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TwoCrows.cs
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TwoCrows.cs
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/*
* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using QuantConnect.Data.Market;
namespace QuantConnect.Indicators.CandlestickPatterns
{
/// <summary>
/// Two Crows candlestick pattern indicator
/// </summary>
/// <remarks>
/// Must have:
/// - first candle: long white candle
/// - second candle: black real body
/// - gap between the first and the second candle's real bodies
/// - third candle: black candle that opens within the second real body and closes within the first real body
/// The meaning of "long" is specified with SetCandleSettings
/// The returned value is negative (-1): two crows is always bearish;
/// The user should consider that two crows is significant when it appears in an uptrend, while this function
/// does not consider the trend.
/// </remarks>
public class TwoCrows : CandlestickPattern
{
private readonly int _bodyLongAveragePeriod;
private decimal _bodyLongPeriodTotal;
/// <summary>
/// Initializes a new instance of the <see cref="TwoCrows"/> class using the specified name.
/// </summary>
/// <param name="name">The name of this indicator</param>
public TwoCrows(string name)
: base(name, CandleSettings.Get(CandleSettingType.BodyLong).AveragePeriod + 2 + 1)
{
_bodyLongAveragePeriod = CandleSettings.Get(CandleSettingType.BodyLong).AveragePeriod;
}
/// <summary>
/// Initializes a new instance of the <see cref="TwoCrows"/> class.
/// </summary>
public TwoCrows()
: this("TWOCROWS")
{
}
/// <summary>
/// Gets a flag indicating when this indicator is ready and fully initialized
/// </summary>
public override bool IsReady
{
get { return Samples >= Period; }
}
/// <summary>
/// Computes the next value of this indicator from the given state
/// </summary>
/// <param name="window">The window of data held in this indicator</param>
/// <param name="input">The input given to the indicator</param>
/// <returns>A new value for this indicator</returns>
protected override decimal ComputeNextValue(IReadOnlyWindow<IBaseDataBar> window, IBaseDataBar input)
{
if (!IsReady)
{
if (Samples >= Period - _bodyLongAveragePeriod - 2 && Samples < Period - 2)
{
_bodyLongPeriodTotal += GetCandleRange(CandleSettingType.BodyLong, input);
}
return 0m;
}
decimal value;
if (
// 1st: white
GetCandleColor(window[2]) == CandleColor.White &&
// long
GetRealBody(window[2]) > GetCandleAverage(CandleSettingType.BodyLong, _bodyLongPeriodTotal, window[2]) &&
// 2nd: black
GetCandleColor(window[1]) == CandleColor.Black &&
// gapping up
GetRealBodyGapUp(window[1], window[2]) &&
// 3rd: black
GetCandleColor(input) == CandleColor.Black &&
// opening within 2nd rb
input.Open < window[1].Open && input.Open > window[1].Close &&
// closing within 1st rb
input.Close > window[2].Open && input.Close < window[2].Close
)
value = -1m;
else
value = 0m;
// add the current range and subtract the first range: this is done after the pattern recognition
// when avgPeriod is not 0, that means "compare with the previous candles" (it excludes the current candle)
_bodyLongPeriodTotal += GetCandleRange(CandleSettingType.BodyLong, window[2]) -
GetCandleRange(CandleSettingType.BodyLong, window[2 + _bodyLongAveragePeriod]);
return value;
}
/// <summary>
/// Resets this indicator to its initial state
/// </summary>
public override void Reset()
{
_bodyLongPeriodTotal = 0m;
base.Reset();
}
}
}