/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2006

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #include "graph_displayer_canvas.h"

 #include <lemon/random.h>

 #include <cmath>

 GraphDisplayerCanvas::GraphDisplayerCanvas(NoteBookTab & mainw) :

   nodesmap(mainw.mapstorage.graph), edgesmap(mainw.mapstorage.graph), edgetextmap(mainw.mapstorage.graph),

   nodetextmap(mainw.mapstorage.graph), displayed_graph(*(root()), 0, 0),

   isbutton(0), active_item(NULL), target_item(NULL), nodemap_to_edit(""),

   edgemap_to_edit(""), autoscale(true), zoomtrack(false), radius_size(20), edge_width(10),

   was_redesigned(false), is_drawn(false), mytab(mainw),

   background_set(false)

 {

   //base event handler is move tool

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

   actual_tool=MOVE;

   active_node=INVALID;

   active_edge=INVALID;

   forming_edge=INVALID;

   setBackground();

 }

 void GraphDisplayerCanvas::setBackground()

 {

   if (background_set)

   {

     delete background;

   }

   if (mytab.mapstorage.isBackgroundSet())

   {

     background_set = true;

     refBackground = Gdk::Pixbuf::create_from_file(

       mytab.mapstorage.getBackgroundFilename());

     background = new Gnome::Canvas::Pixbuf(

         *(root()),

         0.0 - refBackground->get_width() / 2.0,

         0.0 - refBackground->get_height() / 2.0,

         refBackground);

     background->lower_to_bottom();

   }

   else

   {

     background_set = false;

   }

 }

 GraphDisplayerCanvas::~GraphDisplayerCanvas()

 {

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

     {

       delete nodesmap[n];

       delete nodetextmap[n];

     }

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

     {

       delete edgesmap[e];

       delete edgetextmap[e];

     }

 }

 void GraphDisplayerCanvas::propertyChange(bool itisedge, int prop)

 {

   if(itisedge)

     {

       propertyUpdate(Edge(INVALID), prop);

     }

   else

     {

       propertyUpdate(Node(INVALID), prop);

     }

 }

 void GraphDisplayerCanvas::propertyUpdate(Edge edge)

 {

   for(int i=0;i<EDGE_PROPERTY_NUM;i++)

     {

       propertyUpdate(edge, i);

     }

 }

 void GraphDisplayerCanvas::propertyUpdate(Node node)

 {

   for(int i=0;i<NODE_PROPERTY_NUM;i++)

     {

       propertyUpdate(node, i);

     }

 }

 void GraphDisplayerCanvas::propertyUpdate(Node node, int prop)

 {

   std::string mapname=mytab.getActiveNodeMap(prop);

   if(is_drawn)

     {

       if(mapname!="")

 	{

 	  if( ( ((mytab.mapstorage).nodemap_storage).find(mapname) != ((mytab.mapstorage).nodemap_storage).end() ) )

 	    {

 	      switch(prop)

 		{

 		case N_RADIUS:

 		  changeNodeRadius(mapname, node);

 		  break;

 		case N_COLOR:

 		  changeNodeColor(mapname, node);

 		  break;

 		case N_TEXT:

 		  changeNodeText(mapname, node);

 		  break;

 		default:

 		  std::cerr<<"Error\n";

 		}

 	    }

 	}

       else //mapname==""

 	{

 	  Node node=INVALID;	

 	  switch(prop)

 	    {

 	    case N_RADIUS:

 	      resetNodeRadius(node);

 	      break;

 	    case N_COLOR:

 	      resetNodeColor(node);

 	      break;

 	    case N_TEXT:

 	      resetNodeText(node);

 	      break;

 	    default:

 	      std::cerr<<"Error\n";

 	    }

 	}

     }

 }

 void GraphDisplayerCanvas::propertyUpdate(Edge edge, int prop)

 {

   std::string mapname=mytab.getActiveEdgeMap(prop);

   if(is_drawn)

     {

       if(mapname!="")

 	{

 	  if( ( ((mytab.mapstorage).edgemap_storage).find(mapname) != ((mytab.mapstorage).edgemap_storage).end() ) )

 	    {

 	      switch(prop)

 		{

 		case E_WIDTH:

 		  changeEdgeWidth(mapname, edge);

 		  break;

 		case E_COLOR:

 		  changeEdgeColor(mapname, edge);

 		  break;

 		case E_TEXT:

 		  changeEdgeText(mapname, edge);

 		  break;

 		default:

 		  std::cerr<<"Error\n";

 		}

 	    }

 	}

       else //mapname==""

 	{

 	  switch(prop)

 	    {

 	    case E_WIDTH:

 	      resetEdgeWidth(edge);

 	      break;

 	    case E_COLOR:

 	      resetEdgeColor(edge);

 	      break;

 	    case E_TEXT:

 	      resetEdgeText(edge);

 	      break;

 	    default:

 	      std::cerr<<"Error\n";

 	    }

 	}

     }

 }

 void GraphDisplayerCanvas::drawGraph()

 {

   //first edges are drawn, to hide joining with nodes later

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

   {

     if (mytab.mapstorage.graph.source(i) == mytab.mapstorage.graph.target(i))

     {

       edgesmap[i]=new LoopEdge(displayed_graph, i, *this);

     }

     else

     {

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

     }

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

     XY text_pos=mytab.mapstorage.arrow_pos[i];

     text_pos+=(XY(10,10));

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

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

     edgetextmap[i]->signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::mapEditEventHandler), false);

     edgetextmap[i]->raise_to_top();

   }

   //afterwards nodes come to be drawn

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

   {

     //drawing bule nodes, with black line around them

     nodesmap[i]=new Gnome::Canvas::Ellipse(

         displayed_graph,

         (mytab.mapstorage).coords[i].x-20,

         (mytab.mapstorage).coords[i].y-20,

         (mytab.mapstorage).coords[i].x+20,

         (mytab.mapstorage).coords[i].y+20);

     *(nodesmap[i]) << Gnome::Canvas::Properties::fill_color("blue");

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

     nodesmap[i]->raise_to_top();

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

     XY text_pos(

         ((mytab.mapstorage).coords[i].x+node_property_defaults[N_RADIUS]+5),

         ((mytab.mapstorage).coords[i].y+node_property_defaults[N_RADIUS]+5));

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

         text_pos.x, text_pos.y, "");

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

     nodetextmap[i]->signal_event().connect(sigc::mem_fun(*this, &GraphDisplayerCanvas::mapEditEventHandler), false);

     nodetextmap[i]->raise_to_top();

   }

   is_drawn=true;

   //upon drawing graph

   //properties have to

   //be set in as well

   for(int i=0;i<NODE_PROPERTY_NUM;i++)

     {

       propertyUpdate(Node(INVALID), i);

     }

   for(int i=0;i<EDGE_PROPERTY_NUM;i++)

     {

       propertyUpdate(Edge(INVALID), i);

     }

   updateScrollRegion();

 }

 void GraphDisplayerCanvas::clear()

 {

   active_node=INVALID;

   active_edge=INVALID;

   forming_edge=INVALID;

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

   {

     delete nodesmap[n];

     delete nodetextmap[n];

   }

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

   {

     delete edgesmap[e];

     delete edgetextmap[e];

   }

   is_drawn=false;

 }

 void GraphDisplayerCanvas::setView(bool autoscale_p, bool zoomtrack_p, double width_p, double radius_p)

 {

   autoscale=autoscale_p;

   edge_width=width_p;

   radius_size=radius_p;

   if((!zoomtrack) && zoomtrack_p)

     {

       fixed_zoom_factor=get_pixels_per_unit();

     }

   zoomtrack=zoomtrack_p;

   propertyChange(false, N_RADIUS);

   propertyChange(true, E_WIDTH);

 }

 void GraphDisplayerCanvas::getView(bool & autoscale_p, bool & zoomtrack_p, double& width_p, double& radius_p)

 {

   autoscale_p=autoscale;

   zoomtrack_p=zoomtrack;

   width_p=edge_width;

   radius_p=radius_size;

 }

 void GraphDisplayerCanvas::reDesignGraph()

 {

   double min_dist=20;

   double init_vector_length=25;

   if(!was_redesigned)

     {

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

       dim2::Point<double> init(init_vector_length*rnd(),

 			       init_vector_length*rnd());

       moveNode(init.x, init.y, nodesmap[i], i);

       was_redesigned=true;

     }

   double attraction;

   double propulsation;

   int iterations;

   (mytab.mapstorage).get_design_data(attraction, propulsation, iterations);

   //iteration counter

   for(int l=0;l<iterations;l++)

     {

       Graph::NodeMap<double> x(mytab.mapstorage.graph);

       Graph::NodeMap<double> y(mytab.mapstorage.graph);

       XYMap<Graph::NodeMap<double> > actual_forces;

       actual_forces.setXMap(x);

       actual_forces.setYMap(y);

       //count actual force for each nodes

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

 	{

 	  //propulsation of nodes

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

 	    {

 	      if(i!=j)

 		{

 		  lemon::dim2::Point<double> delta =

 		    ((mytab.mapstorage).coords[i]-

 		     (mytab.mapstorage).coords[j]);

 		  const double length_sqr=std::max(delta.normSquare(),min_dist);

 		  //normalize vector

 		  delta/=sqrt(length_sqr);

 		  //calculating propulsation strength

 		  //greater distance menas smaller propulsation strength

 		  delta*=propulsation/length_sqr;

 		  actual_forces.set(i,(actual_forces[i]+delta));

 		}

 	    }

 	  //attraction of nodes, to which actual node is bound

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

 	    {

 	      lemon::dim2::Point<double> delta =

 		((mytab.mapstorage).coords[i]-

 		 (mytab.mapstorage).coords[mytab.mapstorage.

 					   graph.target(ei)]);

 		//calculating attraction strength

 		//greater distance means greater strength

 		delta*=attraction;

 		actual_forces.set(i,actual_forces[i]-delta);

 	    }

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

 	    {

 	      lemon::dim2::Point<double> delta =

 		((mytab.mapstorage).coords[i]-

 		 (mytab.mapstorage).coords[mytab.mapstorage.

 					   graph.source(ei)]);

 		//calculating attraction strength

 		//greater distance means greater strength

 		delta*=attraction;

 		actual_forces.set(i,actual_forces[i]-delta);

 	    }

 	}

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

 	{

 	  moveNode(actual_forces[i].x, actual_forces[i].y, nodesmap[i], i);

 	}

     }

 }