Basic implementation of hold notes (not finalized yet).

osu.Game.Rulesets.Mania/Objects/Drawables/DrawableHoldNote.cs

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+// 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.Game.Rulesets.Objects.Drawables;
+using osu.Framework.Graphics;
+using osu.Framework.Allocation;
+using osu.Game.Rulesets.Mania.Objects.Drawables.Pieces;
+using OpenTK.Graphics;
+
+namespace osu.Game.Rulesets.Mania.Objects.Drawables
+{
+    public class DrawableHoldNote : DrawableManiaHitObject<HoldNote>
+    {
+        /// <summary>
+        /// Length of this hold note, relative to its parent.
+        /// </summary>
+        public float Length;
+
+        private NotePiece headPiece;
+        private BodyPiece bodyPiece;
+        private NotePiece tailPiece;
+
+        public DrawableHoldNote(HoldNote hitObject)
+            : base(hitObject)
+        {
+            Children = new Drawable[]
+            {
+                headPiece = new NotePiece
+                {
+                    Anchor = Anchor.BottomCentre,
+                    Origin = Anchor.BottomCentre
+                },
+                bodyPiece = new BodyPiece
+                {
+                    Anchor = Anchor.BottomCentre,
+                    Origin = Anchor.BottomCentre,
+                },
+                tailPiece = new NotePiece
+                {
+                    Anchor = Anchor.BottomCentre,
+                    Origin = Anchor.BottomCentre
+                }
+            };
+        }
+
+        public override Color4 AccentColour
+        {
+            get { return AccentColour; }
+            set
+            {
+                if (base.AccentColour == value)
+                    return;
+                base.AccentColour = value;
+
+                headPiece.AccentColour = value;
+                bodyPiece.AccentColour = value;
+                tailPiece.AccentColour = value;
+            }
+        }
+
+
+        protected override void Update()
+        {
+            bodyPiece.Height = Parent.DrawSize.Y * Length;
+        }
+
+        protected override void UpdateState(ArmedState state)
+        {
+        }
+    }
+}