66 lines
1.6 KiB
C#
66 lines
1.6 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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namespace MECF.Framework.Common.SicMath
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{
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public class TimeDomainArithmeticMeanFilter : IFilter
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{
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#region Variables
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private readonly List<(DateTime time, double value)> _rawDataBuffer;
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#endregion
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#region Constructors
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public TimeDomainArithmeticMeanFilter(double durationSec)
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{
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FilterDurationInSec = durationSec;
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_rawDataBuffer = new List<(DateTime, double)>();
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}
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#endregion
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#region Properties
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/// <summary>
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/// 返回滤波时间。
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/// </summary>
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public double FilterDurationInSec { get; set; }
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#endregion
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#region Methods
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public void Feed(double value)
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{
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var now = DateTime.Now;
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_rawDataBuffer.Add((now, value));
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_rawDataBuffer.RemoveAll(x => x.time < now.AddSeconds(-FilterDurationInSec));
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}
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public double Filter()
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{
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// 如果采样时间设定值小于0,直接返回最后一个采样点数值。
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if (FilterDurationInSec <= 0)
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return _rawDataBuffer.Last().value;
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// 如果没有采样数据，返回double.NaN
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if (_rawDataBuffer.Count <= 0)
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return double.NaN;
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// 返回采样点的算术平均值。
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return _rawDataBuffer
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.Where(x=>double.IsNaN(x.value) == false)
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.Select(x => x.value)
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.Average();
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}
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#endregion
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}
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} |