wehub-resource-sync
132 lines
5.3 KiB
C#
132 lines
5.3 KiB
C#
/*
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* QUANTCONNECT.COM - Democratizing Finance, Empowering Individuals.
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* Lean Algorithmic Trading Engine v2.0. Copyright 2014 QuantConnect Corporation.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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using System;
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using QuantConnect.Data.Market;
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namespace QuantConnect.Indicators.CandlestickPatterns
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{
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/// <summary>
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/// Belt-hold candlestick pattern indicator
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/// </summary>
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/// <remarks>
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/// Must have:
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/// - long white(black) real body
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/// - no or very short lower(upper) shadow
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/// The meaning of "long" and "very short" is specified with SetCandleSettings
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/// The returned value is positive(+1) when white(bullish), negative(-1) when black(bearish)
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/// </remarks>
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public class BeltHold : CandlestickPattern
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{
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private readonly int _bodyLongAveragePeriod;
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private readonly int _shadowVeryShortAveragePeriod;
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private decimal _bodyLongPeriodTotal;
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private decimal _shadowVeryShortPeriodTotal;
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/// <summary>
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/// Initializes a new instance of the <see cref="BeltHold"/> class using the specified name.
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/// </summary>
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/// <param name="name">The name of this indicator</param>
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public BeltHold(string name)
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: base(name, Math.Max(CandleSettings.Get(CandleSettingType.BodyLong).AveragePeriod, CandleSettings.Get(CandleSettingType.ShadowVeryShort).AveragePeriod) + 1)
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{
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_bodyLongAveragePeriod = CandleSettings.Get(CandleSettingType.BodyLong).AveragePeriod;
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_shadowVeryShortAveragePeriod = CandleSettings.Get(CandleSettingType.ShadowVeryShort).AveragePeriod;
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}
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/// <summary>
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/// Initializes a new instance of the <see cref="BeltHold"/> class.
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/// </summary>
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public BeltHold()
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: this("BELTHOLD")
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{
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}
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/// <summary>
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/// Gets a flag indicating when this indicator is ready and fully initialized
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/// </summary>
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public override bool IsReady
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{
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get { return Samples >= Period; }
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}
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/// <summary>
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/// Computes the next value of this indicator from the given state
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/// </summary>
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/// <param name="window">The window of data held in this indicator</param>
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/// <param name="input">The input given to the indicator</param>
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/// <returns>A new value for this indicator</returns>
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protected override decimal ComputeNextValue(IReadOnlyWindow<IBaseDataBar> window, IBaseDataBar input)
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{
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if (!IsReady)
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{
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if (Samples >= Period - _bodyLongAveragePeriod)
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{
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_bodyLongPeriodTotal += GetCandleRange(CandleSettingType.BodyLong, input);
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}
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if (Samples >= Period - _shadowVeryShortAveragePeriod)
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{
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_shadowVeryShortPeriodTotal += GetCandleRange(CandleSettingType.ShadowVeryShort, input);
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}
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return 0m;
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}
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decimal value;
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if (
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// long body
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GetRealBody(input) > GetCandleAverage(CandleSettingType.BodyLong, _bodyLongPeriodTotal, input) &&
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(
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(
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// white body and very short lower shadow
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GetCandleColor(input) == CandleColor.White &&
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GetLowerShadow(input) < GetCandleAverage(CandleSettingType.ShadowVeryShort, _shadowVeryShortPeriodTotal, input)
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) ||
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(
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// black body and very short upper shadow
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GetCandleColor(input) == CandleColor.Black &&
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GetUpperShadow(input) < GetCandleAverage(CandleSettingType.ShadowVeryShort, _shadowVeryShortPeriodTotal, input)
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)
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))
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value = (int)GetCandleColor(input);
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else
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value = 0m;
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// add the current range and subtract the first range: this is done after the pattern recognition
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// when avgPeriod is not 0, that means "compare with the previous candles" (it excludes the current candle)
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_bodyLongPeriodTotal += GetCandleRange(CandleSettingType.BodyLong, input) -
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GetCandleRange(CandleSettingType.BodyLong, window[_bodyLongAveragePeriod]);
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_shadowVeryShortPeriodTotal += GetCandleRange(CandleSettingType.ShadowVeryShort, input) -
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GetCandleRange(CandleSettingType.ShadowVeryShort, window[_shadowVeryShortAveragePeriod]);
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return value;
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}
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/// <summary>
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/// Resets this indicator to its initial state
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/// </summary>
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public override void Reset()
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{
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_bodyLongPeriodTotal = 0m;
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_shadowVeryShortPeriodTotal = 0m;
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base.Reset();
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}
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}
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}
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