code: func Scale(x uint, y uint) OptionsFunc {
  	return func(w *Waveform) error {
  		return w.setScale(x, y)
  	}
  }
docs: // Scale generates an OptionsFunc which applies the input X and Y axis scaling
  // factors to an input Waveform struct.
  //
  // This value indicates how a generated waveform image will be scaled, for both
  // its X and Y axes.