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PSAR Trader Strategy

The PSAR Trader strategy acts on shifts in the Parabolic SAR indicator. When the SAR flips below price a long position is opened, and when the SAR flips above price a short position is opened. An optional "Close On Opposite" setting reverses the position when an opposite signal appears. Trading occurs only during the configured session hours. Stop loss and take profit are managed by the protection module.

Details

  • Entry Criteria: Price crossing the Parabolic SAR.
  • Long/Short: Both directions.
  • Exit Criteria: Opposite SAR crossing or position reversal.
  • Stops: Yes, fixed via parameters.
  • Default Values:
    • SarStep = 0.001m
    • SarMaxStep = 0.2m
    • StartHour = 0
    • EndHour = 23
    • CloseOnOpposite = true
    • TakeValue = 50 (absolute)
    • StopValue = 50 (absolute)
    • CandleType = TimeSpan.FromMinutes(5)
  • Filters:
    • Category: Trend
    • Direction: Both
    • Indicators: Parabolic SAR
    • Stops: Fixed
    • Complexity: Basic
    • Timeframe: Intraday (5m)
    • Seasonality: No
    • Neural Networks: No
    • Divergence: No
    • Risk Level: Medium
using System;
using System.Collections.Generic;

using Ecng.Common;

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

namespace StockSharp.Samples.Strategies;

/// <summary>
/// Parabolic SAR cross strategy.
/// Opens long when price moves above SAR and short when price moves below SAR.
/// </summary>
public class PsarTraderStrategy : Strategy
{
	private readonly StrategyParam<decimal> _sarStep;
	private readonly StrategyParam<decimal> _sarMaxStep;
	private readonly StrategyParam<DataType> _candleType;

	private bool _prevPriceAboveSar;
	private bool _hasPrev;

	public decimal SarStep { get => _sarStep.Value; set => _sarStep.Value = value; }
	public decimal SarMaxStep { get => _sarMaxStep.Value; set => _sarMaxStep.Value = value; }
	public DataType CandleType { get => _candleType.Value; set => _candleType.Value = value; }

	public PsarTraderStrategy()
	{
		_sarStep = Param(nameof(SarStep), 0.001m)
			.SetGreaterThanZero()
			.SetDisplay("SAR Step", "Acceleration factor for Parabolic SAR", "Parabolic SAR");

		_sarMaxStep = Param(nameof(SarMaxStep), 0.2m)
			.SetGreaterThanZero()
			.SetDisplay("SAR Max Step", "Maximum acceleration factor", "Parabolic SAR");

		_candleType = Param(nameof(CandleType), TimeSpan.FromHours(4).TimeFrame())
			.SetDisplay("Candle Type", "Type of candles to use", "General");
	}

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

	protected override void OnReseted()
	{
		base.OnReseted();
		_prevPriceAboveSar = false;
		_hasPrev = false;
	}

	protected override void OnStarted2(DateTime time)
	{
		base.OnStarted2(time);

		var parabolicSar = new ParabolicSar
		{
			AccelerationStep = SarStep,
			AccelerationMax = SarMaxStep
		};

		SubscribeCandles(CandleType).Bind(parabolicSar, ProcessCandle).Start();
	}

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

		var isPriceAboveSar = candle.ClosePrice > sarValue;

		if (!_hasPrev)
		{
			_prevPriceAboveSar = isPriceAboveSar;
			_hasPrev = true;
			return;
		}

		if (_prevPriceAboveSar != isPriceAboveSar)
		{
			if (isPriceAboveSar && Position <= 0)
			{
				if (Position < 0) BuyMarket();
				BuyMarket();
			}
			else if (!isPriceAboveSar && Position >= 0)
			{
				if (Position > 0) SellMarket();
				SellMarket();
			}
		}

		_prevPriceAboveSar = isPriceAboveSar;
	}
}