PhpOffice\PhpPresentation\DocumentLayout::convertUnit PHP Method

    protected function convertUnit($value, $fromUnit, $toUnit)
    {
        // Convert from $fromUnit to EMU
        switch ($fromUnit) {
            case self::UNIT_MILLIMETER:
                $value *= 36000;
                break;
            case self::UNIT_CENTIMETER:
                $value *= 360000;
                break;
            case self::UNIT_INCH:
                $value *= 914400;
                break;
            case self::UNIT_PIXEL:
                $value = Drawing::pixelsToEmu($value);
                break;
            case self::UNIT_POINT:
                $value *= 12700;
                break;
            case self::UNIT_EMU:
            default:
                // no changes
        }
        // Convert from EMU to $toUnit
        switch ($toUnit) {
            case self::UNIT_MILLIMETER:
                $value /= 36000;
                break;
            case self::UNIT_CENTIMETER:
                $value /= 360000;
                break;
            case self::UNIT_INCH:
                $value /= 914400;
                break;
            case self::UNIT_PIXEL:
                $value = Drawing::emuToPixels($value);
                break;
            case self::UNIT_POINT:
                $value /= 12700;
                break;
            case self::UNIT_EMU:
            default:
                // no changes
        }
        return $value;
    }