GraphicsState.php

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<?php
#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';


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


class Zend_Pdf_Resource_GraphicsState extends Zend_Pdf_Resource
{
    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);
    }

    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);
    }


}