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Center of Gravity OSMA Strategy

This strategy uses the Center of Gravity OSMA oscillator to detect potential trend reversals. The oscillator multiplies simple and weighted moving averages, smooths the result twice and tracks changes in direction. When the indicator forms a local minimum and turns upward, the strategy closes short positions and may open a new long position. When a local maximum turns downward, long positions are closed and optional shorts are opened.

How It Works

  1. Close price is used as input for the custom indicator.
  2. The indicator calculates:
    • Simple moving average (SMA) with length Period.
    • Weighted moving average (WMA) with the same length.
    • Product of these two averages.
    • Two additional smoothing steps with lengths SmoothPeriod1 and SmoothPeriod2.
  3. Trading rules:
    • If previous value was lower than the value before it and the current value is higher than the previous one, the oscillator turned up. Any short position is closed and a long may be opened.
    • If previous value was higher than the value before it and the current value is lower than the previous one, the oscillator turned down. Any long position is closed and a short may be opened.
    • Optional stop loss and take profit values in price units protect open positions.

Parameters

  • Period – base period for SMA and WMA.
  • SmoothPeriod1 – length of the first smoothing stage.
  • SmoothPeriod2 – length of the second smoothing stage.
  • StopLoss – stop loss distance in price units (0 to disable).
  • TakeProfit – take profit distance in price units (0 to disable).
  • BuyPosOpen – allow opening long positions.
  • SellPosOpen – allow opening short positions.
  • BuyPosClose – allow closing long positions on a sell signal.
  • SellPosClose – allow closing short positions on a buy signal.
  • CandleType – candle type (timeframe) for calculations.

Notes

  • Implementations are available in both C# and Python.
  • Use tabs for indentation when modifying the code.
using System;
using System.Collections.Generic;
using System.Linq;

using Ecng.Common;

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

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Center-of-Gravity OSMA: product of a simple and weighted mean,
/// followed by two smoothing stages. Trades on local extrema of the oscillator.
/// </summary>
public class CenterOfGravityOsmaStrategy : Strategy
{
	private readonly StrategyParam<int> _period;
	private readonly StrategyParam<int> _smoothPeriod1;
	private readonly StrategyParam<int> _smoothPeriod2;
	private readonly StrategyParam<decimal> _stopLoss;
	private readonly StrategyParam<decimal> _takeProfit;
	private readonly StrategyParam<bool> _buyPosOpen;
	private readonly StrategyParam<bool> _sellPosOpen;
	private readonly StrategyParam<bool> _buyPosClose;
	private readonly StrategyParam<bool> _sellPosClose;
	private readonly StrategyParam<DataType> _candleType;

	private readonly Queue<decimal> _closes = new();
	private readonly Queue<decimal> _products = new();
	private readonly Queue<decimal> _stage1 = new();
	private decimal? _prior;
	private decimal? _priorPrior;
	private Order _pendingOrder;

	public int Period { get => _period.Value; set => _period.Value = value; }
	public int SmoothPeriod1 { get => _smoothPeriod1.Value; set => _smoothPeriod1.Value = value; }
	public int SmoothPeriod2 { get => _smoothPeriod2.Value; set => _smoothPeriod2.Value = value; }
	public decimal StopLoss { get => _stopLoss.Value; set => _stopLoss.Value = value; }
	public decimal TakeProfit { get => _takeProfit.Value; set => _takeProfit.Value = value; }
	public bool BuyPosOpen { get => _buyPosOpen.Value; set => _buyPosOpen.Value = value; }
	public bool SellPosOpen { get => _sellPosOpen.Value; set => _sellPosOpen.Value = value; }
	public bool BuyPosClose { get => _buyPosClose.Value; set => _buyPosClose.Value = value; }
	public bool SellPosClose { get => _sellPosClose.Value; set => _sellPosClose.Value = value; }
	public DataType CandleType { get => _candleType.Value; set => _candleType.Value = value; }

	public CenterOfGravityOsmaStrategy()
	{
		_period = Param(nameof(Period), 10).SetGreaterThanZero()
			.SetDisplay("Period", "Base SMA and WMA period", "Indicator");
		_smoothPeriod1 = Param(nameof(SmoothPeriod1), 3).SetGreaterThanZero()
			.SetDisplay("Smooth Period 1", "First smoothing length", "Indicator");
		_smoothPeriod2 = Param(nameof(SmoothPeriod2), 3).SetGreaterThanZero()
			.SetDisplay("Smooth Period 2", "Second smoothing length", "Indicator");
		_stopLoss = Param(nameof(StopLoss), 0m).SetNotNegative()
			.SetDisplay("Stop Loss", "Optional price-unit loss limit", "Risk");
		_takeProfit = Param(nameof(TakeProfit), 0m).SetNotNegative()
			.SetDisplay("Take Profit", "Optional price-unit profit target", "Risk");
		_buyPosOpen = Param(nameof(BuyPosOpen), true).SetDisplay("Buy Pos Open", "Allow long entry", "Trading");
		_sellPosOpen = Param(nameof(SellPosOpen), true).SetDisplay("Sell Pos Open", "Allow short entry", "Trading");
		_buyPosClose = Param(nameof(BuyPosClose), true).SetDisplay("Buy Pos Close", "Allow long exit", "Trading");
		_sellPosClose = Param(nameof(SellPosClose), true).SetDisplay("Sell Pos Close", "Allow short exit", "Trading");
		_candleType = Param(nameof(CandleType), TimeSpan.FromHours(4).TimeFrame())
			.SetDisplay("Candle Type", "Candle timeframe", "General");
	}

	public override IEnumerable<(Security sec, DataType dt)> GetWorkingSecurities() => [(Security, CandleType)];

	protected override void OnReseted()
	{
		base.OnReseted();
		ResetHistory();
	}

	private void ResetHistory()
	{
		_closes.Clear();
		_products.Clear();
		_stage1.Clear();
		_prior = _priorPrior = null;
		_pendingOrder = null;
	}

	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);
		ResetHistory();
		StartProtection(
			takeProfit: new Unit(TakeProfit, UnitTypes.Absolute),
			stopLoss: new Unit(StopLoss, UnitTypes.Absolute));
		SubscribeCandles(CandleType).Bind(ProcessCandle).Start();
	}

	private static void Append(Queue<decimal> history, decimal price, int period)
	{
		history.Enqueue(price);
		if (history.Count > period)
			history.Dequeue();
	}

	private void ProcessCandle(ICandleMessage candle)
	{
		if (candle.State != CandleStates.Finished)
			return;
		Append(_closes, candle.ClosePrice, Period);
		if (_closes.Count < Period)
			return;

		var weighted = 0m;
		var weight = 0;
		foreach (var price in _closes)
		{
			weight++;
			weighted += weight * price;
		}

		var sma = _closes.Average();
		var wma = weighted / (Period * (Period + 1m) / 2m);
		Append(_products, sma * wma, SmoothPeriod1);
		if (_products.Count < SmoothPeriod1)
			return;

		Append(_stage1, _products.Average(), SmoothPeriod2);
		if (_stage1.Count < SmoothPeriod2)
			return;

		var value = _stage1.Average();
		var turnUp = _priorPrior is decimal older && _prior is decimal previous
			&& previous < older && value > previous;
		var turnDown = _priorPrior is decimal olderDown && _prior is decimal previousDown
			&& previousDown > olderDown && value < previousDown;
		_priorPrior = _prior;
		_prior = value;
		if (!IsFormedAndOnlineAndAllowTrading() ||
			(_pendingOrder is not null && _pendingOrder.State is not (OrderStates.Done or OrderStates.Failed)))
			return;

		if (turnUp)
		{
			if (Position < 0m && SellPosClose)
				_pendingOrder = BuyMarket(-Position + (BuyPosOpen ? Volume : 0m));
			else if (Position == 0m && BuyPosOpen)
				_pendingOrder = BuyMarket(Volume);
		}
		else if (turnDown)
		{
			if (Position > 0m && BuyPosClose)
				_pendingOrder = SellMarket(Position + (SellPosOpen ? Volume : 0m));
			else if (Position == 0m && SellPosOpen)
				_pendingOrder = SellMarket(Volume);
		}
	}
}