Class: GraphViz

Inherits:
Object show all
Includes:
Constants, Utils
Defined in:
lib/graphviz/constants.rb,
lib/graphviz.rb,
lib/graphviz/ext.rb,
lib/graphviz/xml.rb,
lib/graphviz/node.rb,
lib/graphviz/edge.rb,
lib/graphviz/types.rb,
lib/graphviz/attrs.rb,
lib/graphviz/utils.rb,
lib/graphviz/theory.rb,
lib/graphviz/graphml.rb,
lib/graphviz/nothugly.rb,
lib/graphviz/elements.rb,
lib/graphviz/dot_script.rb,
lib/graphviz/types/rect.rb,
lib/graphviz/types/color.rb,
lib/graphviz/math/matrix.rb,
lib/graphviz/family_tree.rb,
lib/graphviz/utils/colors.rb,
lib/graphviz/types/gv_bool.rb,
lib/graphviz/types/gv_double.rb,
lib/graphviz/types/esc_string.rb,
lib/graphviz/types/arrow_type.rb,
lib/graphviz/types/color_list.rb,
lib/graphviz/types/lbl_string.rb,
lib/graphviz/types/spline_type.rb,
lib/graphviz/types/html_string.rb,
lib/graphviz/family_tree/couple.rb,
lib/graphviz/family_tree/person.rb,
lib/graphviz/family_tree/sibling.rb,
lib/graphviz/family_tree/generation.rb

Overview

TODO: Remove

Defined Under Namespace

Modules: Constants, Utils Classes: Attrs, DOTScript, DOTScriptData, DSL, Edge, Elements, Ext, FamilyTree, GraphML, GraphMLError, Math, Node, Theory, Types, XML

Constant Summary

@@format =

Var: Output format (dot, png, jpeg, …)

nil
@@prog =

Var: program to use (dot|twopi)

"dot"
@@path =

Var: program path

[]
@@errors =

Var: Error level

1
@@extlibs =

Var: External libraries

[]

Constants included from Constants

Constants::EDGESATTRS, Constants::FORMATS, Constants::GENCS_ATTRS, Constants::GRAPHSATTRS, Constants::GRAPHTYPE, Constants::NODESATTRS, Constants::PROGRAMS, Constants::RGV_VERSION

Instance Attribute Summary (collapse)

Class Method Summary (collapse)

Instance Method Summary (collapse)

Methods included from Utils

#escape_path_containing_blanks, #find_executable, #output_and_errors_from_command, #output_from_command

Methods included from Constants

getAttrsFor

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

- (Object) method_missing(idName, *args, &block)

:nodoc:



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# File 'lib/graphviz.rb', line 350

def method_missing( idName, *args, &block ) #:nodoc:
  xName = idName.id2name

  rCod = nil

  if block
    # Creating a cluster named '#{xName}'
    rCod = add_graph( xName, args[0]||{} )
    yield( rCod )
  else
    # Create a node named '#{xName}' or search for a node, edge or cluster
    if @hoNodes.keys.include?( xName )
      if( args[0] )
        return { xName => args[0] }
      else
        return( @hoNodes[xName] )
      end
    end
    return( @hoGraphs[xName] ) if @hoGraphs.keys.include?( xName )

    rCod = add_nodes( xName, args[0]||{} )
  end

  return rCod
end

Instance Attribute Details

- (Object) edge Also known as: edge_attrs

This accessor allow you to set global edges attributes



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# File 'lib/graphviz.rb', line 82

def edge
  @edge
end

- (Object) graph

This accessor allow you to set global graph attributes



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# File 'lib/graphviz.rb', line 74

def graph
  @graph
end

- (Object) node Also known as: node_attrs

This accessor allow you to set global nodes attributes



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# File 'lib/graphviz.rb', line 78

def node
  @node
end

Class Method Details

+ (Object) commonGraph(o1, o2)

:nodoc:



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# File 'lib/graphviz.rb', line 690

def self.commonGraph( o1, o2 ) #:nodoc:
  g1 = o1.pg
  g2 = o2.pg

  return o1 if g1.nil?
  return o2 if g2.nil?

  return g1 if g1.object_id == g2.object_id

  return GraphViz::commonGraph( g1, g2 )
end

+ (Object) default(hOpts)

Change default options (:use, :path, :errors and :output)



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# File 'lib/graphviz.rb', line 715

def self.default( hOpts )
  hOpts.each do |k, v|
    case k.to_s
      when "use"
        @@prog = v
      when "path"
        @@path = v.split( "," ).map{ |x| x.strip }
      when "errors"
        @@errors = v
      when "extlibs"
        @@extlibs = v.split( "," ).map{ |x| x.strip }
      else
        warn "Invalid option #{k}!"
    end
  end
end

+ (Object) libxslt_transform(xml, xsl) 



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# File 'lib/graphviz/nothugly.rb', line 54

def self.libxslt_transform(xml, xsl)
   LibXML::XML.default_load_external_dtd = false
   LibXML::XML.default_substitute_entities = false

   stylesheet_doc = LibXML::XML::Document.file(xsl)
   stylesheet = LibXSLT::XSLT::Stylesheet.new(stylesheet_doc)
   xml_doc = LibXML::XML::Document.file(xml)
   stylesheet.apply(xml_doc).to_s
end

+ (Object) nothugly(file, save = true)

Transform to pretty up the SVG output

For more information, see www.hokstad.com/making-graphviz-output-pretty-with-xsl.html and www.hokstad.com/making-graphviz-output-pretty-with-xsl-updated.html

You can use the :nothugly option to GraphViz#output :

graph.output( :svg => "myGraph.svg", :nothugly => true )

Or directly on an SVG output graph :

GraphViz.nothugly( "myGraph.svg" )


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# File 'lib/graphviz/nothugly.rb', line 33

def self.nothugly( file, save = true )
  xsl = File.join( File.dirname(File.expand_path(__FILE__)), "nothugly", "nothugly.xsl" )
  out = self.send(XSLT_METHOD, file, xsl)

  if save
    fname = File.join( File.dirname(File.expand_path(file)), File.basename(file))
    File.open( fname, "w" ) { |io|
      io.print out
    }
  else
    return out
  end
end

+ (Object) options(hOpts) 



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# File 'lib/graphviz.rb', line 732

def self.options( hOpts )
  GraphViz::default( hOpts )
end

+ (Object) parse(xFile, hOpts = {}) {|graph| ... }

Create a new graph from a GraphViz File

Options :

  • :output : Output format (GraphViz::Constants::FORMATS) (default : dot)

  • :file : Output file name (default : none)

  • :use : Program to use (GraphViz::Constants::PROGRAMS) (default : dot)

  • :path : Program PATH

Yields:

  • (graph) 


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# File 'lib/graphviz.rb', line 746

def self.parse( xFile, hOpts = {}, &block )
  graph = Dot2Ruby::new( hOpts[:path], nil, nil ).eval( xFile )
  yield( graph ) if( block and graph )
  return graph
end

+ (Object) parse_string(str, hOpts = {}) {|graph| ... }

Create a new graph from a GraphViz File

Options :

  • :output : Output format (GraphViz::Constants::FORMATS) (default : dot)

  • :file : Output file name (default : none)

  • :use : Program to use (GraphViz::Constants::PROGRAMS) (default : dot)

  • :path : Program PATH

Yields:

  • (graph) 


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# File 'lib/graphviz.rb', line 760

def self.parse_string( str, hOpts = {}, &block )
  graph = Dot2Ruby::new( hOpts[:path], nil, nil ).eval_string( str )
  yield( graph ) if( block and graph )
  return graph
end

+ (Object) xml_xslt_transform(xml, xsl) 



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# File 'lib/graphviz/nothugly.rb', line 47

def self.xml_xslt_transform(xml, xsl)
  xslt = XML::XSLT.new()
  xslt.xml = xml
  xslt.xsl = xsl
  xslt.serve()
end

Instance Method Details

- (Object) <<(oNode) Also known as: >, -, >>

Create an edge between the current cluster and the node or cluster oNode

Raises:

  • (ArgumentError) 


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# File 'lib/graphviz.rb', line 661

def <<( oNode )
  raise( ArgumentError, "Edge between root graph and node or cluster not allowed!" ) if self.pg.nil?

  if( oNode.class == Array )
    oNode.each do |no|
      self << no
    end
  else
    return GraphViz::commonGraph( oNode, self ).add_edges( self, oNode )
  end
end

- (Object) [](xAttrName)

Get the value of the graph attribute xAttrName



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# File 'lib/graphviz.rb', line 387

def []( xAttrName )
  if Hash === xAttrName
    xAttrName.each do |key, value|
      self[key] = value
    end
  else
    return( @graph[xAttrName].clone )
  end
end

- (Object) []=(xAttrName, xValue)

Set value xValue to the graph attribute xAttrName



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# File 'lib/graphviz.rb', line 379

def []=( xAttrName, xValue )
  xValue = xValue.to_s if xValue.class == Symbol
  @graph[xAttrName] = xValue
end

- (Object) add(h)

Add nodes and edges defined by a Hash



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# File 'lib/graphviz.rb', line 325

def add(h)
  if h.kind_of? Hash
    h.each do |node, data|
      add_hash_edge(node, data)
    end
  end
end

- (Object) add_edge(oNodeOne, oNodeTwo, hOpts = {}) 



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# File 'lib/graphviz.rb', line 184

def add_edge( oNodeOne, oNodeTwo, hOpts = {} )
  if oNodeTwo.kind_of? Array or oNodeOne.kind_of? Array 
    raise ArgumentError, "use `add_edges' to add several edges at the same time"
  end
  add_edges(oNodeOne, oNodeTwo, hOpts)
end

- (Object) add_edges(node_one, node_two, options = {})

Create a new edge

In:

  • node_one : First node (or node list)

  • node_two : Second Node (or node list)

  • options : Edge attributes



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# File 'lib/graphviz.rb', line 197

def add_edges( node_one, node_two, options = {} )

  if( node_one.class == Array )
    node_one.each do |no|
      add_edges( no, node_two, options )
    end
  else
    if( node_two.class == Array )
      node_two.each do |nt|
        add_edges( node_one, nt, options )
      end
    else
      edge = GraphViz::Edge::new( node_one, node_two, self )
      edge.index = @elements_order.size_of( "edge" )

      options.each do |xKey, xValue|
        edge[xKey.to_s] = xValue
      end

      @elements_order.push( {
        "type" => "edge",
        "value" => edge
      } )
      @loEdges.push( edge )

      return( edge )
    end
  end
end

- (Object) add_graph(xGraphName = nil, hOpts = {}, &block) Also known as: subgraph

Create a new graph

In:

  • xGraphName : Graph name

  • hOpts : Graph attributes



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# File 'lib/graphviz.rb', line 262

def add_graph( xGraphName = nil, hOpts = {}, &block )
   if xGraphName.kind_of?(GraphViz)
      xGraphID = xGraphName.id
      @hoGraphs[xGraphID] = xGraphName.clone
      @hoGraphs[xGraphID].type = @oGraphType
      @hoGraphs[xGraphID].pg = self
      xGraphName = xGraphID
   else
      if xGraphName.kind_of?(Hash)
         hOpts = xGraphName
         xGraphName = nil
      end

      if xGraphName.nil?
         xGraphID = String.random(11)
         xGraphName = ""
      else
         xGraphID = xGraphName
      end

      @hoGraphs[xGraphID] = GraphViz::new( xGraphName, {:parent => self, :type => @oGraphType}, &block )

      hOpts.each do |xKey, xValue|
         @hoGraphs[xGraphID][xKey.to_s] = xValue
      end
   end

   @elements_order.push( {
      "type" => "graph",
      "name" => xGraphName,
      "value" => @hoGraphs[xGraphID]
   } )

   return( @hoGraphs[xGraphID] )
end

- (Object) add_node(xNodeName, hOpts = {}) 



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# File 'lib/graphviz.rb', line 87

def add_node( xNodeName, hOpts = {} )
  if xNodeName.kind_of? Array
    raise ArgumentError, "use `add_nodes' to add several nodes at the same time"
  end
  return add_nodes(xNodeName, hOpts)
end

- (Object) add_nodes(node_name, options = {})

Create a new node

In:

  • xNodeName : Name of the new node

  • hOpts : Node attributes

Return the GraphViz::Node object created



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# File 'lib/graphviz.rb', line 101

def add_nodes(node_name, options = {})
   if node_name.kind_of? Array
      node_name.each { |n| add_nodes(n, options.clone) }
   else
      node = @hoNodes[node_name]

      if node.nil?
         @hoNodes[node_name] = GraphViz::Node::new( node_name, self )
         @hoNodes[node_name].index = @elements_order.size_of( "node" )

         unless options.keys.include?(:label) or options.keys.include?("label")
            options[:label] = node_name
         end

         @elements_order.push( {
            "type" => "node",
            "name" => node_name,
            "value" => @hoNodes[node_name]
         } )

         node = @hoNodes[node_name]
      end

      options.each do |xKey, xValue|
         @hoNodes[node_name][xKey.to_s] = xValue
      end

      return node
   end
end

- (Object) append_attributes_and_types(script) 



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# File 'lib/graphviz.rb', line 617

def append_attributes_and_types(script)
  script_data = DOTScriptData.new

  @elements_order.each { |kElement|
    p kElement["type"]
    is_new_type = script_data.type != kElement["type"]
    if is_new_type 
      script << script_data unless script_data.type.nil? or script_data.empty?
      script_data = DOTScriptData.new(kElement["type"])
    end

    # Modified by Brandon Coleman verify value is NOT NULL
    kElement["value"] or raise ArgumentError, "#{kElement["name"]} is nil!"

    case kElement["type"]
      when "graph_attr", "node_attr", "edge_attr"
        script_data.add_attribute(kElement["name"], kElement["value"].to_gv)
      when "node", "graph"
        script << kElement["value"].output()
      when "edge"
        script << "  " + kElement["value"].output( @oGraphType )
      else
        raise ArgumentError,
          "Don't know what to do with element type '#{kElement['type']}'"
    end
  }
  script << script_data unless script_data.type.nil? or script_data.empty?
end

- (Object) complete

Return a new completed graph



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# File 'lib/graphviz.rb', line 767

def complete
  GraphViz.parse_string( root_graph.output( :dot => String ) )
end

- (Object) complete!

Complete the current graph



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# File 'lib/graphviz.rb', line 772

def complete!
  # TODO: Keep options
  complete
end

- (Boolean) directed?

Return true if the graph is directed.

Returns:

  • (Boolean) 


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# File 'lib/graphviz.rb', line 778

def directed?
  not((/digraph/ =~ "bla digraph bla").nil?)
end

- (Object) each_attribut(&b) 



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# File 'lib/graphviz.rb', line 406

def each_attribut(&b)
   warn "`GraphViz#each_attribut` is deprecated, please use `GraphViz#each_attribute`"
   each_attribute(&b)
end

- (Object) each_attribute(&b)

Calls block once for each attribute of the graph, passing the name and value to the block as a two-element array.



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# File 'lib/graphviz.rb', line 401

def each_attribute(&b)
  @graph.each do |k,v|
    yield(k,v)
  end
end

- (Object) each_edge(&block)

Allow you to traverse edges



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# File 'lib/graphviz.rb', line 230

def each_edge( &block )
  if block_given?
    @loEdges.each do |edge|
      yield(edge)
    end
  else
    return @loEdges
  end
end

- (Object) each_graph(&block)

Allow you to traverse graphs



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# File 'lib/graphviz.rb', line 312

def each_graph( &block )
  if block_given?
    @hoGraphs.each do |name, graph|
      yield( name, graph )
    end
  else
    return @hoGraphs
  end
end

- (Object) each_node(&block)

Allow you to traverse nodes



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# File 'lib/graphviz.rb', line 169

def each_node( &block )
  if block_given?
    @hoNodes.each do |name, node|
      yield( name, node )
    end
  else
    return( @hoNodes )
  end
end

- (Object) edge_count

Get the number of edges



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# File 'lib/graphviz.rb', line 243

def edge_count
  @loEdges.size
end

- (Object) find_node(name)

Returns the first node found in the entire graph, starting from the root graph



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# File 'lib/graphviz.rb', line 142

def find_node(name)
   root = root_graph
   return root.search_node(name)
end

- (Object) get_edge_at_index(index)

Return the edge object for the given index



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# File 'lib/graphviz.rb', line 250

def get_edge_at_index( index )
  element = @elements_order[index, "edge"]
  (element.nil?) ? nil : element["value"]
end

- (Object) get_graph(xGraphName) {|graph| ... }

Return the graph object for the given name (or nil)

Yields:

  • (graph) 


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# File 'lib/graphviz.rb', line 301

def get_graph( xGraphName, &block )
  graph = @hoGraphs[xGraphName] || nil

  yield( graph ) if( block and graph )

  return graph
end

- (Object) get_node(xNodeName) {|node| ... }

Return the node object for the given name (or nil) in the current graph

Yields:

  • (node) 


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# File 'lib/graphviz.rb', line 133

def get_node( xNodeName, &block )
  node = @hoNodes[xNodeName] || nil

  yield( node ) if( block and node )

  return node
end

- (Object) get_node_at_index(index)

Return the node object for the given index



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# File 'lib/graphviz.rb', line 161

def get_node_at_index( index )
  element = @elements_order[index, "node"]
  (element.nil?) ? nil : element["value"]
end

- (Object) graph_attrs

This accessor allow you to set global graph attributes



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# File 'lib/graphviz.rb', line 75

def graph
  @graph
end

- (Object) graph_count

Get the number of graphs



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# File 'lib/graphviz.rb', line 346

def graph_count
  @hoGraphs.size
end

- (Boolean) has_parent_graph?

Returns:

  • (Boolean) 


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# File 'lib/graphviz.rb', line 782

def has_parent_graph?
   not @oParentGraph.nil?
end

- (Object) name Also known as: id

Get the graph name



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# File 'lib/graphviz.rb', line 653

def name
  @name.clone
end

- (Object) node_count

Get the number of nodes



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# File 'lib/graphviz.rb', line 180

def node_count
  @hoNodes.size
end

- (Object) output(hOpts = {}) Also known as: save

Generate the graph

Options :

  • :output : Output format (GraphViz::Constants::FORMATS)

  • :file : Output file name

  • :use : Program to use (GraphViz::Constants::PROGRAMS)

  • :path : Program PATH

  • :<format> => <file> : <file> can be

    • a file name

    • nil, then the output will be printed to STDOUT

    • String, then the output will be returned as a String

  • :errors : DOT error level (default 1)

    • 0 = Error + Warning

    • 1 = Error

    • 2 = none



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# File 'lib/graphviz.rb', line 435

def output( hOpts = {} )
  xDOTScript = DOTScript.new
  lNotHugly = []

  append_attributes_and_types(xDOTScript)

  xDOTScript << "}"

  if has_parent_graph?
    xDOTScript.make_subgraph("#{GraphViz.escape(@name, :unquote_empty => true)}")
  else
    hOutput = {}

    hOpts.each do |xKey, xValue|
      xValue = xValue.to_s unless xValue.nil? or [Class, TrueClass, FalseClass].include?(xValue.class)
      case xKey.to_s
        when "use"
          if PROGRAMS.index( xValue ).nil?
            raise ArgumentError, "can't use '#{xValue}'"
          end
          @prog = xValue
        when "path"
          @path = xValue && xValue.split( "," ).map{ |x| x.strip }
        when "errors"
          @errors = xValue
        when "extlib"
          @extlibs = xValue.split( "," ).map{ |x| x.strip }
        when "scale"
          # Scale input by 'v' (=72)
          @scale = xValue
        when "inverty"
          # Invert y coordinate in output
          @inverty = xValue
        when "no_layout"
          # No layout mode 'v' (=1)
          @no_layout = xValue
        when "reduce"
          # Reduce graph
          @reduce_graph = xValue
        when "Lg"
          # Don't use grid
          @Lg = xValue
        when "LO"
          # Use old attractive force
          @LO = xValue
        when "Ln"
          # Set number of iterations to i
          @Ln = xValue
        when "LU"
          # Set unscaled factor to i
          @LU = xValue
        when "LC"
          # Set overlap expansion factor to v
          @LC = xValue
        when "LT"
          # Set temperature (temperature factor) to v
          @LT = xValue
        when "nothugly"
          begin
            require 'graphviz/nothugly'
            @nothugly = true
          rescue LoadError
            warn "You must install ruby-xslt or libxslt-ruby to use nothugly option!"
            @nothugly = false
          end
        else
          if FORMATS.index( xKey.to_s ).nil?
            raise ArgumentError, "output format '#{xValue}' invalid"
          end
          hOutput[xKey.to_s] = xValue
      end
    end

    @output = hOutput if hOutput.size > 0

    xStict = ((@strict && @oGraphType == "digraph") ? "strict " : "")
    xDOTScript.prepend(
      "#{xStict}#{@oGraphType} #{GraphViz.escape(@name, :unquote_empty => true)} {"
    )

    xOutputString = (@filename == String ||
      @output.any? {|format, file| file == String })

    xOutput = ""
    if @format.to_s == "none" or @output.any? {|fmt, fn| fmt.to_s == "none"}
      if xOutputString
        xOutput << xDOTScript
      else
        xFileName = @output["none"] || @filename
        open( xFileName, "w" ) do |h|
          h.puts xDOTScript
        end
      end
    end

    if (@format.to_s != "none" and not @format.nil?) or (@output.any? {|format, file| format != "none" } and @output.size > 0)
      ## Act: Save script and send it to dot
      t = Tempfile::open( File.basename(__FILE__) )
      t.print( xDOTScript )
      t.close

      cmd = find_executable( @prog, @path )
      if cmd == nil
        raise StandardError, "GraphViz not installed or #{@prog} not in PATH. Install GraphViz or use the 'path' option"
      end

      cmd = escape_path_containing_blanks(cmd) if IS_JRUBY

      xOutputWithFile = ""
      xOutputWithoutFile = ""
      unless @format.nil? or @format == "none"
        lNotHugly << @filename if @format.to_s == "svg" and @nothugly
        if @filename.nil? or @filename == String
          xOutputWithoutFile = "-T#{@format} "
        else
          xOutputWithFile = "-T#{@format} -o#{@filename} "
        end
      end
      @output.each_except( :key => ["none"] ) do |format, file|
        lNotHugly << file if format.to_s == "svg" and @nothugly
        if file.nil? or file == String
          xOutputWithoutFile << "-T#{format} "
        else
          xOutputWithFile << "-T#{format} -o#{file} "
        end
      end

      xExternalLibraries = ""
      @extlibs.each do |lib|
        xExternalLibraries << "-l#{lib} "
      end

      xOtherOptions = ""
      xOtherOptions += " -s#{@scale}" unless @scale.nil?
      xOtherOptions += " -y" if @inverty
      unless @no_layout.nil?
        xOtherOptions += " -n"
        xOtherOptions += "2" if @no_layout.to_i == 2
      end
      xOtherOptions += " -x" if @reduce_graph
      xOtherOptions += " -Lg" if @Lg
      xOtherOptions += " -LO" if @LO
      xOtherOptions += " -Ln#{@Ln}" unless @Ln.nil?
      xOtherOptions += " -LU#{@LU}" unless @LU.nil?
      xOtherOptions += " -LC#{@LC}" unless @LC.nil?
      xOtherOptions += " -LT#{@LT}" unless @LT.nil?

      if IS_JRUBY
        xCmd = "#{cmd} -q#{@errors} #{xExternalLibraries} #{xOtherOptions} #{xOutputWithFile} #{xOutputWithoutFile} #{t.path}"
      elsif IS_CYGWIN
        tmpPath = t.path
        begin
          tmpPath = "'" + `cygpath -w #{t.path}`.chomp + "'"
        rescue
          warn "cygpath is not installed!"
        end
        xCmd = "\"#{cmd}\" -q#{@errors} #{xExternalLibraries} #{xOtherOptions} #{xOutputWithFile} #{xOutputWithoutFile} #{tmpPath}"
      else
        xCmd = "\"#{cmd}\" -q#{@errors} #{xExternalLibraries} #{xOtherOptions} #{xOutputWithFile} #{xOutputWithoutFile} #{t.path}"
      end

      xOutput << output_from_command( xCmd )
    end

    # Not Hugly
    lNotHugly.each do |f|
      if f.nil? or f == String
        xOutput = GraphViz.nothugly( xOutput, false )
      else
        GraphViz.nothugly( f, true )
      end
    end

    if xOutputString
      xOutput
    else
      print xOutput
    end
  end
end

- (Object) pg

:nodoc:



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# File 'lib/graphviz.rb', line 676

def pg #:nodoc:
  @oParentGraph
end

- (Object) pg=(x)

:nodoc:



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# File 'lib/graphviz.rb', line 679

def pg=(x) #:nodoc:
  @oParentGraph = x
end

- (Object) root_graph

Return the root graph



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# File 'lib/graphviz.rb', line 686

def root_graph
  return( (self.pg.nil?) ? self : self.pg.root_graph )
end

- (Object) search_node(name)

Return the first node found in the current graph, and it subgraphs



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# File 'lib/graphviz.rb', line 148

def search_node(name)
   n = get_node(name)
   return n unless n.nil?
   each_graph { |_, g|
      n = g.search_node(name)
      return n unless n.nil?
   }
   return nil
end

- (Object) set_position(xType, xKey, xValue)

:nodoc:



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# File 'lib/graphviz.rb', line 702

def set_position( xType, xKey, xValue ) #:nodoc:
  @elements_order.push( {
    "type" => "#{xType}_attr",
    "name" => xKey,
    "value" => xValue
  } )
end

- (Object) to_graph

Create a new graph from the current subgraph



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# File 'lib/graphviz.rb', line 412

def to_graph
  graph = self.clone
  graph.pg = nil
  return graph
end

- (Object) to_s 



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# File 'lib/graphviz.rb', line 646

def to_s
  self.output(:none => String)
end

- (Object) type

Return the graph type (graph digraph)



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# File 'lib/graphviz.rb', line 336

def type
  @oGraphType
end

- (Object) type=(x)

:nodoc:



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# File 'lib/graphviz.rb', line 339

def type=(x) #:nodoc:
  @oGraphType = x
end