// 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 System.Linq; using osu.Framework.Utils; using osu.Game.Beatmaps; using osu.Game.Rulesets.Mods; using osu.Game.Rulesets.Objects; using osu.Game.Rulesets.Osu.Beatmaps; using osu.Game.Rulesets.Osu.UI; using osu.Game.Rulesets.Osu.Utils; namespace osu.Game.Rulesets.Osu.Mods { /// <summary> /// Mod that randomises the positions of the <see cref="HitObject"/>s /// </summary> public class OsuModRandom : ModRandom, IApplicableToBeatmap { public override string Description => "It never gets boring!"; public override Type[] IncompatibleMods => base.IncompatibleMods.Append(typeof(OsuModTarget)).ToArray(); private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast; private Random? rng; public void ApplyToBeatmap(IBeatmap beatmap) { if (!(beatmap is OsuBeatmap osuBeatmap)) return; Seed.Value ??= RNG.Next(); rng = new Random((int)Seed.Value); var positionInfos = OsuHitObjectGenerationUtils.GeneratePositionInfos(osuBeatmap.HitObjects); float rateOfChangeMultiplier = 0; foreach (var positionInfo in positionInfos) { // rateOfChangeMultiplier only changes every 5 iterations in a combo // to prevent shaky-line-shaped streams if (positionInfo.HitObject.IndexInCurrentCombo % 5 == 0) rateOfChangeMultiplier = (float)rng.NextDouble() * 2 - 1; if (positionInfo == positionInfos.First()) { positionInfo.DistanceFromPrevious = (float)(rng.NextDouble() * OsuPlayfield.BASE_SIZE.Y / 2); positionInfo.RelativeAngle = (float)(rng.NextDouble() * 2 * Math.PI - Math.PI); } else { positionInfo.RelativeAngle = rateOfChangeMultiplier * 2 * (float)Math.PI * Math.Min(1f, positionInfo.DistanceFromPrevious / (playfield_diagonal * 0.5f)); } } osuBeatmap.HitObjects = OsuHitObjectGenerationUtils.RepositionHitObjects(positionInfos); } } }