mirror of https://github.com/ppy/osu
64 lines
2.2 KiB
C#
64 lines
2.2 KiB
C#
// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
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// See the LICENCE file in the repository root for full licence text.
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#nullable enable
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using System;
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using System.Linq;
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using osu.Framework.Utils;
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using osu.Game.Beatmaps;
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using osu.Game.Rulesets.Mods;
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using osu.Game.Rulesets.Objects;
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using osu.Game.Rulesets.Osu.Beatmaps;
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using osu.Game.Rulesets.Osu.UI;
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using osu.Game.Rulesets.Osu.Utils;
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namespace osu.Game.Rulesets.Osu.Mods
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{
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/// <summary>
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/// Mod that randomises the positions of the <see cref="HitObject"/>s
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/// </summary>
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public class OsuModRandom : ModRandom, IApplicableToBeatmap
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{
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public override string Description => "It never gets boring!";
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private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast;
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private Random? rng;
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public void ApplyToBeatmap(IBeatmap beatmap)
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{
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if (!(beatmap is OsuBeatmap osuBeatmap))
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return;
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Seed.Value ??= RNG.Next();
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rng = new Random((int)Seed.Value);
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var positionInfos = OsuHitObjectGenerationUtils.GeneratePositionInfos(osuBeatmap.HitObjects);
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float rateOfChangeMultiplier = 0;
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foreach (var positionInfo in positionInfos)
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{
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// rateOfChangeMultiplier only changes every 5 iterations in a combo
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// to prevent shaky-line-shaped streams
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if (positionInfo.HitObject.IndexInCurrentCombo % 5 == 0)
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rateOfChangeMultiplier = (float)rng.NextDouble() * 2 - 1;
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if (positionInfo == positionInfos.First())
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{
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positionInfo.DistanceFromPrevious = (float)(rng.NextDouble() * OsuPlayfield.BASE_SIZE.X / 2);
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positionInfo.RelativeAngle = (float)(rng.NextDouble() * 2 * Math.PI - Math.PI);
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}
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else
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{
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positionInfo.RelativeAngle = rateOfChangeMultiplier * 2 * (float)Math.PI * Math.Min(1f, positionInfo.DistanceFromPrevious / (playfield_diagonal * 0.5f));
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}
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}
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osuBeatmap.HitObjects = OsuHitObjectGenerationUtils.RepositionHitObjects(positionInfos);
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}
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}
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}
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