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 <boost/graph/adjacency_list.hpp>
#include <boost/graph/graphviz.hpp>

using namespace std;
using namespace boost;

struct VertexInfo
{
    int id;
};

struct EdgeInfo
{
    double weight;
    bool enable;
};

typedef adjacency_list<listS, vecS, bidirectionalS, VertexInfo, EdgeInfo> 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 <boost/property_map/transform_value_property_map.hpp>:

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
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