SuperMap.WindowsPhone.Mapping.Map.GetNextScale C# (CSharp) Method

        public double GetNextScale(bool plus)
        {
            if (this.Dpi != 0.0)
            {
                double newRes = this.GetNextResolution(plus);
                return ScaleHelper.ScaleConversion(newRes, this.Dpi, this.CRS);
            }
            else
            {
                return double.NaN;
            }
        }