Double Ema Trend

using cAlgo.API;

namespace cAlgo
{
    [Indicator(IsOverlay = true, TimeZone = TimeZones.UTC, AutoRescale = false, AccessRights = AccessRights.None)]
    public class DoubleEMAtrend : Indicator
    {
        [Parameter("Source")]
        public DataSeries Source { get; set; }

        [Parameter("Periods", DefaultValue = 50)]
        public int PeriodsTrend { get; set; }

        [Parameter("Periods", DefaultValue = 100)]
        public int PeriodsBase { get; set; }

        [Output("trend", LineColor = "Turquoise", LineStyle = LineStyle.LinesDots,Thickness = 2)]
        public IndicatorDataSeries Result { get; set; }

        [Output("base",IsHistogram =false, LineColor = "Black", LineStyle = LineStyle.LinesDots ,Thickness = 2)]
        public IndicatorDataSeries ResultBase { get; set; }

        private double expTrend;
        private double expBase;
     
        protected override void Initialize()
        {
            expTrend = 2.0 / (PeriodsTrend + 1);
            expBase = 2.0 / (PeriodsBase + 1);
       
        }

        public override void Calculate(int index)
        {
       
            var previousValue = Result[index - 1];

            if (double.IsNaN(previousValue))
                Result[index] = Source[index];
            else
                Result[index] = Source[index] * expTrend + previousValue * (1 - expTrend);
                
                
            var previousValueBase = ResultBase[index - 1];
            
            if (double.IsNaN(previousValueBase))
                ResultBase[index] = Source[index];
            else
                ResultBase[index] = Source[index] * expBase + previousValueBase * (1 - expBase);
        }
    }
}