
Boost Users : 
Subject: Re: [Boostusers] Iterating over vertices in a specific region in a graph
From: David Doria (daviddoria_at_[hidden])
Date: 20120122 16:06:46
> You would need to do that by hand; note that there is a function to convert
> from coordinates to graph vertices.
>
>  Jeremiah Willcock
Hi Jeremiah,
You mean there is something more "built in" than this: ?
#include "boost/graph/adjacency_list.hpp"
#include "boost/graph/simple_point.hpp"
namespace boost {
enum vertex_coordinate_t { vertex_coordinate };
BOOST_INSTALL_PROPERTY(vertex, coordinate);
};
int main(int argc, char *argv[])
{
typedef boost::simple_point<float> PointType;
typedef boost::adjacency_list<boost::vecS,
boost::vecS,
boost::undirectedS,
boost::property<
boost::vertex_coordinate_t, PointType >
> Graph;
Graph g;
typedef typename boost::property_map<Graph,
boost::vertex_coordinate_t>::type CoordinatePropertyMap;
CoordinatePropertyMap coordinatePropertyMap =
get(boost::vertex_coordinate, g);
return 0;
}
(i.e. can you point me to the function you are talking about : ) ?)
Also, the reason I am not using boost::grid_graph is that there are
"holes" in my graph  i.e. not every integer coordinate has a vertex.
Does the coordinatetovertex_descriptor function you are talking
about handle the case when a vertex doesn't exist at the specified
coordinate?
Thanks,
David
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