deba@1358: #include <iostream>
deba@1358: #include <fstream>
deba@1358: 
deba@1342: #include <lemon/smart_graph.h>
deba@1342: #include <lemon/dijkstra.h>
deba@1342: #include <lemon/maps.h>
deba@1342: #include <lemon/xy.h>
deba@1342: #include <lemon/graph_reader.h>
deba@1342: 
deba@1342: #include <lemon/time_measure.h>
deba@1342: 
deba@1342: #include <cmath>
deba@1342: 
deba@1358: 
deba@1342: using namespace lemon;
deba@1342: 
deba@1342: template <typename CoordMap>
deba@1342: class PotentialMap {
deba@1342: public:
deba@1342:   typedef double Value;
deba@1342:   typedef typename CoordMap::Key Key;
deba@1342: 
deba@1342:   PotentialMap(const CoordMap& _coord, const xy<double>& _target)
deba@1342:     : coord(_coord), target(_target) {}
deba@1342: 
deba@1342:   double operator[](const Key& node) const {
deba@1342:     return std::sqrt((coord[node].x - target.x) * (coord[node].x - target.x) + 
deba@1342: 		     (coord[node].y - target.y) * (coord[node].y - target.y));
deba@1342:   }
deba@1342: private:
deba@1358:   const CoordMap& coord;
deba@1342:   xy<double> target;
deba@1342: };
deba@1342: 
deba@1342: template <typename Graph, typename LengthMap, typename PotentialMap>
deba@1342: class ReducedLengthMap {
deba@1342: public:
deba@1342:   typedef double Value;
deba@1342:   typedef typename LengthMap::Key Key;
deba@1342: 
deba@1342:   ReducedLengthMap(const Graph& _graph, const LengthMap& _length, 
deba@1342: 		   const PotentialMap& _pot) 
deba@1342:     : graph(_graph), length(_length), pot(_pot) {}
deba@1342: 
deba@1342:   Value operator[](const Key& edge) const {
deba@1342:     return length[edge] - (pot[graph.source(edge)] - pot[graph.target(edge)]);
deba@1342:   }
deba@1342: 
deba@1342: private:
deba@1342:   const Graph& graph;
deba@1342:   const LengthMap& length;
deba@1342:   const PotentialMap& pot;
deba@1342: };
deba@1342: 
deba@1342: int main() {
deba@1342:   typedef SmartGraph Graph;
deba@1342: 
deba@1342:   typedef Graph::Edge Edge;
deba@1342:   typedef Graph::Node Node;
deba@1342:   typedef Graph::EdgeIt EdgeIt;
deba@1342:   typedef Graph::NodeIt NodeIt;
deba@1342:   typedef Graph::EdgeMap<double> LengthMap;
deba@1342:   typedef Graph::NodeMap<xy<double> > CoordMap;
deba@1342: 
deba@1342:   SmartGraph graph;
deba@1342: 
deba@1358:   std::ifstream is("route.lgf");
deba@1358:   GraphReader<Graph> reader(is, graph);
deba@1342:   
deba@1342:   CoordMap coord(graph);
deba@1342:   XMap<CoordMap> xcoord = xMap(coord);
deba@1342:   reader.addNodeMap("coordinates_x", xcoord);
deba@1342:   YMap<CoordMap> ycoord = yMap(coord);
deba@1342:   reader.addNodeMap("coordinates_y", ycoord);
deba@1342: 
deba@1342:   LengthMap length(graph);
deba@1342:   reader.addEdgeMap("length", length);
deba@1342: 
deba@1342:   Node source, target;
deba@1342:   reader.addNode("source", source);
deba@1342:   reader.addNode("target", target);
deba@1342: 
deba@1342:   reader.run();
deba@1342: 
deba@1342:   {
deba@1342:     Timer timer;
deba@1342:     Dijkstra<Graph, LengthMap> dijkstra(graph, length);
deba@1342:     dijkstra.init();
deba@1342:     dijkstra.addSource(source);
deba@1342:     dijkstra.start(target);
deba@1342: 
deba@1342:     std::cout << dijkstra.dist(target) << std::endl;
deba@1342:     std::cout << timer << std::endl;
deba@1342:   }
deba@1342: 
deba@1342:   {
deba@1342:     Timer timer;
deba@1342:     typedef PotentialMap<CoordMap> Potential;
deba@1342:     Potential potential(coord, coord[target]);
deba@1342: 
deba@1342:     typedef ReducedLengthMap<Graph, LengthMap, Potential> ReducedLength;
deba@1342:     ReducedLength reduced(graph, length, potential);
deba@1342: 
deba@1342:     Dijkstra<Graph, ReducedLength> dijkstra(graph, reduced);
deba@1342: 
deba@1342:     dijkstra.init();
deba@1342:     dijkstra.addSource(source);
deba@1342:     dijkstra.start(target);
deba@1342:   
deba@1342:     std::cout << dijkstra.dist(target) + potential[source] << std::endl;
deba@1342:     std::cout << timer << std::endl;
deba@1342:   }
deba@1342: 
deba@1342:   return 0;
deba@1342: }