feat: add DMH (Ehlers Directional Movement with Hann) indicator

lib/dynamics/dmh/Dmh.Quantower.cs

@@ -0,0 +1,50 @@
+using System.Drawing;
+using System.Runtime.CompilerServices;
+using TradingPlatform.BusinessLayer;
+
+namespace QuanTAlib;
+
+[SkipLocalsInit]
+public sealed class DmhIndicator : Indicator, IWatchlistIndicator
+{
+    [InputParameter("Period", sortIndex: 1, 1, 1000, 1, 0)]
+    public int Period { get; set; } = 14;
+
+    [InputParameter("Show cold values", sortIndex: 21)]
+    public bool ShowColdValues { get; set; } = true;
+
+    private Dmh _dmh = null!;
+    private readonly LineSeries _series;
+
+    public static int MinHistoryDepths => 0;
+    int IWatchlistIndicator.MinHistoryDepths => MinHistoryDepths;
+
+    public override string ShortName => $"DMH {Period}";
+    public override string SourceCodeLink => "https://github.com/mihakralj/QuanTAlib/blob/main/lib/dynamics/dmh/Dmh.Quantower.cs";
+
+    public DmhIndicator()
+    {
+        OnBackGround = true;
+        SeparateWindow = true;
+        Name = "DMH - Ehlers Directional Movement with Hann";
+        Description = "Ehlers' improved directional movement with Hann windowed FIR smoothing";
+        _series = new LineSeries(name: $"DMH {Period}", color: IndicatorExtensions.Momentum, width: 2, style: LineStyle.Solid);
+        AddLineSeries(_series);
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected override void OnInit()
+    {
+        _dmh = new Dmh(Period);
+        base.OnInit();
+    }
+
+    [MethodImpl(MethodImplOptions.AggressiveInlining)]
+    protected override void OnUpdate(UpdateArgs args)
+    {
+        TValue result = _dmh.Update(this.GetInputBar(args), args.IsNewBar());
+
+        _series.SetValue(result.Value);
+        _series.SetMarker(0, Color.Transparent);
+    }
+}