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TSI WPR Cross Strategy

This strategy trades based on the crossover of the True Strength Index (TSI) calculated from the Williams %R oscillator. When the TSI crosses above its smoothed signal line the strategy enters a long position. When the TSI crosses below the signal line it enters a short position.

Parameters

  • Candle Type: Timeframe of candles used for calculation.
  • Williams %R Period: Number of bars for the Williams %R indicator.
  • Short Length: Short EMA length used in the TSI calculation.
  • Long Length: Long EMA length used in the TSI calculation.
  • Signal Length: EMA length applied to TSI to form the signal line.

Trading Rules

  1. Calculate Williams %R value of each finished candle.
  2. Feed this value into the True Strength Index indicator.
  3. Smooth the TSI with an EMA to obtain the signal line.
  4. Buy when TSI crosses above the signal line.
  5. Sell when TSI crosses below the signal line.
  6. Existing positions in the opposite direction are closed on a new signal.

Notes

  • The strategy uses high-level API with automatic candle subscriptions.
  • StartProtection is launched at startup for basic risk management.
  • Chart areas are created to visualize TSI, its signal line and executed trades.
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>
/// Strategy based on True Strength Index crossover filtered by Williams %R.
/// Buys when TSI crosses above its signal line and WPR is in oversold,
/// sells when TSI crosses below its signal line and WPR is in overbought.
/// </summary>
public class TsiWprCrossStrategy : Strategy
{
	private readonly StrategyParam<int> _wprPeriod;
	private readonly StrategyParam<int> _cooldownBars;
	private readonly StrategyParam<DataType> _candleType;

	private decimal _prevTsi;
	private decimal _prevSignal;
	private bool _initialized;
	private int _cooldownRemaining;

	/// <summary>
	/// Williams %R period.
	/// </summary>
	public int WprPeriod
	{
		get => _wprPeriod.Value;
		set => _wprPeriod.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>
	/// Candles type to process.
	/// </summary>
	public DataType CandleType
	{
		get => _candleType.Value;
		set => _candleType.Value = value;
	}

	public TsiWprCrossStrategy()
	{
		_wprPeriod = Param(nameof(WprPeriod), 14)
			.SetGreaterThanZero()
			.SetDisplay("Williams %R Period", "Period for Williams %R", "Indicators");

		_cooldownBars = Param(nameof(CooldownBars), 4)
			.SetDisplay("Cooldown Bars", "Completed candles to wait after a signal", "Signal");

		_candleType = Param(nameof(CandleType), TimeSpan.FromMinutes(5).TimeFrame())
			.SetDisplay("Candle Type", "Candle type for strategy", "General");
	}

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

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

		_prevTsi = 0m;
		_prevSignal = 0m;
		_initialized = false;
		_cooldownRemaining = 0;
	}

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

		var tsi = new TrueStrengthIndex();
		var wpr = new WilliamsR { Length = WprPeriod };

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

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

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

		if (!tsiValue.IsFinal || !wprValue.IsFinal)
			return;

		var tv = (ITrueStrengthIndexValue)tsiValue;
		if (tv.Tsi is not decimal tsi || tv.Signal is not decimal signal)
			return;

		var wpr = wprValue.ToDecimal();

		if (!_initialized)
		{
			_prevTsi = tsi;
			_prevSignal = signal;
			_initialized = true;
			return;
		}

		var crossedUp = _prevTsi <= _prevSignal && tsi > signal;
		var crossedDown = _prevTsi >= _prevSignal && tsi < signal;

		if (_cooldownRemaining > 0)
			_cooldownRemaining--;

		// WPR range: -100 to 0. Oversold < -80, Overbought > -20
		if (crossedUp && wpr < -55 && _cooldownRemaining == 0 && Position <= 0)
		{
			if (Position < 0)
				BuyMarket();
			BuyMarket();
			_cooldownRemaining = CooldownBars;
		}
		else if (crossedDown && wpr > -45 && _cooldownRemaining == 0 && Position >= 0)
		{
			if (Position > 0)
				SellMarket();
			SellMarket();
			_cooldownRemaining = CooldownBars;
		}

		_prevTsi = tsi;
		_prevSignal = signal;
	}
}