Graphviz, from AT & T Research Labs, is a stand-alone package for manipulating graphs.

See Wikipedia for more on graphs.

Graphviz contains an array of programs and APIs.

A typical tool within this package is dot, which takes as input a (text file) graph description written in the DOT language. Such files are simply referred to as *.gv files. It can output graphs in a variety of formats.

Various people have written Perl wrappers around Graphviz:

Leon chose to use an upper-case V in the name of his package.

GraphViz was written quite some time ago, and targeted at a now-old version of Graphviz, and also hard-coded various features.

This module is now maintained by Ron Savage, but is deprecated in favour of GraphViz2 (below).

This is my re-write from scratch of Léon's GraphViz. It uses Marpa::R2 by Jeffrey Kegler.

This module parses Graphviz DOT files.

This module is a sub-class of GraphViz2::Marpa.

It provides a small set of path analysis tools, after lexing and parsing *.gv files.

These tools are:

(a) Finding clusters

Here, a cluster is a set of nodes connected to each other, but not connected to any nodes outside the cluster.

(b) Finding all paths of a fixed length starting from a given node

This module uses Marpa to parse my language called DASH, and creates a tree to hold that grammar.

DASH is a subset of the language parsed by Graph::Easy, which in turn is a wrapper around DOT (the Graphviz language).

The default renderer which ships with MarpaX::Languages::Dash outputs the tree to a DOT file, and calls GraphViz2 to generate an SVG file.

This module uses Marpa to parse a grammar, and then creates a tree to hold that grammar.

This module uses the previous one to parse a grammar, and then turns that grammar into an image.