[HandlerName("Hull's MA")]
    [HandlerCategory("vvTSLtools")]
    public class HMA : BasePeriodIndicatorHandler, IDouble2DoubleHandler
    {
        // Hull Moving Average
        // HMA = WMA(2*WMA(PRICE, n/2) - WMA(PRICE, n), sqrt(n))

        public IList<double> Execute(IList<double> source)
        {
            int per = Period / 2;
            int per2 = Convert.ToInt32(Math.Sqrt(Period));
            WMA wma_ = new WMA();
            IList<double> hma = new double[source.Count];
            IList<double> hmabuff = new double[source.Count];
            var wma1 = wma_.GenWMA(source, Period / 2);
            var wma2 = wma_.GenWMA(source, Period);

            for (int i = 0; i < source.Count; i++ )
            {
                hmabuff[i] = (2 * wma1[i] - wma2[i]);
            }
            hma = wma_.GenWMA(hmabuff, per2);
            return hma;
        }
    }