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Graph::Writer::Dot(3pm) User Contributed Perl Documentation Graph::Writer::Dot(3pm)


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


  use Graph;
  use Graph::Writer::Dot;
  $graph = Graph->new();
  # add edges and nodes to the graph
  $writer = Graph::Writer::Dot->new();
  $writer->write_graph($graph, '');


Graph::Writer::Dot is a class for writing out a directed graph in the file format used by the dot tool (part of the AT+T graphviz package). The graph must be an instance of the Graph class, which is actually a set of classes developed by Jarkko Hietaniemi.



Constructor - generate a new writer instance.

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

This can take one optional argument that tell to cluster nodes in subgraphs by using the attribute passed as value. See:

  $writer = Graph::Writer::Dot->new(cluster => 'group');

It will group nodes that have the the same value in the 'group' attribute.


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.

The home page for the AT+T graphviz toolkit that includes the dot tool.
Jarkko Hietaniemi's modules for representing directed graphs, available from CPAN under modules/by-module/Graph/
The O'Reilly book which has a chapter on directed graphs, which is based around Jarkko's modules.
The base-class for Graph::Writer::Dot




Neil Bowers <>


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.

2021-09-19 perl v5.32.1