1 | /* -*- C++ -*- |
---|
2 | * |
---|
3 | * This file is a part of LEMON, a generic C++ optimization library |
---|
4 | * |
---|
5 | * Copyright (C) 2003-2006 |
---|
6 | * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport |
---|
7 | * (Egervary Research Group on Combinatorial Optimization, EGRES). |
---|
8 | * |
---|
9 | * Permission to use, modify and distribute this software is granted |
---|
10 | * provided that this copyright notice appears in all copies. For |
---|
11 | * precise terms see the accompanying LICENSE file. |
---|
12 | * |
---|
13 | * This software is provided "AS IS" with no warranty of any kind, |
---|
14 | * express or implied, and with no claim as to its suitability for any |
---|
15 | * purpose. |
---|
16 | * |
---|
17 | */ |
---|
18 | |
---|
19 | #include <lemon/grid_graph.h> |
---|
20 | #include <lemon/graph_adaptor.h> |
---|
21 | #include <lemon/graph_to_eps.h> |
---|
22 | #include <lemon/bfs.h> |
---|
23 | #include <lemon/xy.h> |
---|
24 | |
---|
25 | #include <iostream> |
---|
26 | #include <fstream> |
---|
27 | |
---|
28 | ///\ingroup demos |
---|
29 | ///\file |
---|
30 | ///\brief Labirinth example with grid graph. |
---|
31 | /// |
---|
32 | /// Labirinth example with grid graph. |
---|
33 | /// |
---|
34 | /// The input file is: |
---|
35 | /// |
---|
36 | /// \include grid_graph_demo.in |
---|
37 | /// |
---|
38 | /// The result: |
---|
39 | /// |
---|
40 | /// \image html grid_graph_demo.png |
---|
41 | /// \image latex grid_graph_demo.eps "The labirinth" width=\textwidth |
---|
42 | /// |
---|
43 | /// The source: |
---|
44 | /// |
---|
45 | /// \include grid_graph_demo.cc |
---|
46 | |
---|
47 | using namespace lemon; |
---|
48 | using namespace std; |
---|
49 | |
---|
50 | int main() { |
---|
51 | ifstream in("grid_graph_demo.in"); |
---|
52 | int width, height; |
---|
53 | in >> width >> height; |
---|
54 | int start_x, start_y; |
---|
55 | in >> start_x >> start_y; |
---|
56 | int stop_x, stop_y; |
---|
57 | in >> stop_x >> stop_y; |
---|
58 | |
---|
59 | GridGraph graph(width, height); |
---|
60 | GridGraph::Node start = graph(start_x - 1, start_y - 1); |
---|
61 | GridGraph::Node stop = graph(stop_x - 1, stop_y - 1); |
---|
62 | GridGraph::NodeMap<bool> filter(graph); |
---|
63 | |
---|
64 | for (int j = 0; j < height; ++j) { |
---|
65 | in >> ws; |
---|
66 | for (int i = 0; i < width; ++i) { |
---|
67 | char c; in >> c; |
---|
68 | filter[graph(i, j)] = (c == '.'); |
---|
69 | } |
---|
70 | } |
---|
71 | |
---|
72 | typedef NodeSubGraphAdaptor<GridGraph, |
---|
73 | GridGraph::NodeMap<bool> > FilteredGraph; |
---|
74 | |
---|
75 | FilteredGraph filtered(graph, filter); |
---|
76 | |
---|
77 | Bfs<FilteredGraph> bfs(filtered); |
---|
78 | std::cout << "The length of shortest path: " << |
---|
79 | bfs.run(start, stop) << std::endl; |
---|
80 | |
---|
81 | FilteredGraph::EdgeMap<bool> path(filtered, false); |
---|
82 | |
---|
83 | for (GridGraph::Node node = stop; |
---|
84 | node != start; node = bfs.predNode(node)) { |
---|
85 | path[bfs.predEdge(node)] = true; |
---|
86 | } |
---|
87 | |
---|
88 | graphToEps(filtered, "grid_graph_demo.eps").scaleToA4(). |
---|
89 | title("Grid graph"). |
---|
90 | copyright("(C) 2006 LEMON Project"). |
---|
91 | coords(scaleMap(indexMap(graph), 10)). |
---|
92 | enableParallel(). |
---|
93 | nodeScale(0.5). |
---|
94 | drawArrows(). |
---|
95 | edgeColors(composeMap(ColorSet(), path)). |
---|
96 | run(); |
---|
97 | |
---|
98 | std::cout << "The shortest path is written to grid_graph_demo.eps" |
---|
99 | << std::endl; |
---|
100 | |
---|
101 | return 0; |
---|
102 | } |
---|