Re: [Boost-users] BGL: write_graphviz_dp taking in count values of dynamic_properties

On Mon, 30 Sep 2013, Pablo Madoery wrote:

Hi, I have the following code that print a graph taking in count values of dynamic_properties:

#include<iostream> #include #include

using namespace std; using namespace boost;

struct VertexInfo {     int id; };

struct EdgeInfo {     double weight;     bool enable; };

typedef adjacency_list Graph;

int main() {     ////////////////////////////////////////////////////////////////////////////////////////////     Graph graph;     Graph::vertex_descriptor a = add_vertex(graph);     Graph::vertex_descriptor b = add_vertex(graph);     Graph::vertex_descriptor c = add_vertex(graph);     Graph::vertex_descriptor d = add_vertex(graph);     Graph::edge_descriptor e1 = (add_edge(a, b, graph)).first;     Graph::edge_descriptor e2 = (add_edge(a, b, graph)).first;     Graph::edge_descriptor e3 = (add_edge(b, c, graph)).first;     Graph::edge_descriptor e4 = (add_edge(c, a, graph)).first;     Graph::edge_descriptor e5 = (add_edge(c, a, graph)).first;     Graph::edge_descriptor e6 = (add_edge(c, d, graph)).first;

    graph[e1].weight = 5;     graph[e2].weight = 10;     graph[e3].weight = 6;     graph[e4].weight = 14;     graph[e5].weight = 2;     graph[e6].weight = 3;

    graph[e1].enable = true;     graph[e2].enable = false;     graph[e3].enable = true;     graph[e4].enable = false;     graph[e5].enable = true;     graph[e6].enable = false;

    ofstream ofs("graph.dot");     dynamic_properties dp;     dp.property("node_id", get(vertex_index, graph));     dp.property("label", get(&EdgeInfo::weight, graph));     dp.property("taillabel", get(&EdgeInfo::enable, graph));     write_graphviz_dp(ofs, graph, dp);

    cout << "fin" << endl;

    return 0; }

///////////////////////////////////////////////////////////////////////////////////

there is a property called "enable" in the edges that I print in the tails of the arrows. But what i really want is that when enable = false the style of the arrow be different ("invis" for example). How can i do that?

Try something like this (not tested); be sure to include : dp.property( "style", boost::make_transform_value_property_map( enable_to_style(), get(&EdgeInfo::enable, graph))); where enable_to_style is something like: struct enable_to_style { std::string operator()(bool b) const { return b ? "solid" : "invis"; } }; -- Jeremiah Willcock