Add basic beat response to osu! logo

osu.Game/Graphics/Containers/BeatSyncedContainer.cs

@@ -16,12 +16,19 @@ namespace osu.Game.Graphics.Containers
         private int lastBeat;
         private ControlPoint lastControlPoint;
 
+        /// <summary>
+        /// The amount of time before a beat we should fire <see cref="OnNewBeat(int, double, TimeSignatures, bool)"/>.
+        /// This allows for adding easing to animations that may be synchronised to the beat.
+        /// </summary>
+        protected double EarlyActivationMilliseconds;
+
         protected override void Update()
         {
             if (beatmap.Value?.Track == null)
                 return;
 
-            double currentTrackTime = beatmap.Value.Track.CurrentTime;
+            double currentTrackTime = beatmap.Value.Track.CurrentTime + EarlyActivationMilliseconds;
+
             ControlPoint overridePoint;
             ControlPoint controlPoint = beatmap.Value.Beatmap.TimingInfo.TimingPointAt(currentTrackTime, out overridePoint);
 

osu.Game/Screens/Menu/OsuLogo.cs

@@ -12,21 +12,24 @@ using osu.Framework.Graphics.Textures;
 using osu.Framework.Input;
 using osu.Game.Graphics;
 using osu.Game.Graphics.Backgrounds;
+using osu.Game.Graphics.Containers;
 using OpenTK;
 using OpenTK.Graphics;
+using osu.Game.Beatmaps.Timing;
 
 namespace osu.Game.Screens.Menu
 {
     /// <summary>
     /// osu! logo and its attachments (pulsing, visualiser etc.)
     /// </summary>
-    public class OsuLogo : Container
+    public class OsuLogo : BeatSyncedContainer
     {
         public readonly Color4 OsuPink = OsuColour.FromHex(@"e967a1");
 
         private readonly Sprite logo;
         private readonly CircularContainer logoContainer;
         private readonly Container logoBounceContainer;
+        private readonly Container logoBeatContainer;
         private readonly Container logoHoverContainer;
 
         private SampleChannel sampleClick;
@@ -67,8 +70,12 @@ namespace osu.Game.Screens.Menu
 
         private const float default_size = 480;
 
+        private const double beat_in_time = 60;
+
         public OsuLogo()
         {
+            EarlyActivationMilliseconds = beat_in_time;
+
             Size = new Vector2(default_size);
 
             Anchor = Anchor.Centre;
@@ -76,6 +83,11 @@ namespace osu.Game.Screens.Menu
 
             AutoSizeAxes = Axes.Both;
 
+            Children = new Drawable[]
+            {
+                logoBeatContainer  = new Container
+                {
+                    AutoSizeAxes = Axes.Both,
                     Children = new Drawable[]
                     {
                         logoBounceContainer = new Container
@@ -186,6 +198,8 @@ namespace osu.Game.Screens.Menu
                                 }
                             }
                         }
+                    }
+                }
             };
         }
 
@@ -206,6 +220,15 @@ namespace osu.Game.Screens.Menu
             ripple.Loop(300);
         }
 
+        protected override void OnNewBeat(int newBeat, double beatLength, TimeSignatures timeSignature, bool kiai)
+        {
+            base.OnNewBeat(newBeat, beatLength, timeSignature, kiai);
+
+            logoBeatContainer.ScaleTo(0.97f, beat_in_time, EasingTypes.Out);
+            using (logoBeatContainer.BeginDelayedSequence(beat_in_time))
+                logoBeatContainer.ScaleTo(1, beatLength * 2, EasingTypes.OutQuint);
+        }
+
         protected override bool OnMouseDown(InputState state, MouseDownEventArgs args)
         {
             if (!Interactive) return false;