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 <?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) 2005-2015 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) 2005-2015 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 */
 }