Royopa\AlphaPDF\AlphaPDF

Complexity

Total Complexity

12

Size/Duplication

Total Lines	64
Duplicated Lines	0 %

Importance

Changes	1
Bugs	0	Features	0

7 Methods

Rating	Name	Duplication	Size	Complexity
A	SetExtGState()	0	3	1
A	AddExtGState()	0	5	1
A	SetAlpha()	0	5	1
A	_putextgstates()	0	12	3
A	_putresources()	0	4	1
A	_putresourcedict()	0	7	2
A	_enddoc()	0	5	3

<?php
/**
 * @author: Martin Hall-May <djmanmaster@gmx.net?subject=Transparency>
 */

namespace Royopa\AlphaPDF;

class AlphaPDF extends Fpdi
{
    protected $extgstates = array();
    protected $angle = 0;
    protected $PDFVersion = 1.4;

    // alpha: real value from 0 (transparent) to 1 (opaque)
    // bm:    blend mode, one of the following:
    //          Normal, Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn,
    //          HardLight, SoftLight, Difference, Exclusion, Hue, Saturation, Color, Luminosity
    public function SetAlpha($alpha, $bm='Normal')
    {
        // set alpha for stroking (CA) and non-stroking (ca) operations
        $gs = $this->AddExtGState(array('ca'=>$alpha, 'CA'=>$alpha, 'BM'=>'/'.$bm));
        $this->SetExtGState($gs);
    }

    public function AddExtGState($parms)
    {
        $n = count($this->extgstates)+1;
        $this->extgstates[$n]['parms'] = $parms;
        return $n;
    }

    public function SetExtGState($gs)
    {
        $this->_out(sprintf('/GS%d gs', $gs));
    }

    public function _enddoc()
    {
        if(!empty($this->extgstates) && $this->PDFVersion<'1.4')
            $this->PDFVersion='1.4';
        parent::_enddoc();
    }

    public function _putextgstates()
    {
		$counter = count($this->extgstates); 
		for ($i = 1; $i <= $counter; $i++)
        {
            $this->_newobj();
            $this->extgstates[$i]['n'] = $this->n;
            $this->_out('<</Type /ExtGState');
            foreach ($this->extgstates[$i]['parms'] as $k=>$v)
                $this->_out('/'.$k.' '.$v);
            $this->_out('>>');
            $this->_out('endobj');
        }
    }

    public function _putresourcedict()
    {
        parent::_putresourcedict();
        $this->_out('/ExtGState <<');
        foreach($this->extgstates as $k=>$extgstate)
            $this->_out('/GS'.$k.' '.$extgstate['n'].' 0 R');
        $this->_out('>>');
    }

    public function _putresources()
    {
        $this->_putextgstates();
        parent::_putresources();
    }
}