Boost C++ Libraries

libs/graph/example/make_biconnected_planar.cpp

//=======================================================================
// Copyright 2007 Aaron Windsor
//
// 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 <iostream>
#include <boost/graph/adjacency_list.hpp>
#include <boost/graph/properties.hpp>
#include <boost/graph/graph_traits.hpp>
#include <boost/property_map/property_map.hpp>
#include <boost/ref.hpp>
#include <vector>

#include <boost/graph/biconnected_components.hpp>
#include <boost/graph/make_biconnected_planar.hpp>
#include <boost/graph/boyer_myrvold_planar_test.hpp>

using namespace boost;

int main(int argc, char** argv)
{

    typedef adjacency_list< vecS, vecS, undirectedS,
        property< vertex_index_t, int >, property< edge_index_t, int > >
        graph;

    graph g(11);
    add_edge(0, 1, g);
    add_edge(2, 3, g);
    add_edge(3, 0, g);
    add_edge(3, 4, g);
    add_edge(4, 5, g);
    add_edge(5, 3, g);
    add_edge(5, 6, g);
    add_edge(6, 7, g);
    add_edge(7, 8, g);
    add_edge(8, 5, g);
    add_edge(8, 9, g);
    add_edge(0, 10, g);

    // Initialize the interior edge index
    property_map< graph, edge_index_t >::type e_index = get(edge_index, g);
    graph_traits< graph >::edges_size_type edge_count = 0;
    graph_traits< graph >::edge_iterator ei, ei_end;
    for (boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei)
        put(e_index, *ei, edge_count++);

    // Test for planarity; compute the planar embedding as a side-effect
    typedef std::vector< graph_traits< graph >::edge_descriptor > vec_t;
    std::vector< vec_t > embedding(num_vertices(g));
    if (boyer_myrvold_planarity_test(boyer_myrvold_params::graph = g,
            boyer_myrvold_params::embedding = &embedding[0]))
        std::cout << "Input graph is planar" << std::endl;
    else
        std::cout << "Input graph is not planar" << std::endl;

    typedef std::vector< graph_traits< graph >::edges_size_type >
        component_storage_t;
    typedef iterator_property_map< component_storage_t::iterator,
        property_map< graph, edge_index_t >::type >
        component_map_t;

    component_storage_t component_storage(num_edges(g));
    component_map_t component(component_storage.begin(), get(edge_index, g));

    std::cout << "Before calling make_biconnected_planar, the graph has "
              << biconnected_components(g, component)
              << " biconnected components" << std::endl;

    make_biconnected_planar(g, &embedding[0]);

    // Re-initialize the edge index, since we just added a few edges
    edge_count = 0;
    for (boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei)
        put(e_index, *ei, edge_count++);

    // Re-size the storage for the biconnected components, since we
    // just added a few edges

    component_storage.resize(num_edges(g));
    component = component_map_t(component_storage.begin(), get(edge_index, g));

    std::cout << "After calling make_biconnected_planar, the graph has "
              << biconnected_components(g, component)
              << " biconnected components" << std::endl;

    if (boyer_myrvold_planarity_test(g))
        std::cout << "Also, the graph is still planar." << std::endl;
    else
        std::cout << "But the graph is not still planar." << std::endl;

    return 0;
}