This is just a fork to get a fixed version of this gem. I would prefer the original author to do this, but he seems to have abandoned this gem and I need this fix.

This is the original README with original author etc. All respect is to him.

Ruby/GraphViz

Doc : rdoc.info/projects/glejeune/Ruby-Graphviz
Sources : github.com/glejeune/Ruby-Graphviz
NEW - Mailing List : groups.google.com/group/ruby-graphviz

DESCRIPTION

Interface to the GraphViz graphing tool

TODO

New FamilyTree

SYNOPSIS

A basic example

require 'graphviz'

# Create a new graph
g = GraphViz.new( :G, :type => :digraph )

# Create two nodes
hello = g.add_nodes( "Hello" )
world = g.add_nodes( "World" )

# Create an edge between the two nodes
g.add_edges( hello, world )

# Generate output image
g.output( :png => "hello_world.png" )

The same but with a block

require 'graphviz'

GraphViz::new( :G, :type => :digraph ) { |g|
  g.world( :label => "World" ) << g.hello( :label => "Hello" )
}.output( :png => "hello_world.png" )

Or with the DSL

require 'graphviz/dsl'
digraph :G do
  world[:label => "World"] << hello[:label => "Hello"]

  output :png => "hello_world.png"
end

Create a graph from a file

require 'graphviz'

# In this example, hello.dot is :
#   digraph G {Hello->World;}

GraphViz.parse( "hello.dot", :path => "/usr/local/bin" ) { |g|
  g.get_node("Hello") { |n|
    n[:label] = "Bonjour"
  }
  g.get_node("World") { |n|
    n[:label] = "Le Monde"
  }
}.output(:png => "sample.png")

GraphML support

require 'graphviz/graphml'

g = GraphViz::GraphML.new( "graphml/cluster.graphml" )
g.graph.output( :path => "/usr/local/bin", :png => "#{$0}.png" )

TOOLS

Ruby/GraphViz also includes :

ruby2gv, a simple tool that allows you to create a dependency graph from a ruby script. Example : drp.ly/dShaZ
```
ruby2gv -Tpng -oruby2gv.png ruby2gv
```
gem2gv, a tool that allows you to create a dependency graph between gems. Example : drp.ly/dSj9Y
```
gem2gv -Tpng -oruby-graphviz.png ruby-graphviz
```

dot2ruby, a tool that allows you to create a ruby script from a graphviz script

$ cat hello.dot
digraph G {Hello->World;}

$ dot2ruby hello.dot
# This code was generated by dot2ruby.g

require 'rubygems'
require 'graphviz'
graph_g = GraphViz.digraph( "G" ) { |graph_g|
  graph_g[:bb] = '0,0,70,108'
  node_hello = graph_g.add_nodes( "Hello", :height => '0.5', :label => '\N', :pos => '35,90', :width => '0.88889' )
  graph_g.add_edges( "Hello", "World", :pos => 'e,35,36.413 35,71.831 35,64.131 35,54.974 35,46.417' )
  node_world = graph_g.add_nodes( "World", :height => '0.5', :label => '\N', :pos => '35,18', :width => '0.97222' )
}
puts graph_g.output( :canon => String )

git2gv, a tool that allows you to show your git commits : dl.dropbox.com/u/72629/ruby-graphviz-git.svg
xml2gv, a tool that allows you to show a xml file as graph.

GRAPH THEORY

require 'graphviz'
require 'graphviz/theory'

g = GraphViz.new( :G ) { ... }

t = GraphViz::Theory.new( g )

puts "Adjancy matrix : "
puts t.adjancy_matrix

puts "Symmetric ? #{t.symmetric?}"

puts "Incidence matrix :"
puts t.incidence_matrix

g.each_node do |name, node|
  puts "Degree of node `#{name}' = #{t.degree(node)}"
end

puts "Laplacian matrix :"
puts t.laplacian_matrix

puts "Dijkstra between a and f"
r = t.moore_dijkstra(g.a, g.f)
if r.nil?
  puts "No way !"
else
  print "\tPath : "; p r[:path]
  puts "\tDistance : #{r[:distance]}"
end

print "Ranges : "
rr = t.range
p rr
puts "Your graph contains circuits" if rr.include?(nil)

puts "Critical path : "
rrr = t.critical_path
print "\tPath "; p rrr[:path]
puts "\tDistance : #{rrr[:distance]}"

INSTALLATION

sudo gem install ruby-graphviz

You also need to install GraphViz

On Windows you also need to install win32-open3. This is not an absolute requirement.

LICENCES

Ruby/GraphViz

Ruby/GraphViz is freely distributable according to the terms of the GNU General Public License (see the file ‘COPYING’).

This program is distributed without any warranty. See the file ‘COPYING’ for details.

GNU General Public Licence: en.wikipedia.org/wiki/Gpl

nothugly.xsl

By Vidar Hokstad and Ryan Shea; Contributions by Jonas Tingborn, Earl Cummings, Michael Kennedy (Graphviz 2.20.2 compatibility, bug fixes, testing, lots of gradients)

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

MIT license: en.wikipedia.org/wiki/MIT_License