mirror of https://github.com/ppy/osu
87 lines
3.6 KiB
C#
87 lines
3.6 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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using System;
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using System.Collections.Generic;
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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.Difficulty.Preprocessing;
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using osu.Game.Rulesets.Difficulty.Skills;
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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 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 CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
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{
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if (beatmap.HitObjects.Count == 0)
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return new OsuDifficultyAttributes { Mods = mods, Skills = skills };
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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) / clockRate;
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double preempt = (int)BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
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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
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{
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StarRating = starRating,
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Mods = mods,
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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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Skills = skills
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};
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}
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protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
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{
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// The first jump is formed by the first two hitobjects of the map.
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// If the map has less than two OsuHitObjects, the enumerator will not return anything.
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for (int i = 1; i < beatmap.HitObjects.Count; i++)
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{
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var lastLast = i > 1 ? beatmap.HitObjects[i - 2] : null;
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var last = beatmap.HitObjects[i - 1];
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var current = beatmap.HitObjects[i];
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yield return new OsuDifficultyHitObject(current, lastLast, last, clockRate);
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}
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}
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protected override Skill[] CreateSkills(IBeatmap beatmap) => new Skill[]
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{
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new Aim(),
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new Speed()
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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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