Stochastic Histogram

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

namespace cAlgo.Indicators
{
    [Levels(0.0)]
    [Indicator(IsOverlay = false, AccessRights = AccessRights.None)]
    public class StochasticHistogram : Indicator
    {
        [Parameter("%K Periods", DefaultValue = 14)]
        public int kPeriods { get; set; }

        [Parameter("%K Slowing", DefaultValue = 3)]
        public int kSlowing { get; set; }

        [Parameter("%D Periods", DefaultValue = 3)]
        public int dPeriods { get; set; }

        [Parameter("MA Type")]
        public MovingAverageType maType { get; set; }

        [Output("Histogram > 0", PlotType = PlotType.Histogram, Color = Colors.Green, Thickness = 1)]
        public IndicatorDataSeries HistogramPositive { get; set; }

        [Output("Histogram < 0", PlotType = PlotType.Histogram, Color = Colors.Green, Thickness = 1)]
        public IndicatorDataSeries HistogramNegative { get; set; }

        [Output("%K", PlotType = PlotType.Line, Color = Colors.Green, Thickness = 1)]
        public IndicatorDataSeries K { get; set; }

        [Output("%D", PlotType = PlotType.Line, LineStyle = LineStyle.Lines, Color = Colors.Red, Thickness = 1)]
        public IndicatorDataSeries D { get; set; }

        StochasticOscillator stochastic;

        protected override void Initialize()
        {
            stochastic = Indicators.StochasticOscillator(kPeriods, kSlowing, dPeriods, maType);
        }

        public override void Calculate(int index)
        {
            if (stochastic.PercentK[index] - 50 > 0)
                HistogramPositive[index] = stochastic.PercentK[index] - 50;
            if (stochastic.PercentK[index] - 50 < 0)
                HistogramNegative[index] = stochastic.PercentK[index] - 50;
            K[index] = stochastic.PercentK[index] - 50;
            D[index] = stochastic.PercentD[index] - 50;
        }
    }
}