Move play modes to their own projects.

osu.Game.Modes.Mania/UI/ManiaComboCounter.cs

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+//Copyright (c) 2007-2016 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.Transformations;
+using osu.Game.Modes.Taiko.UI;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Mania.UI
+{
+    /// <summary>
+    /// Similar to osu!taiko, with a pop-out animation when failing (rolling). Used in osu!mania.
+    /// </summary>
+    public class ManiaComboCounter : TaikoComboCounter
+    {
+        protected ushort KeysHeld = 0;
+
+        protected Color4 OriginalColour;
+
+        protected Color4 TintColour => Color4.Orange;
+        protected EasingTypes TintEasing => EasingTypes.None;
+        protected int TintDuration => 500;
+
+        protected Color4 PopOutColor => Color4.Red;
+        protected override float PopOutInitialAlpha => 1.0f;
+        protected override double PopOutDuration => 300;
+
+        protected override void LoadComplete()
+        {
+            base.LoadComplete();
+
+            PopOutSpriteText.Anchor = Anchor.BottomCentre;
+            PopOutSpriteText.Origin = Anchor.Centre;
+            PopOutSpriteText.FadeColour(PopOutColor, 0);
+            OriginalColour = DisplayedCountSpriteText.Colour;
+        }
+
+        protected override void OnCountRolling(ulong currentValue, ulong newValue)
+        {
+            if (!IsRolling && newValue < currentValue)
+            {
+                PopOutSpriteText.Text = FormatCount(currentValue);
+
+                PopOutSpriteText.FadeTo(PopOutInitialAlpha);
+                PopOutSpriteText.ScaleTo(1.0f);
+
+                PopOutSpriteText.FadeOut(PopOutDuration, PopOutEasing);
+                PopOutSpriteText.ScaleTo(PopOutScale, PopOutDuration, PopOutEasing);
+            }
+
+            base.OnCountRolling(currentValue, newValue);
+        }
+
+        /// <summary>
+        /// Tints text while holding a key.
+        /// </summary>
+        /// <remarks>
+        /// Does not alter combo. This has to be done depending of the scoring system.
+        /// (i.e. v1 = each period of time; v2 = when starting and ending a key hold)
+        /// </remarks>
+        public void HoldStart()
+        {
+            if (KeysHeld == 0)
+                DisplayedCountSpriteText.FadeColour(TintColour, TintDuration, TintEasing);
+            KeysHeld++;
+        }
+
+        /// <summary>
+        /// Ends tinting.
+        /// </summary>
+        public void HoldEnd()
+        {
+            KeysHeld--;
+            if (KeysHeld == 0)
+                DisplayedCountSpriteText.FadeColour(OriginalColour, TintDuration, TintEasing);
+        }
+    }
+}

osu.Game.Modes.Mania/UI/ManiaHitRenderer.cs

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+//Copyright (c) 2007-2016 ppy Pty Ltd <contact@ppy.sh>.
+//Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
+
+using osu.Game.Modes.Mania.Objects;
+using osu.Game.Modes.Objects;
+using osu.Game.Modes.UI;
+
+namespace osu.Game.Modes.Mania.UI
+{
+    public class ManiaHitRenderer : HitRenderer<ManiaBaseHit>
+    {
+        private readonly int columns;
+
+        public ManiaHitRenderer(int columns = 5)
+        {
+            this.columns = columns;
+        }
+
+        protected override HitObjectConverter<ManiaBaseHit> Converter => new ManiaConverter(columns);
+
+        protected override Playfield CreatePlayfield() => new ManiaPlayfield(columns);
+
+        protected override DrawableHitObject GetVisualRepresentation(ManiaBaseHit h)
+        {
+            return null;
+            //return new DrawableNote(h)
+            //{
+            //    Position = new Vector2((float)(h.Column + 0.5) / columns, -0.1f),
+            //    RelativePositionAxes = Axes.Both
+            //};
+        }
+    }
+}

osu.Game.Modes.Mania/UI/ManiaPlayfield.cs

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+//Copyright (c) 2007-2016 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.Sprites;
+using osu.Game.Modes.UI;
+using OpenTK;
+using OpenTK.Graphics;
+
+namespace osu.Game.Modes.Mania.UI
+{
+    public class ManiaPlayfield : Playfield
+    {
+        private readonly int columns;
+
+        public ManiaPlayfield(int columns)
+        {
+            this.columns = columns;
+            RelativeSizeAxes = Axes.Both;
+            Size = new Vector2(columns / 20f, 1f);
+            Anchor = Anchor.BottomCentre;
+            Origin = Anchor.BottomCentre;
+
+            Add(new Box { RelativeSizeAxes = Axes.Both, Alpha = 0.5f });
+
+            for (int i = 0; i < columns; i++)
+                Add(new Box()
+                {
+                    RelativeSizeAxes = Axes.Y,
+                    Size = new Vector2(2, 1),
+                    RelativePositionAxes = Axes.Both,
+                    Position = new Vector2((float)i / columns, 0),
+                    Alpha = 0.5f,
+                    Colour = Color4.Black
+                });
+        }
+    }
+}