=INVALID;	

       actual_tool=newtool;

       switch(newtool)

 	{

 	case MOVE:

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

 	  break;

 	case CREATE_NODE:

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

 	  break;

 	case CREATE_EDGE:

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

 	  break;

 	case ERASER:

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

 	  break;

 	case EDGE_MAP_EDIT:

 	  grab_focus();

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

 	  break;

 	case NODE_MAP_EDIT:

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

 	  break;

 	default:

 	  break;

 	}

     }

 }

 int GraphDisplayerCanvas::getActualTool()

 {

   return actual_tool;

 }

 bool GraphDisplayerCanvas::moveEventHandler(GdkEvent* e)

 {

   static Gnome::Canvas::Text *coord_text = 0;

   switch(e->type)

   {

     case GDK_BUTTON_PRESS:

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

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

       active_item=(get_item_at(clicked_x, clicked_y));

       active_node=INVALID;

       for (NodeIt i((mytab.mapstorage).graph); 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:

       if (coord_text)

       {

         delete coord_text;

         coord_text = 0;

       }

       isbutton=0;

       active_item=NULL;

       active_node=INVALID;

       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)

       {

         (mytab.mapstorage).modified = true;

 	//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 new_x, new_y;

 	window_to_world (e->motion.x, e->motion.y, new_x, new_y);

         double dx=new_x-clicked_x;

         double dy=new_y-clicked_y;

 	//repositioning node and its text

         active_item->move(dx, dy);

 	nodetextmap[active_node]->move(dx, dy);

         // the new coordinates of the centre of the node 

         double coord_x = new_x - (clicked_x - (mytab.mapstorage).coords[active_node].x);

         double coord_y = new_y - (clicked_y - (mytab.mapstorage).coords[active_node].y);

         clicked_x=new_x;

         clicked_y=new_y;

         // write back the new coordinates to the coords map

         (mytab.mapstorage).coords.set(active_node, xy<double>(coord_x, coord_y));

         // reposition the coordinates text

         std::ostringstream ostr;

         ostr << "(" <<

           (mytab.mapstorage).coords[active_node].x << ", " <<

           (mytab.mapstorage).coords[active_node].y << ")";

         double radius =

           (nodesmap[active_node]->property_x2().get_value() -

           nodesmap[active_node]->property_x1().get_value()) / 2.0;

         if (coord_text)

         {

           coord_text->property_text().set_value(ostr.str());

           coord_text->property_x().set_value((mytab.mapstorage).coords[active_node].x +

               radius);

           coord_text->property_y().set_value((mytab.mapstorage).coords[active_node].y -

               radius);

         }

         else

         {

           coord_text = new Gnome::Canvas::Text(

               displayed_graph,

               (mytab.mapstorage).coords[active_node].x + radius,

               (mytab.mapstorage).coords[active_node].y - radius,

               ostr.str());

           coord_text->property_fill_color().set_value("black");

           coord_text->property_anchor().set_value(Gtk::ANCHOR_SOUTH_WEST);

         }

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

         for(OutEdgeIt ei((mytab.mapstorage).graph,active_node);ei!=INVALID;++ei)

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

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

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

             nodesmap[(mytab.mapstorage).graph.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]->setPoints(coos);

 	      }

 	    else

 	      {

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

 	      }

 	    //reposition of edgetext

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

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

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

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

         }

         for(InEdgeIt ei((mytab.mapstorage).graph,active_node);ei!=INVALID;++ei)

         {

             Gnome::Canvas::Points coos;

             double x1, x2, y1, y2;

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

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

             nodesmap[(mytab.mapstorage).graph.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]->setPoints(coos);

 	      }

 	    else

 	      {

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

 	      }

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

 	    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 false;

 }

 bool GraphDisplayerCanvas::createNodeEventHandler(GdkEvent* e)

 {

   switch(e->type)

   {

     //move the new node

     case GDK_MOTION_NOTIFY:

       {

         GdkEvent * generated=new GdkEvent();

         generated->motion.x=e->motion.x;

         generated->motion.y=e->motion.y;

         generated->type=GDK_MOTION_NOTIFY;

         moveEventHandler(generated);      

         break;

       }

     case GDK_BUTTON_RELEASE:

       (mytab.mapstorage).modified = true;

       isbutton=1;

       active_node=(mytab.mapstorage).graph.addNode();

       //initiating values corresponding to new node in maps

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

       // update coordinates

       (mytab.mapstorage).coords.set(active_node, xy<double>(clicked_x, clicked_y));

       // update all other maps

       for (std::map<std::string, Graph::NodeMap<double>*>::const_iterator it =

           (mytab.mapstorage).nodemap_storage.begin(); it !=

           (mytab.mapstorage).nodemap_storage.end(); ++it)

       {

         if ((it->first != "coordinates_x") &&

             (it->first != "coordinates_y"))

         {

           (*(it->second))[active_node] =

             (mytab.mapstorage).nodemap_default[it->first];

         }

       }

       // increment the id map's default value

       (mytab.mapstorage).nodemap_default["id"] += 1.0;

       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("blue");

       *(nodesmap[active_node]) <<

         Gnome::Canvas::Properties::outline_color("black");

       active_item->raise_to_top();

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

       nodetextmap[active_node]=new Gnome::Canvas::Text(displayed_graph,

           clicked_x+node_property_defaults[N_RADIUS]+5,

           clicked_y+node_property_defaults[N_RADIUS]+5, "");

       nodetextmap[active_node]->property_fill_color().set_value("darkblue");

       nodetextmap[active_node]->raise_to_top();

 //       mapwin.updateNode(active_node);

       propertyUpdate(active_node);

       isbutton=0;

       target_item=NULL;

       active_item=NULL;

       active_node=INVALID;

       break;

     default:

       break;

   }

   return false;

 }

 bool GraphDisplayerCanvas::createEdgeEventHandler(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

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

           active_item=(get_item_at(clicked_x, clicked_y));

           active_node=INVALID;

           for (NodeIt i((mytab.mapstorage).graph); 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

         {

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

           target_item=(get_item_at(clicked_x, clicked_y));

           Node target_node=INVALID;

           for (NodeIt i((mytab.mapstorage).graph); 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)

           {

             if(target_node!=active_node)		

             {

               (mytab.mapstorage).modified = true;

               *(nodesmap[target_node]) <<

                 Gnome::Canvas::Properties::fill_color("red");

               //creating new edge

               active_edge=(mytab.mapstorage).graph.addEdge(active_node,

                   target_node);

               // update maps

               for (std::map<std::string,

                   Graph::EdgeMap<double>*>::const_iterator it =

                   (mytab.mapstorage).edgemap_storage.begin(); it !=

                   (mytab.mapstorage).edgemap_storage.end(); ++it)

               {

                 (*(it->second))[active_edge] =

                   (mytab.mapstorage).edgemap_default[it->first];

               }

               // increment the id map's default value

               (mytab.mapstorage).edgemap_default["id"] += 1.0;

               //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);

               edgesmap[active_edge]->lower_to_bottom();

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

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

               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(

                   "darkgreen");

               edgetextmap[active_edge]->raise_to_top();

               //updating its properties

 //               mapwin.updateEdge(active_edge);

               propertyUpdate(active_edge);

             }

             else

             {

               target_node=INVALID;

               std::cerr << "Loop edge is not yet implemented!" << std::endl;

             }

           }

           //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::eraserEventHandler(GdkEvent* e)

 {

   switch(e->type)

     {

     case GDK_BUTTON_PRESS:

       //finding the clicked items

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

       active_item=(get_item_at(clicked_x, clicked_y));

       active_node=INVALID;

       active_edge=INVALID;

       //was it a node?

       for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

 	{

 	  if(nodesmap[i]==active_item)

 	    {

 	      active_node=i;

 	    }

 	}

       //or was it an edge?

       if(active_node==INVALID)

 	{

 	  for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

 	    {

 	      if(edgesmap[i]==active_item)

 		{

 		  active_edge=i;

 		}

 	    }

 	}

       //recolor activated item

       if(active_item)

 	{

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

 	}

       break;

     case GDK_BUTTON_RELEASE:

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

       if(active_item)

 	{

 	  //the cursor was not moved since pressing it

 	  if( active_item == ( get_item_at (clicked_x, clicked_y) ) )

 	    {

 	      //a node was found

 	      if(active_node!=INVALID)

 		{

                   (mytab.mapstorage).modified = true;

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

 		  for(OutEdgeIt e((mytab.mapstorage).graph,active_node);e!=INVALID;++e)

 		    {

 		      edges_to_delete.insert(e);

 		    }

 		  for(InEdgeIt e((mytab.mapstorage).graph,active_node);e!=INVALID;++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)

 		    {

 		      deleteItem(*edge_set_it);

 		    }

 		  deleteItem(active_node);

 		}

 	      //a simple edge was chosen

 	      else

 		{

 		  deleteItem(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 false;

 }

 bool GraphDisplayerCanvas::edgeMapEditEventHandler(GdkEvent* e)

 {

   if(actual_tool==EDGE_MAP_EDIT)

   {

     switch(e->type)

     {

       case GDK_BUTTON_PRESS:

         {

           //for determine, whether it was an edge

           Edge clicked_edge=INVALID;

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

           active_item=(get_item_at(clicked_x, clicked_y));

           //find the activated item between texts

           for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

           {

             //at the same time only one can be active

             if(edgetextmap[i]==active_item)

             {

               clicked_edge=i;

             }

           }

           //if it was not between texts, search for it between edges

           if(clicked_edge==INVALID)

           {

             for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

             {

               //at the same time only one can be active

               if((edgesmap[i]==active_item)||(edgetextmap[i]==active_item))

               {

                 clicked_edge=i;

               }

             }

           }

           //if it was really an edge...

           if(clicked_edge!=INVALID)

           {

             // the id map is not editable

             if (edgemap_to_edit == "id") return 0;

             //and there is activated map

             if(edgetextmap[clicked_edge]->property_text().get_value()!="")

             {

               //activate the general variable for it

               active_edge=clicked_edge;

               //create a dialog

               Gtk::Dialog dialog("Edit value", true);

               dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);

               dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_ACCEPT);

               Gtk::VBox* vbox = dialog.get_vbox();

               Gtk::SpinButton spin(0.0, 4);

               spin.set_increments(1.0, 10.0);

               spin.set_range(-1000000.0, 1000000.0);

               spin.set_numeric(true);

               vbox->add(spin);

               spin.show();

               switch (dialog.run())

               {

                 case Gtk::RESPONSE_NONE:

                 case Gtk::RESPONSE_CANCEL:

                   break;

                 case Gtk::RESPONSE_ACCEPT:

                   double new_value = spin.get_value();

                   (*(mytab.mapstorage).edgemap_storage[edgemap_to_edit])[active_edge] =

                     new_value;

                   std::ostringstream ostr;

                   ostr << new_value;

                   edgetextmap[active_edge]->property_text().set_value(

                       ostr.str());

                   //mapwin.updateEdge(active_edge);

 //                   mapwin.updateEdge(Edge(INVALID));

                   propertyUpdate(Edge(INVALID));

               }

             }

           }

           break;

         }

       default:

         break;

     }

   }

   return false;  

 }

 bool GraphDisplayerCanvas::nodeMapEditEventHandler(GdkEvent* e)

 {

   if(actual_tool==NODE_MAP_EDIT)

   {

     switch(e->type)

     {

       case GDK_BUTTON_PRESS:

         {

           //for determine, whether it was a node

           Node clicked_node=INVALID;

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

           active_item=(get_item_at(clicked_x, clicked_y));

           //find the activated item between texts

           for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

           {

             //at the same time only one can be active

             if(nodetextmap[i]==active_item)

             {

               clicked_node=i;

             }

           }

           //if there was not, search for it between nodes

           if(clicked_node==INVALID)

           {

             for (NodeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

             {

               //at the same time only one can be active

               if(nodesmap[i]==active_item)

               {

                 clicked_node=i;

               }

             }

           }

           //if it was really a node...

           if(clicked_node!=INVALID)

           {

             // the id map is not editable

             if (nodemap_to_edit == "id") return 0;

             //and there is activated map

             if(nodetextmap[clicked_node]->property_text().get_value()!="")

             {

               //activate the general variable for it

               active_node=clicked_node;

               //create a dialog

               Gtk::Dialog dialog("Edit value", true);

               dialog.add_button(Gtk::Stock::CANCEL, Gtk::RESPONSE_CANCEL);

               dialog.add_button(Gtk::Stock::OK, Gtk::RESPONSE_ACCEPT);

               Gtk::VBox* vbox = dialog.get_vbox();

               Gtk::SpinButton spin(0.0, 4);

               spin.set_increments(1.0, 10.0);

               spin.set_range(-1000000.0, 1000000.0);

               spin.set_numeric(true);

               vbox->add(spin);

               spin.show();

               switch (dialog.run())

               {

                 case Gtk::RESPONSE_NONE:

                 case Gtk::RESPONSE_CANCEL:

                   break;

                 case Gtk::RESPONSE_ACCEPT:

                   double new_value = spin.get_value();

                   (*(mytab.mapstorage).nodemap_storage[nodemap_to_edit])[active_node] =

                     new_value;

                   std::ostringstream ostr;

                   ostr << new_value;

                   nodetextmap[active_node]->property_text().set_value(

                       ostr.str());

                   //mapwin.updateNode(active_node);

 //                   mapwin.updateNode(Node(INVALID));

                   propertyUpdate(Node(INVALID));

               }

             }

           }

           break;

         }

       default:

         break;

     }

   }

   return false;  

 }

 void GraphDisplayerCanvas::deleteItem(Node node_to_delete)

 {

   delete(nodetextmap[node_to_delete]);

   delete(nodesmap[node_to_delete]);

   (mytab.mapstorage).graph.erase(node_to_delete);

 }

 void GraphDisplayerCanvas::deleteItem(Edge edge_to_delete)

 {

   delete(edgetextmap[edge_to_delete]);

   delete(edgesmap[edge_to_delete]);

   (mytab.mapstorage).graph.erase(edge_to_delete);

 }

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

 {

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

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

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

 }

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

 {

   if(on)

     {

       if(forming_edge!=INVALID)

 	{

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

 	}

       else

 	{

 	  for (EdgeIt i((mytab.mapstorage).graph); i!=INVALID; ++i)

 	    {

 	      if(edgesmap[i]==active_bre)

 		{

 		  forming_edge=i;

 		}

 	    }

 	}

     }

   else

     {

       if(forming_edge!=INVALID)

 	{

 	  forming_edge=INVALID;

 	}

       else

 	{

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

 	}

     }

 }

 int GraphDisplayerCanvas::addNewEdgeMap(double default_value, std::string mapname)

 {

   //create the new map

   Graph::EdgeMap<double> * emptr=new Graph::EdgeMap<double> ((mytab.mapstorage).graph, default_value);

   //if addition was not successful addEdgeMap returns one.

   //cause can be that there is already a map named like the new one

   if((mytab.mapstorage).addEdgeMap(mapname,emptr, default_value))

     {

       return 1;

     }

   //add it to the list of the displayable maps

   mytab.registerNewEdgeMap(mapname);

   //display it

   changeEdgeText(mapname);

   return 0;

 }

 int GraphDisplayerCanvas::addNewNodeMap(double default_value, std::string mapname)

 {

   //create the new map

   Graph::NodeMap<double> * emptr=new Graph::NodeMap<double> ((mytab.mapstorage).graph,default_value);

   //if addition was not successful addNodeMap returns one.

   //cause can be that there is already a map named like the new one

   if((mytab.mapstorage).addNodeMap(mapname,emptr, default_value))

     {

       return 1;

     }

   //add it to the list of the displayable maps

   mytab.registerNewNodeMap(mapname);

   //display it

   changeNodeText(mapname);

   return 0;

 }