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

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

# CenterOfGravity (interface)

The Center of Gravity (COG) indicator is a technical indicator developed by John Ehlers in 2002, used to identify potential turning points in the price as early as possible.

Environments: Desktop supported · CLI supported · Cloud supported.

## Definition

```csharp
public interface CenterOfGravity
```

## Examples

C#:

```csharp
var centerOfGravity = Indicators.CenterOfGravity(10);
Print("COG: {0}, Lag: {1}", centerOfGravity.Result.Last(1), centerOfGravity.Lag.Last(1));
```

Python:

```python
centerOfGravity = api.Indicators.CenterOfGravity(10)
api.Print(f"COG: {centerOfGravity.Result.Last(1)}, Lag: {centerOfGravity.Lag.Last(1)}")
```

C#:

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

namespace cAlgo.Robots
{
    // This sample cBot shows how to use the Center Of Gravity indicator
    public partial class CenterOfGravitySample : Robot
    {
        private double _volumeInUnits;

        private CenterOfGravity _centerOfGravity;

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

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

            _centerOfGravity = Indicators.CenterOfGravity(10);
        }

        protected override void OnBar()
        {
            if (_centerOfGravity.Result.Last(1) > _centerOfGravity.Lag.Last(1) && _centerOfGravity.Result.Last(2) <= _centerOfGravity.Lag.Last(2))
            {
                ClosePositions(TradeType.Sell);

                ExecuteMarketOrder(TradeType.Buy, SymbolName, _volumeInUnits, Label, StopLossInPips, TakeProfitInPips);
            }
            else if (_centerOfGravity.Result.Last(1) < _centerOfGravity.Lag.Last(1) && _centerOfGravity.Result.Last(2) >= _centerOfGravity.Lag.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 CenterOfGravitySample():
    def on_start(self):
        self.volumeInUnits = api.Symbol.QuantityToVolumeInUnits(api.VolumeInLots)
        self.centerOfGravity = api.Indicators.CenterOfGravity(10)

    def on_bar_closed(self):
        if self.centerOfGravity.Result.Last(0) > self.centerOfGravity.Lag.Last(0) and self.centerOfGravity.Result.Last(1) <= self.centerOfGravity.Lag.Last(1):
            self.close_positions(TradeType.Sell)
            api.ExecuteMarketOrder(TradeType.Buy, api.SymbolName, self.volumeInUnits, api.Label)
        elif self.centerOfGravity.Result.Last(0) < self.centerOfGravity.Lag.Last(0) and self.centerOfGravity.Result.Last(1) >= self.centerOfGravity.Lag.Last(1):
            self.close_positions(TradeType.Buy)
            api.ExecuteMarketOrder(TradeType.Sell, api.SymbolName, self.volumeInUnits, api.Label)

    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 Lag {get; set;}` — The lag/signal/trigger line of COG [details](https://help.ctrader.com/ctrader-algo/references/Indicators/CenterOfGravity/Lag/index.md)
- `IndicatorDataSeries Result {get; set;}` — The COG line, by using it you can identify the support and resistance levels and have a more or less clear idea when the price starts moving in a different direction. [details](https://help.ctrader.com/ctrader-algo/references/Indicators/CenterOfGravity/Result/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)