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//=======================================================================
// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#include <boost/config.hpp>
#include <iostream>
#include <fstream>
#include <vector>
#include <boost/lexical_cast.hpp>
#include <boost/graph/graphviz.hpp>
#include <boost/graph/prim_minimum_spanning_tree.hpp>
int
main()
{
using namespace boost;
GraphvizGraph g_dot;
read_graphviz("figs/telephone-network.dot", g_dot);
typedef adjacency_list < vecS, vecS, undirectedS, no_property,
property < edge_weight_t, int > > Graph;
Graph g(num_vertices(g_dot));
property_map < GraphvizGraph, edge_attribute_t >::type
edge_attr_map = get(edge_attribute, g_dot);
graph_traits < GraphvizGraph >::edge_iterator ei, ei_end;
for (tie(ei, ei_end) = edges(g_dot); ei != ei_end; ++ei) {
int weight = lexical_cast < int >(edge_attr_map[*ei]["label"]);
property < edge_weight_t, int >edge_property(weight);
add_edge(source(*ei, g_dot), target(*ei, g_dot), edge_property, g);
}
typedef graph_traits < Graph >::vertex_descriptor Vertex;
std::vector < Vertex > parent(num_vertices(g));
property_map < Graph, edge_weight_t >::type weight = get(edge_weight, g);
#if defined(BOOST_MSVC) && BOOST_MSVC <= 1300
property_map<Graph, vertex_index_t>::type indexmap = get(vertex_index, g);
std::vector<std::size_t> distance(num_vertices(g));
prim_minimum_spanning_tree(g, *vertices(g).first, &parent[0], &distance[0],
weight, indexmap, default_dijkstra_visitor());
#else
prim_minimum_spanning_tree(g, &parent[0]);
#endif
int total_weight = 0;
for (int v = 0; v < num_vertices(g); ++v)
if (parent[v] != v)
total_weight += get(weight, edge(parent[v], v, g).first);
std::cout << "total weight: " << total_weight << std::endl;
for (int u = 0; u < num_vertices(g); ++u)
if (parent[u] != u)
edge_attr_map[edge(parent[u], u, g_dot).first]["color"] = "black";
std::ofstream out("figs/telephone-mst-prim.dot");
graph_property < GraphvizGraph, graph_edge_attribute_t >::type &
graph_edge_attr_map = get_property(g_dot, graph_edge_attribute);
graph_edge_attr_map["color"] = "gray";
write_graphviz(out, g_dot);
return EXIT_SUCCESS;
}
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