public function copyChart($src)
{
$chart = new Chart();
// new id
$chart->setId($this->getUnusedRandomId());
// but the rest remains the same
$chart->setUser($src->getUser());
$chart->setTitle($src->getTitle() . ' (' . __('Copy') . ')');
$chart->setMetadata(json_encode($src->getMetadata()));
$chart->setTheme($src->getTheme());
$chart->setLocale($src->getLocale());
$chart->setType($src->getType());
$chart->setCreatedAt(time());
$chart->setLastModifiedAt(time());
$chart->setLastEditStep(3);
// we need to copy the data, too
$chart->writeData($src->loadData());
$chart->save();
return $chart;
}