From 7be5c638e46b14db6b8a9257e5e47bd17ebb5d1a Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Wed, 20 Jul 2022 00:22:31 +0900
Subject: [PATCH] Fix floating mouse position not running correctly in single
 thread mode

Noticed while testing on iOS. Previously, the interpolation was being
done in input handling but using the update thread clock, leading to
incorrect application.
---
 osu.Game/Graphics/Cursor/MenuCursor.cs | 34 +++++++++++++++++---------
 1 file changed, 22 insertions(+), 12 deletions(-)

diff --git a/osu.Game/Graphics/Cursor/MenuCursor.cs b/osu.Game/Graphics/Cursor/MenuCursor.cs
index 10ed76ebdd..862a10208c 100644
--- a/osu.Game/Graphics/Cursor/MenuCursor.cs
+++ b/osu.Game/Graphics/Cursor/MenuCursor.cs
@@ -3,21 +3,21 @@
 
 #nullable disable
 
-using osuTK;
+using System;
+using JetBrains.Annotations;
 using osu.Framework.Allocation;
+using osu.Framework.Audio;
+using osu.Framework.Audio.Sample;
+using osu.Framework.Bindables;
 using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
 using osu.Framework.Graphics.Cursor;
 using osu.Framework.Graphics.Sprites;
-using osu.Game.Configuration;
-using System;
-using JetBrains.Annotations;
-using osu.Framework.Audio;
-using osu.Framework.Audio.Sample;
-using osu.Framework.Bindables;
 using osu.Framework.Graphics.Textures;
 using osu.Framework.Input.Events;
 using osu.Framework.Utils;
+using osu.Game.Configuration;
+using osuTK;
 
 namespace osu.Game.Graphics.Cursor
 {
@@ -35,6 +35,7 @@ namespace osu.Game.Graphics.Cursor
         private Vector2 positionMouseDown;
 
         private Sample tapSample;
+        private Vector2 lastMovePosition;
 
         [BackgroundDependencyLoader(true)]
         private void load([NotNull] OsuConfigManager config, [CanBeNull] ScreenshotManager screenshotManager, AudioManager audio)
@@ -47,16 +48,25 @@ namespace osu.Game.Graphics.Cursor
             tapSample = audio.Samples.Get(@"UI/cursor-tap");
         }
 
+        protected override void Update()
+        {
+            base.Update();
+
+            if (dragRotationState != DragRotationState.NotDragging
+                && Vector2.Distance(positionMouseDown, lastMovePosition) > 60)
+            {
+                // make the rotation centre point floating.
+                positionMouseDown = Interpolation.ValueAt(0.04f, positionMouseDown, lastMovePosition, 0, Clock.ElapsedFrameTime);
+            }
+        }
+
         protected override bool OnMouseMove(MouseMoveEvent e)
         {
             if (dragRotationState != DragRotationState.NotDragging)
             {
-                // make the rotation centre point floating.
-                if (Vector2.Distance(positionMouseDown, e.MousePosition) > 60)
-                    positionMouseDown = Interpolation.ValueAt(0.005f, positionMouseDown, e.MousePosition, 0, Clock.ElapsedFrameTime);
+                lastMovePosition = e.MousePosition;
 
-                var position = e.MousePosition;
-                float distance = Vector2Extensions.Distance(position, positionMouseDown);
+                float distance = Vector2Extensions.Distance(lastMovePosition, positionMouseDown);
 
                 // don't start rotating until we're moved a minimum distance away from the mouse down location,
                 // else it can have an annoying effect.