From e7c0e9834f41f5f52fb3b331a02c4742c84bf342 Mon Sep 17 00:00:00 2001
From: ekrctb <ekrctb@gmail.com>
Date: Wed, 2 Dec 2020 16:53:01 +0900
Subject: [PATCH] Introduce RandomSeed in catch DHO

---
 .../Drawables/DrawableCatchHitObject.cs       | 23 +++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/osu.Game.Rulesets.Catch/Objects/Drawables/DrawableCatchHitObject.cs b/osu.Game.Rulesets.Catch/Objects/Drawables/DrawableCatchHitObject.cs
index 1faa6a5b0f..eb5f9451b1 100644
--- a/osu.Game.Rulesets.Catch/Objects/Drawables/DrawableCatchHitObject.cs
+++ b/osu.Game.Rulesets.Catch/Objects/Drawables/DrawableCatchHitObject.cs
@@ -3,10 +3,13 @@
 
 using System;
 using JetBrains.Annotations;
+using osu.Framework.Allocation;
 using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Game.Rulesets.Catch.UI;
+using osu.Game.Rulesets.Objects;
 using osu.Game.Rulesets.Objects.Drawables;
+using osu.Game.Utils;
 
 namespace osu.Game.Rulesets.Catch.Objects.Drawables
 {
@@ -20,12 +23,32 @@ namespace osu.Game.Rulesets.Catch.Objects.Drawables
 
         protected override float SamplePlaybackPosition => HitObject.X / CatchPlayfield.WIDTH;
 
+        /// <summary>
+        /// The seed value used for visual randomness such as fruit rotation.
+        /// By default, <see cref="HitObject.StartTime"/> truncated to an integer is used.
+        /// </summary>
+        public Bindable<int> RandomSeed = new Bindable<int>();
+
         protected DrawableCatchHitObject([CanBeNull] CatchHitObject hitObject)
             : base(hitObject)
         {
             Anchor = Anchor.BottomLeft;
         }
 
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            StartTimeBindable.BindValueChanged(change =>
+            {
+                RandomSeed.Value = (int)change.NewValue;
+            }, true);
+        }
+
+        /// <summary>
+        /// Get a random number in range [0,1) based on seed <see cref="RandomSeed"/>.
+        /// </summary>
+        public float RandomSingle(int series) => StatelessRNG.NextSingle(RandomSeed.Value, series);
+
         protected override void OnApply()
         {
             base.OnApply();