Volume Price Momentum indicator

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

namespace cAlgo
{
    [Levels(0)]
    [Indicator(IsOverlay = false, AccessRights = AccessRights.None)]
    public class mVolumePriceMomentum : Indicator
    {
        [Parameter("Periods (2)", DefaultValue = 2)]
        public int inpPeriods { get; set; }
        [Parameter("BB Period (200)", DefaultValue = 200, Group = "Bands")]
        public int inpPeriodBB { get; set; }
        [Parameter("BB Deviation (0.618)", DefaultValue = 0.618, Group = "Bands")]
        public double inpStddevBB { get; set; }
        [Parameter("BB Smooth Type (sma)", DefaultValue = MovingAverageType.Simple, Group = "Bands")]
        public MovingAverageType inpSmoothTypeBB { get; set; }

        [Output("Volume Price Momentum Oscillator", IsHistogram = false, LineColor = "Black", LineStyle = LineStyle.Solid, PlotType = PlotType.Line, Thickness = 1)]
        public IndicatorDataSeries outVPMo { get; set; }
        [Output("Bands Up", LineColor = "LightBlue", PlotType = PlotType.Line, LineStyle = LineStyle.Solid, Thickness = 1)]
        public IndicatorDataSeries outBBup { get; set; }
        [Output("Bands Down", LineColor = "LightBlue", PlotType = PlotType.Line, LineStyle = LineStyle.Solid, Thickness = 1)]
        public IndicatorDataSeries outBBdn { get; set; }
        [Output("Bands Middle", LineColor = "LightBlue", PlotType = PlotType.Line, LineStyle = LineStyle.Solid, Thickness = 1)]
        public IndicatorDataSeries outBBmid { get; set; }
        
        private IndicatorDataSeries _vpm, _vpmo;
        private MovingAverage _vpmsmooth;
        private BollingerBands _bands;
        

        protected override void Initialize()
        {
            _vpmo = CreateDataSeries();
            _vpm = CreateDataSeries();
            _vpmsmooth = Indicators.MovingAverage(_vpm, inpPeriods, MovingAverageType.Exponential);
            _bands = Indicators.BollingerBands(_vpmsmooth.Result, inpPeriodBB, inpStddevBB, inpSmoothTypeBB);
        }

        public override void Calculate(int i)
        {
            _vpm[i] = Bars.TickVolumes[i] * (i>1 ? Bars.ClosePrices[i] - Bars.ClosePrices[i-1] : Bars.ClosePrices[i] - Bars.TypicalPrices[i]);
            _vpmo[i] = _vpmsmooth.Result[i];
            
            outVPMo[i] = _vpmo[i];
            outBBup[i] = _bands.Top[i];
            outBBdn[i] = _bands.Bottom[i];
            outBBmid[i] = _bands.Main[i];
        }
    }
}