code: @Override
  	protected void doTransform(ITransformable.Alpha transformable, float comp)
  	{
  		if (comp <= 0)
  			return;
  
  		float from = reversed ? toAlpha : fromAlpha;
  		float to = reversed ? fromAlpha : toAlpha;
  
  		transformable.setAlpha((int) (from + (to - from) * comp));
  	}
docs: Calculates the transformation.
  
  @param transformable the transformable
  @param comp the comp