Position-Size-Max-Percent-Risk

CODE:
using WealthLab.Backtest;
using System;
using WealthLab.Core;
using WealthLab.Indicators;
using System.Collections.Generic;

namespace WealthScript2 
{
    public class MaxRiskExample : UserStrategyBase
    {
      public MaxRiskExample()
      {
         AddParameter("Max Risk %", ParameterType.Double, 1.0, 0.5, 3, 0.5);
      }

        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         StartIndex = 50;
         _sma1 = SMA.Series(bars.Close, 10);
         _sma2 = SMA.Series(bars.Close, 50);     // we'll use this as the stop loss for a long trade
         PlotIndicator(_sma1, WLColor.Green);
         PlotIndicator(_sma2, WLColor.Red);
         
         _pctRisk = Parameters[0].AsDouble;
         PlotStopsAndLimits(3);
        }

        //execute the strategy rules here, this is executed once for each bar in the backtest history
        public override void Execute(BarHistory bars, int idx)
        {
         if (!HasOpenPosition(bars, PositionType.Long))
         {
            if (bars.Close.CrossesOver(_sma1, idx) && bars.Close[idx] > _sma2[idx])
            {
               Transaction t = PlaceTrade(bars, TransactionType.Buy, OrderType.Market);
               ApplyMaxRiskSizing(bars, t, bars.Close[idx], _sma2[idx], _pctRisk,  CurrentEquity);               
            }
            }
            else
            {
            Position p = LastPosition; 
            if (idx - p.EntryBar + 1 > 30)
               ClosePosition(p, OrderType.Market, 0, "Timeout");
            else
            {
               //stop loss will be the highest value of the slow MA since the entry bar
               double stopLoss = Highest.Value(idx, _sma2, idx - p.EntryBar + 1); 
               ClosePosition(p, OrderType.Stop, stopLoss, "SL");
               ClosePosition(p, OrderType.Limit, p.EntryPrice * 1.03, "PTgt");
            }
            }
        }

      //basisPrice should be the Close for a market order or the stop/limit trigger price for entry
      void ApplyMaxRiskSizing(BarHistory bars, Transaction t, double basisPrice, double initializeStopLoss, double pctRisk, double currentEquity, int roundLots = 1)
      {         
         double pointValue = bars.SymbolInfo?.PointValue != null ? bars.SymbolInfo.PointValue : 1;
         t.AutoStopLossPrice = initializeStopLoss; 
         int sign = t.TransactionType == TransactionType.Short  ? -1 : 1;
         double shareSize = (pctRisk / 100d * currentEquity) / (sign * pointValue * (basisPrice - t.AutoStopLossPrice));
         
         //Assign the quantity for the round lots specified (or not specified)
         t.Quantity = Math.Floor(shareSize / roundLots) * roundLots;          
      }

      //declare private variables below
      SMA _sma1;
      SMA _sma2;
      double _pctRisk;
    }
}