Ruby code using GraphViz

GraphViz_width_problem.rb

# this is a Ruby comment

  def graph_node(n, parent=nil, depth=0)
    #print n, " "
    gn = @g.add_node(n.object_id.to_s, :label=>n.to_graphviz, :shape=>"Mrecord")
    if parent
      e = @g.add_edge(parent, gn)
    end
    if n == @current_pos_node
      gn[:color] = "brown3"
      gn[:style] = "filled"
    elsif @s.tree.pv(@current_pos_node).include?(n)
      gn[:color] = "cadetblue"
      gn[:style] = "filled"
    elsif @s.tree.pv(@root).include?(n)
      gn[:color] = "yellow"
      gn[:style] = "filled"
    end
    return if !n.children # or depth == 2
    i = 0
    for c in n.children
      graph_node(c, gn, depth+1)
      i += 1
      #break if i > 2
    end
  end

  def graph(name="tree", root_node=@current_pos_node)
    @g = GraphViz::new("G")
    #@g['sep'] = "10,100"
    #@g["overlap"] = "compress"
    #@g["rankdir"] = "BT"
    #@g["ratio"] = "0.9"
    @g["size"] = "350,500"
    graph_node(root_node)
    @g.output(:svg => "#{name}.svg")
  end