Line-visualizing-a-trade-on-the-chart

Here you go. Paste the DrawTradeLines routine to your Strategy code or a compiled DLL (which targets .NET Core) and call from BacktestComplete(). Team will discuss if this feature is worth including in our open source WealthLab.Community library.

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

namespace WealthScript4 
{
    public class MyStrategy : UserStrategyBase
    {
        //create indicators and other objects here, this is executed prior to the main trading loop
        public override void Initialize(BarHistory bars)
        {
         hh = new Highest(bars.High, 33);
         ll = new Lowest(bars.Low, 33);
         PlotIndicator(hh, Color.Green);
         PlotIndicator(ll, Color.Red);
        }

        //a basic stop and reverse system
        public override void Execute(BarHistory bars, int idx)
        {
         PlaceTrade(bars, TransactionType.Cover, OrderType.Stop, hh[idx]);
           PlaceTrade(bars, TransactionType.Sell, OrderType.Stop, ll[idx]);
           if (!HasOpenPosition(bars, PositionType.Long))
            PlaceTrade(bars, TransactionType.Buy, OrderType.Stop, hh[idx]);
           if (!HasOpenPosition(bars, PositionType.Short))
            PlaceTrade(bars, TransactionType.Short, OrderType.Stop, ll[idx]);
        }

      //run after Execute has finished
      public override void BacktestComplete()
      {
         DrawTradeLines(GetPositions(), false);
      }
      
      public void DrawTradeLines(List<Position> lst, bool showSignal = false)
      {
         for (int iPos = 0; iPos < lst.Count; iPos++)
         {
            Position position = lst[iPos];
            int positionExitBar;
            double positionExitPrice;

            if (position.IsOpen)
            {
               positionExitBar = position.Bars.Count - 1;
               positionExitPrice = position.Bars.Close[positionExitBar];
            }
            else
            {
               positionExitBar = position.ExitBar;
               positionExitPrice = position.ExitPrice;
            }

            Color col;
            if (position.PositionType == PositionType.Long)
               col = (positionExitPrice - position.EntryPrice) > 0 ? Color.Green : Color.Red;
            else
               col = (positionExitPrice - position.EntryPrice) > 0 ? Color.Red : Color.Green;

            DrawLine(position.EntryBar, position.EntryPrice, positionExitBar, positionExitPrice, col);

            if (showSignal)
            {
               DrawBarAnnotation(position.EntrySignalName, position.EntryBar, position.PositionType == PositionType.Long, Color.Black, 12);
               DrawBarAnnotation(position.ExitSignalName, position.ExitBar, position.PositionType == PositionType.Short, Color.Black, 12);
            }
         }
      }
      
      //declare private variables below
      IndicatorBase hh;
      IndicatorBase ll;
    }
}