private int scaleFactor = 1;
public int ScaleFactor
        {
            get { return scaleFactor; }
            set
            {
                if (value == 0)
                {
                    scaleFactor = scaleFactor == 1 ? -1 : 1;
                }
                else
                    scaleFactor = value;
            }
        }

int i = --ScaleFactor;