public function __construct(PhpPresentation $pPhpPresentation = null)
{
// Assign PhpPresentation
$this->setPhpPresentation($pPhpPresentation);
// Set up disk caching location
$this->diskCachingDirectory = './';
// Set HashTable variables
$this->oDrawingHashTable = new HashTable();
$this->setZipAdapter(new ZipArchiveAdapter());
}