Ultimate Oscillator in NinjaTrader — NinjaScript (C#) Source

The Ultimate Oscillator in NinjaScript keeps buying pressure and true range in Series<double> and sums them over three windows. See the explainer.

What you’ll need

• NinjaTrader 8
• New → NinjaScript Editor → Indicators → New Indicator, name it AlgoGenUO

The source

#region Using declarations
using System;
using System.Windows.Media;
using NinjaTrader.NinjaScript;
using NinjaTrader.NinjaScript.Indicators;
#endregion

namespace NinjaTrader.NinjaScript.Indicators
{
    public class AlgoGenUO : Indicator
    {
        private Series<double> bp, tr;

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Name        = "AlgoGen Ultimate Oscillator";
                Description = "Ultimate Oscillator (7/14/28)";
                S1 = 7; S2 = 14; S3 = 28;
                IsOverlay   = false;

                AddPlot(new Stroke(Brushes.DodgerBlue, 2), PlotStyle.Line, "UO");
                AddLine(Brushes.Gray, 70, "Overbought");
                AddLine(Brushes.Gray, 30, "Oversold");
            }
            else if (State == State.DataLoaded)
            {
                bp = new Series<double>(this);
                tr = new Series<double>(this);
            }
        }

        private double Sum(Series<double> s, int period)
        {
            double sum = 0;
            for (int i = 0; i < period; i++) sum += s[i];
            return sum;
        }

        protected override void OnBarUpdate()
        {
            if (CurrentBar == 0) { bp[0] = 0; tr[0] = High[0] - Low[0]; return; }

            double trueLow = Math.Min(Low[0], Close[1]);
            bp[0] = Close[0] - trueLow;
            tr[0] = Math.Max(High[0], Close[1]) - trueLow;

            if (CurrentBar < S3) return;
            double a1 = Sum(bp, S1) / Sum(tr, S1);
            double a2 = Sum(bp, S2) / Sum(tr, S2);
            double a3 = Sum(bp, S3) / Sum(tr, S3);
            Value[0] = 100.0 * (4 * a1 + 2 * a2 + a3) / 7.0;
        }

        #region Properties
        [NinjaScriptProperty][System.ComponentModel.DataAnnotations.Range(1, int.MaxValue)]
        [System.ComponentModel.Display(Name = "S1", GroupName = "Parameters", Order = 0)]
        public int S1 { get; set; }
        [NinjaScriptProperty][System.ComponentModel.DataAnnotations.Range(1, int.MaxValue)]
        [System.ComponentModel.Display(Name = "S2", GroupName = "Parameters", Order = 1)]
        public int S2 { get; set; }
        [NinjaScriptProperty][System.ComponentModel.DataAnnotations.Range(1, int.MaxValue)]
        [System.ComponentModel.Display(Name = "S3", GroupName = "Parameters", Order = 2)]
        public int S3 { get; set; }
        #endregion
    }
}

Compile & apply

1. Press F5 to compile.
2. Add AlgoGen Ultimate Oscillator to a chart; it draws in its own panel between 0 and 100 with the 30/70 lines, matching the output chart.

Gotchas

• bp/tr as Series. Storing buying pressure and true range as Series<double> lets the window sums look back and survive reloads.
• True low/high from Close[1]. The prior close in the min/max gives the true range, matching ATR.
• Sum, then divide. Sum(bp)/Sum(tr) per window; the 4/2/1 weighting blends the three.

That’s the five-language set: Python, MQL5, Pine Script, EasyLanguage, and this one. Now test a UO rule in AlgoGen.

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This post is educational, not financial advice. Indicators describe the past; they don’t predict the future. Backtest anything before you risk real money on it.