BaseGraph::getDateGrouping

protected function getDateGrouping()
{
	$filter = $this->getFilterParameters();
	if(!isset($filter['TIME_PERIOD']))
	{
		return static::GROUP_DAY;
	}

	$periodDefinition = $filter['TIME_PERIOD']['datesel'];

	switch ($periodDefinition)
	{
		case DateType::YEAR:
		case DateType::QUARTER:
		case DateType::CURRENT_QUARTER:
			return static::GROUP_MONTH;
		case DateType::LAST_WEEK:
		case DateType::CURRENT_WEEK:
		case DateType::NEXT_WEEK:
			return static::GROUP_WEEK_DAY;
		default:
			return static::GROUP_DAY;
	}
}