287 lines
8.8 KiB
C++
287 lines
8.8 KiB
C++
//=======================================================================
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// Copyright 2007 Aaron Windsor
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//
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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//=======================================================================
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/*
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This test looks in the directory "planar_input_graphs" for any files
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of the form *.dimacs. Each such file is used to create an input graph
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and test the input graph for planarity. If the graph is planar, a
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straight line drawing is generated and verified. If the graph isn't
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planar, a kuratowski subgraph is isolated and verified.
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This test needs to be linked against Boost.Filesystem.
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*/
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#define BOOST_FILESYSTEM_VERSION 3
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#include <iostream>
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#include <fstream>
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#include <vector>
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#include <string>
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#include <utility>
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#include <boost/property_map/property_map.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/tuple/tuple.hpp>
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#include <boost/filesystem.hpp>
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#include <boost/algorithm/string.hpp>
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#include <boost/test/minimal.hpp>
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#include <boost/graph/adjacency_list.hpp>
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#include <boost/graph/depth_first_search.hpp>
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#include <boost/graph/properties.hpp>
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#include <boost/graph/graph_traits.hpp>
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#include <boost/graph/planar_canonical_ordering.hpp>
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#include <boost/graph/make_connected.hpp>
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#include <boost/graph/make_biconnected_planar.hpp>
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#include <boost/graph/make_maximal_planar.hpp>
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#include <boost/graph/is_straight_line_drawing.hpp>
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#include <boost/graph/is_kuratowski_subgraph.hpp>
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#include <boost/graph/chrobak_payne_drawing.hpp>
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#include <boost/graph/boyer_myrvold_planar_test.hpp>
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#include <boost/graph/planar_detail/add_edge_visitors.hpp>
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using namespace boost;
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struct coord_t
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{
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std::size_t x;
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std::size_t y;
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};
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template <typename Graph>
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void read_dimacs(Graph& g, const std::string& filename)
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{
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typedef typename graph_traits<Graph>::vertex_descriptor vertex_t;
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std::vector<vertex_t> vertices_by_index;
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std::ifstream in(filename.c_str());
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while (!in.eof())
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{
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char buffer[256];
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in.getline(buffer, 256);
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std::string s(buffer);
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if (s.size() == 0)
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continue;
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std::vector<std::string> v;
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split(v, buffer, is_any_of(" \t\n"));
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if (v[0] == "p")
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{
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//v[1] == "edge"
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g = Graph(boost::lexical_cast<std::size_t>(v[2].c_str()));
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std::copy(vertices(g).first,
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vertices(g).second,
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std::back_inserter(vertices_by_index)
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);
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}
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else if (v[0] == "e")
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{
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add_edge(vertices_by_index
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[boost::lexical_cast<std::size_t>(v[1].c_str())],
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vertices_by_index
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[boost::lexical_cast<std::size_t>(v[2].c_str())],
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g);
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}
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}
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}
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int test_graph(const std::string& dimacs_filename)
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{
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typedef adjacency_list<listS,
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vecS,
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undirectedS,
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property<vertex_index_t, int>,
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property<edge_index_t, int> > graph;
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typedef graph_traits<graph>::edge_descriptor edge_t;
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typedef graph_traits<graph>::edge_iterator edge_iterator_t;
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typedef graph_traits<graph>::vertex_iterator vertex_iterator_t;
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typedef graph_traits<graph>::edges_size_type e_size_t;
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typedef graph_traits<graph>::vertex_descriptor vertex_t;
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typedef edge_index_update_visitor<property_map<graph, edge_index_t>::type>
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edge_visitor_t;
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vertex_iterator_t vi, vi_end;
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edge_iterator_t ei, ei_end;
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graph g;
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read_dimacs(g, dimacs_filename);
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// Initialize the interior edge index
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property_map<graph, edge_index_t>::type e_index = get(edge_index, g);
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e_size_t edge_count = 0;
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for(boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei)
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put(e_index, *ei, edge_count++);
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// Initialize the interior vertex index - not needed if the vertices
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// are stored with a vecS
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/*
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property_map<graph, vertex_index_t>::type v_index = get(vertex_index, g);
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v_size_t vertex_count = 0;
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for(boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
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put(v_index, *vi, vertex_count++);
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*/
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// This edge_updater will automatically update the interior edge
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// index of the graph as edges are created.
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edge_visitor_t edge_updater(get(edge_index, g), num_edges(g));
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// The input graph may not be maximal planar, but the Chrobak-Payne straight
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// line drawing needs a maximal planar graph as input. So, we make a copy of
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// the original graph here, then add edges to the graph to make it maximal
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// planar. When we're done creating a drawing of the maximal planar graph,
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// we can use the same mapping of vertices to points on the grid to embed the
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// original, non-maximal graph.
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graph g_copy(g);
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// Add edges to make g connected, if it isn't already
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make_connected(g, get(vertex_index, g), edge_updater);
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std::vector<graph_traits<graph>::edge_descriptor> kuratowski_edges;
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typedef std::vector< std::vector<edge_t> > edge_permutation_storage_t;
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typedef boost::iterator_property_map
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< edge_permutation_storage_t::iterator,
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property_map<graph, vertex_index_t>::type
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>
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edge_permutation_t;
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edge_permutation_storage_t edge_permutation_storage(num_vertices(g));
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edge_permutation_t perm(edge_permutation_storage.begin(),
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get(vertex_index,g)
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);
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// Test for planarity, computing the planar embedding or the kuratowski
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// subgraph.
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if (!boyer_myrvold_planarity_test(boyer_myrvold_params::graph = g,
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boyer_myrvold_params::embedding = perm,
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boyer_myrvold_params::kuratowski_subgraph
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= std::back_inserter(kuratowski_edges)
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)
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)
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{
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std::cout << "Not planar. ";
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BOOST_REQUIRE(is_kuratowski_subgraph(g,
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kuratowski_edges.begin(),
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kuratowski_edges.end()
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)
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);
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return 0;
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}
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// If we get this far, we have a connected planar graph.
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make_biconnected_planar(g, perm, get(edge_index, g), edge_updater);
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// Compute the planar embedding of the (now) biconnected planar graph
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BOOST_CHECK (boyer_myrvold_planarity_test(boyer_myrvold_params::graph = g,
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boyer_myrvold_params::embedding =
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perm
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)
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);
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// If we get this far, we have a biconnected planar graph
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make_maximal_planar(g, perm, get(vertex_index,g), get(edge_index,g),
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edge_updater
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);
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// Now the graph is triangulated - we can compute the final planar embedding
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BOOST_CHECK (boyer_myrvold_planarity_test(boyer_myrvold_params::graph = g,
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boyer_myrvold_params::embedding =
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perm
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)
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);
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// Compute a planar canonical ordering of the vertices
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std::vector<vertex_t> ordering;
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planar_canonical_ordering(g, perm, std::back_inserter(ordering));
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BOOST_CHECK(ordering.size() == num_vertices(g));
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typedef std::vector< coord_t > drawing_storage_t;
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typedef boost::iterator_property_map
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< drawing_storage_t::iterator, property_map<graph, vertex_index_t>::type >
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drawing_map_t;
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drawing_storage_t drawing_vector(num_vertices(g));
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drawing_map_t drawing(drawing_vector.begin(), get(vertex_index,g));
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// Compute a straight line drawing
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chrobak_payne_straight_line_drawing(g,
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perm,
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ordering.begin(),
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ordering.end(),
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drawing
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);
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std::cout << "Planar. ";
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BOOST_REQUIRE (is_straight_line_drawing(g, drawing));
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return 0;
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}
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int test_main(int argc, char* argv[])
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{
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std::string input_directory_str = "planar_input_graphs";
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if (argc > 1)
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{
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input_directory_str = std::string(argv[1]);
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}
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std::cout << "Reading planar input files from " << input_directory_str
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<< std::endl;
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filesystem::path input_directory =
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filesystem::system_complete(filesystem::path(input_directory_str));
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const std::string dimacs_extension = ".dimacs";
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filesystem::directory_iterator dir_end;
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for( filesystem::directory_iterator dir_itr(input_directory);
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dir_itr != dir_end; ++dir_itr)
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{
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if (dir_itr->path().extension() != dimacs_extension)
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continue;
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std::cout << "Testing " << dir_itr->path().leaf() << "... ";
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BOOST_REQUIRE (test_graph(dir_itr->path().string()) == 0);
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std::cout << std::endl;
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}
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return 0;
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}
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