Файл: library/Zend/Pdf/Resource/GraphicsState.php
Строк: 173
<?php
/**
* Zend Framework
*
* LICENSE
*
* This source file is subject to the new BSD license that is bundled
* with this package in the file LICENSE.txt.
* It is also available through the world-wide-web at this URL:
* http://framework.zend.com/license/new-bsd
* If you did not receive a copy of the license and are unable to
* obtain it through the world-wide-web, please send an email
* to license@zend.com so we can send you a copy immediately.
*
* @category Zend
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
* @version $Id: Image.php 20096 2010-01-06 02:05:09Z bkarwin $
*/
/** Internally used classes */
require_once 'Zend/Pdf/Element/Object.php';
require_once 'Zend/Pdf/Element/Dictionary.php';
require_once 'Zend/Pdf/Element/Name.php';
require_once 'Zend/Pdf/Element/Numeric.php';
/** Zend_Pdf_Resource */
require_once 'Zend/Pdf/Resource.php';
/**
* Graphics State.
*
* While some parameters in the graphics state can be set with individual operators,
* as shown in Table 4.7, others cannot. The latter can only be set with the generic
* graphics state operator gs (PDF 1.2).
*
* @package Zend_Pdf
* @copyright Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)
* @license http://framework.zend.com/license/new-bsd New BSD License
*/
class Zend_Pdf_Resource_GraphicsState extends Zend_Pdf_Resource
{
/**
* Object constructor.
*
* @param Zend_Pdf_Element_Object $extGStateObject
* @throws Zend_Pdf_Exception
*/
public function __construct(Zend_Pdf_Element_Object $extGStateObject = null)
{
if ($extGStateObject == null) {
// Create new Graphics State object
require_once 'Zend/Pdf/ElementFactory.php';
$factory = Zend_Pdf_ElementFactory::createFactory(1);
$gsDictionary = new Zend_Pdf_Element_Dictionary();
$gsDictionary->Type = new Zend_Pdf_Element_Name('ExtGState');
$extGStateObject = $factory->newObject($gsDictionary);
}
if ($extGStateObject->getType() != Zend_Pdf_Element::TYPE_DICTIONARY) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Graphics state PDF object must be a dictionary');
}
parent::__construct($gsDictionary);
}
/**
* Set the transparancy
*
* $alpha == 0 - transparent
* $alpha == 1 - opaque
*
* Transparency modes, supported by PDF:
* Normal (default), Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn, HardLight,
* SoftLight, Difference, Exclusion
*
* @param float $alpha
* @param string $mode
* @throws Zend_Pdf_Exception
* @return Zend_Pdf_Canvas_Interface
*/
public function setAlpha($alpha, $mode = 'Normal')
{
if (!in_array($mode, array('Normal', 'Multiply', 'Screen', 'Overlay', 'Darken', 'Lighten', 'ColorDodge',
'ColorBurn', 'HardLight', 'SoftLight', 'Difference', 'Exclusion'))) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Unsupported transparency mode.');
}
if (!is_numeric($alpha) || $alpha < 0 || $alpha > 1) {
require_once 'Zend/Pdf/Exception.php';
throw new Zend_Pdf_Exception('Alpha value must be numeric between 0 (transparent) and 1 (opaque).');
}
$this->_resource->BM = new Zend_Pdf_Element_Name($mode);
$this->_resource->CA = new Zend_Pdf_Element_Numeric($alpha);
$this->_resource->ca = new Zend_Pdf_Element_Numeric($alpha);
}
/** @todo add other Graphics State features support */
}