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93 lines
3.1 KiB
C++
93 lines
3.1 KiB
C++
// Copyright 2010 The Trustees of Indiana University.
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// Distributed under the Boost Software License, Version 1.0.
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// (See 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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// Authors: Jeremiah Willcock
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// Andrew Lumsdaine
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#include <boost/graph/random_spanning_tree.hpp>
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#include <boost/graph/grid_graph.hpp>
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#include <boost/array.hpp>
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#include <boost/random.hpp>
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#include <boost/property_map/shared_array_property_map.hpp>
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#include <boost/property_map/dynamic_property_map.hpp>
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#include <boost/graph/graphviz.hpp>
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#include <boost/lexical_cast.hpp>
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#include <boost/graph/property_maps/constant_property_map.hpp>
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#include <string>
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#include <iostream>
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#include <fstream>
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#include <boost/graph/iteration_macros.hpp>
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using namespace boost;
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using namespace std;
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typedef grid_graph< 2 > graph_type;
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typedef graph_traits< graph_type > gt;
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template < typename Graph, typename PredMap, typename WeightMap >
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void write_spanning_tree(
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const Graph& g, PredMap pred, WeightMap weight, string filename)
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{
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shared_array_property_map< string,
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typename property_map< Graph, edge_index_t >::const_type >
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edge_style(num_edges(g), get(edge_index, g));
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shared_array_property_map< string,
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typename property_map< Graph, vertex_index_t >::const_type >
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vertex_pos(num_vertices(g), get(vertex_index, g));
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BGL_FORALL_EDGES_T(e, g, Graph)
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{
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put(edge_style, e,
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(get(pred, target(e, g)) == source(e, g)
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|| get(pred, source(e, g)) == target(e, g))
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? "bold"
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: "dotted");
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}
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BGL_FORALL_VERTICES_T(v, g, Graph)
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{
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put(vertex_pos, v,
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lexical_cast< string >(v[0]) + "," + lexical_cast< string >(v[1]));
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}
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dynamic_properties dp;
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dp.property("style", edge_style);
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dp.property("pos", vertex_pos);
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dp.property("len", weight);
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dp.property("node_id", get(vertex_index, g));
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ofstream out(filename.c_str());
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write_graphviz_dp(out, g, dp);
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}
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int main(int, char**)
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{
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boost::array< size_t, 2 > sizes = { { 5, 5 } };
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graph_type g(sizes);
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shared_array_property_map< gt::vertex_descriptor,
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property_map< graph_type, vertex_index_t >::const_type >
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pred(num_vertices(g), get(vertex_index, g));
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shared_array_property_map< double,
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property_map< graph_type, edge_index_t >::const_type >
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weight(num_edges(g), get(edge_index, g));
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BGL_FORALL_EDGES(e, g, graph_type)
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{
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put(weight, e, (1. + get(edge_index, g, e)) / num_edges(g));
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}
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boost::mt19937 gen;
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random_spanning_tree(g, gen, predecessor_map(pred));
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// write_spanning_tree(g, pred, constant_property_map<gt::edge_descriptor,
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// double>(1.), "unweight_random_st.dot");
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random_spanning_tree(g, gen, predecessor_map(pred));
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// write_spanning_tree(g, pred, constant_property_map<gt::edge_descriptor,
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// double>(1.), "unweight_random_st2.dot");
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random_spanning_tree(g, gen, predecessor_map(pred).weight_map(weight));
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// write_spanning_tree(g, pred, weight, "weight_random_st.dot");
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return 0;
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}
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