---
id: "P:cAlgo.API.ControlBase.Opacity"
kind: "property"
type: "T:cAlgo.API.ControlBase"
url: "https://help.ctrader.com/ctrader-algo/references/Controls/ControlBase/Opacity/"
---

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

# ControlBase.Opacity

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

## Opacity

Gets or sets the level of opacity of the chart control instance. Can be set from 0 (transparent) to 1 (opaque). Values higher than 1 will be set to 1, values below 0 will be set to 0.

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

- CLI: Accepted without error but never displayed, so control events such as Click are never raised.
- Cloud: Accepted without error but never displayed, so control events such as Click are never raised.

C#:

```csharp
public double Opacity {get; set;}
```

Python:

```python
controlBase.Opacity: float
```

### Returns

`double` — 

### Examples

C#:

```csharp
var border = new Border { BackgroundColor = Color.Gold, Width = 150, Height = 60, Opacity = 0.5 };
Chart.AddControl(border);
Print("Opacity: {0}", border.Opacity);
```

Python:

```python
border = Border()
border.BackgroundColor = Color.Gold
border.Width = 150
border.Height = 60
border.Opacity = 0.5
api.Chart.AddControl(border)
api.Print(f"Opacity: {border.Opacity}")
```