fix codefactor warnings and derive ModWindUp and ModWindDown to ModTimeRamp

osu.Game/Rulesets/Mods/ModTimeRamp.cs

@@ -0,0 +1,46 @@
+// 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 System;
+using osu.Framework.Audio;
+using osu.Framework.Timing;
+using osu.Game.Beatmaps;
+using osu.Game.Rulesets.UI;
+using osu.Game.Rulesets.Objects;
+using osu.Game.Rulesets.Objects.Types;
+
+namespace osu.Game.Rulesets.Mods
+{
+    public abstract class ModTimeRamp : Mod
+    {
+        public override Type[] IncompatibleMods => new[] { typeof(ModDoubleTime), typeof(ModHalfTime) };
+        public abstract double AppendRate { get; }
+    }
+
+    public abstract class ModTimeRamp<T> : ModTimeRamp, IUpdatableByPlayfield, IApplicableToClock, IApplicableToBeatmap<T>
+        where T : HitObject
+    {
+        private double lastObjectEndTime;
+        private IAdjustableClock clock;
+        private IHasPitchAdjust pitchAdjust;
+
+        public virtual void ApplyToClock(IAdjustableClock clk)
+        {
+            clock = clk;
+            pitchAdjust = clk as IHasPitchAdjust;
+        }
+
+        public virtual void ApplyToBeatmap(Beatmap<T> beatmap)
+        {
+            HitObject lastObject = beatmap.HitObjects[beatmap.HitObjects.Count - 1];
+            lastObjectEndTime = (lastObject as IHasEndTime)?.EndTime ?? lastObject?.StartTime ?? 0;
+        }
+
+        public virtual void Update(Playfield playfield)
+        {
+            double newRate = 1 + (AppendRate * (clock.CurrentTime / lastObjectEndTime));
+            clock.Rate = newRate;
+            pitchAdjust.PitchAdjust = newRate;
+        }
+    }
+}