# File lib/puppet/simple_graph.rb, line 431
431:   def write_to_graphic_file (fmt='png', dotfile='graph')
432:     src = dotfile + '.dot'
433:     dot = dotfile + '.' + fmt
434: 
435:     File.open(src, 'w') {|f| f << self.to_dot << "\n"}
436: 
437:     system( "dot -T#{fmt} #{src} -o #{dot}" )
438:     dot
439:   end