/* -*- C++ -*-

 *

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

 *

 * Copyright (C) 2003-2008

 * 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.

 *

 */

///\ingroup demos

///\file

///\brief Calculating an approximate Steiner-tree.

///

/// Calculating an approximate Steiner-tree.

///

/// \include steiner_demo.cc

#include <lemon/smart_graph.h>

#include <lemon/kruskal.h>

#include <lemon/graph_reader.h>

#include <lemon/time_measure.h>

#include <lemon/graph_to_eps.h>

#include <lemon/steiner.h>

#include <lemon/math.h>

#include <cstdlib>

using namespace lemon;

using namespace lemon::dim2;

using namespace std;

int main(int argc, const char *argv[]) {

  std::string lgf = argc > 1 ? argv[1] : "steiner.lgf";

  std::string eps = argc > 2 ? argv[2] : "steiner.eps";

  SmartUGraph graph;

  SmartUGraph::NodeMap<bool> terminal(graph);

  SmartUGraph::NodeMap<int> label(graph);

  SmartUGraph::NodeMap<Point<double> > coord(graph);

  UGraphReader<SmartUGraph>(lgf, graph).

    readNodeMap("coordinates_x", xMap(coord)).

    readNodeMap("coordinates_y", yMap(coord)).

    readNodeMap("terminal", terminal).run();

  SmartUGraph::UEdgeMap<double> cost(graph);

  for (SmartUGraph::UEdgeIt it(graph); it != INVALID; ++it) {

    cost[it] = sqrt((coord[graph.target(it)] - 

                     coord[graph.source(it)]).normSquare());

  }

  SteinerTree<SmartUGraph> steiner(graph, cost);

  steiner.init();

  for (SmartUGraph::NodeIt it(graph); it != INVALID; ++it) {

    if (terminal[it]) {

      steiner.addTerminal(it);

    }

  }

  steiner.start();

  Palette nodepalette(0);

  nodepalette.add(Color(1.0, 1.0, 1.0));

  nodepalette.add(Color(0.0, 1.0, 0.0));

  nodepalette.add(Color(0.5, 0.5, 0.5));

  SmartUGraph::NodeMap<int> nodecolor(graph);

  for (SmartUGraph::NodeIt it(graph); it != INVALID; ++it) {

    if (steiner.terminal(it)) {

      nodecolor[it] = 1;

    } else if (steiner.steiner(it)) {

      nodecolor[it] = 2;

    } else {

      nodecolor[it] = 0;

    }

  }

  Palette edgepalette(0);

  edgepalette.add(Color(0.0, 0.0, 0.0));

  edgepalette.add(Color(1.0, 0.0, 0.0));

  SmartUGraph::UEdgeMap<int> edgecolor(graph);

  for (SmartUGraph::UEdgeIt it(graph); it != INVALID; ++it) {

    edgecolor[it] = steiner.tree(it) ? 1 : 0;

  }

  graphToEps(graph, eps).

    coords(coord).undirected().

    nodeScale(1.0).scaleToA4().

    nodeColors(composeMap(nodepalette, nodecolor)).

    edgeColors(composeMap(edgepalette, edgecolor)).

    nodeTexts(label).nodeTextSize(8).run();

  std::cout << "The tree constructed: " << eps << std::endl;

  std::cout << "The cost of the tree: " << steiner.treeValue() << std::endl;

  return 0;

}