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Diffstat (limited to 'src/boost/libs/graph/example/kuratowski_subgraph.cpp')
-rw-r--r-- | src/boost/libs/graph/example/kuratowski_subgraph.cpp | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/src/boost/libs/graph/example/kuratowski_subgraph.cpp b/src/boost/libs/graph/example/kuratowski_subgraph.cpp new file mode 100644 index 00000000..8f55a3e6 --- /dev/null +++ b/src/boost/libs/graph/example/kuratowski_subgraph.cpp @@ -0,0 +1,96 @@ +//======================================================================= +// 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/boyer_myrvold_planar_test.hpp> +#include <boost/graph/is_kuratowski_subgraph.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; + + // Create a K_6 (complete graph on 6 vertices), which + // contains both Kuratowski subgraphs as minors. + graph g(6); + add_edge(0,1,g); + add_edge(0,2,g); + add_edge(0,3,g); + add_edge(0,4,g); + add_edge(0,5,g); + add_edge(1,2,g); + add_edge(1,3,g); + add_edge(1,4,g); + add_edge(1,5,g); + add_edge(2,3,g); + add_edge(2,4,g); + add_edge(2,5,g); + add_edge(3,4,g); + add_edge(3,5,g); + add_edge(4,5,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 not planar, we just want to + // compute the kuratowski subgraph as a side-effect + typedef std::vector< graph_traits<graph>::edge_descriptor > + kuratowski_edges_t; + kuratowski_edges_t kuratowski_edges; + if (boyer_myrvold_planarity_test(boyer_myrvold_params::graph = g, + boyer_myrvold_params::kuratowski_subgraph = + std::back_inserter(kuratowski_edges) + ) + ) + std::cout << "Input graph is planar" << std::endl; + else + { + std::cout << "Input graph is not planar" << std::endl; + + std::cout << "Edges in the Kuratowski subgraph: "; + kuratowski_edges_t::iterator ki, ki_end; + ki_end = kuratowski_edges.end(); + for(ki = kuratowski_edges.begin(); ki != ki_end; ++ki) + { + std::cout << *ki << " "; + } + std::cout << std::endl; + + std::cout << "Is a kuratowski subgraph? "; + if (is_kuratowski_subgraph + (g, kuratowski_edges.begin(), kuratowski_edges.end()) + ) + std::cout << "Yes." << std::endl; + else + std::cout << "No." << std::endl; + } + + return 0; +} |