QuanTAlib/lib/momentum/dmx/Dmx.Quantower.cs

using System.Drawing;
using TradingPlatform.BusinessLayer;

namespace QuanTAlib;

public class DmxIndicator : 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 Dmx? _dmx;
    protected LineSeries? Series;
    private int _warmupBarIndex = -1;

    public int MinHistoryDepths => Period;
    int IWatchlistIndicator.MinHistoryDepths => MinHistoryDepths;

    public override string ShortName => $"DMX {Period}";
    public override string SourceCodeLink => "https://github.com/mihakralj/QuanTAlib/blob/main/lib/momentum/dmx/Dmx.Quantower.cs";

    public DmxIndicator()
    {
        OnBackGround = true;
        SeparateWindow = true;
        Name = "DMX - Jurik Directional Movement Index";
        Description = "Jurik's smoother, lower-lag alternative to DMI/ADX";
        Series = new(name: $"DMX {Period}", color: IndicatorExtensions.Momentum, width: 2, style: LineStyle.Solid);
        AddLineSeries(Series);
    }

    protected override void OnInit()
    {
        _dmx = new Dmx(Period);
        _warmupBarIndex = -1;
        base.OnInit();
    }

    protected override void OnUpdate(UpdateArgs args)
    {
        bool isNew = args.Reason == UpdateReason.NewBar || args.Reason == UpdateReason.HistoricalBar;

        TBar bar = this.GetInputBar(args);

        TValue result = _dmx!.Update(bar, isNew);
        Series!.SetValue(result.Value);
        Series!.SetMarker(0, Color.Transparent);

        // DMX doesn't expose IsHot directly, but we can infer warmup
        if (_warmupBarIndex < 0 && Count > Period * 2) // Rough estimate for JMA warmup
            _warmupBarIndex = Count;
    }

    public override void OnPaintChart(PaintChartEventArgs args)
    {
        base.OnPaintChart(args);
        int warmupPeriod = _warmupBarIndex > 0 ? _warmupBarIndex : Count;
        this.PaintSmoothCurve(args, Series!, warmupPeriod, showColdValues: ShowColdValues, tension: 0.2);
    }
}