code: func (f *Fpdf) Text(x, y float64, txtStr string) {
  	s := sprintf("BT %.2f %.2f Td (%s) Tj ET", x*f.k, (f.h-y)*f.k, f.escape(txtStr))
  	if f.underline && txtStr != "" {
  		s += " " + f.dounderline(x, y, txtStr)
  	}
  	if f.colorFlag {
  		s = sprintf("q %s %s Q", f.color.text.str, s)
  	}
  	f.out(s)
  }
docs: // Text prints a character string. The origin (x, y) is on the left of the
  // first character at the baseline. This method permits a string to be placed
  // precisely on the page, but it is usually easier to use Cell(), MultiCell()
  // or Write() which are the standard methods to print text.