Add drum roll implementation

osu.Game.Rulesets.Taiko/Skinning/Argon/ArgonElongatedCirclePiece.cs

@@ -0,0 +1,33 @@
+// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
+// See the LICENCE file in the repository root for full licence text.
+
+using osu.Framework.Allocation;
+using osu.Framework.Graphics;
+using osu.Framework.Graphics.Colour;
+using osuTK.Graphics;
+
+namespace osu.Game.Rulesets.Taiko.Skinning.Argon
+{
+    public class ArgonElongatedCirclePiece : ArgonCirclePiece
+    {
+        public ArgonElongatedCirclePiece()
+        {
+            RelativeSizeAxes = Axes.Y;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            AccentColour = ColourInfo.GradientVertical(
+                new Color4(241, 161, 0, 255),
+                new Color4(167, 111, 0, 255)
+            );
+        }
+
+        protected override void Update()
+        {
+            base.Update();
+            Width = Parent.DrawSize.X + DrawHeight;
+        }
+    }
+}

osu.Game.Rulesets.Taiko/Skinning/Argon/RingPiece.cs

@@ -34,7 +34,7 @@ namespace osu.Game.Rulesets.Taiko.Skinning.Argon
         protected override void Update()
         {
             base.Update();
-            BorderThickness = relativeBorderThickness * DrawSize.X;
+            BorderThickness = relativeBorderThickness * DrawSize.Y;
         }
     }
 }

osu.Game.Rulesets.Taiko/Skinning/Argon/TaikoArgonSkinTransformer.cs

@@ -38,6 +38,9 @@ namespace osu.Game.Rulesets.Taiko.Skinning.Argon
 
                         case TaikoSkinComponents.BarLine:
                             return new ArgonBarLine();
+
+                        case TaikoSkinComponents.DrumRollBody:
+                            return new ArgonElongatedCirclePiece();
                     }
 
                     break;