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