deba@1680: #include <lemon/grid_graph.h>
deba@1680: #include <lemon/graph_adaptor.h>
deba@1680: #include <lemon/graph_to_eps.h>
deba@1681: #include <lemon/bfs.h>
deba@1680: #include <lemon/xy.h>
deba@1680: 
deba@1680: #include <iostream>
deba@1680: #include <fstream>
deba@1680: 
deba@1680: using namespace lemon;
deba@1680: using namespace std;
deba@1680: 
deba@1680: int main() {
deba@1681:   ifstream in("grid_graph_demo.in");
deba@1681:   int width, height;
deba@1681:   in >> width >> height;
deba@1681:   int start_x, start_y;
deba@1681:   in >> start_x >> start_y;
deba@1681:   int stop_x, stop_y;
deba@1681:   in >> stop_x >> stop_y;
deba@1681: 
deba@1681:   GridGraph graph(width, height);
deba@1681:   GridGraph::Node start = graph(start_x - 1, start_y - 1);
deba@1681:   GridGraph::Node stop = graph(stop_x - 1, stop_y - 1);
deba@1681:   GridGraph::NodeMap<bool> filter(graph);
deba@1681: 
deba@1681:   for (int j = 0; j < height; ++j) {
deba@1681:     in >> ws;
deba@1681:     for (int i = 0; i < width; ++i) {
deba@1681:       char c; in >> c;
deba@1681:       filter[graph(i, j)] = (c == '.');
deba@1681:     }
deba@1681:   }
deba@1681: 
deba@1681:   typedef NodeSubGraphAdaptor<GridGraph,
deba@1681:     GridGraph::NodeMap<bool> > FilteredGraph;
deba@1681: 
deba@1681:   FilteredGraph filtered(graph, filter);
deba@1681: 
deba@1681:   Bfs<FilteredGraph> bfs(filtered);
deba@1681:   std::cout << "The length of shortest path: " << 
deba@1681:     bfs.run(start, stop) << std::endl;
deba@1681: 
deba@1693:   FilteredGraph::EdgeMap<bool> path(filtered, false);
deba@1681:   
deba@1681:   for (GridGraph::Node node = stop; 
deba@1681:        node != start; node = bfs.predNode(node)) {
deba@1693:     path[bfs.pred(node)] = true;
deba@1681:   }
deba@1681:   
deba@1681:   graphToEps(filtered, "grid_graph.eps").scaleToA4().
deba@1680:     title("Grid graph").
deba@1680:     copyright("(C) 2005 LEMON Project").
deba@1693:     coords(scaleMap(indexMap(graph), 10)).
deba@1680:     enableParallel().
deba@1693:     nodeScale(0.5).
deba@1680:     drawArrows().
deba@1693:     edgeColors(composeMap(ColorSet(), path)).
deba@1680:     run();
deba@1681:   
deba@1681:   std::cout << "The shortest path is written to grid_graph.eps" << std::endl;
deba@1681: 
deba@1680:   return 0;
deba@1680: }