Mode -> Ruleset.

osu.Game.Rulesets.Taiko/Objects/Drawables/Pieces/ElongatedCirclePiece.cs

@@ -0,0 +1,41 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using System;
+using osu.Framework.Graphics.Primitives;
+using osu.Game.Rulesets.Taiko.UI;
+
+namespace osu.Game.Rulesets.Taiko.Objects.Drawables.Pieces
+{
+    public class ElongatedCirclePiece : CirclePiece
+    {
+        /// <summary>
+        /// As we are being used to define the absolute size of hits, we need to be given a relative reference of our containing <see cref="TaikoPlayfield"/>.
+        /// </summary>
+        public Func<float> PlayfieldLengthReference;
+
+        /// <summary>
+        /// The length of this piece as a multiple of the value returned by <see cref="PlayfieldLengthReference"/>
+        /// </summary>
+        public float Length;
+
+        public ElongatedCirclePiece(bool isStrong = false) : base(isStrong)
+        {
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+
+            var padding = Content.DrawHeight * Content.Width / 2;
+
+            Content.Padding = new MarginPadding
+            {
+                Left = padding,
+                Right = padding,
+            };
+
+            Width = (PlayfieldLengthReference?.Invoke() ?? 0) * Length + DrawHeight;
+        }
+    }
+}