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+//=======================================================================
+// 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/planar_face_traversal.hpp>
+#include <boost/graph/boyer_myrvold_planar_test.hpp>
+
+using namespace boost;
+
+// Some planar face traversal visitors that will
+// print the vertices and edges on the faces
+
+struct output_visitor : public planar_face_traversal_visitor
+{
+ void begin_face() { std::cout << "New face: "; }
+ void end_face() { std::cout << std::endl; }
+};
+
+struct vertex_output_visitor : public output_visitor
+{
+ template < typename Vertex > void next_vertex(Vertex v)
+ {
+ std::cout << v << " ";
+ }
+};
+
+struct edge_output_visitor : public output_visitor
+{
+ template < typename Edge > void next_edge(Edge e) { std::cout << e << " "; }
+};
+
+int main(int argc, char** argv)
+{
+
+ typedef adjacency_list< vecS, vecS, undirectedS,
+ property< vertex_index_t, int >, property< edge_index_t, int > >
+ graph;
+
+ // Create a graph - this is a biconnected, 3 x 3 grid.
+ // It should have four small (four vertex/four edge) faces and
+ // one large face that contains all but the interior vertex
+ graph g(9);
+
+ add_edge(0, 1, g);
+ add_edge(1, 2, g);
+
+ add_edge(3, 4, g);
+ add_edge(4, 5, g);
+
+ add_edge(6, 7, g);
+ add_edge(7, 8, g);
+
+ add_edge(0, 3, g);
+ add_edge(3, 6, g);
+
+ add_edge(1, 4, g);
+ add_edge(4, 7, g);
+
+ add_edge(2, 5, g);
+ add_edge(5, 8, 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 - we know it is planar, we just want to
+ // 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;
+
+ std::cout << std::endl << "Vertices on the faces: " << std::endl;
+ vertex_output_visitor v_vis;
+ planar_face_traversal(g, &embedding[0], v_vis);
+
+ std::cout << std::endl << "Edges on the faces: " << std::endl;
+ edge_output_visitor e_vis;
+ planar_face_traversal(g, &embedding[0], e_vis);
+
+ return 0;
+}