92 lines
3.1 KiB
C#
92 lines
3.1 KiB
C#
using OxyPlot.Series;
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using OxyPlot;
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using System.Collections.Concurrent;
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using Prism.Mvvm;
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using NCalc;
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namespace MonitorModule.ViewModels
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{
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/// <summary>
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/// 监测通道：一个设备方法对应一个通道。
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/// 数据记录（DataPoints）与图表显示（Series）完全分离：
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/// - IsMonitored=true 时始终记录 DataPoints
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/// - IsDisplayed=true 时才创建 LineSeries 并绘制
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/// </summary>
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public class MonitorChannel : BindableBase
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{
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// ===== 标识 =====
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public string DeviceName { get; init; } = string.Empty;
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public string MethodName { get; init; } = string.Empty;
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public string DisplayName { get; init; } = string.Empty;
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// ===== 状态 =====
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private bool _isMonitored = true;
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/// <summary>是否在记录数据点（添加后始终为 true）</summary>
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public bool IsMonitored
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{
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get => _isMonitored;
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set => SetProperty(ref _isMonitored, value);
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}
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private bool _isDisplayed = true;
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/// <summary>是否在 OxyPlot 上显示</summary>
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public bool IsDisplayed
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{
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get => _isDisplayed;
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set => SetProperty(ref _isDisplayed, value);
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}
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// ===== 数学变换 =====
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private string? _mathExpression;
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/// <summary>可选数学变换表达式，如 "x*0.001"。为空则 DisplayValue=RawValue</summary>
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public string? MathExpression
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{
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get => _mathExpression;
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set => SetProperty(ref _mathExpression, value);
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}
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// ===== 颜色 =====
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public OxyColor Color { get; set; } = OxyColors.SteelBlue;
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// ===== 数据存储 =====
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/// <summary>所有采样数据点（线程安全），与 OxyPlot 无关</summary>
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public ConcurrentQueue<(double Time, double RawValue, double DisplayValue)> DataPoints { get; } = new();
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/// <summary>最大缓冲数据点数，超出则丢弃最旧的</summary>
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public int MaxBuffer { get; set; } = 5000;
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// ===== OxyPlot Series（仅 IsDisplayed=true 时存在）=====
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private LineSeries? _series;
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public LineSeries? Series
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{
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get => _series;
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set => SetProperty(ref _series, value);
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}
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// ===== 辅助方法 =====
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/// <summary>记录一个数据点：RawValue 经数学变换后得到 DisplayValue，一并入队</summary>
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public void Record(double time, double rawValue)
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{
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double displayValue = rawValue;
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DataPoints.Enqueue((time, rawValue, displayValue));
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// 超出缓冲上限时批量丢弃旧数据
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while (DataPoints.Count > MaxBuffer)
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{
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DataPoints.TryDequeue(out _);
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}
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// 如果正在显示，同步到 Series
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if (_series != null)
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{
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_series.Points.Add(new DataPoint(time, displayValue));
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while (_series.Points.Count > 200)
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{
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_series.Points.RemoveAt(0);
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}
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}
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}
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}
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}
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