Canvas.php

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<?php
#require_once 'Zend/Pdf/Canvas/Abstract.php';

class Zend_Pdf_Canvas extends Zend_Pdf_Canvas_Abstract
{
    protected $_procSet = array();

    protected $_width;

    protected $_height;

    protected $_resources = array('Font'      => array(),
                                  'XObject'   => array(),
                                  'ExtGState' => array());

    public function __construct($width, $height)
    {
        $this->_width  = $width;
        $this->_height = $height;
    }

    protected function _addProcSet($procSetName)
    {
        $this->_procset[$procSetName] = 1;
    }

    protected function _attachResource($type, Zend_Pdf_Resource $resource)
    {
        // Check, that resource is already attached to resource set.
        $resObject = $resource->getResource();
        foreach ($this->_resources[$type] as $resName => $collectedResObject) {
            if ($collectedResObject === $resObject) {
                return $resName;
            }
        }

        $idCounter = 1;
        do {
            $newResName = $type[0] . $idCounter++;
        } while (isset($this->_resources[$type][$newResName]));

        $this->_resources[$type][$newResName] = $resObject;

        return $newResName;
    }

    public function getResources()
    {
        $this->_resources['ProcSet'] = array_keys($this->_procSet);
        return $this->_resources;
    }

    public function getContents()
    {
    }

    public function getHeight()
    {
        return $this->_height;
    }

    public function getWidth()
    {
        return $this->_width;
    }
}