osu-lazer/osu.Game.Rulesets.Mania/Mods/ManiaModRandom.cs

// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System.Linq;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Framework.MathUtils;
using osu.Game.Beatmaps;
using osu.Game.Graphics;
using osu.Game.Rulesets.Mania.Beatmaps;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Mods;

namespace osu.Game.Rulesets.Mania.Mods
{
    public class ManiaModRandom : Mod, IApplicableToBeatmap<ManiaHitObject>
    {
        public override string Name => "Random";
        public override string Acronym => "RD";
        public override ModType Type => ModType.Conversion;
        public override FontAwesome Icon => FontAwesome.fa_osu_dice;
        public override string Description => @"Shuffle around the keys!";
        public override double ScoreMultiplier => 1;

        public void ApplyToBeatmap(Beatmap<ManiaHitObject> beatmap)
        {
            var availableColumns = ((ManiaBeatmap)beatmap).TotalColumns;
            var shuffledColumns = Enumerable.Range(0, availableColumns).OrderBy(item => RNG.Next()).ToList();

            beatmap.HitObjects.OfType<ManiaHitObject>().ForEach(h => h.Column = shuffledColumns[h.Column]);
        }
    }
}