code: func (f *Fpdf) UnitToPointConvert(u float64) (pt float64) {
  	return u * f.k
  }
docs: // UnitToPointConvert returns the value of u, expressed in the unit of measure
  // specified in New(), as a value expressed in points (1/72 inch). Since font
  // management in Fpdf uses points, this method can help with setting font sizes
  // based on the sizes of other non-font page elements.