code: def method2png(output, mx, raw=False):
      
      buff = raw
      if not raw:
          buff = method2dot(mx)
  
      method2format(output, "png", mx, buff)
docs: Export method to a png file format
  
      :param output: output filename
      :type output: string
      :param mx: specify the MethodAnalysis object
      :type mx: :class:`MethodAnalysis` object
      :param raw: use directly a dot raw buffer
      :type raw: string