Added "flip" mod for taiko

osu.Game.Rulesets.Taiko/Mods/TaikoModFlip.cs

@@ -0,0 +1,32 @@
+// 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.Graphics.Sprites;
+using osu.Game.Beatmaps;
+using osu.Game.Graphics;
+using osu.Game.Rulesets.Mods;
+using osu.Game.Rulesets.Taiko.Beatmaps;
+using osu.Game.Rulesets.Taiko.Objects;
+
+namespace osu.Game.Rulesets.Taiko.Mods
+{
+    public class TaikoModFlip : Mod, IApplicableToBeatmap
+    {
+        public override string Name => "Flip";
+        public override string Acronym => "FP";
+        public override string Description => @"Dons become kats, kats become dons";
+        public override ModType Type => ModType.Conversion;
+        public override double ScoreMultiplier => 1;
+
+        public void ApplyToBeatmap(IBeatmap beatmap)
+        {
+            var taikoBeatmap = (TaikoBeatmap)beatmap;
+
+            foreach (var obj in taikoBeatmap.HitObjects)
+            {
+                if (obj is Hit hit)
+                    hit.Type = hit.Type == HitType.Centre ? HitType.Rim : HitType.Centre; 
+            }
+        }
+    }
+}

osu.Game.Rulesets.Taiko/TaikoRuleset.cs

@@ -133,7 +133,7 @@ public override IEnumerable<Mod> GetModsFor(ModType type)
                 case ModType.Conversion:
                     return new Mod[]
                     {
-                        new TaikoModRandom(),
+                        new MultiMod(new TaikoModFlip(), new TaikoModRandom()),
                         new TaikoModDifficultyAdjust(),
                         new TaikoModClassic(),
                     };