Rainbow gradient!

UICatalog/Scenarios/TextEffectsScenario.cs

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+using System;
+using System.Collections.Generic;
+using System.Text;
+using Terminal.Gui;
+using Terminal.Gui.TextEffects;
+using static UICatalog.Scenario;
+
+
+using Color = Terminal.Gui.TextEffects.Color;
+
+namespace UICatalog.Scenarios;
+
+
+
+[ScenarioMetadata ("Text Effects", "Text Effects.")]
+[ScenarioCategory ("Colors")]
+public class TextEffectsScenario : Scenario
+{
+    public override void Main ()
+    {
+        Application.Init ();
+        var top = Application.Top;
+
+        // Creates a window that occupies the entire terminal with a title.
+        var window = new Window ()
+        {
+            X = 0,
+            Y = 1, // Leaves one row for the toplevel menu
+
+            // By using Dim.Fill(), it will automatically resize without manual intervention
+            Width = Dim.Fill (),
+            Height = Dim.Fill (),
+            Title = "Text Effects Scenario"
+        };
+
+        // Create a large empty view.
+        var emptyView = new TextEffectsExampleView ()
+        {
+            X = 0,
+            Y = 0,
+            Width = Dim.Fill (),
+            Height = Dim.Fill () ,
+        };
+
+        window.Add (emptyView);
+
+        // Create a label in the center of the window.
+        var label = new Label ()
+        {
+            X = Pos.Center (),
+            Y = Pos.Center (),
+            Width = 10,
+            Height = 1,
+            Title = "Hello"            
+        };
+        window.Add (label);
+
+        Application.Run (window);
+        Application.Shutdown ();
+    }
+}
+
+internal class TextEffectsExampleView : View
+{
+    public override void OnDrawContent (Rectangle viewport)
+    {
+        base.OnDrawContent (viewport);
+
+        // Define the colors of the rainbow
+        var stops = new List<Color>
+        {
+            Color.FromRgb(255, 0, 0),     // Red
+            Color.FromRgb(255, 165, 0),   // Orange
+            Color.FromRgb(255, 255, 0),   // Yellow
+            Color.FromRgb(0, 128, 0),     // Green
+            Color.FromRgb(0, 0, 255),     // Blue
+            Color.FromRgb(75, 0, 130),    // Indigo
+            Color.FromRgb(238, 130, 238)  // Violet
+        };
+
+        // Define the number of steps between each color
+        var steps = new List<int>
+        {
+            20, // between Red and Orange
+            20, // between Orange and Yellow
+            20, // between Yellow and Green
+            20, // between Green and Blue
+            20, // between Blue and Indigo
+            20  // between Indigo and Violet
+        };
+
+        // Create the gradient
+        var rainbowGradient = new Gradient (stops, steps, loop: true);
+
+
+        for (int x = 0 ; x < viewport.Width; x++)
+        {
+            double fraction = (double)x / (viewport.Width - 1);
+            Color color = rainbowGradient.GetColorAtFraction (fraction);
+
+            // Assuming AddRune is a method you have for drawing at specific positions
+            Application.Driver.SetAttribute (
+                
+                new Attribute (
+                    new Terminal.Gui.Color(color.R, color.G, color.B),
+                    new Terminal.Gui.Color (color.R, color.G, color.B)
+                    )); // Setting color based on RGB
+
+
+            AddRune (x, 0, new Rune ('█'));
+        }
+    }
+}