Awesome Oscillator in NinjaTrader — NinjaScript (C#) Source

The Awesome Oscillator in NinjaScript reuses the built-in SMA on the median price, plus per-bar PlotBrushes colouring. See the explainer for the concept.

What you’ll need

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

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 AlgoGenAO : Indicator
    {
        private Series<double> median;

        protected override void OnStateChange()
        {
            if (State == State.SetDefaults)
            {
                Name        = "AlgoGen Awesome Oscillator";
                Description = "Awesome Oscillator (5/34 median price)";
                Fast = 5; Slow = 34;
                IsOverlay   = false;

                AddPlot(new Stroke(Brushes.MediumSeaGreen, 2), PlotStyle.Bar, "AO");
            }
            else if (State == State.DataLoaded)
            {
                median = new Series<double>(this);
            }
        }

        protected override void OnBarUpdate()
        {
            median[0] = (High[0] + Low[0]) / 2.0;
            if (CurrentBar < Slow - 1)
                return;

            Value[0] = SMA(median, Fast)[0] - SMA(median, Slow)[0];

            // Green if AO rose vs the prior bar, red if it fell.
            if (CurrentBar > 0)
                PlotBrushes[0][0] = Value[0] >= Value[1]
                    ? Brushes.MediumSeaGreen : Brushes.IndianRed;
        }

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

        [NinjaScriptProperty][System.ComponentModel.DataAnnotations.Range(1, int.MaxValue)]
        [System.ComponentModel.Display(Name = "Slow", GroupName = "Parameters", Order = 1)]
        public int Slow { get; set; }
        #endregion
    }
}

Compile & apply

1. Press F5 to compile.
2. Add AlgoGen AO to a chart; the green/red histogram draws in its own panel, matching the output chart.

Gotchas

• SMA(median, ...). We run the built-in SMA over a Series<double> of the median price (H+L)/2, not over close.
• PlotBrushes[0][0] colours the current bar of plot 0 — compare Value[0] to Value[1] (momentum), not to zero.
• median as a Series. Storing it as a Series<double> lets SMA look back over it and survives reloads.
• Bonus — the Accelerator Oscillator. Store the AO in its own Series<double> and subtract a 5-SMA of it to get Williams’ AC:

// ao is a Series<double> holding Value[0] each bar:
ao[0] = SMA(median, Fast)[0] - SMA(median, Slow)[0];
double ac = ao[0] - SMA(ao, 5)[0];   // Accelerator Oscillator

• Colour by momentum. For both AO and AC, compare the current value to the previous bar’s (not to zero) when choosing green vs red.

That’s the five-language set: Python, MQL5, Pine Script, EasyLanguage, and this one. Now test an AO 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.