111 lines
3.9 KiB
C++
111 lines
3.9 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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#include <iostream>
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#include <boost/graph/adjacency_list.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/property_map/property_map.hpp>
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#include <vector>
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#include <boost/graph/planar_canonical_ordering.hpp>
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#include <boost/graph/is_straight_line_drawing.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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using namespace boost;
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// a class to hold the coordinates of the straight line embedding
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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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int main(int argc, char** argv)
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{
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typedef adjacency_list< vecS, vecS, undirectedS,
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property< vertex_index_t, int > >
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graph;
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// Define the storage type for the planar embedding
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typedef std::vector< std::vector< graph_traits< graph >::edge_descriptor > >
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embedding_storage_t;
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typedef boost::iterator_property_map< embedding_storage_t::iterator,
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property_map< graph, vertex_index_t >::type >
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embedding_t;
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// Create the graph - a maximal planar graph on 7 vertices. The functions
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// planar_canonical_ordering and chrobak_payne_straight_line_drawing both
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// require a maximal planar graph. If you start with a graph that isn't
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// maximal planar (or you're not sure), you can use the functions
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// make_connected, make_biconnected_planar, and make_maximal planar in
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// sequence to add a set of edges to any undirected planar graph to make
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// it maximal planar.
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graph g(7);
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add_edge(0, 1, g);
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add_edge(1, 2, g);
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add_edge(2, 3, g);
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add_edge(3, 0, g);
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add_edge(3, 4, g);
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add_edge(4, 5, g);
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add_edge(5, 6, g);
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add_edge(6, 3, g);
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add_edge(0, 4, g);
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add_edge(1, 3, g);
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add_edge(3, 5, g);
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add_edge(2, 6, g);
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add_edge(1, 4, g);
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add_edge(1, 5, g);
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add_edge(1, 6, g);
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// Create the planar embedding
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embedding_storage_t embedding_storage(num_vertices(g));
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embedding_t embedding(embedding_storage.begin(), get(vertex_index, g));
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boyer_myrvold_planarity_test(boyer_myrvold_params::graph = g,
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boyer_myrvold_params::embedding = embedding);
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// Find a canonical ordering
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std::vector< graph_traits< graph >::vertex_descriptor > ordering;
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planar_canonical_ordering(g, embedding, std::back_inserter(ordering));
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// Set up a property map to hold the mapping from vertices to coord_t's
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typedef std::vector< coord_t > straight_line_drawing_storage_t;
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typedef boost::iterator_property_map<
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straight_line_drawing_storage_t::iterator,
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property_map< graph, vertex_index_t >::type >
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straight_line_drawing_t;
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straight_line_drawing_storage_t straight_line_drawing_storage(
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num_vertices(g));
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straight_line_drawing_t straight_line_drawing(
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straight_line_drawing_storage.begin(), get(vertex_index, g));
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// Compute the straight line drawing
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chrobak_payne_straight_line_drawing(
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g, embedding, ordering.begin(), ordering.end(), straight_line_drawing);
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std::cout << "The straight line drawing is: " << std::endl;
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graph_traits< graph >::vertex_iterator vi, vi_end;
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for (boost::tie(vi, vi_end) = vertices(g); vi != vi_end; ++vi)
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{
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coord_t coord(get(straight_line_drawing, *vi));
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std::cout << *vi << " -> (" << coord.x << ", " << coord.y << ")"
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<< std::endl;
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}
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// Verify that the drawing is actually a plane drawing
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if (is_straight_line_drawing(g, straight_line_drawing))
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std::cout << "Is a plane drawing." << std::endl;
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else
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std::cout << "Is not a plane drawing." << std::endl;
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return 0;
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}
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