code: def to_latex(circuit, settings=None):
      
      if settings is None:
          settings = get_default_settings()
      text = header(settings)
      text += body(circuit, settings)
      text += footer()
      return text
docs: Translates a given pyquil Program to a TikZ picture in a Latex document.
  
      :param Program circuit: The circuit to be drawn, represented as a pyquil program.
      :param dict settings: An optional dictionary with settings for drawing the circuit. See `get_default_settings`
       in `latex_config` for more information about what settings should contain.
      :return: LaTeX document string which can be compiled.
      :rtype: string