}

 }

 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;

 }