Re: [Boost-users] BGL: Write graphviz file with invisible edges

Subject: Re: [Boost-users] BGL: Write graphviz file with invisible edges
From: Jeremiah Willcock (jewillco_at_[hidden])
Date: 2011-06-21 14:08:39

On Tue, 21 Jun 2011, David Doria wrote:

>> The strategy for doing that is to create a dynamic_properties object, add an
>> entry to it for the "style" edge property and some property map, and then
>> pass that to write_graphviz_dp.  An example of what you want to do is in
>> libs/graph/example/graphviz.cpp; see how the "weight" property is handled.
>>  In your case, the value type of the property would be std::string.
>>
>> -- Jeremiah Willcock
>
> Thanks Jeremiah,
>
> Here is what I tried:
>
> #include <iostream>
> #include <string>
>
> #include <boost/graph/undirected_graph.hpp>
> #include <boost/graph/graphviz.hpp>
>
> struct StyleProperty
> {
>  std::string style;
> }
>
> typedef boost::undirected_graph<boost::no_property, StyleProperty> Graph;
>
> int main()
> {
> Graph g;
> Graph::vertex_descriptor v0 = g.add_vertex();
> Graph::vertex_descriptor v1 = g.add_vertex();
> Graph::vertex_descriptor v2 = g.add_vertex();
>
> StyleProperty styleInvisible;
> styleInvisible.style = "invis";
>
> StyleProperty styleNormal;
> styleNormal = "normal";
>
> boost::add_edge(v0,v1,styleInvisible, g);
> boost::add_edge(v1,v2,styleNormal g);
>
> boost::dynamic_properties dp;
> dp.property("style", get(&StyleProperty::style, g));
>
> boost::write_graphviz_dp(std::cout, g, dp, "style");

The last argument here shouldn't be "style" -- it should be the 
default "node_id" or something else that can be used to identify vertices 
in the graph.

> return 0;
> }
>
> However, I get an exception "dynamic property get cannot retrieve
> value for property: style."

I'm not sure what the issue is for that -- try changing the call to 
write_graphviz_dp and see if it recurs.

-- Jeremiah Willcock