/* -*- 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);

	}

    }

}