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Exp Leading Strategy

This strategy implements a crossover system based on the custom Leading indicator described by John F. Ehlers in Cybernetics Analysis for Stock and Futures. The indicator calculates two lines:

  1. NetLead – smoothed leading filter controlled by the Alpha1 and Alpha2 coefficients.
  2. EMA – a simple exponential moving average with a constant factor of 0.5.

The strategy operates on finished candles from the selected timeframe. When the NetLead line crosses below the EMA line, an upward reversal is anticipated and a long position is opened. Conversely, when NetLead crosses above the EMA line, a short position is opened. The previous position, if any, is closed implicitly when an opposite order is sent.

Parameters

  • Alpha1 – coefficient for the intermediate leading calculation. Default: 0.25.
  • Alpha2 – smoothing factor applied to the leading result. Default: 0.33.
  • CandleType – candle data type used for calculations. Default: 4‑hour timeframe.
  • StopLoss – stop loss in absolute price units. Default: 1000.
  • TakeProfit – take profit in absolute price units. Default: 2000.

Trading Logic

  1. Each finished candle updates the NetLead and EMA values.
  2. If the previous bar showed NetLead above EMA and the latest bar shows NetLead below EMA, a buy market order is sent.
  3. If the previous bar showed NetLead below EMA and the latest bar shows NetLead above EMA, a sell market order is sent.
  4. StartProtection is used to automatically apply stop‑loss and take‑profit rules.

This example is intended for educational purposes to demonstrate how a MetaTrader strategy can be ported to the StockSharp high‑level API.

using System;
using System.Linq;
using System.Collections.Generic;

using Ecng.Common;
using Ecng.Collections;
using Ecng.Serialization;

using StockSharp.Algo.Indicators;
using StockSharp.Algo.Strategies;
using StockSharp.BusinessEntities;
using StockSharp.Messages;

using StockSharp.Algo;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Strategy based on crossover of custom Leading indicator and its EMA.
/// Opens long position when NetLead crosses below EMA and short when crosses above.
/// </summary>
public class ExpLeadingStrategy : Strategy
{
	private readonly StrategyParam<decimal> _alpha1;
	private readonly StrategyParam<decimal> _alpha2;
	private readonly StrategyParam<DataType> _candleType;
	private readonly StrategyParam<decimal> _stopLoss;
	private readonly StrategyParam<decimal> _takeProfit;
	private readonly StrategyParam<int> _cooldownBars;

	private bool _isInitialized;
	private bool _hasPrev2;
	private decimal _pricePrev;
	private decimal _leadPrev;
	private decimal _netLeadPrev;
	private decimal _emaPrev;
	private decimal _prevNetLead;
	private decimal _prevEma;
	private decimal _prev2NetLead;
	private decimal _prev2Ema;
	private int _barsSinceTrade;

	/// <summary>
	/// Alpha1 coefficient for Leading indicator.
	/// </summary>
	public decimal Alpha1 { get => _alpha1.Value; set => _alpha1.Value = value; }

	/// <summary>
	/// Alpha2 coefficient for Leading indicator.
	/// </summary>
	public decimal Alpha2 { get => _alpha2.Value; set => _alpha2.Value = value; }

	/// <summary>
	/// Candle type for calculations.
	/// </summary>
	public DataType CandleType { get => _candleType.Value; set => _candleType.Value = value; }

	/// <summary>
	/// Stop loss in price units.
	/// </summary>
	public decimal StopLoss { get => _stopLoss.Value; set => _stopLoss.Value = value; }

	/// <summary>
	/// Take profit in price units.
	/// </summary>
	public decimal TakeProfit { get => _takeProfit.Value; set => _takeProfit.Value = value; }

	/// <summary>
	/// Bars to wait after a completed trade.
	/// </summary>
	public int CooldownBars { get => _cooldownBars.Value; set => _cooldownBars.Value = value; }

	/// <summary>
	/// Initialize strategy parameters.
	/// </summary>
	public ExpLeadingStrategy()
	{
		_alpha1 = Param(nameof(Alpha1), 0.25m)
			.SetDisplay("Alpha1", "Alpha1 coefficient", "Indicator");

		_alpha2 = Param(nameof(Alpha2), 0.33m)
			.SetDisplay("Alpha2", "Alpha2 coefficient", "Indicator");

		_cooldownBars = Param(nameof(CooldownBars), 1)
			.SetDisplay("Cooldown Bars", "Bars to wait after a completed trade", "Protection");

		_candleType = Param(nameof(CandleType), TimeSpan.FromHours(4).TimeFrame())
			.SetDisplay("Candle Type", "Candle data type", "General");

		_stopLoss = Param(nameof(StopLoss), 1000m)
			.SetDisplay("Stop Loss", "Stop loss in price", "Protection");

		_takeProfit = Param(nameof(TakeProfit), 2000m)
			.SetDisplay("Take Profit", "Take profit in price", "Protection");
	}

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();

		_isInitialized = false;
		_hasPrev2 = false;
		_pricePrev = 0m;
		_leadPrev = 0m;
		_netLeadPrev = 0m;
		_emaPrev = 0m;
		_prevNetLead = 0m;
		_prevEma = 0m;
		_prev2NetLead = 0m;
		_prev2Ema = 0m;
		_barsSinceTrade = CooldownBars;
	}

	/// <inheritdoc />
	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		StartProtection(new Unit(TakeProfit, UnitTypes.Absolute), new Unit(StopLoss, UnitTypes.Absolute));

		var subscription = SubscribeCandles(CandleType);
		subscription
			.Bind(ProcessCandle)
			.Start();
	}

	private void ProcessCandle(ICandleMessage candle)
	{
		if (candle.State != CandleStates.Finished)
			return;

		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		if (_barsSinceTrade < CooldownBars)
			_barsSinceTrade++;

		var price = (candle.HighPrice + candle.LowPrice) / 2m;

		if (!_isInitialized)
		{
			_pricePrev = price;
			_leadPrev = price;
			_netLeadPrev = price;
			_emaPrev = price;
			_prevNetLead = price;
			_prevEma = price;
			_isInitialized = true;
			return;
		}

		var lead = 2m * price + (Alpha1 - 2m) * _pricePrev + (1m - Alpha1) * _leadPrev;
		var netLead = Alpha2 * lead + (1m - Alpha2) * _netLeadPrev;
		var ema = 0.5m * price + 0.5m * _emaPrev;

		if (_hasPrev2)
		{
			var buySignal = _prev2NetLead > _prev2Ema && _prevNetLead < _prevEma;
			var sellSignal = _prev2NetLead < _prev2Ema && _prevNetLead > _prevEma;

			if (_barsSinceTrade >= CooldownBars)
			{
				if (buySignal && Position <= 0)
				{
					BuyMarket(Volume + Math.Abs(Position));
					_barsSinceTrade = 0;
				}
				else if (sellSignal && Position >= 0)
				{
					SellMarket(Volume + Math.Abs(Position));
					_barsSinceTrade = 0;
				}
			}
		}
		else
		{
			_hasPrev2 = true;
		}

		_prev2NetLead = _prevNetLead;
		_prev2Ema = _prevEma;
		_prevNetLead = netLead;
		_prevEma = ema;
		_pricePrev = price;
		_leadPrev = lead;
		_netLeadPrev = netLead;
		_emaPrev = ema;
	}
}