--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/Zend/Pdf/Resource/GraphicsState.php	Mon Dec 13 18:29:26 2010 +0100
@@ -0,0 +1,109 @@
+<?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 */
+}
+