Changeset 164:00d297da491e in lemon1.2 for demo/lgf_demo.cc
 Timestamp:
 05/31/08 12:34:44 (16 years ago)
 Branch:
 default
 Phase:
 public
 File:

 1 edited
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demo/lgf_demo.cc
r143 r164 21 21 ///\brief Demonstrating graph input and output 22 22 /// 23 /// This simple demo program gives an example of how to read and write24 /// a graph and additional maps (on the nodes or the edges) from/to a25 /// stream.23 /// This program gives an example of how to load a directed graph from 24 /// an \ref lgfformat "LGF" file with the \ref lemon::DigraphReader 25 /// "DigraphReader" class. 26 26 /// 27 /// \include reader_writer_demo.cc 27 /// The \c "digraph.lgf" file: 28 /// \include digraph.lgf 29 /// 30 /// And the program which reads it: 31 /// \include lgf_demo.cc 28 32 29 33 #include <iostream> … … 36 40 using namespace lemon; 37 41 38 int main( int argc, const char *argv[]) {39 const int n = argc > 1 ? std::atoi(argv[1]) : 20;40 const int e = argc > 2 ? std::atoi(argv[2]) : static_cast<int>(n * std::log(double(n)));41 const int m = argc > 3 ? std::atoi(argv[3]) : 100;42 int main() { 43 SmartDigraph g; 44 SmartDigraph::ArcMap<int> cap(g); 45 SmartDigraph::Node s, t; 42 46 43 SmartDigraph digraph; 47 digraphReader("digraph.lgf", g). // read the directeg graph into g 48 arcMap("capacity", cap). // read the 'capacity' arc map into cap 49 node("source", s). // read 'source' node to s 50 node("target", t). // read 'target' node to t 51 run(); 44 52 45 std::stringstream ss; 53 std::cout << "Digraph read from 'digraph.lgf'" << std::endl; 54 std::cout << "Number of nodes: " << countNodes(g) << std::endl; 55 std::cout << "Number of arcs: " << countArcs(g) << std::endl; 46 56 47 try {57 std::cout << "We can write it to the standard output:" << std::endl; 48 58 49 typedef SmartDigraph Digraph; 50 typedef Digraph::Node Node; 51 typedef Digraph::Arc Arc; 52 typedef Digraph::ArcIt ArcIt; 53 54 typedef Digraph::NodeMap<int> PotentialMap; 55 typedef Digraph::ArcMap<int> CapacityMap; 56 typedef Digraph::ArcMap<std::string> NameMap; 57 58 Digraph digraph; 59 PotentialMap potential(digraph); 60 CapacityMap capacity(digraph); 61 NameMap name(digraph); 62 63 std::vector<Node> nodes; 64 for (int i = 0; i < n; ++i) { 65 Node node = digraph.addNode(); 66 potential[node] = rnd[m]; 67 nodes.push_back(node); 68 } 69 70 std::vector<Arc> arcs; 71 for (int i = 0; i < e; ++i) { 72 int s = rnd[n]; 73 int t = rnd[n]; 74 int c = rnd[m]; 75 Arc arc = digraph.addArc(nodes[s], nodes[t]); 76 capacity[arc] = c; 77 std::ostringstream os; 78 os << "arc \t" << i << std::endl; 79 name[arc] = os.str(); 80 arcs.push_back(arc); 81 } 82 83 84 DigraphWriter<Digraph>(ss, digraph). 85 nodeMap("potential", potential). 86 arcMap("capacity", capacity). 87 arcMap("name", name). 88 node("source", nodes[0]). 89 node("target", nodes[1]). 90 arc("bottleneck", arcs[e / 2]). 91 attribute("creator", "lemon library"). 92 run(); 93 94 } catch (DataFormatError& error) { 95 std::cerr << error.what() << std::endl; 96 } 97 98 try { 99 100 typedef SmartDigraph Digraph; 101 typedef Digraph::Node Node; 102 typedef Digraph::Arc Arc; 103 typedef Digraph::ArcIt ArcIt; 104 105 typedef Digraph::NodeMap<int> LabelMap; 106 typedef Digraph::NodeMap<int> PotentialMap; 107 typedef Digraph::ArcMap<int> CapacityMap; 108 typedef Digraph::ArcMap<std::string> NameMap; 109 110 Digraph digraph; 111 LabelMap label(digraph); 112 PotentialMap potential(digraph); 113 CapacityMap capacity(digraph); 114 NameMap name(digraph); 115 116 Node s, t; 117 Arc a; 118 119 std::string creator; 120 121 for (int i = 0; i < n; ++i) { 122 Node node = digraph.addNode(); 123 label[node] = i; 124 } 125 126 DigraphReader<Digraph>(ss, digraph). 127 useNodes(label). 128 nodeMap("potential", potential). 129 arcMap("capacity", capacity). 130 arcMap("name", name). 131 node("source", s). 132 node("target", t). 133 arc("bottleneck", a). 134 attribute("creator", creator). 135 run(); 136 137 DigraphWriter<Digraph>(std::cout, digraph). 138 nodeMap("potential", potential). 139 arcMap("capacity", capacity). 140 arcMap("name", name). 141 node("source", s). 142 node("target", t). 143 arc("bottleneck", a). 144 attribute("creator", creator). 145 run(); 146 147 } catch (DataFormatError& error) { 148 std::cerr << error.what() << std::endl; 149 } 150 59 digraphWriter(std::cout, g). // write g to the standard output 60 arcMap("capacity", cap). // write cap into 'capacity' 61 node("source", s). // write s to 'source' 62 node("target", t). // write t to 'target' 63 run(); 151 64 152 65 return 0;
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