subgraph element is the same to graph, but has another header in dot notation
# File rdoc/dot.rb, line 193 def << ( thing ) @nodes << thing end
# File rdoc/dot.rb, line 189 def each_node @nodes.each{ |i| yield i } end
# File rdoc/dot.rb, line 197 def push( thing ) @nodes.push( thing ) end
# File rdoc/dot.rb, line 205 def to_s( t = '' ) hdr = t + "#{@dot_string} #{@name} {\n" options = @options.to_a.collect{ |name, val| val && name != 'label' ? t + TAB + "#{name} = #{val}" : name ? t + TAB + "#{name} = \"#{val}\"" : nil }.compact.join( "\n" ) + "\n" nodes = @nodes.collect{ |i| i.to_s( t + TAB ) }.join( "\n" ) + "\n" hdr + options + nodes + t + "}\n" end