source: lemon-0.x/gui/graph_displayer_canvas-event.cc @ 1879:01d41844ef46

#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);

        // write back the new coordinates to the coords map
        (mytab.mapstorage).coords.set(active_node, xy<double>(coord_x, coord_y));

        clicked_x=new_x;
        clicked_y=new_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)
        {
            XY moved_node_1(coord_x - dx, coord_y - dy);
            XY moved_node_2(coord_x, coord_y);
            Node target = mytab.mapstorage.graph.target(ei);
            XY fix_node(mytab.mapstorage.coords[target].x,
                        mytab.mapstorage.coords[target].y);
            XY old_arrow_pos(mytab.mapstorage.arrow_pos[ei]);

            XY arrow_pos;
            if(isbutton==3)
              arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, false);
            else
              arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, true);

            mytab.mapstorage.arrow_pos.set(ei, arrow_pos);
            edgesmap[ei]->draw();

            //reposition of edgetext
            XY text_pos=mytab.mapstorage.arrow_pos[ei];
            text_pos+=(XY(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)
        {
            XY moved_node_1(coord_x - dx, coord_y - dy);
            XY moved_node_2(coord_x, coord_y);
            Node source = mytab.mapstorage.graph.source(ei);
            XY fix_node(mytab.mapstorage.coords[source].x,
                        mytab.mapstorage.coords[source].y);
            XY old_arrow_pos(mytab.mapstorage.arrow_pos[ei]);

            XY arrow_pos;
            if(isbutton==3)
              arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, false);
            else
              arrow_pos = calcArrowPos(moved_node_1, moved_node_2, fix_node, old_arrow_pos, true);

            mytab.mapstorage.arrow_pos.set(ei, arrow_pos);
            edgesmap[ei]->draw();

            //reposition of edgetext
            XY text_pos=mytab.mapstorage.arrow_pos[ei];
            text_pos+=(XY(10,10));
            edgetextmap[ei]->property_x().set_value(text_pos.x);
            edgetextmap[ei]->property_y().set_value(text_pos.y);
        }
      }
    default: break;
  }

  return false;
}

XY GraphDisplayerCanvas::calcArrowPos(XY moved_node_1, XY moved_node_2, XY fix_node, XY old_arrow_pos, bool move)
{
  if(!move)
  {
    return XY((moved_node_2.x + fix_node.x) / 2.0, (moved_node_2.y + fix_node.y) / 2.0);
  }
  else
  {
    //////////////////////////////////////////////////////////////////////////////////////////////////////
    /////////// keeps shape-with scalar multiplication - version 2.
    //////////////////////////////////////////////////////////////////////////////////////////////////////

    //old vector from one to the other node - a
    xy<double> a_v(moved_node_1.x-fix_node.x,moved_node_1.y-fix_node.y);
    //new vector from one to the other node - b
    xy<double> b_v(moved_node_2.x-fix_node.x,moved_node_2.y-fix_node.y);

    double absa=sqrt(a_v.normSquare());
    double absb=sqrt(b_v.normSquare());

    if ((absa == 0.0) || (absb == 0.0))
    {
      return old_arrow_pos;
    }
    else
    {
      //old vector from one node to the breakpoint - c
      xy<double> c_v(old_arrow_pos.x-fix_node.x,old_arrow_pos.y-fix_node.y);

      //unit vector with the same direction to a_v
      xy<double> a_v_u(a_v.x/absa,a_v.y/absa);

      //normal vector of unit vector with the same direction to a_v
      xy<double> a_v_u_n(((-1)*a_v_u.y),a_v_u.x);

      //unit vector with the same direction to b_v
      xy<double> b_v_u(b_v.x/absb,b_v.y/absb);

      //normal vector of unit vector with the same direction to b_v
      xy<double> b_v_u_n(((-1)*b_v_u.y),b_v_u.x);

      //vector c in a_v_u and a_v_u_n co-ordinate system
      xy<double> c_a(c_v*a_v_u,c_v*a_v_u_n);

      //new vector from one node to the breakpoint - d - we have to calculate this one
      xy<double> d_v=absb/absa*(c_a.x*b_v_u+c_a.y*b_v_u_n);

      return XY(d_v.x+fix_node.x,d_v.y+fix_node.y);
    }
  }
}

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, active_edge,
                  *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 text_pos=mytab.mapstorage.arrow_pos[active_edge];
              text_pos+=(XY(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;
        }
    }
}