UI Tips & Tricks

<cat>UI.Intro</cat>
<title>UI Tips & Tricks</title>

There's 2 ways to make UI right now in S&box. 
You can either create Panels entirely through code, or you can use [Razor](ui-razor) to create panels with HTML and CSS that can also use C#.

It is recommended to use [Razor](ui-razor).

# Tips and Tricks

- You can set Panel classes - See [Panel.SetClass](https://sbox.game/dev/api/Sandbox.UI.Panel/SetClass), and [Panel.BindClass](https://sbox.game/dev/api/Sandbox.UI.Panel/BindClass)

- If a panel is not behaving as expected you can troubleshoot it using the 'UI Panels' inspector. If its not enabled, you can do so under View > UI Panels.
<upload src="2a1e9/8dd32660fc6ff2c.png" size="25281" name="image.png" />

## Drawing Polygons

Example:

```csharp
public class MyGui : Panel
{
	public override void DrawBackground( ref RenderState state )
	{
		// Obviously, don't declare this here every frame. But you get the idea.
		Span<Vertex> vertices = new Vertex[]
		{
			new Vertex( new Vector3( 100, 100 ), new Vector4( 0, 0, 0, 0 ), new Color32( 255, 0, 0 ) ),
			new Vertex( new Vector3( 300, 100 ), new Vector4( 0, 0, 0, 0 ), new Color32( 0, 255, 0 ) ),
			new Vertex( new Vector3( 300, 300 ), new Vector4( 0, 0, 0, 0 ), new Color32( 0, 0, 255 ) ),
		};

		var attribs = new RenderAttributes();
		attribs.Set( "Texture", Texture.White );

		Graphics.Draw( vertices, 3, Material.UI.Basic, attribs, Graphics.PrimitiveType.Triangles );
	}
}

// Wrapper component so you can use this in the scene system.
public class MyGuiComponent : PanelComponent
{
	protected override void OnEnabled()
	{
		var gui = new MyGui();
		gui.Parent = Panel;
	}
}
```

<upload src="b0cef/8dad4b74473f6ab.png" size="152528" name="image.png" />

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