T3 Velocity indicator

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

namespace cAlgo
{
    [Levels(0)]
    [Indicator(AccessRights = AccessRights.None)]
    public class mT3velocity : Indicator
    {
        [Parameter("Period (14)", DefaultValue = 14)]
        public int inpPeriod { get; set; }
        [Parameter("Factor (1.0)", DefaultValue = 1, Step = 0.01, MinValue = 0, MaxValue = 1.0)]
        public double inpFactor { get; set; }
        [Parameter("Original (false)", DefaultValue = false)]
        public bool inpOriginal { get; set; }
        [Parameter("Normalisation Period (20)", DefaultValue = 20)]
        public int inpPeriodNormalisation { get; set; }

        [Output("T3 Full", LineColor = "Black", LineStyle = LineStyle.Solid, Thickness = 1)]
        public IndicatorDataSeries outT3n { get; set; }
        
        private int _per, _per2;
        private double _f, _c1, _c2, _c3, _c4, _alphaa, _alphab;
        private IndicatorDataSeries _t30a, _t31a, _t32a, _t33a, _t34a, _t35a, _t3a, _t30b, _t31b, _t32b, _t33b, _t34b, _t35b, _t3b, _out, _smin, _smax, _sto;
        
        
        protected override void Initialize()
        {
            _f = inpFactor;
            _per = inpPeriod;
            _per2 = Convert.ToInt16(inpPeriod/2);
            _c1 = -_f * _f * _f;
            _c2 = 3 * _f * _f + 3 * _f * _f * _f;
            _c3 = -6 * _f * _f - 3 * _f - 3 * _f * _f * _f;
            _c4 = 1 + 3 * _f + _f * _f * _f + 3 * _f * _f;
            _alphaa = inpOriginal == true ? 2.0 / (1.0 + _per) : 2.0 / (2.0 + (_per - 1.0) / 2.0);
            _alphab = inpOriginal == true ? 2.0 / (1.0 + _per2) : 2.0 / (2.0 + (_per2 - 1.0) / 2.0);
            _t30a = CreateDataSeries();
            _t31a = CreateDataSeries();
            _t32a = CreateDataSeries();
            _t33a = CreateDataSeries();
            _t34a = CreateDataSeries();
            _t35a = CreateDataSeries();
            _t3a = CreateDataSeries();
            _t30b = CreateDataSeries();
            _t31b = CreateDataSeries();
            _t32b = CreateDataSeries();
            _t33b = CreateDataSeries();
            _t34b = CreateDataSeries();
            _t35b = CreateDataSeries();
            _t3b = CreateDataSeries();
            _out = CreateDataSeries();
            _smin = CreateDataSeries();
            _smax = CreateDataSeries();
            _sto = CreateDataSeries();
        }

        public override void Calculate(int i)
        {
            _t30a[i] = i>1 ? _t30a[i-1] + _alphaa * (Bars.TypicalPrices[i] - _t30a[i-1]) : Bars.TypicalPrices[i];
            _t31a[i] = i>1 ? _t31a[i-1] + _alphaa * _t30a[i] - _t31a[i-1] : _t30a[i];
            _t32a[i] = i>1 ? _t32a[i-1] + _alphaa * _t31a[i] - _t32a[i-1] : _t31a[i];
            _t33a[i] = i>1 ? _t33a[i-1] + _alphaa * _t32a[i] - _t33a[i-1] : _t32a[i];
            _t34a[i] = i>1 ? _t34a[i-1] + _alphaa * _t33a[i] - _t34a[i-1] : _t33a[i];
            _t35a[i] = i>1 ? _t35a[i-1] + _alphaa * _t34a[i] - _t35a[i-1] : _t34a[i];
            _t3a[i] = _c1 * _t35a[i] + _c2 * _t34a[i] +_c3 * _t33a[i] +  _c4 * _t32a[i];
            _t30b[i] = i>1 ? _t30b[i-1] + _alphab * (Bars.TypicalPrices[i] - _t30b[i-1]) : Bars.TypicalPrices[i];
            _t31b[i] = i>1 ? _t31b[i-1] + _alphab * _t30b[i] - _t31b[i-1] : _t30b[i];
            _t32b[i] = i>1 ? _t32b[i-1] + _alphab * _t31b[i] - _t32b[i-1] : _t31b[i];
            _t33b[i] = i>1 ? _t33b[i-1] + _alphab * _t32b[i] - _t33b[i-1] : _t32b[i];
            _t34b[i] = i>1 ? _t34b[i-1] + _alphab * _t33b[i] - _t34b[i-1] : _t33b[i];
            _t35b[i] = i>1 ? _t35b[i-1] + _alphab * _t34b[i] - _t35b[i-1] : _t34b[i];
            _t3b[i] = _c1 * _t35b[i] + _c2 * _t34b[i] +_c3 * _t33b[i] +  _c4 * _t32b[i];
            _out[i] = _t3b[i] - _t3a[i];
            _smin[i] = _out.Minimum(inpPeriodNormalisation);
            _smax[i] = _out.Maximum(inpPeriodNormalisation);
            _sto[i] = (200 * (_out[i] - _smin[i]) / (_smax[i] - _smin[i])) - 100;
            
            outT3n[i] = _sto[i];
        }
    }
}