c++ - Manually colouring of boost's graphs -


i'm struggling trying manually colouring graph's vertices using boost. wrote code below can't figure out why generated file not have colour.

int main(int,char*[]) {     typedef property<edge_name_t, string> edgeproperties;     typedef property<vertex_name_t, string, property<vertex_color_t, default_color_type>> vertexproperties;     typedef adjacency_list<vecs, vecs, directeds, vertexproperties, edgeproperties> graph;     typedef graph_traits<graph>::vertex_descriptor vertex;     typedef graph_traits<graph>::edge_descriptor edge;      graph g;     property_map<graph, vertex_name_t>::type vertex_label = get(vertex_name, g);     property_map<graph, vertex_color_t>::type color_map = get(vertex_color, g);     property_map<graph, edge_name_t>::type edge_label = get(edge_name, g);      vertex v1 = add_vertex(g);     vertex_label[v1] = "v1";      put(color_map, v1, boost::red_color);      std::ofstream outf("example.gv");     write_graphviz(outf, g,                    make_label_writer(vertex_label),                    make_label_writer(edge_label)                    );     return 0; }

vertex colourings algorithmic detail. there no "automatic" provision translate graphviz, far know.

you can add custom attributes though.

i'd change around use dynamic properties:

std::ofstream outf("example.gv");  dynamic_properties dp; dp.property("node_id", get(vertex_index, g)); dp.property("label", vertex_label); dp.property("label", edge_label);  write_graphviz_dp(outf, g, dp);

now it's simple adding new vertex attribute dynamic set:

dp.property("color", make_transform_value_property_map(&color_to_string, color_map));

the complication need supply conversion default_color_type text. symptom of fact color maps aren't used representational purposes. here's working sample:

live on coliru

#include <boost/graph/adjacency_list.hpp> #include <boost/graph/graphviz.hpp> #include <iostream> using namespace boost;  inline char const* color_to_string(default_color_type c) {     switch(c) {         case default_color_type::red_color:   return "red";         case default_color_type::green_color: return "green";         case default_color_type::gray_color:  return "gray";         case default_color_type::white_color: return "white";         case default_color_type::black_color: return "black";     }     return ""; // not known }   int main() {     typedef property<edge_name_t, std::string> edgeproperties;     typedef property<vertex_name_t, std::string, property<vertex_color_t, default_color_type>> vertexproperties;     typedef adjacency_list<vecs, vecs, directeds, vertexproperties, edgeproperties> graph;     typedef graph_traits<graph>::vertex_descriptor vertex;      graph g;     property_map<graph, vertex_name_t>::type vertex_label = get(vertex_name, g);     property_map<graph, vertex_color_t>::type color_map = get(vertex_color, g);     property_map<graph, edge_name_t>::type edge_label = get(edge_name, g);      vertex v1 = add_vertex(g);     vertex_label[v1] = "v1";      put(color_map, v1, boost::red_color);      dynamic_properties dp;     dp.property("node_id", get(vertex_index, g));     dp.property("label", vertex_label);     dp.property("label", edge_label);     dp.property("color", make_transform_value_property_map(&color_to_string, color_map));      write_graphviz_dp(std::cout, g, dp); }

prints:

digraph g { 0 [color=red, label=v1]; }

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