TrendSignal indicator

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

namespace cAlgo
{
    [Indicator(IsOverlay = true, AccessRights = AccessRights.None)]
    public class mTrendSignal : Indicator
    {
        [Parameter("Period (9)", DefaultValue = 9)]
        public int inpPeriod { get; set; }
        [Parameter("Risk (30)", DefaultValue = 30)]
        public double inpRisk { get; set; }

        [Output("TrendSignal OpenLong trigger", LineColor = "Green", PlotType = PlotType.Points, Thickness = 5)]
        public IndicatorDataSeries outLongOpen { get; set; }
        [Output("TrendSignal OpenShort trigger", LineColor = "Red", PlotType = PlotType.Points, Thickness = 5)]
        public IndicatorDataSeries outShortOpen { get; set; }
        
        private IndicatorDataSeries _hh, _ll, _min, _max, _trend, _up, _down;
                

        protected override void Initialize()
        {
            _hh = CreateDataSeries();
            _ll = CreateDataSeries();
            _min = CreateDataSeries();
            _max = CreateDataSeries();
            _trend = CreateDataSeries();
            _up = CreateDataSeries();
            _down = CreateDataSeries();
        }

        public override void Calculate(int i)
        {
            _hh[i] = Bars.HighPrices.Maximum(inpPeriod);
            _ll[i] = Bars.LowPrices.Minimum(inpPeriod);
            _max[i] = _hh[i] - (_hh[i] - _ll[i]) * inpRisk / 100.0;
            _min[i] = _ll[i] + (_hh[i] - _ll[i]) * inpRisk / 100.0;
            _up[i] = _down[i] = double.NaN;
            
            if(i>1 && Bars.ClosePrices[i-1] < _max[i-1] && Bars.ClosePrices[i] > _max[i-1] && _trend[i-1] != +1)
            {
                _trend[i] = +1;
                _up[i] = Bars.OpenPrices[i];
            }
            else
            {
                if(i>1 && Bars.ClosePrices[i-1] > _min[i-1] && Bars.ClosePrices[i] < _min[i-1] && _trend[i-1] != -1)
                {
                    _trend[i] = -1;
                    _down[i] = Bars.OpenPrices[i];
                }
                else
                    _trend[i] = (!double.IsNaN(_trend[i-1]) ? _trend[i-1] : 1);
            }
            
            outLongOpen[i] = !double.IsNaN(_up[i]) ? Bars.HighPrices[i] : _up[i];
            outShortOpen[i] = !double.IsNaN(_down[i]) ? Bars.LowPrices[i] : _down[i];
        }
    }
}