---
id: "E:cAlgo.API.ChartArea.SizeChanged"
kind: "event"
type: "T:cAlgo.API.ChartArea"
url: "https://help.ctrader.com/ctrader-algo/references/Chart/ChartArea/SizeChanged/"
---

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

# ChartArea.SizeChanged

Member of [ChartArea](https://help.ctrader.com/ctrader-algo/references/Chart/ChartArea/index.md).

## SizeChanged

Occurs when the chart area size has changed.

Environments: Desktop supported · CLI supported · Cloud supported.

C#:

```csharp
event Action<ChartSizeEventArgs> SizeChanged;
```

Python:

```python
chartArea.SizeChanged += handler  # handler(obj: ChartSizeEventArgs)
```

### Returns

`Action<ChartSizeEventArgs>` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    Chart.SizeChanged += OnChartSizeChanged;
}

private void OnChartSizeChanged(ChartSizeEventArgs args)
{
    Print("Chart area resized to {0}x{1}", args.Area.Width, args.Area.Height);
}
```

Python:

```python
def on_start(self):
    api.Chart.SizeChanged += self.on_chart_size_changed

def on_chart_size_changed(self, args):
    api.Print(f"Chart area resized to {args.Area.Width}x{args.Area.Height}")
```