104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
|
//=======================================================================
|
||
|
|
// Copyright 2001 Jeremy G. Siek, Andrew Lumsdaine, Lie-Quan Lee,
|
||
|
|
//
|
||
|
|
// 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 <boost/config.hpp>
|
||
|
|
#include <iostream>
|
||
|
|
#include <fstream>
|
||
|
|
|
||
|
|
#include <boost/graph/graph_traits.hpp>
|
||
|
|
#include <boost/graph/adjacency_list.hpp>
|
||
|
|
#include <boost/graph/dijkstra_shortest_paths.hpp>
|
||
|
|
|
||
|
|
using namespace boost;
|
||
|
|
|
||
|
|
int main(int, char*[])
|
||
|
|
{
|
||
|
|
typedef adjacency_list_traits< listS, listS, directedS >::vertex_descriptor
|
||
|
|
vertex_descriptor;
|
||
|
|
typedef adjacency_list< listS, listS, directedS,
|
||
|
|
property< vertex_index_t, int,
|
||
|
|
property< vertex_name_t, char,
|
||
|
|
property< vertex_distance_t, int,
|
||
|
|
property< vertex_predecessor_t, vertex_descriptor > > > >,
|
||
|
|
property< edge_weight_t, int > >
|
||
|
|
graph_t;
|
||
|
|
typedef std::pair< int, int > Edge;
|
||
|
|
|
||
|
|
const int num_nodes = 5;
|
||
|
|
enum nodes
|
||
|
|
{
|
||
|
|
A,
|
||
|
|
B,
|
||
|
|
C,
|
||
|
|
D,
|
||
|
|
E
|
||
|
|
};
|
||
|
|
Edge edge_array[] = { Edge(A, C), Edge(B, B), Edge(B, D), Edge(B, E),
|
||
|
|
Edge(C, B), Edge(C, D), Edge(D, E), Edge(E, A), Edge(E, B) };
|
||
|
|
int weights[] = { 1, 2, 1, 2, 7, 3, 1, 1, 1 };
|
||
|
|
int num_arcs = sizeof(edge_array) / sizeof(Edge);
|
||
|
|
graph_traits< graph_t >::vertex_iterator i, iend;
|
||
|
|
|
||
|
|
graph_t g(edge_array, edge_array + num_arcs, weights, num_nodes);
|
||
|
|
property_map< graph_t, edge_weight_t >::type weightmap
|
||
|
|
= get(edge_weight, g);
|
||
|
|
|
||
|
|
// Manually intialize the vertex index and name maps
|
||
|
|
property_map< graph_t, vertex_index_t >::type indexmap
|
||
|
|
= get(vertex_index, g);
|
||
|
|
property_map< graph_t, vertex_name_t >::type name = get(vertex_name, g);
|
||
|
|
int c = 0;
|
||
|
|
for (boost::tie(i, iend) = vertices(g); i != iend; ++i, ++c)
|
||
|
|
{
|
||
|
|
indexmap[*i] = c;
|
||
|
|
name[*i] = 'A' + c;
|
||
|
|
}
|
||
|
|
|
||
|
|
vertex_descriptor s = vertex(A, g);
|
||
|
|
|
||
|
|
property_map< graph_t, vertex_distance_t >::type d
|
||
|
|
= get(vertex_distance, g);
|
||
|
|
property_map< graph_t, vertex_predecessor_t >::type p
|
||
|
|
= get(vertex_predecessor, g);
|
||
|
|
dijkstra_shortest_paths(g, s, predecessor_map(p).distance_map(d));
|
||
|
|
|
||
|
|
std::cout << "distances and parents:" << std::endl;
|
||
|
|
graph_traits< graph_t >::vertex_iterator vi, vend;
|
||
|
|
for (boost::tie(vi, vend) = vertices(g); vi != vend; ++vi)
|
||
|
|
{
|
||
|
|
std::cout << "distance(" << name[*vi] << ") = " << d[*vi] << ", ";
|
||
|
|
std::cout << "parent(" << name[*vi] << ") = " << name[p[*vi]]
|
||
|
|
<< std::endl;
|
||
|
|
}
|
||
|
|
std::cout << std::endl;
|
||
|
|
|
||
|
|
std::ofstream dot_file("figs/dijkstra-eg.dot");
|
||
|
|
dot_file << "digraph D {\n"
|
||
|
|
<< " rankdir=LR\n"
|
||
|
|
<< " size=\"4,3\"\n"
|
||
|
|
<< " ratio=\"fill\"\n"
|
||
|
|
<< " edge[style=\"bold\"]\n"
|
||
|
|
<< " node[shape=\"circle\"]\n";
|
||
|
|
|
||
|
|
graph_traits< graph_t >::edge_iterator ei, ei_end;
|
||
|
|
for (boost::tie(ei, ei_end) = edges(g); ei != ei_end; ++ei)
|
||
|
|
{
|
||
|
|
graph_traits< graph_t >::edge_descriptor e = *ei;
|
||
|
|
graph_traits< graph_t >::vertex_descriptor u = source(e, g),
|
||
|
|
v = target(e, g);
|
||
|
|
dot_file << name[u] << " -> " << name[v] << "[label=\""
|
||
|
|
<< get(weightmap, e) << "\"";
|
||
|
|
if (p[v] == u)
|
||
|
|
dot_file << ", color=\"black\"";
|
||
|
|
else
|
||
|
|
dot_file << ", color=\"grey\"";
|
||
|
|
dot_file << "]";
|
||
|
|
}
|
||
|
|
dot_file << "}";
|
||
|
|
return EXIT_SUCCESS;
|
||
|
|
}
|