public function getLineHeight()
    {
        $val = $this->value['line-height'];
        if ($val=='normal') $val = '108%';
        return $this->convertToMM($val, $this->value['font-size']);
    }
public function getLineHeight()
    {
        $val = $this->value['line-height'];
        if ($val=='normal') $val = '108%';
        return $this->convertToMM($val, $this->value['font-size']);
    }
public function getLineHeight ( ) { $ val = $ this -> value [ 'line-height' ] ; if ( $ val == 'normal' ) $ val = '108%' ; return $ this -> convertToMM ( $ val , $ this -> value [ 'font-size' ] ) ; }
get the height of the current line

@access public
@return float $height in mm
get the height of the current line