ImageWatermark::getRatio

public function getRatio()
{
	if($this->ratio === null)
	{
		if($this->size == static::SIZE_BIG)
		{
			return 0.75;
		}
		if($this->size == static::SIZE_SMALL)
		{
			return 0.20;
		}
		if($this->size == static::SIZE_REAL)
		{
			return 1.00;
		}
		//static::SIZE_MEDIUM
		return 0.50;
	}
	return $this->ratio;
}