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

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

# ChartArea.DragStart

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

## DragStart

Occurs when MouseDown event is happening on a chart area and a mouse is captured for dragging.

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

- CLI: Never raised: no chart is displayed, so there is nothing to interact with.
- Cloud: Never raised: no chart is displayed, so there is nothing to interact with.

C#:

```csharp
event Action<ChartDragEventArgs> DragStart;
```

Python:

```python
chartArea.DragStart += handler  # handler(obj: ChartDragEventArgs)
```

### Returns

`Action<ChartDragEventArgs>` — 

### Examples

C#:

```csharp
protected override void OnStart()
{
    Chart.DragStart += OnChartDragStart;
}

private void OnChartDragStart(ChartDragEventArgs args)
{
    Print("Drag started at {0}, {1}", args.TimeValue, args.YValue);
}
```

Python:

```python
def on_start(self):
    api.Chart.DragStart += self.on_chart_drag_start

def on_chart_drag_start(self, args):
    api.Print(f"Drag started at {args.TimeValue}, {args.YValue}")
```