Rewrite how swell circle piece is instantiated.

osu.Desktop.VisualTests/Tests/TestCaseTaikoHitObjects.cs

@@ -62,20 +62,16 @@ public override void Reset()
                 Position = new Vector2(350, 300)
             });
 
-            Add(new SwellCirclePiece(new CirclePiece
+            Add(new CirclePiece
             {
-                KiaiMode = kiai
-            })
-            {
-                Position = new Vector2(100, 500)
-            });
-
-            Add(new SwellCirclePiece(new StrongCirclePiece
-            {
-                KiaiMode = kiai
-            })
-            {
-                Position = new Vector2(350, 500)
+                Position = new Vector2(100, 500),
+                Width = 0,
+                AccentColour = Color4.Orange,
+                KiaiMode = kiai,
+                Children = new[]
+                {
+                    new SwellSymbolPiece()
+                }
             });
 
             Add(new DrumRollCircle(new CirclePiece()

osu.Game.Modes.Taiko/Objects/Drawable/DrawableSwell.cs

@@ -41,6 +41,8 @@ public class DrawableSwell : DrawableTaikoHitObject
         private readonly CircularContainer targetRing;
         private readonly CircularContainer innerRing;
 
+        private readonly CirclePiece circlePiece;
+
         private bool hasStarted;
 
         public DrawableSwell(Swell swell)
@@ -107,7 +109,13 @@ public DrawableSwell(Swell swell)
                                 }
                             }
                         },
-                        new SwellCirclePiece(new CirclePiece())
+                        circlePiece = new CirclePiece
+                        {
+                            Children = new []
+                            {
+                                new SwellSymbolPiece()
+                            }
+                        }
                     }
                 }
             };
@@ -116,6 +124,7 @@ public DrawableSwell(Swell swell)
         [BackgroundDependencyLoader]
         private void load(OsuColour colours)
         {
+            circlePiece.AccentColour = colours.YellowDark;
             innerRing.Colour = colours.YellowDark;
             targetRing.BorderColour = colours.YellowDark.Opacity(0.25f);
         }

osu.Game.Modes.Taiko/Objects/Drawable/Pieces/SwellSymbolPiece.cs

@@ -0,0 +1,23 @@
+// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
+// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Graphics;
+using osu.Framework.Graphics;
+
+namespace osu.Game.Modes.Taiko.Objects.Drawable.Pieces
+{
+    /// <summary>
+    /// The symbol used for swell pieces.
+    /// </summary>
+    public class SwellSymbolPiece : TextAwesome
+    {
+        public SwellSymbolPiece()
+        {
+            Anchor = Anchor.Centre;
+            Origin = Anchor.Centre;
+            TextSize = CirclePiece.SYMBOL_INNER_SIZE;
+            Icon = FontAwesome.fa_asterisk;
+            Shadow = false;
+        }
+    }
+}

osu.Game.Modes.Taiko/osu.Game.Modes.Taiko.csproj

@@ -58,9 +58,9 @@
     <Compile Include="Objects\Drawable\DrawableDrumRollTick.cs" />
     <Compile Include="Objects\Drawable\DrawableSwell.cs" />
     <Compile Include="Objects\Drawable\DrawableTaikoHitObject.cs" />
-    <Compile Include="Objects\Drawable\Pieces\SwellCirclePiece.cs" />
     <Compile Include="Objects\Drawable\Pieces\StrongCirclePiece.cs" />
     <Compile Include="Objects\Drawable\Pieces\CirclePiece.cs" />
+    <Compile Include="Objects\Drawable\Pieces\SwellSymbolPiece.cs" />
     <Compile Include="Objects\DrumRoll.cs" />
     <Compile Include="Objects\DrumRollTick.cs" />
     <Compile Include="Objects\Hit.cs" />
@@ -103,4 +103,4 @@
   <Target Name="AfterBuild">
   </Target>
   -->
-</Project>
+</Project>