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Exp Hull Trend Strategy

Overview

Exp Hull Trend Strategy is based on the Hull Moving Average (HMA) indicator. The algorithm compares an intermediate Hull calculation with a smoothed Hull moving average. When the faster Hull line crosses above the slower smoothed line, the strategy opens a long position. When the fast line crosses below the smoothed line, the strategy opens a short position.

Strategy Logic

  1. Calculate a weighted moving average (WMA) of the closing price with period Length / 2.
  2. Calculate another WMA of the closing price with period Length.
  3. Build the intermediate Hull value: fast = 2 * WMA(Length/2) - WMA(Length).
  4. Smooth the intermediate value with a WMA of period sqrt(Length) to get the final Hull value slow.
  5. Generate signals:
    • Long Entry – when fast crosses above slow.
    • Short Entry – when fast crosses below slow.
  6. Positions are reversed on opposite signals. Protective orders are handled through StartProtection.

Parameters

Name Description
Hull Length Base period for Hull calculation. Determines sensitivity of both WMAs.
Candle Type Time frame of candles used for indicator calculations.

Notes

  • The strategy works on completed candles only.
  • Indicator values are bound via the high-level API to avoid manual data collections.
  • Volume is taken from the strategy settings; when the signal direction changes, the position is reversed.
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;

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Exp Hull Trend strategy based on Hull moving average cross.
/// Opens long when fast hull crosses above smoothed hull and short on opposite.
/// </summary>
public class ExpHullTrendStrategy : Strategy
{
	private readonly StrategyParam<int> _length;
	private readonly StrategyParam<decimal> _minSpreadPercent;
	private readonly StrategyParam<int> _cooldownBars;
	private readonly StrategyParam<DataType> _candleType;

	private decimal _prevFast;
	private decimal _prevSlow;
	private bool _initialized;
	private int _cooldownRemaining;

	// Manual WMA for final smoothing
	private readonly List<decimal> _finalBuffer = new();
	private int _finalLength;

	/// <summary>
	/// Base period for Hull moving average.
	/// </summary>
	public int Length
	{
		get => _length.Value;
		set => _length.Value = value;
	}

	/// <summary>
	/// Minimum normalized spread between the fast and slow lines required for a valid signal.
	/// </summary>
	public decimal MinSpreadPercent
	{
		get => _minSpreadPercent.Value;
		set => _minSpreadPercent.Value = value;
	}

	/// <summary>
	/// Number of completed candles to wait after a position change.
	/// </summary>
	public int CooldownBars
	{
		get => _cooldownBars.Value;
		set => _cooldownBars.Value = value;
	}

	/// <summary>
	/// Type of candles for indicator calculations.
	/// </summary>
	public DataType CandleType
	{
		get => _candleType.Value;
		set => _candleType.Value = value;
	}

	/// <summary>
	/// Initializes a new instance of the <see cref="ExpHullTrendStrategy"/>.
	/// </summary>
	public ExpHullTrendStrategy()
	{
		_length = Param(nameof(Length), 20)
			.SetDisplay("Hull Length", "Base period for Hull calculation", "Indicator");

		_minSpreadPercent = Param(nameof(MinSpreadPercent), 0.0015m)
			.SetDisplay("Min Spread %", "Minimum normalized spread between Hull lines", "Signal");

		_cooldownBars = Param(nameof(CooldownBars), 12)
			.SetDisplay("Cooldown Bars", "Completed candles to wait after a position change", "Signal");

		_candleType = Param(nameof(CandleType), TimeSpan.FromHours(4).TimeFrame())
			.SetDisplay("Candle Type", "Time frame for processing", "General");
	}

	/// <inheritdoc />
	public override IEnumerable<(Security, DataType)> GetWorkingSecurities()
	{
		return [(Security, CandleType)];
	}

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

		_finalLength = Math.Max(1, (int)Math.Sqrt(Length));

		var wmaHalf = new WeightedMovingAverage { Length = Math.Max(1, Length / 2) };
		var wmaFull = new WeightedMovingAverage { Length = Length };

		var subscription = SubscribeCandles(CandleType);
		subscription.Bind(wmaHalf, wmaFull, ProcessCandle).Start();

		var area = CreateChartArea();
		if (area != null)
		{
			DrawCandles(area, subscription);
			DrawOwnTrades(area);
		}
	}

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

		_prevFast = 0m;
		_prevSlow = 0m;
		_initialized = false;
		_cooldownRemaining = 0;
		_finalBuffer.Clear();
		_finalLength = 0;
	}

	private decimal CalcWma(decimal newVal)
	{
		_finalBuffer.Add(newVal);
		if (_finalBuffer.Count > _finalLength)
			_finalBuffer.RemoveAt(0);

		if (_finalBuffer.Count < _finalLength)
			return newVal;

		decimal sumWeight = 0;
		decimal sumVal = 0;
		for (int i = 0; i < _finalBuffer.Count; i++)
		{
			var w = i + 1;
			sumVal += _finalBuffer[i] * w;
			sumWeight += w;
		}
		return sumVal / sumWeight;
	}

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

		var fast = 2m * halfValue - fullValue; // intermediate Hull value
		var slow = CalcWma(fast); // smoothed Hull

		if (!_initialized)
		{
			_prevFast = fast;
			_prevSlow = slow;
			_initialized = true;
			return;
		}

		var crossUp = _prevFast <= _prevSlow && fast > slow;
		var crossDown = _prevFast >= _prevSlow && fast < slow;
		var spread = Math.Abs(fast - slow) / Math.Max(Math.Abs(slow), 1m);

		if (_cooldownRemaining > 0)
			_cooldownRemaining--;

		if (crossUp && spread >= MinSpreadPercent && _cooldownRemaining == 0 && Position <= 0)
		{
			if (Position < 0)
				BuyMarket();
			BuyMarket();
			_cooldownRemaining = CooldownBars;
		}
		else if (crossDown && spread >= MinSpreadPercent && _cooldownRemaining == 0 && Position >= 0)
		{
			if (Position > 0)
				SellMarket();
			SellMarket();
			_cooldownRemaining = CooldownBars;
		}

		_prevFast = fast;
		_prevSlow = slow;
	}
}