---
id: "T:cAlgo.API.ChartZoomEventArgs"
kind: "class"
namespace: "cAlgo.API"
url: "https://help.ctrader.com/ctrader-algo/references/EventArgs/ChartZoomEventArgs/"
---

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

# ChartZoomEventArgs (class)

Provides data for the chart type change event.

Environments: Desktop supported · CLI supported · Cloud not supported.

- Cloud: Never raised in the cloud: the events that pass it never fire there (Chart.ZoomChanged).

## Definition

```csharp
public class ChartZoomEventArgs
```

## Examples

C#:

```csharp
using cAlgo.API;

namespace cAlgo
{
    // This example shows how to use the Chart ChartZoomEventArgs
    public partial class ChartZoomEventArgsSample : Indicator
    {
        protected override void Initialize()
        {
            Chart.ZoomChanged += Chart_ZoomChanged;
        }

        private void Chart_ZoomChanged(ChartZoomEventArgs obj)
        {
            var text = string.Format("Chart Zoom Level Changed To: {0}", obj.Chart.ZoomLevel);

            Chart.DrawStaticText("zoom", text, VerticalAlignment.Top, HorizontalAlignment.Right, Color.Red);
        }

        public override void Calculate(int index)
        {
        }
    }
}
```

Python:

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

from cAlgo.API import *

class Test():
    def initialize(self):
        api.Chart.ZoomChanged += self.on_zoom_changed

    def on_zoom_changed(self, args):
        api.Chart.DrawStaticText("zoom", f"Chart Zoom Level Changed To: {args.Chart.ZoomLevel}", VerticalAlignment.Top, HorizontalAlignment.Right, Color.Red)
```

config.json:

```json
{
  "AccessRights": "None",
  "TimeZone": "UTC",
  "IsOverlay": true
}
```

## Properties

- `public Chart Chart {get;}` — Gets the chart. [details](https://help.ctrader.com/ctrader-algo/references/EventArgs/ChartZoomEventArgs/Chart/index.md)