Major rsefinements to taiko drawable classes.

osu.Game.Modes.Taiko/Objects/Drawables/Pieces/TickPiece.cs

@@ -0,0 +1,60 @@
+// 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.Framework.Graphics;
+using osu.Framework.Graphics.Containers;
+using osu.Framework.Graphics.Sprites;
+using OpenTK;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Taiko.Objects.Drawables.Pieces
+{
+    public class TickPiece : TaikoPiece
+    {
+        /// <summary>
+        /// Any tick that is not the first for a drumroll is not filled, but is instead displayed
+        /// as a hollow circle. This is what controls the border width of that circle.
+        /// </summary>
+        private const float tick_border_width = TaikoHitObject.CIRCLE_RADIUS / 2 / 4;
+
+        /// <summary>
+        /// The size of a tick.
+        /// </summary>
+        private const float tick_size = TaikoHitObject.CIRCLE_RADIUS / 2;
+
+        private bool filled;
+        public bool Filled
+        {
+            get { return filled; }
+            set
+            {
+                filled = value;
+                fillBox.Alpha = filled ? 1 : 0;
+            }
+        }
+
+        private readonly Box fillBox;
+
+        public TickPiece()
+        {
+            Size = new Vector2(tick_size);
+
+            Add(new CircularContainer
+            {
+                RelativeSizeAxes = Axes.Both,
+                Masking = true,
+                BorderThickness = tick_border_width,
+                BorderColour = Color4.White,
+                Children = new[]
+                {
+                    fillBox = new Box
+                    {
+                        RelativeSizeAxes = Axes.Both,
+                        Alpha = 0,
+                        AlwaysPresent = true
+                    }
+                }
+            });
+        }
+    }
+}