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<?php |
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/** |
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* @author: Martin Hall-May <[email protected]?subject=Transparency> |
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*/ |
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namespace Royopa\AlphaPDF; |
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class AlphaPDF extends Fpdi |
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{ |
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protected $extgstates = array(); |
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protected $angle = 0; |
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protected $PDFVersion = 1.4; |
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// alpha: real value from 0 (transparent) to 1 (opaque) |
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// bm: blend mode, one of the following: |
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// Normal, Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn, |
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// HardLight, SoftLight, Difference, Exclusion, Hue, Saturation, Color, Luminosity |
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public function SetAlpha($alpha, $bm='Normal') |
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{ |
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// set alpha for stroking (CA) and non-stroking (ca) operations |
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$gs = $this->AddExtGState(array('ca'=>$alpha, 'CA'=>$alpha, 'BM'=>'/'.$bm)); |
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$this->SetExtGState($gs); |
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} |
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public function AddExtGState($parms) |
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{ |
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$n = count($this->extgstates)+1; |
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$this->extgstates[$n]['parms'] = $parms; |
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return $n; |
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} |
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public function SetExtGState($gs) |
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{ |
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$this->_out(sprintf('/GS%d gs', $gs)); |
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} |
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public function _enddoc() |
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{ |
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if(!empty($this->extgstates) && $this->PDFVersion<'1.4') |
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$this->PDFVersion='1.4'; |
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parent::_enddoc(); |
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} |
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public function _putextgstates() |
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{ |
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$counter = count($this->extgstates); |
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for ($i = 1; $i <= $counter; $i++) |
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{ |
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$this->_newobj(); |
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$this->extgstates[$i]['n'] = $this->n; |
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$this->_out('<</Type /ExtGState'); |
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foreach ($this->extgstates[$i]['parms'] as $k=>$v) |
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$this->_out('/'.$k.' '.$v); |
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$this->_out('>>'); |
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$this->_out('endobj'); |
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} |
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} |
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public function _putresourcedict() |
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{ |
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parent::_putresourcedict(); |
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$this->_out('/ExtGState <<'); |
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foreach($this->extgstates as $k=>$extgstate) |
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$this->_out('/GS'.$k.' '.$extgstate['n'].' 0 R'); |
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$this->_out('>>'); |
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} |
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public function _putresources() |
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{ |
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$this->_putextgstates(); |
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parent::_putresources(); |
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} |
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} |
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royopa /
alphapdf
