Spot colors

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

class PDF_SpotColor extends FPDF
{
    protected $SpotColors = array();

    function AddSpotColor($name, $c, $m, $y, $k)
    {
        if(!isset($this->SpotColors[$name]))
        {
            $i = count($this->SpotColors)+1;
            $this->SpotColors[$name] = array('i'=>$i, 'c'=>$c, 'm'=>$m, 'y'=>$y, 'k'=>$k);
        }
    }

    function SetDrawSpotColor($name, $tint=100)
    {
        if(!isset($this->SpotColors[$name]))
            $this->Error('Undefined spot color: '.$name);
        $this->DrawColor = sprintf('/CS%d CS %.3F SCN', $this->SpotColors[$name]['i'], $tint/100);
        if($this->page>0)
            $this->_out($this->DrawColor);
    }

    function SetFillSpotColor($name, $tint=100)
    {
        if(!isset($this->SpotColors[$name]))
            $this->Error('Undefined spot color: '.$name);
        $this->FillColor = sprintf('/CS%d cs %.3F scn', $this->SpotColors[$name]['i'], $tint/100);
        $this->ColorFlag = ($this->FillColor!=$this->TextColor);
        if($this->page>0)
            $this->_out($this->FillColor);
    }

    function SetTextSpotColor($name, $tint=100)
    {
        if(!isset($this->SpotColors[$name]))
            $this->Error('Undefined spot color: '.$name);
        $this->TextColor = sprintf('/CS%d cs %.3F scn', $this->SpotColors[$name]['i'], $tint/100);
        $this->ColorFlag = ($this->FillColor!=$this->TextColor);
    }

    function _putspotcolors()
    {
        foreach($this->SpotColors as $name=>$color)
        {
            $this->_newobj();
            $this->_put('[/Separation /'.str_replace(' ','#20',$name));
            $this->_put('/DeviceCMYK <<');
            $this->_put('/Range [0 1 0 1 0 1 0 1] /C0 [0 0 0 0] ');
            $this->_put(sprintf('/C1 [%.3F %.3F %.3F %.3F] ',$color['c']/100,$color['m']/100,$color['y']/100,$color['k']/100));
            $this->_put('/FunctionType 2 /Domain [0 1] /N 1>>]');
            $this->_put('endobj');
            $this->SpotColors[$name]['n'] = $this->n;
        }
    }

    function _putresourcedict()
    {
        parent::_putresourcedict();
        $this->_put('/ColorSpace <<');
        foreach($this->SpotColors as $color)
            $this->_put('/CS'.$color['i'].' '.$color['n'].' 0 R');
        $this->_put('>>');
    }

    function _putresources()
    {
        $this->_putspotcolors();
        parent::_putresources();
    }
}
?>

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

$pdf = new PDF_SpotColor();
$pdf->AddSpotColor('PANTONE 145 CVC', 0, 42, 100, 25);
$pdf->AddPage();
$pdf->SetFillSpotColor('PANTONE 145 CVC');
$pdf->Rect(80, 40, 50, 50, 'F');
$pdf->Output();
?>