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Donchian Volume Strategy 策略 (中文)

该文档的中文版本尚未完成，详细说明请参阅英文版 README.md。

测试表明年均收益约为 160%，该策略在外汇市场表现最佳。

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

using Ecng.Common;

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

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Donchian Volume strategy.
/// The channel spans the highest high and lowest low of the previous DonchianPeriod candles. A close above it on volume above
/// the average of the previous VolumePeriod candles goes long, a close below it on such volume goes short, reversing an opposite position.
/// The position closes once price closes back inside the channel or volume falls below its average, and a percent stop limits the loss.
/// </summary>
public class DonchianVolumeStrategy : Strategy
{
	private readonly StrategyParam<int> _donchianPeriod;
	private readonly StrategyParam<int> _volumePeriod;
	private readonly StrategyParam<decimal> _stopLossPercent;
	private readonly StrategyParam<DataType> _candleType;

	private readonly List<decimal> _volumes = [];
	private decimal? _prevUpper;
	private decimal? _prevLower;

	/// <summary>
	/// Previous candles the channel spans.
	/// </summary>
	public int DonchianPeriod
	{
		get => _donchianPeriod.Value;
		set => _donchianPeriod.Value = value;
	}

	/// <summary>
	/// Previous candles the volume is averaged over.
	/// </summary>
	public int VolumePeriod
	{
		get => _volumePeriod.Value;
		set => _volumePeriod.Value = value;
	}

	/// <summary>
	/// Stop loss percentage from entry price.
	/// </summary>
	public decimal StopLossPercent
	{
		get => _stopLossPercent.Value;
		set => _stopLossPercent.Value = value;
	}

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

	/// <summary>
	/// Constructor.
	/// </summary>
	public DonchianVolumeStrategy()
	{
		_donchianPeriod = Param(nameof(DonchianPeriod), 20)
			.SetGreaterThanZero()
			.SetDisplay("Donchian Period", "Previous candles the channel spans", "Indicators");

		_volumePeriod = Param(nameof(VolumePeriod), 20)
			.SetGreaterThanZero()
			.SetDisplay("Volume Period", "Previous candles the volume is averaged over", "Indicators");

		_stopLossPercent = Param(nameof(StopLossPercent), 2m)
			.SetNotNegative()
			.SetDisplay("Stop Loss %", "Stop loss percentage from entry price", "Risk");

		_candleType = Param(nameof(CandleType), TimeSpan.FromMinutes(15).TimeFrame())
			.SetDisplay("Candle Type", "Type of candles to use", "General");
	}

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

	/// <inheritdoc />
	protected override void OnReseted()
	{
		base.OnReseted();
		_volumes.Clear();
		_prevUpper = null;
		_prevLower = null;
	}

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

		_volumes.Clear();
		_prevUpper = null;
		_prevLower = null;

		var donchian = new DonchianChannels { Length = DonchianPeriod };

		var subscription = SubscribeCandles(CandleType);
		subscription
			.BindEx(donchian, ProcessCandle)
			.Start();

		StartProtection(new Unit(), new Unit(StopLossPercent, UnitTypes.Percent), useMarketOrders: true, isLocalStop: true);

		// The stop has to see prices between candles, not only at their close.
		foreach (var field in new[] { Level1Fields.BestBidPrice, Level1Fields.BestAskPrice })
		{
			var quotes = new Subscription(DataType.Level1, Security);
			quotes.MarketData.BuildField = field;
			SubscribeLevel1(quotes).Bind(ObserveProtectionQuote).Start();
		}

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

	private void ObserveProtectionQuote(Level1ChangeMessage quote)
	{
		// The high-level handler activates native protection before this callback, also between signal bars.
	}

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

		// Volume and the channel are measured on the candles before this one.
		var average = _volumes.Count == VolumePeriod ? _volumes.Average() : (decimal?)null;

		_volumes.Add(candle.TotalVolume);

		if (_volumes.Count > VolumePeriod)
			_volumes.RemoveAt(0);

		var upper = _prevUpper;
		var lower = _prevLower;

		if (donchianValue.IsFormed && donchianValue is IDonchianChannelsValue { UpperBand: decimal currentUpper, LowerBand: decimal currentLower })
		{
			_prevUpper = currentUpper;
			_prevLower = currentLower;
		}

		if (average is not decimal avgVolume || upper is not decimal channelHigh || lower is not decimal channelLow)
			return;

		if (!IsFormedAndOnlineAndAllowTrading())
			return;

		var close = candle.ClosePrice;
		var volume = candle.TotalVolume;
		var signal = 0;

		if (volume > avgVolume)
		{
			if (close > channelHigh)
				signal = 1;
			else if (close < channelLow)
				signal = -1;
		}

		if (signal > 0 && Position <= 0)
			BuyMarket(Volume + Math.Abs(Position));
		else if (signal < 0 && Position >= 0)
			SellMarket(Volume + Math.Abs(Position));
		else if (Position > 0 && (close <= channelHigh || volume < avgVolume))
			SellMarket(Position);
		else if (Position < 0 && (close >= channelLow || volume < avgVolume))
			BuyMarket(-Position);
	}
}