A graph representation. Whether or not it is rendered as directed or undirected depends on which of the programs dot or neato is used to process and render the graph.
Creates a new Graph with the params Hash providing settings for all graph options. The option_list parameter restricts those options to the list of valid names it contains. The exception to this is the elements option which, if specified, must be an Enumerable containing a list of nodes, edges, and/or subgraphs.
# File lib/rgl/rdot.rb, line 290 def initialize (params = {}, option_list = GRAPH_OPTS) super(params, option_list) @elements = params['elements'] ? params['elements'] : [] @dot_string = 'graph' end
Adds a new node, edge, or subgraph to this graph.
# File lib/rgl/rdot.rb, line 312 def << (element) @elements << element self end
Calls block once for each node, edge, or subgraph contained by this graph, passing the node, edge, or subgraph to the block.
# File lib/rgl/rdot.rb, line 302 def each_element (&block) @elements.each(&block) self end
Removes the most recently added node, edge, or subgraph from this graph and returns it.
# File lib/rgl/rdot.rb, line 324 def pop @elements.pop end
Returns a string representation of this graph which is consumable by the graphviz tools dot and neato. The leader parameter is used to indent every line of the returned string, and the indent parameter is used to additionally indent nested items.
# File lib/rgl/rdot.rb, line 332 def to_s (leader = '', indent = ' ') hdr = leader + @dot_string + (@name.nil? ? '' : ' ' + quote_ID(@name)) + " {\n" options = @options.to_a.collect do |name, val| unless val.nil? then if name == 'label' then leader + indent + "#{quote_ID(name)} = #{quote_label(val)}" else leader + indent + "#{quote_ID(name)} = #{quote_ID(val)}" end end end.compact.join( "\n" ) elements = @elements.collect do |element| element.to_s(leader + indent, indent) end.join("\n\n") hdr + (options.empty? ? '' : options + "\n\n") + (elements.empty? ? '' : elements + "\n") + leader + "}" end
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