IndicatorBars

public partial class HeikinAshiBars : Indicator
{
    public override void Calculate(int index)
    {
        var bar = Bars[index];
        var close = (bar.Open + bar.High + bar.Low + bar.Close) / 4;
        var open = index == 0 ? bar.Open : (Result.OpenPrices[index - 1] + Result.ClosePrices[index - 1]) / 2;
        var high = Math.Max(bar.High, Math.Max(open, close));
        var low = Math.Min(bar.Low, Math.Min(open, close));
        Result[index] = new OhlcvBar(open, high, low, close, bar.TickVolume);
    }
}

def calculate(self, index):
    bar = api.Bars[index]
    closePrice = (bar.Open + bar.High + bar.Low + bar.Close) / 4
    openPrice = bar.Open if index == 0 else (api.Result.OpenPrices[index - 1] + api.Result.ClosePrices[index - 1]) / 2
    highPrice = max(bar.High, openPrice, closePrice)
    lowPrice = min(bar.Low, openPrice, closePrice)
    api.Result[index] = OhlcvBar(openPrice, highPrice, lowPrice, closePrice, bar.TickVolume)

{
  "AccessRights": "None",
  "IsOverlay": false,
  "BarOutputs": [
    {
      "Name": "Result",
      "DisplayName": "Heikin Ashi"
    }
  ]
}