---
id: "T:cAlgo.API.Indicators.Aroon"
kind: "interface"
namespace: "cAlgo.API.Indicators"
url: "https://help.ctrader.com/ctrader-algo/references/Indicators/Aroon/"
---

> Documentation index for agents: https://help.ctrader.com/ctrader-algo/llms.txt · machine index: https://help.ctrader.com/ctrader-algo/api.json

# Aroon (interface)

An indicator for identifying trends in a currency pair, as well as for gauging the probability of a trend reversal.

Environments: Desktop supported · CLI supported · Cloud supported.

## Definition

```csharp
public interface Aroon
```

## Remarks

The indicator fluctuates between 0 and 100, with values above 80 signalling an upward trend, and values below 20 signalling a downward trend.

## Examples

C#:

```csharp
using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo.Indicators
{
    public partial class AroonReferenceExample:Indicator
    {
        private Aroon _aroon;

        protected override void Initialize()
        {
            _aroon = Indicators.Aroon(Periods);
        }

        public override void Calculate(int index)
        {
            ResultAroonUp[index] = _aroon.Up[index];
            ResultAroonDown[index] = _aroon.Down[index];
        }
    }
}
```

Python:

```python
import clr
clr.AddReference("cAlgo.API")

from cAlgo.API import *

class Test():
    def initialize(self):
        self.aroon = api.Indicators.Aroon(api.Periods)

    def calculate(self, index):
        api.ResultAroonUp[index] = self.aroon.Up[index]
        api.ResultAroonDown[index] = self.aroon.Down[index]
```

config.json:

```json
{
  "Parameters": [
    {
      "Name": "Periods",
      "Type": "Integer",
      "DefaultValue": 25
    }
  ],
  "LineOutputs": [
    {
      "Name": "ResultAroonUp",
      "DisplayName": "Up"
    },
    {
      "Name": "ResultAroonDown",
      "DisplayName": "Down"
    }
  ]
}
```

C#:

```csharp
using cAlgo.API;
using cAlgo.API.Indicators;

namespace cAlgo.Robots
{
    // This sample cBot shows how to use an Aroon indicator
    public partial class AroonSample : Robot
    {
        private double _volumeInUnits;

        private Aroon _aroon;

        public Position[] BotPositions
        {
            get
            {
                return Positions.FindAll(Label);
            }
        }

        protected override void OnStart()
        {
            _volumeInUnits = Symbol.QuantityToVolumeInUnits(VolumeInLots);

            _aroon = Indicators.Aroon(25);
        }

        protected override void OnBar()
        {
            if (_aroon.Up.Last(1) > _aroon.Down.Last(1) && _aroon.Up.Last(2) < _aroon.Down.Last(2))
            {
                ClosePositions(TradeType.Sell);

                ExecuteMarketOrder(TradeType.Buy, SymbolName, _volumeInUnits, Label, StopLossInPips, TakeProfitInPips);
            }
            else if (_aroon.Up.Last(1) < _aroon.Down.Last(1) && _aroon.Up.Last(2) > _aroon.Down.Last(2))
            {
                ClosePositions(TradeType.Buy);

                ExecuteMarketOrder(TradeType.Sell, SymbolName, _volumeInUnits, Label, StopLossInPips, TakeProfitInPips);
            }
        }

        private void ClosePositions(TradeType tradeType)
        {
            foreach (var position in BotPositions)
            {
                if (position.TradeType != tradeType) continue;

                ClosePosition(position);
            }
        }
    }
}
```

Python:

```python
import clr

clr.AddReference("cAlgo.API")

# Import cAlgo API types
from cAlgo.API import *

# Import trading wrapper functions
from robot_wrapper import *

class AroonSample():
    def on_start(self):
        self.volumeInUnits = api.Symbol.QuantityToVolumeInUnits(api.VolumeInLots)
        self.aroon = api.Indicators.Aroon(api.Periods)

    def on_bar_closed(self):
        if self.aroon.Up.Last(0) > self.aroon.Down.Last(0) and self.aroon.Up.Last(1) < self.aroon.Down.Last(1):
            self.close_positions(TradeType.Sell)
            api.ExecuteMarketOrder(TradeType.Buy, api.SymbolName, self.volumeInUnits, api.Label, api.StopLossInPips, api.TakeProfitInPips)
        elif self.aroon.Up.Last(0) < self.aroon.Down.Last(0) and self.aroon.Up.Last(1) > self.aroon.Down.Last(1):
            self.close_positions(TradeType.Buy)
            api.ExecuteMarketOrder(TradeType.Sell, api.SymbolName, self.volumeInUnits, api.Label, api.StopLossInPips, api.TakeProfitInPips)

    def get_bot_positions(self):
        return api.Positions.FindAll(api.Label)

    def close_positions(self, tradeType):
        for position in self.get_bot_positions():
            if position.TradeType != tradeType:
                continue
            api.ClosePosition(position)
```

config.json:

```json
{
  "AccessRights": "None",
  "TimeZone": "UTC",
  "Parameters": [
    {
      "Name": "VolumeInLots",
      "DisplayName": "Volume (Lots)",
      "Type": "Double",
      "DefaultValue": 0.01
    },
    {
      "Name": "StopLossInPips",
      "DisplayName": "Stop Loss (Pips)",
      "Type": "Double",
      "DefaultValue": 10
    },
    {
      "Name": "TakeProfitInPips",
      "DisplayName": "Take Profit (Pips)",
      "Type": "Double",
      "DefaultValue": 10
    },
    {
      "Name": "Label",
      "Type": "String",
      "DefaultValue": "Sample"
    }
  ]
}
```

## Properties

- `IndicatorDataSeries Down {get;}` — Aroon Down [details](https://help.ctrader.com/ctrader-algo/references/Indicators/Aroon/Down/index.md)
- `IndicatorDataSeries Up {get;}` — Aroon Up [details](https://help.ctrader.com/ctrader-algo/references/Indicators/Aroon/Up/index.md)

## Inherited members

- `ChartIndicator AddToChart()` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/AddToChart/index.md)
- `Symbol Symbol {get;}` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/Symbol/index.md)
- `TimeFrame TimeFrame {get;}` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/TimeFrame/index.md)
- `Bars Bars {get;}` (from StandardIndicator) [details](https://help.ctrader.com/ctrader-algo/references/General/StandardIndicator/Bars/index.md)