Implement the accuracy circle

osu.Game/Screens/Ranking/Expanded/Accuracy/RankNotch.cs

@@ -0,0 +1,49 @@
+// 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.Containers;
+using osu.Framework.Graphics.Shapes;
+using osu.Game.Graphics;
+using osuTK;
+
+namespace osu.Game.Screens.Ranking.Expanded.Accuracy
+{
+    /// <summary>
+    /// A solid "notch" of the <see cref="AccuracyCircle"/> that appears at the ends of the rank circles to add separation.
+    /// </summary>
+    public class RankNotch : CompositeDrawable
+    {
+        private readonly float position;
+
+        public RankNotch(float position)
+        {
+            this.position = position;
+
+            RelativeSizeAxes = Axes.Both;
+        }
+
+        [BackgroundDependencyLoader]
+        private void load()
+        {
+            InternalChild = new Container
+            {
+                Anchor = Anchor.Centre,
+                Origin = Anchor.Centre,
+                RelativeSizeAxes = Axes.Both,
+                Rotation = position * 360f,
+                Child = new Box
+                {
+                    Anchor = Anchor.TopCentre,
+                    Origin = Anchor.TopCentre,
+                    RelativeSizeAxes = Axes.Y,
+                    Height = AccuracyCircle.RANK_CIRCLE_RADIUS,
+                    Width = 1f,
+                    Colour = OsuColour.Gray(0.3f),
+                    EdgeSmoothness = new Vector2(1f)
+                }
+            };
+        }
+    }
+}