From 0219815a46455f2e87527d5fc283c662ba19ed70 Mon Sep 17 00:00:00 2001
From: cdwcgt <cdwcgt@cdwcgt.top>
Date: Tue, 21 Nov 2023 07:58:46 +0900
Subject: [PATCH] add TaikoModColorBind

---
 .../Mods/TestSceneTaikoModColorBind.cs        | 19 +++++
 .../Mods/TaikoModColorBind.cs                 | 72 +++++++++++++++++++
 .../Mods/TaikoModHidden.cs                    |  4 ++
 osu.Game.Rulesets.Taiko/TaikoRuleset.cs       |  1 +
 4 files changed, 96 insertions(+)
 create mode 100644 osu.Game.Rulesets.Taiko.Tests/Mods/TestSceneTaikoModColorBind.cs
 create mode 100644 osu.Game.Rulesets.Taiko/Mods/TaikoModColorBind.cs

diff --git a/osu.Game.Rulesets.Taiko.Tests/Mods/TestSceneTaikoModColorBind.cs b/osu.Game.Rulesets.Taiko.Tests/Mods/TestSceneTaikoModColorBind.cs
new file mode 100644
index 0000000000..ac787fad45
--- /dev/null
+++ b/osu.Game.Rulesets.Taiko.Tests/Mods/TestSceneTaikoModColorBind.cs
@@ -0,0 +1,19 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using NUnit.Framework;
+using osu.Game.Rulesets.Taiko.Mods;
+
+namespace osu.Game.Rulesets.Taiko.Tests.Mods
+{
+    public partial class TestSceneTaikoModColorBind : TaikoModTestScene
+    {
+        [Test]
+        public void TestColorBind() => CreateModTest(new ModTestData
+        {
+            Mod = new TaikoModColorBind(),
+            Autoplay = true,
+            PassCondition = () => true,
+        });
+    }
+}
diff --git a/osu.Game.Rulesets.Taiko/Mods/TaikoModColorBind.cs b/osu.Game.Rulesets.Taiko/Mods/TaikoModColorBind.cs
new file mode 100644
index 0000000000..f52f40d9e1
--- /dev/null
+++ b/osu.Game.Rulesets.Taiko/Mods/TaikoModColorBind.cs
@@ -0,0 +1,72 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using System;
+using osu.Framework.Graphics;
+using osu.Framework.Localisation;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Rulesets.Taiko.Objects;
+using osu.Game.Rulesets.Taiko.Objects.Drawables;
+using osu.Game.Rulesets.Taiko.UI;
+using osu.Game.Rulesets.UI;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Taiko.Mods
+{
+    public class TaikoModColorBind : ModWithVisibilityAdjustment, IApplicableToDrawableRuleset<TaikoHitObject>
+    {
+        public override string Name => "ColorBind";
+        public override string Acronym => "CB";
+
+        public override LocalisableString Description => @"What these notes color?";
+
+        public override double ScoreMultiplier => 1.03;
+
+        public override ModType Type => ModType.DifficultyIncrease;
+
+        public override Type[] IncompatibleMods => new[] { typeof(TaikoModHidden) };
+
+        /// <summary>
+        /// How far away from the hit target should hitobjects start to lose color.
+        /// Range: [0, 1]
+        /// </summary>
+        private const float fade_out_start_time = 1f;
+
+        /// <summary>
+        /// How long hitobjects take to lose color, in terms of the scrolling length.
+        /// Range: [0, 1]
+        /// </summary>
+        private const float fade_out_duration = 0.375f;
+
+        private DrawableTaikoRuleset drawableRuleset = null!;
+
+        public void ApplyToDrawableRuleset(DrawableRuleset<TaikoHitObject> drawableRuleset)
+        {
+            this.drawableRuleset = (DrawableTaikoRuleset)drawableRuleset;
+        }
+
+        protected override void ApplyIncreasedVisibilityState(DrawableHitObject hitObject, ArmedState state)
+        {
+            ApplyNormalVisibilityState(hitObject, state);
+        }
+
+        protected override void ApplyNormalVisibilityState(DrawableHitObject hitObject, ArmedState state)
+        {
+            switch (hitObject)
+            {
+                case DrawableHit:
+                    double preempt = drawableRuleset.TimeRange.Value / drawableRuleset.ControlPointAt(hitObject.HitObject.StartTime).Multiplier;
+                    double start = hitObject.HitObject.StartTime - preempt * fade_out_start_time;
+                    double duration = preempt * fade_out_duration;
+
+                    using (hitObject.BeginAbsoluteSequence(start))
+                    {
+                        hitObject.TransformBindableTo(hitObject.AccentColour, Color4.Gray, duration);
+                    }
+
+                    break;
+            }
+        }
+    }
+}
diff --git a/osu.Game.Rulesets.Taiko/Mods/TaikoModHidden.cs b/osu.Game.Rulesets.Taiko/Mods/TaikoModHidden.cs
index 2c3b4a8d18..8afd8d2696 100644
--- a/osu.Game.Rulesets.Taiko/Mods/TaikoModHidden.cs
+++ b/osu.Game.Rulesets.Taiko/Mods/TaikoModHidden.cs
@@ -1,6 +1,8 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
+using System;
+using System.Linq;
 using osu.Framework.Graphics;
 using osu.Framework.Localisation;
 using osu.Game.Rulesets.Mods;
@@ -19,6 +21,8 @@ namespace osu.Game.Rulesets.Taiko.Mods
         public override LocalisableString Description => @"Beats fade out before you hit them!";
         public override double ScoreMultiplier => UsesDefaultConfiguration ? 1.06 : 1;
 
+        public override Type[] IncompatibleMods => base.IncompatibleMods.Append(typeof(TaikoModColorBind)).ToArray();
+
         /// <summary>
         /// How far away from the hit target should hitobjects start to fade out.
         /// Range: [0, 1]
diff --git a/osu.Game.Rulesets.Taiko/TaikoRuleset.cs b/osu.Game.Rulesets.Taiko/TaikoRuleset.cs
index 072653dcbf..6427e57856 100644
--- a/osu.Game.Rulesets.Taiko/TaikoRuleset.cs
+++ b/osu.Game.Rulesets.Taiko/TaikoRuleset.cs
@@ -152,6 +152,7 @@ namespace osu.Game.Rulesets.Taiko
                         new MultiMod(new TaikoModDoubleTime(), new TaikoModNightcore()),
                         new TaikoModHidden(),
                         new TaikoModFlashlight(),
+                        new TaikoModColorBind(),
                         new ModAccuracyChallenge(),
                     };