code: func (f *Fpdf) GetDrawSpotColor() (name string, c, m, y, k byte) {
  	return f.returnSpotColor(f.color.draw)
  }
docs: // GetDrawSpotColor returns the most recently used spot color information for
  // drawing. This will not be the current drawing color if some other color type
  // such as RGB is active. If no spot color has been set for drawing, zero
  // values are returned.