# GH_CanvasChannel enum

Namespace: [Grasshopper.GUI.Canvas](https://developer.rhino3d.com/api/gh1/namespace/grasshopper.gui.canvas.md) · Assembly: [Grasshopper](https://developer.rhino3d.com/api/gh1/assembly/grasshopper.md)

```cs
public enum GH_CanvasChannel
```

Enumerates all the drawing channels that are handled inside the Grasshopper canvas.

## Values

| Name | Value | Description |
| --- | --- | --- |
| First | 0 | First channel. At present, the first channel equals the Groups channel. |
| Groups | 0 | Channel for Group outlines and name tags. |
| Wires | 10 | Channel for connecting wires. |
| Objects | 20 | Channels for Document Objects (components, parameters, special objects) |
| Last | 30 | Last channel. At present, the last channel equals the Overlay channel. |
| Overlay | 30 | Channel for drawing overlay geometry. |