From e9547542ead87b0f2df143f191daf0d4d74009e0 Mon Sep 17 00:00:00 2001
From: Dean Herbert <pe@ppy.sh>
Date: Fri, 10 Jun 2022 17:17:09 +0900
Subject: [PATCH] Add circle gameplay

---
 osu.Game/Screens/Utility/CircleGameplay.cs | 163 ++++++++++++++++++++-
 1 file changed, 162 insertions(+), 1 deletion(-)

diff --git a/osu.Game/Screens/Utility/CircleGameplay.cs b/osu.Game/Screens/Utility/CircleGameplay.cs
index 0667a54ced..abd7c40532 100644
--- a/osu.Game/Screens/Utility/CircleGameplay.cs
+++ b/osu.Game/Screens/Utility/CircleGameplay.cs
@@ -2,11 +2,172 @@
 // See the LICENCE file in the repository root for full licence text.
 
 #nullable enable
+using System;
+using System.Collections.Generic;
+using osu.Framework.Audio.Track;
+using osu.Framework.Graphics;
 using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Framework.Input.Events;
+using osu.Game.Beatmaps.ControlPoints;
+using osu.Game.Graphics;
+using osu.Game.Graphics.Containers;
+using osu.Game.Graphics.Sprites;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Scoring;
+using osuTK;
+using osuTK.Graphics;
 
 namespace osu.Game.Screens.Utility
 {
-    public class CircleGameplay : CompositeDrawable
+    public class CircleGameplay : BeatSyncedContainer
     {
+        private int nextLocation;
+
+        private OsuSpriteText unstableRate = null!;
+
+        private readonly List<HitEvent> hitEvents = new List<HitEvent>();
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            InternalChildren = new Drawable[]
+            {
+                unstableRate = new OsuSpriteText
+                {
+                    Anchor = Anchor.Centre,
+                    Origin = Anchor.Centre,
+                    Font = OsuFont.Default.With(size: 24)
+                }
+            };
+        }
+
+        protected override void OnNewBeat(int beatIndex, TimingControlPoint timingPoint, EffectControlPoint effectPoint, ChannelAmplitudes amplitudes)
+        {
+            base.OnNewBeat(beatIndex, timingPoint, effectPoint, amplitudes);
+
+            nextLocation++;
+
+            Vector2 location;
+
+            switch (nextLocation % 4)
+            {
+                default:
+                    location = new Vector2(0.25f, 0.25f);
+                    break;
+
+                case 1:
+                    location = new Vector2(0.75f, 0.75f);
+                    break;
+
+                case 2:
+                    location = new Vector2(0.75f, 0.25f);
+                    break;
+
+                case 3:
+                    location = new Vector2(0.25f, 0.75f);
+                    break;
+            }
+
+            AddInternal(new SampleHitCircle(Clock.CurrentTime + timingPoint.BeatLength)
+            {
+                RelativePositionAxes = Axes.Both,
+                Position = location,
+                Hit = hit,
+            });
+        }
+
+        private void hit(HitEvent h)
+        {
+            hitEvents.Add(h);
+            unstableRate.Text = $"{hitEvents.CalculateUnstableRate():N1}";
+        }
+
+        public class SampleHitCircle : CompositeDrawable
+        {
+            public HitEvent? HitEvent;
+
+            public Action<HitEvent>? Hit { get; set; }
+
+            public readonly double HitTime;
+
+            private readonly CircularContainer approach;
+            private readonly Circle circle;
+
+            private const float size = 100;
+
+            public SampleHitCircle(double hitTime)
+            {
+                HitTime = hitTime;
+
+                Origin = Anchor.Centre;
+
+                AutoSizeAxes = Axes.Both;
+
+                InternalChildren = new Drawable[]
+                {
+                    circle = new Circle
+                    {
+                        Colour = Color4.White,
+                        Size = new Vector2(size),
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                    },
+                    approach = new CircularContainer
+                    {
+                        BorderColour = Color4.Yellow,
+                        Size = new Vector2(size),
+                        Masking = true,
+                        BorderThickness = 4,
+                        Anchor = Anchor.Centre,
+                        Origin = Anchor.Centre,
+                        Children = new Drawable[]
+                        {
+                            new Box
+                            {
+                                Colour = Color4.Black,
+                                Alpha = 0,
+                                AlwaysPresent = true,
+                                RelativeSizeAxes = Axes.Both,
+                            },
+                        }
+                    },
+                };
+            }
+
+            protected override bool OnMouseDown(MouseDownEvent e)
+            {
+                if (HitEvent != null)
+                    return false;
+
+                approach.Expire();
+
+                circle
+                    .FadeOut(200)
+                    .ScaleTo(1.5f, 200);
+
+                HitEvent = new HitEvent(Clock.CurrentTime - HitTime, HitResult.Good, new HitObject
+                {
+                    HitWindows = new HitWindows(),
+                }, null, null);
+
+                Hit?.Invoke(HitEvent.Value);
+
+                this.Delay(200).Expire();
+
+                return true;
+            }
+
+            protected override void Update()
+            {
+                base.Update();
+
+                approach.Scale = new Vector2((float)MathHelper.Clamp((HitTime - Clock.CurrentTime) / 40, 1, 100));
+
+                if (Clock.CurrentTime > HitTime + 80)
+                    Expire();
+            }
+        }
     }
 }