Price Difference 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 mPDI : Indicator
    {
        [Parameter("Difference (100)", DefaultValue = 100)]
        public int inpDifference { get; set; }
        [Parameter("Data Source", DefaultValue = "Close")]
        public DataSeries inpDataSource { get; set; }

        [Output("PDI Up", LineColor = "Red", PlotType = PlotType.Points, Thickness = 5)]
        public IndicatorDataSeries outUp { get; set; }
        [Output("PDI Down", LineColor = "Green", PlotType = PlotType.Points, Thickness = 5)]
        public IndicatorDataSeries outDn { get; set; }
        
        private MovingAverage _ma;
        private double diff;
        
        
        protected override void Initialize()
        {
            _ma = Indicators.MovingAverage(inpDataSource, 1, MovingAverageType.Simple);
            diff = inpDifference * Symbol.PipSize;
        }

        public override void Calculate(int i)
        {
            outUp[i] = i>1 && _ma.Result[i]-_ma.Result[i-1] > diff ? Bars.LowPrices[i] : double.NaN;
            outDn[i] = i>1 && _ma.Result[i]-_ma.Result[i-1] < -diff ? Bars.HighPrices[i] : double.NaN;
        }
    }
}