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109 lines
3.8 KiB
109 lines
3.8 KiB
<?php
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/**
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* Zend Framework
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*
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* LICENSE
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*
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* This source file is subject to the new BSD license that is bundled
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* with this package in the file LICENSE.txt.
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* It is also available through the world-wide-web at this URL:
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* http://framework.zend.com/license/new-bsd
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* If you did not receive a copy of the license and are unable to
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* obtain it through the world-wide-web, please send an email
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* to license@zend.com so we can send you a copy immediately.
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*
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* @category Zend
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* @package Zend_Pdf
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* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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* @version $Id: Image.php 20096 2010-01-06 02:05:09Z bkarwin $
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*/
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/** Internally used classes */
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// require_once 'Zend/Pdf/Element/Object.php';
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// require_once 'Zend/Pdf/Element/Dictionary.php';
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// require_once 'Zend/Pdf/Element/Name.php';
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// require_once 'Zend/Pdf/Element/Numeric.php';
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/** Zend_Pdf_Resource */
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// require_once 'Zend/Pdf/Resource.php';
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/**
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* Graphics State.
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*
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* While some parameters in the graphics state can be set with individual operators,
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* as shown in Table 4.7, others cannot. The latter can only be set with the generic
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* graphics state operator gs (PDF 1.2).
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*
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* @package Zend_Pdf
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* @copyright Copyright (c) 2005-2014 Zend Technologies USA Inc. (http://www.zend.com)
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* @license http://framework.zend.com/license/new-bsd New BSD License
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*/
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class Zend_Pdf_Resource_GraphicsState extends Zend_Pdf_Resource
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{
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/**
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* Object constructor.
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*
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* @param Zend_Pdf_Element_Object $extGStateObject
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* @throws Zend_Pdf_Exception
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*/
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public function __construct(Zend_Pdf_Element_Object $extGStateObject = null)
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{
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if ($extGStateObject == null) {
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// Create new Graphics State object
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// require_once 'Zend/Pdf/ElementFactory.php';
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$factory = Zend_Pdf_ElementFactory::createFactory(1);
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$gsDictionary = new Zend_Pdf_Element_Dictionary();
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$gsDictionary->Type = new Zend_Pdf_Element_Name('ExtGState');
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$extGStateObject = $factory->newObject($gsDictionary);
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}
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if ($extGStateObject->getType() != Zend_Pdf_Element::TYPE_DICTIONARY) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Graphics state PDF object must be a dictionary');
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}
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parent::__construct($gsDictionary);
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}
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/**
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* Set the transparancy
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*
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* $alpha == 0 - transparent
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* $alpha == 1 - opaque
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*
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* Transparency modes, supported by PDF:
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* Normal (default), Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn, HardLight,
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* SoftLight, Difference, Exclusion
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*
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* @param float $alpha
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* @param string $mode
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* @throws Zend_Pdf_Exception
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* @return Zend_Pdf_Canvas_Interface
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*/
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public function setAlpha($alpha, $mode = 'Normal')
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{
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if (!in_array($mode, array('Normal', 'Multiply', 'Screen', 'Overlay', 'Darken', 'Lighten', 'ColorDodge',
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'ColorBurn', 'HardLight', 'SoftLight', 'Difference', 'Exclusion'))) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Unsupported transparency mode.');
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}
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if (!is_numeric($alpha) || $alpha < 0 || $alpha > 1) {
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// require_once 'Zend/Pdf/Exception.php';
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throw new Zend_Pdf_Exception('Alpha value must be numeric between 0 (transparent) and 1 (opaque).');
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}
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$this->_resource->BM = new Zend_Pdf_Element_Name($mode);
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$this->_resource->CA = new Zend_Pdf_Element_Numeric($alpha);
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$this->_resource->ca = new Zend_Pdf_Element_Numeric($alpha);
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}
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/** @todo add other Graphics State features support */
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}
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