Tcpdf add custom text watermark

Tcpdf-Watermark

<?php
require('Pdf.php');
class PDF_Rotate extends Pdf
{
	var $angle=0;
	function Header()
    {
        //Put the watermark
        $this->SetFont('','B',40);
        $this->SetTextColor( 165, 203, 73 );
        $this->RotatedText(10,190,'It is under comapny name proprietor. ',45);
    }
	function Rotate($angle,$x=-1,$y=-1)
	{
		if($x==-1)
			$x=$this->x;
		if($y==-1)
			$y=$this->y;
		if($this->angle!=0)
			$this->_out('Q');
		$this->angle=$angle;
		if($angle!=0)
		{
			$angle*=M_PI/180;
			$c=cos($angle);
			$s=sin($angle);
			$cx=$x*$this->k;
			$cy=($this->h-$y)*$this->k;
			$this->_out(sprintf('q %.5F %.5F %.5F %.5F %.2F %.2F cm 1 0 0 1 %.2F %.2F cm',$c,$s,-$s,$c,$cx,$cy,-$cx,-$cy));
		}
	}

	function RotatedText($x, $y, $txt, $angle)
	{
		//Text rotated around its origin
		$this->Rotate($angle,$x,$y);
		$this->Text($x,$y,$txt);
		$this->Rotate(0);
	}

	function _endpage()
	{
		if($this->angle!=0)
		{
			$this->angle=0;
			$this->_out('Q');
		}
		parent::_endpage();
	}
}
$pdf= new PDF_Rotate();   
?>

where is 'Pdf.php ?

@wuminmin You need to add the TcPDF library to your project and you will see the file there.