Slope Direction Line indicator

using System;
using cAlgo.API;
using cAlgo.API.Collections;
using cAlgo.API.Indicators;
using cAlgo.API.Internals;

namespace cAlgo
{
    [Indicator(IsOverlay = true, AccessRights = AccessRights.None)]
    public class mSlopeDirectionLine : Indicator
    {
        [Parameter("Period (55)", DefaultValue = 55)]
        public int inpPeriod { get; set; }
        [Parameter("Smooth Type (ema)", DefaultValue = MovingAverageType.Exponential)]
        public MovingAverageType inpSmoothType { get; set; }

        [Output("SlopeDirectionLine", LineColor = "Transparent", PlotType = PlotType.DiscontinuousLine, Thickness = 1)]
        public IndicatorDataSeries outSDL { get; set; }
        [Output("SlopeDirectionLine bullish", LineColor = "Green", PlotType = PlotType.DiscontinuousLine, Thickness = 2)]
        public IndicatorDataSeries outSDLp { get; set; }
        [Output("SlopeDirectionLine bearish", LineColor = "Red", PlotType = PlotType.DiscontinuousLine, Thickness = 2)]
        public IndicatorDataSeries outSDLn { get; set; }
        
        private MovingAverage _ma, _ma2, _sdl;
        private IndicatorDataSeries _raw, _trend;
        

        protected override void Initialize()
        {
            _ma = Indicators.MovingAverage(Bars.ClosePrices, inpPeriod, inpSmoothType);
            _ma2 = Indicators.MovingAverage(Bars.ClosePrices, (int)inpPeriod/2, inpSmoothType);
            _raw = CreateDataSeries();
            _trend = CreateDataSeries();
            _sdl = Indicators.MovingAverage(_raw, (int)Math.Sqrt(inpPeriod), inpSmoothType);
        }

        public override void Calculate(int i)
        {
            _raw[i] = 2.0 * _ma2.Result[i] - _ma.Result[i];
            _trend[i] = i>inpPeriod ? (_sdl.Result[i] > _sdl.Result[i-1] ? +1 : _sdl.Result[i] < _sdl.Result[i-1] ? -1 : _trend[i-1]) : +1;
     
            outSDL[i] = _sdl.Result[i];
            outSDLp[i] = _trend[i] == +1 ? _sdl.Result[i] : double.NaN;
            outSDLn[i] = _trend[i] == -1 ? _sdl.Result[i] : double.NaN;
        }
    }
}