mirror of https://github.com/ppy/osu
91 lines
3.6 KiB
C#
91 lines
3.6 KiB
C#
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
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// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using System;
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using System.Linq;
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using osu.Game.Beatmaps;
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using osu.Game.Rulesets.Difficulty;
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using osu.Game.Rulesets.Mods;
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using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
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using osu.Game.Rulesets.Osu.Difficulty.Skills;
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using osu.Game.Rulesets.Osu.Mods;
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using osu.Game.Rulesets.Osu.Objects;
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namespace osu.Game.Rulesets.Osu.Difficulty
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{
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public class OsuDifficultyCalculator : DifficultyCalculator
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{
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private const int section_length = 400;
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private const double difficulty_multiplier = 0.0675;
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public OsuDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
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: base(ruleset, beatmap)
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{
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}
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protected override DifficultyAttributes Calculate(IBeatmap beatmap, Mod[] mods, double timeRate)
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{
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if (!beatmap.HitObjects.Any())
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return new OsuDifficultyAttributes(mods, 0);
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OsuDifficultyBeatmap difficultyBeatmap = new OsuDifficultyBeatmap(beatmap.HitObjects.Cast<OsuHitObject>().ToList(), timeRate);
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Skill[] skills =
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{
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new Aim(),
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new Speed()
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};
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double sectionLength = section_length * timeRate;
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// The first object doesn't generate a strain, so we begin with an incremented section end
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double currentSectionEnd = 2 * sectionLength;
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foreach (OsuDifficultyHitObject h in difficultyBeatmap)
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{
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while (h.BaseObject.StartTime > currentSectionEnd)
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{
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foreach (Skill s in skills)
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{
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s.SaveCurrentPeak();
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s.StartNewSectionFrom(currentSectionEnd);
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}
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currentSectionEnd += sectionLength;
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}
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foreach (Skill s in skills)
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s.Process(h);
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}
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double aimRating = Math.Sqrt(skills[0].DifficultyValue()) * difficulty_multiplier;
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double speedRating = Math.Sqrt(skills[1].DifficultyValue()) * difficulty_multiplier;
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double starRating = aimRating + speedRating + Math.Abs(aimRating - speedRating) / 2;
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// Todo: These int casts are temporary to achieve 1:1 results with osu!stable, and should be removed in the future
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double hitWindowGreat = (int)(beatmap.HitObjects.First().HitWindows.Great / 2) / timeRate;
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double preempt = (int)BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / timeRate;
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int maxCombo = beatmap.HitObjects.Count();
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// Add the ticks + tail of the slider. 1 is subtracted because the head circle would be counted twice (once for the slider itself in the line above)
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maxCombo += beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
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return new OsuDifficultyAttributes(mods, starRating)
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{
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AimStrain = aimRating,
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SpeedStrain = speedRating,
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ApproachRate = preempt > 1200 ? (1800 - preempt) / 120 : (1200 - preempt) / 150 + 5,
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OverallDifficulty = (80 - hitWindowGreat) / 6,
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MaxCombo = maxCombo
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};
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}
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protected override Mod[] DifficultyAdjustmentMods => new Mod[]
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{
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new OsuModDoubleTime(),
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new OsuModHalfTime(),
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new OsuModEasy(),
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new OsuModHardRock(),
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};
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}
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}
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