Transparency

This script gives transparency support

Informations

Author: Martin Hall-May
License: FPDF

Description

This script gives transparency support. You can set the alpha channel from 0 (fully transparent) to 1 (fully opaque). It applies to all elements (text, drawings, images).

Source

<?php require('fpdf.php'); class AlphaPDF extends FPDF { var $extgstates = array(); // alpha: real value from 0 (transparent) to 1 (opaque) // bm: blend mode, one of the following: // Normal, Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn, // HardLight, SoftLight, Difference, Exclusion, Hue, Saturation, Color, Luminosity function SetAlpha($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->_out('<</Type /ExtGState'); $parms = $this->extgstates[$i]['parms']; $this->_out(sprintf('/ca %.3F', $parms['ca'])); $this->_out(sprintf('/CA %.3F', $parms['CA'])); $this->_out('/BM '.$parms['BM']); $this->_out('>>'); $this->_out('endobj'); } } function _putresourcedict() { parent::_putresourcedict(); $this->_out('/ExtGState <<'); foreach($this->extgstates as $k=>$extgstate) $this->_out('/GS'.$k.' '.$extgstate['n'].' 0 R'); $this->_out('>>'); } function _putresources() { $this->_putextgstates(); parent::_putresources(); } } ?>

Example

<?php require('alphapdf.php'); $pdf = new AlphaPDF(); $pdf->AddPage(); $pdf->SetLineWidth(1.5); // draw opaque red square $pdf->SetFillColor(255, 0, 0); $pdf->Rect(10, 10, 40, 40, 'DF'); // set alpha to semi-transparency $pdf->SetAlpha(0.5); // draw green square $pdf->SetFillColor(0, 255, 0); $pdf->Rect(20, 20, 40, 40, 'DF'); // draw jpeg image $pdf->Image('lena.jpg', 30, 30, 40); // restore full opacity $pdf->SetAlpha(1); // print name $pdf->SetFont('Arial', '', 12); $pdf->Text(46, 68, 'Lena'); $pdf->Output(); ?>
View the result here.

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Quelle

http://www.fpdf.org/en/script/script74.php, zuletzt abgerufen 30.03.2016 02:01