Text rotations

<?php
require('fpdf.php');

class RPDF extends FPDF {

function TextWithDirection($x, $y, $txt, $direction='R')
{
    if ($direction=='R')
        $s=sprintf('BT %.2F %.2F %.2F %.2F %.2F %.2F Tm (%s) Tj ET',1,0,0,1,$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
    elseif ($direction=='L')
        $s=sprintf('BT %.2F %.2F %.2F %.2F %.2F %.2F Tm (%s) Tj ET',-1,0,0,-1,$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
    elseif ($direction=='U')
        $s=sprintf('BT %.2F %.2F %.2F %.2F %.2F %.2F Tm (%s) Tj ET',0,1,-1,0,$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
    elseif ($direction=='D')
        $s=sprintf('BT %.2F %.2F %.2F %.2F %.2F %.2F Tm (%s) Tj ET',0,-1,1,0,$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
    else
        $s=sprintf('BT %.2F %.2F Td (%s) Tj ET',$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
    if ($this->ColorFlag)
        $s='q '.$this->TextColor.' '.$s.' Q';
    $this->_out($s);
}

function TextWithRotation($x, $y, $txt, $txt_angle, $font_angle=0)
{
    $font_angle+=90+$txt_angle;
    $txt_angle*=M_PI/180;
    $font_angle*=M_PI/180;

    $txt_dx=cos($txt_angle);
    $txt_dy=sin($txt_angle);
    $font_dx=cos($font_angle);
    $font_dy=sin($font_angle);

    $s=sprintf('BT %.2F %.2F %.2F %.2F %.2F %.2F Tm (%s) Tj ET',$txt_dx,$txt_dy,$font_dx,$font_dy,$x*$this->k,($this->h-$y)*$this->k,$this->_escape($txt));
    if ($this->ColorFlag)
        $s='q '.$this->TextColor.' '.$s.' Q';
    $this->_out($s);
}

}
?>

<?php
require('rpdf.php');

$pdf=new RPDF();
$pdf->AddPage();
$pdf->SetFont('Arial','',40);
$pdf->TextWithRotation(50,65,'Hello',45,-45);
$pdf->SetFontSize(30);
$pdf->TextWithDirection(110,50,'world!','L');
$pdf->TextWithDirection(110,50,'world!','U');
$pdf->TextWithDirection(110,50,'world!','R');
$pdf->TextWithDirection(110,50,'world!','D');
$pdf->Output();
?>