/**
* Invokes drawing procedure.
*
* Formats each of node, retreives drawing tasks and executes them.
*
* @param array $pages Array of pages to draw
*/
public function draw($pages)
{
if ($this->isProcessed()) {
throw new LogicException(sprintf('Pdf has alredy been drawed.'));
}
$this->processed = true;
if (is_array($pages)) {
$pageCollection = new PageCollection();
foreach ($pages as $page) {
if (!$page instanceof Page) {
throw new DrawingException(sprintf('Not all elements of passed array are PHPPdf\\Core\\Node\\Page type. One of them is "%s".', get_class($page)));
}
$pageCollection->add($page);
}
} elseif ($pages instanceof PageCollection) {
$pageCollection = $pages;
} else {
throw new InvalidArgumentException(sprintf('Argument of draw method must be an array of pages or PageCollection object, "%s" given.', get_class($pages)));
}
$pageCollection->format($this);
$tasks = $pageCollection->getAllDrawingTasks($this);
$this->invokeTasks($tasks);
}
