OkLAB test in uitest

I can just add whatever random shit I want in there, nobody will stop me

Author: PJB3005

Robust.Client/Console/Commands/UITestCommand.cs

@@ -158,6 +158,7 @@ public UITestControl()
         _tabContainer.AddChild(_sprite);
         _tabContainer.AddChild(TabCursorShapes());
         _tabContainer.AddChild(new TabWrapContainer { Name = nameof(Tab.WrapContainer) });
+        _tabContainer.AddChild(new TabOkLab());
     }
 
     public void OnClosed()

Robust.Client/Console/Commands/UITestControl.TabOkLab.cs

@@ -0,0 +1,153 @@
+using System.Collections.Generic;
+using System.Numerics;
+using System.Text;
+using Robust.Client.Graphics;
+using Robust.Client.UserInterface;
+using Robust.Client.UserInterface.Controls;
+using Robust.Shared.Maths;
+
+namespace Robust.Client.Console.Commands;
+
+internal sealed partial class UITestControl
+{
+    private sealed class TabOkLab : Control
+    {
+        public TabOkLab()
+        {
+            string[] colors = ["#d52800", "#fd9954", "#ffffff", "#d261a3", "#a30061"];
+
+            var controls = new List<ColorControl>();
+            var box = new BoxContainer { Orientation = BoxContainer.LayoutOrientation.Horizontal };
+
+            foreach (var c in colors)
+            {
+                var control = new ColorControl(c);
+                controls.Add(control);
+                box.AddChild(control);
+            }
+
+            var slider = new Slider
+            {
+                MaxValue = 1,
+                Value = 0.85f,
+            };
+
+            var slider2 = new Slider
+            {
+                MaxValue = 1,
+                Value = 1,
+            };
+
+            slider.OnValueChanged += _ => UpdateValue();
+            slider2.OnValueChanged += _ => UpdateValue();
+            UpdateValue();
+
+            AddChild(new BoxContainer
+            {
+                Orientation = BoxContainer.LayoutOrientation.Vertical,
+                Children =
+                {
+                    slider,
+                    slider2,
+                    box
+                }
+            });
+
+            return;
+
+            void UpdateValue()
+            {
+                foreach (var control in controls)
+                {
+                    var sb = new StringBuilder();
+
+                    var origLab = Color.ToLab(Color.FromSrgb(control.OrigColor));
+
+                    sb.AppendLine($"ORIG:\n{control.OrigColor.ToHex()}");
+                    sb.AppendLine($"LAB:\n{origLab}");
+
+                    var lch = Color.ToLch(origLab);
+                    sb.AppendLine($"LCH:\n{lch}");
+
+                    lch = Color.ToLch(origLab);
+                    lch.X *= slider.Value;
+                    lch.Y *= slider2.Value;
+
+                    var newLab = Color.FromLch(lch);
+
+                    var newColor = Color.ToSrgb(Color.FromLab(newLab));
+
+                    sb.AppendLine($"NEW:\n{newColor.ToHex()}");
+                    sb.AppendLine($"LAB:\n{newLab}");
+                    sb.AppendLine($"LCH:\n{lch}");
+
+                    control.DataLabel.Text = sb.ToString();
+
+                    var newLab2 = Vector4.Lerp(new Vector4(0, 0, 0, 1), origLab, slider.Value);
+
+                    control.PanelModifiedLightnessNaive.BackgroundColor = newColor;
+                    control.PanelModifiedScaleAll.BackgroundColor = Color.ToSrgb(Color.FromLab(newLab2));
+                }
+            }
+        }
+
+        private sealed class ColorControl : Control
+        {
+            public readonly StyleBoxFlat PanelModifiedLightnessNaive = new();
+            public readonly StyleBoxFlat PanelModifiedScaleAll = new();
+            public readonly Label DataLabel = new();
+            public readonly Color OrigColor;
+
+            public ColorControl(string color)
+            {
+                HorizontalExpand = true;
+
+                OrigColor = Color.FromHex(color);
+
+                var panelSize = new Vector2(200, 200);
+
+                AddChild(new BoxContainer
+                {
+                    Orientation = BoxContainer.LayoutOrientation.Vertical,
+                    Children =
+                    {
+                        new AspectRatioPanel
+                        {
+                            Children =
+                            {
+                                new PanelContainer
+                                {
+                                    PanelOverride = new StyleBoxFlat(OrigColor),
+                                    MinSize = panelSize
+                                },
+                            }
+                        },
+                        DataLabel,
+                        new AspectRatioPanel
+                        {
+                            Children =
+                            {
+                                new PanelContainer
+                                {
+                                    PanelOverride = PanelModifiedLightnessNaive,
+                                    MinSize = panelSize
+                                },
+                            }
+                        },
+                        new AspectRatioPanel
+                        {
+                            Children =
+                            {
+                                new PanelContainer
+                                {
+                                    PanelOverride = PanelModifiedScaleAll,
+                                    MinSize = panelSize
+                                },
+                            }
+                        },
+                    }
+                });
+            }
+        }
+    }
+}