int numberOfConnectedComponents(Graph *G)
{
typedef std::map<graph_traits<MyGraphType>::vertex_descriptor, graph_traits<MyGraphType>::vertices_size_type> component_type;
component_type component;
boost::associative_property_map< component_type > component_map(component);
int num_components = connected_components(*G, component_map);
return num_components;
}
void make_biconnected_planar(Graph& g,
PlanarEmbedding embedding,
EdgeIndexMap em,
AddEdgeVisitor& vis
)
{
typedef typename graph_traits<Graph>::vertex_descriptor vertex_t;
typedef typename graph_traits<Graph>::edge_descriptor edge_t;
typedef typename graph_traits<Graph>::edges_size_type edge_size_t;
typedef typename
property_traits<PlanarEmbedding>::value_type embedding_value_t;
typedef typename embedding_value_t::const_iterator embedding_iterator_t;
typedef iterator_property_map
<std::vector<std::size_t>::iterator, EdgeIndexMap> component_map_t;
edge_size_t n_edges(num_edges(g));
std::vector<vertex_t> articulation_points;
std::vector<edge_size_t> component_vector(n_edges);
component_map_t component_map(component_vector.begin(), em);
biconnected_components(g, component_map,
std::back_inserter(articulation_points));
typename std::vector<vertex_t>::iterator ap, ap_end;
ap_end = articulation_points.end();
for(ap = articulation_points.begin(); ap != ap_end; ++ap)
{
vertex_t v(*ap);
embedding_iterator_t pi = embedding[v].begin();
embedding_iterator_t pi_end = embedding[v].end();
edge_size_t previous_component(n_edges + 1);
vertex_t previous_vertex = graph_traits<Graph>::null_vertex();
for(; pi != pi_end; ++pi)
{
edge_t e(*pi);
vertex_t e_source(source(e,g));
vertex_t e_target(target(e,g));
//Skip self-loops and parallel edges
if (e_source == e_target || previous_vertex == e_target)
continue;
vertex_t current_vertex = e_source == v ? e_target : e_source;
edge_size_t current_component = component_map[e];
if (previous_vertex != graph_traits<Graph>::null_vertex() &&
current_component != previous_component)
{
vis.visit_vertex_pair(current_vertex, previous_vertex, g);
}
previous_vertex = current_vertex;
previous_component = current_component;
}
}
}
