| //======================================================================= |
| // 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 <boost/lexical_cast.hpp> |
| #include <boost/graph/graphviz.hpp> |
| #include <boost/graph/kruskal_min_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 (boost::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); |
| } |
| |
| std::vector < graph_traits < Graph >::edge_descriptor > mst; |
| typedef std::vector < graph_traits < Graph >::edge_descriptor >::size_type size_type; |
| kruskal_minimum_spanning_tree(g, std::back_inserter(mst)); |
| |
| property_map < Graph, edge_weight_t >::type weight = get(edge_weight, g); |
| int total_weight = 0; |
| for (size_type e = 0; e < mst.size(); ++e) |
| total_weight += get(weight, mst[e]); |
| std::cout << "total weight: " << total_weight << std::endl; |
| |
| typedef graph_traits < Graph >::vertex_descriptor Vertex; |
| for (size_type i = 0; i < mst.size(); ++i) { |
| Vertex u = source(mst[i], g), v = target(mst[i], g); |
| edge_attr_map[edge(u, v, g_dot).first]["color"] = "black"; |
| } |
| std::ofstream out("figs/telephone-mst-kruskal.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"; |
| graph_edge_attr_map["style"] = "bold"; |
| write_graphviz(out, g_dot); |
| |
| return EXIT_SUCCESS; |
| } |