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