volume indicators

lib/volume/va/Va.Quantower.cs

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+using System.Drawing;
+using System.Runtime.CompilerServices;
+using TradingPlatform.BusinessLayer;
+
+namespace QuanTAlib;
+
+[SkipLocalsInit]
+public sealed class VaIndicator : Indicator, IWatchlistIndicator
+{
+    [InputParameter("Show cold values", sortIndex: 21)]
+    public bool ShowColdValues { get; set; } = true;
+
+    private Va _va = null!;
+    private readonly LineSeries _series;
+
+#pragma warning disable S2325 // Instance property required by Quantower indicator interface
+    public int MinHistoryDepths => 1;
+#pragma warning restore S2325
+    int IWatchlistIndicator.MinHistoryDepths => 1;
+
+    public override string ShortName => "VA";
+    public override string SourceCodeLink => "https://github.com/mihakralj/QuanTAlib/blob/main/lib/volume/va/Va.Quantower.cs";
+
+    public VaIndicator()
+    {
+        OnBackGround = true;
+        SeparateWindow = true;
+        Name = "VA - Volume Accumulation";
+        Description = "Cumulative volume indicator that measures volume flow relative to the midpoint of each bar's range.";
+
+        _series = new LineSeries(name: "VA", color: Color.Cyan, width: 2, style: LineStyle.Solid);
+        AddLineSeries(_series);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected override void OnInit()
+    {
+        _va = new Va();
+        base.OnInit();
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected override void OnUpdate(UpdateArgs args)
+    {
+        TBar bar = this.GetInputBar(args);
+        TValue result = _va.Update(bar, args.IsNewBar());
+
+        _series.SetValue(result.Value, _va.IsHot, ShowColdValues);
+    }
+}