NAME

       Graph::Writer::VCG - write out directed graph in VCG format

SYNOPSIS

         use Graph;
         use Graph::Writer::VCG;

         $graph = Graph->new();
         # add edges and nodes to the graph

         $writer = Graph::Writer::VCG->new();
         $writer->write_graph($graph, 'mygraph.vcg');

DESCRIPTION

       Graph::Writer::VCG is a class for writing out a directed graph in the file format used by
       the VCG tool, originally developed for Visualising Compiler Graphs.  The graph must be an
       instance of the Graph class, which is actually a set of classes developed by Jarkko
       Hietaniemi.

       If you have defined any attributes for the graph, nodes, or edges, they will be written
       out to the file, as long as they are attributes understood by VCG.

METHODS

   new()
       Constructor - generate a new writer instance.

         $writer = Graph::Writer::VCG->new();

       This doesn't take any arguments.

   write_graph()
       Write a specific graph to a named file:

         $writer->write_graph($graph, $file);

       The $file argument can either be a filename, or a filehandle for a previously opened file.

KNOWN BUGS AND LIMITATIONS

       •   Attributes with non-atomic values aren't currently handled.  This includes the loc,
           classname, colorentry, and infoname attributes for graphs, and the loc attribute for
           nodes,

       •   Can currently only handle graph, node, and edge elements and their attributes.  So
           doesn't know about foldnode_defaults and things like that.

SEE ALSO

       http://www.cs.uni-sb.de/RW/users/sander/html/gsvcg1.html
           The home page for VCG.

       Graph
           Jarkko Hietaniemi's modules for representing directed graphs, available from CPAN
           under modules/by-module/Graph/

       Algorithms in Perl
           The O'Reilly book which has a chapter on directed graphs, which is based around
           Jarkko's modules.

       Graph::Writer
           The base-class for Graph::Writer::VCG

AUTHOR

       Neil Bowers <neil@bowers.com>

COPYRIGHT

       Copyright (c) 2001-2012, Neil Bowers. All rights reserved.  Copyright (c) 2001, Canon
       Research Centre Europe. All rights reserved.

       This script is free software; you can redistribute it and/or modify it under the same
       terms as Perl itself.