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forked from s421507/eOSP2
eOSP2/app/Http/Controllers/AlphaPDF.php
2020-02-01 01:03:57 +01:00

74 lines
2.0 KiB
PHP

<?php
namespace App\Http\Controllers;
use Codedge\Fpdf\Fpdf\Fpdf;
class AlphaPDF extends FPDF
{
protected $extgstates = array();
// alpha: real value from 0 (transparent) to 1 (opaque)
// bm: blend mode, one of the following:
// Normal, Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn,
// HardLight, SoftLight, Difference, Exclusion, Hue, Saturation, Color, Luminosity
function SetAlpha($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);
}
function AddExtGState($parms)
{
$n = count($this->extgstates)+1;
$this->extgstates[$n]['parms'] = $parms;
return $n;
}
function SetExtGState($gs)
{
$this->_out(sprintf('/GS%d gs', $gs));
}
function _enddoc()
{
if(!empty($this->extgstates) && $this->PDFVersion<'1.4')
$this->PDFVersion='1.4';
parent::_enddoc();
}
function _putextgstates()
{
for ($i = 1; $i <= count($this->extgstates); $i++)
{
$this->_newobj();
$this->extgstates[$i]['n'] = $this->n;
$this->_put('<</Type /ExtGState');
$parms = $this->extgstates[$i]['parms'];
$this->_put(sprintf('/ca %.3F', $parms['ca']));
$this->_put(sprintf('/CA %.3F', $parms['CA']));
$this->_put('/BM '.$parms['BM']);
$this->_put('>>');
$this->_put('endobj');
}
}
function _putresourcedict()
{
parent::_putresourcedict();
$this->_put('/ExtGState <<');
foreach($this->extgstates as $k=>$extgstate)
$this->_put('/GS'.$k.' '.$extgstate['n'].' 0 R');
$this->_put('>>');
}
function _putresources()
{
$this->_putextgstates();
parent::_putresources();
}
}
?>