1 <?php

     2 /**

     3  * Zend Framework

     4  *

     5  * LICENSE

     6  *

     7  * This source file is subject to the new BSD license that is bundled

     8  * with this package in the file LICENSE.txt.

     9  * It is also available through the world-wide-web at this URL:

    10  * http://framework.zend.com/license/new-bsd

    11  * If you did not receive a copy of the license and are unable to

    12  * obtain it through the world-wide-web, please send an email

    13  * to license@zend.com so we can send you a copy immediately.

    14  *

    15  * @category   Zend

    16  * @package    Zend_Pdf

    17  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    18  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    19  * @version    $Id: Image.php 20096 2010-01-06 02:05:09Z bkarwin $

    20  */

    21 

    22 

    23 /** Internally used classes */

    24 require_once 'Zend/Pdf/Element/Object.php';

    25 require_once 'Zend/Pdf/Element/Dictionary.php';

    26 require_once 'Zend/Pdf/Element/Name.php';

    27 require_once 'Zend/Pdf/Element/Numeric.php';

    28 

    29 

    30 /** Zend_Pdf_Resource */

    31 require_once 'Zend/Pdf/Resource.php';

    32 

    33 

    34 /**

    35  * Graphics State.

    36  *

    37  * While some parameters in the graphics state can be set with individual operators,

    38  * as shown in Table 4.7, others cannot. The latter can only be set with the generic

    39  * graphics state operator gs (PDF 1.2).

    40  *

    41  * @package    Zend_Pdf

    42  * @copyright  Copyright (c) 2005-2010 Zend Technologies USA Inc. (http://www.zend.com)

    43  * @license    http://framework.zend.com/license/new-bsd     New BSD License

    44  */

    45 class Zend_Pdf_Resource_GraphicsState extends Zend_Pdf_Resource

    46 {

    47     /**

    48      * Object constructor.

    49      *

    50      * @param Zend_Pdf_Element_Object $extGStateObject

    51      * @throws Zend_Pdf_Exception

    52      */

    53     public function __construct(Zend_Pdf_Element_Object $extGStateObject = null)

    54     {

    55         if ($extGStateObject == null) {

    56             // Create new Graphics State object

    57             require_once 'Zend/Pdf/ElementFactory.php';

    58             $factory = Zend_Pdf_ElementFactory::createFactory(1);

    59 

    60             $gsDictionary = new Zend_Pdf_Element_Dictionary();

    61             $gsDictionary->Type = new Zend_Pdf_Element_Name('ExtGState');

    62 

    63             $extGStateObject = $factory->newObject($gsDictionary);

    64         }

    65 

    66         if ($extGStateObject->getType() != Zend_Pdf_Element::TYPE_DICTIONARY) {

    67             require_once 'Zend/Pdf/Exception.php';

    68             throw new Zend_Pdf_Exception('Graphics state PDF object must be a dictionary');

    69         }

    70 

    71         parent::__construct($gsDictionary);

    72     }

    73 

    74     /**

    75      * Set the transparancy

    76      *

    77      * $alpha == 0  - transparent

    78      * $alpha == 1  - opaque

    79      *

    80      * Transparency modes, supported by PDF:

    81      * Normal (default), Multiply, Screen, Overlay, Darken, Lighten, ColorDodge, ColorBurn, HardLight,

    82      * SoftLight, Difference, Exclusion

    83      *

    84      * @param float $alpha

    85      * @param string $mode

    86      * @throws Zend_Pdf_Exception

    87      * @return Zend_Pdf_Canvas_Interface

    88      */

    89     public function setAlpha($alpha, $mode = 'Normal')

    90     {

    91         if (!in_array($mode, array('Normal', 'Multiply', 'Screen', 'Overlay', 'Darken', 'Lighten', 'ColorDodge',

    92                                    'ColorBurn', 'HardLight', 'SoftLight', 'Difference', 'Exclusion'))) {

    93             require_once 'Zend/Pdf/Exception.php';

    94             throw new Zend_Pdf_Exception('Unsupported transparency mode.');

    95         }

    96         if (!is_numeric($alpha)  ||  $alpha < 0  ||  $alpha > 1) {

    97             require_once 'Zend/Pdf/Exception.php';

    98             throw new Zend_Pdf_Exception('Alpha value must be numeric between 0 (transparent) and 1 (opaque).');

    99         }

   100 

   101         $this->_resource->BM   = new Zend_Pdf_Element_Name($mode);

   102         $this->_resource->CA   = new Zend_Pdf_Element_Numeric($alpha);

   103         $this->_resource->ca   = new Zend_Pdf_Element_Numeric($alpha);

   104     }

   105 

   106 

   107     /** @todo add other Graphics State features support */

   108 }

   109