1 | #include <iostream> |
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2 | #include <fstream> |
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3 | |
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4 | #include <lemon/smart_graph.h> |
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5 | #include <lemon/dijkstra.h> |
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6 | #include <lemon/maps.h> |
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7 | #include <lemon/xy.h> |
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8 | #include <lemon/graph_reader.h> |
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9 | |
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10 | #include <lemon/time_measure.h> |
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11 | |
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12 | #include <cmath> |
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13 | |
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14 | |
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15 | using namespace lemon; |
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16 | |
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17 | template <typename CoordMap> |
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18 | class PotentialMap { |
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19 | public: |
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20 | typedef double Value; |
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21 | typedef typename CoordMap::Key Key; |
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22 | |
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23 | PotentialMap(const CoordMap& _coord, const xy<double>& _target) |
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24 | : coord(_coord), target(_target) {} |
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25 | |
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26 | double operator[](const Key& node) const { |
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27 | return std::sqrt((coord[node].x - target.x) * (coord[node].x - target.x) + |
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28 | (coord[node].y - target.y) * (coord[node].y - target.y)); |
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29 | } |
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30 | private: |
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31 | const CoordMap& coord; |
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32 | xy<double> target; |
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33 | }; |
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34 | |
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35 | template <typename Graph, typename LengthMap, typename PotentialMap> |
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36 | class ReducedLengthMap { |
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37 | public: |
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38 | typedef double Value; |
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39 | typedef typename LengthMap::Key Key; |
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40 | |
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41 | ReducedLengthMap(const Graph& _graph, const LengthMap& _length, |
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42 | const PotentialMap& _pot) |
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43 | : graph(_graph), length(_length), pot(_pot) {} |
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44 | |
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45 | Value operator[](const Key& edge) const { |
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46 | return length[edge] - (pot[graph.source(edge)] - pot[graph.target(edge)]); |
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47 | } |
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48 | |
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49 | private: |
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50 | const Graph& graph; |
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51 | const LengthMap& length; |
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52 | const PotentialMap& pot; |
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53 | }; |
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54 | |
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55 | int main() { |
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56 | typedef SmartGraph Graph; |
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57 | |
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58 | typedef Graph::Edge Edge; |
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59 | typedef Graph::Node Node; |
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60 | typedef Graph::EdgeIt EdgeIt; |
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61 | typedef Graph::NodeIt NodeIt; |
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62 | typedef Graph::EdgeMap<double> LengthMap; |
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63 | typedef Graph::NodeMap<xy<double> > CoordMap; |
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64 | |
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65 | SmartGraph graph; |
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66 | |
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67 | std::ifstream is("route.lgf"); |
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68 | GraphReader<Graph> reader(is, graph); |
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69 | |
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70 | CoordMap coord(graph); |
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71 | XMap<CoordMap> xcoord = xMap(coord); |
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72 | reader.readNodeMap("coordinates_x", xcoord); |
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73 | YMap<CoordMap> ycoord = yMap(coord); |
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74 | reader.readNodeMap("coordinates_y", ycoord); |
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75 | |
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76 | LengthMap length(graph); |
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77 | reader.readEdgeMap("length", length); |
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78 | |
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79 | Node source, target; |
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80 | reader.readNode("source", source); |
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81 | reader.readNode("target", target); |
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82 | |
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83 | reader.run(); |
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84 | |
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85 | { |
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86 | Timer timer; |
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87 | Dijkstra<Graph, LengthMap> dijkstra(graph, length); |
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88 | dijkstra.init(); |
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89 | dijkstra.addSource(source); |
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90 | dijkstra.start(target); |
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91 | |
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92 | std::cout << dijkstra.dist(target) << std::endl; |
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93 | std::cout << timer << std::endl; |
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94 | } |
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95 | |
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96 | { |
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97 | Timer timer; |
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98 | typedef PotentialMap<CoordMap> Potential; |
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99 | Potential potential(coord, coord[target]); |
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100 | |
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101 | typedef ReducedLengthMap<Graph, LengthMap, Potential> ReducedLength; |
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102 | ReducedLength reduced(graph, length, potential); |
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103 | |
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104 | Dijkstra<Graph, ReducedLength> dijkstra(graph, reduced); |
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105 | |
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106 | dijkstra.init(); |
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107 | dijkstra.addSource(source); |
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108 | dijkstra.start(target); |
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109 | |
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110 | std::cout << dijkstra.dist(target) + potential[source] << std::endl; |
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111 | std::cout << timer << std::endl; |
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112 | } |
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113 | |
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114 | return 0; |
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115 | } |
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