Gviz

Ruby's interface of graphviz. It generate a dot file with simple ruby's syntax. Some implementations of Gviz are inspired by Ryan Davis's Graph.

Installation

Add this line to your application's Gemfile:

gem 'gviz'

And then execute:

$ bundle

Or install it yourself as:

$ gem install gviz

Usage

A simple example.

# add nodes and edges(route method)
# save to files with dot and png formats(save method)
require "gviz"

Graph do
  route :main => [:init, :parse, :cleanup, :printf]
  route :init => :make, :parse => :execute
  route :execute => [:make, :compare, :printf]

  save(:sample1, :png)
end

Graph is a shortcut for Gviz.new.graph.

This outputs sample1.dot and sample1.png files shown as below.

Add some attributes to the graph, nodes, edges.

## add color to all nodes with color set(nodes, nodeset and node methods)
## add color & styles to all edges(edges method)
## add color & styles to a edge(edge method)
## add bgcolor to a graph(global method)
require "gviz"

Graph do
  route :main => [:init, :parse, :cleanup, :printf]
  route :init => :make, :parse => :execute
  route :execute => [:make, :compare, :printf]

  nodes(colorscheme:'piyg8', style:'filled')
  nodeset.each.with_index(1) { |nd, i| node(nd.id, fillcolor:i) }
  edges(arrowhead:'onormal', style:'bold', color:'magenta4')
  edge(:main_printf, arrowtail:'diamond', dir:'both', color:'#3355FF')
  global(bgcolor:'powderblue')

  save(:sample2, :png)
end

This outputs below.

Modify some.

## define specific edge port(node label & edge method)
## adjust node positions(rank method)
## define subgraph(subgraph method) 
require "gviz"

Graph do
  route :main => [:init, :parse, :cleanup, :printf]
  route :init => :make, :parse => :execute
  route :execute => [:make, :compare, :printf]

  nodes colorscheme:'piyg8', style:'filled'
  nodeset.each.with_index(1) { |nd, i| node nd.id, fillcolor:i }
  edges arrowhead:'onormal', style:'bold', color:'magenta4'
  edge :main_printf, arrowtail:'diamond', dir:'both', color:'#3355FF'
  global bgcolor:'powderblue'

  node :execute, shape:'Mrecord', label:'{<x>execute | {a | b | c}}'
  node :printf, shape:'Mrecord', label:'{printf |<y> format}'
  edge 'execute:x_printf:y'
  rank :same, :cleanup, :execute
  subgraph do
    global label:'SUB'
    node :init
    node :make
  end

  save(:sample3, :png)
end

This outputs below.

Use for Drawing

Gviz helps you easily to draw shapes on an exact position using shape-named methods.

require "gviz"

Graph do
  line :a, from:[-100,0], to:[100,0]
  line :b, from:[0,-100], to:[0,100]
  circle :c
  rect :d, x:50, y:50, fillcolor:"green", label:"Rect"
  triangle :e, x:50, y:-50, fillcolor:"cyan"
  diamond :f, x:-50, y:50, fillcolor:"magenta"
  egg :g, x:-50, y:-50, fillcolor:"yellow", label:"Egg"

  save :draw
end

This outputs below(consider a scale if save to output formats).

Another examples are at examples directory

gviz command

It comes with a gviz command. This works with a graph spec file. If 'graph.ru' file exist on a directory of the execution, it will be automatically loaded as a graph spec file.

Example of graph.ru:

  route :main => [:init, :parse, :cleanup, :printf]
  route :init => :make, :parse => :execute
  route :execute => [:make, :compare, :printf]

  save(:sample, :png)

Usage:

  gviz build [FILE] [options]

where [options] are:

--name,   -n :   Graph name (default: G)
--type,   -t :   Graph type (default: digraph)

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request