mirror of https://github.com/ppy/osu
94 lines
3.8 KiB
C#
94 lines
3.8 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.Catch.Difficulty.Preprocessing;
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using osu.Game.Rulesets.Catch.Difficulty.Skills;
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using osu.Game.Rulesets.Catch.Mods;
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using osu.Game.Rulesets.Catch.Objects;
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using osu.Game.Rulesets.Catch.UI;
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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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namespace osu.Game.Rulesets.Catch.Difficulty
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{
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public class CatchDifficultyCalculator : DifficultyCalculator
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{
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private const double star_scaling_factor = 0.153;
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protected override int SectionLength => 750;
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private float halfCatcherWidth;
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public CatchDifficultyCalculator(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 CatchDifficultyAttributes { Mods = mods, Skills = skills };
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// this is the same as osu!, so there's potential to share the implementation... maybe
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double preempt = BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
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return new CatchDifficultyAttributes
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{
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StarRating = Math.Sqrt(skills[0].DifficultyValue()) * star_scaling_factor,
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Mods = mods,
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ApproachRate = preempt > 1200.0 ? -(preempt - 1800.0) / 120.0 : -(preempt - 1200.0) / 150.0 + 5.0,
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MaxCombo = beatmap.HitObjects.Count(h => h is Fruit) + beatmap.HitObjects.OfType<JuiceStream>().SelectMany(j => j.NestedHitObjects).Count(h => !(h is TinyDroplet)),
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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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CatchHitObject lastObject = null;
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// In 2B beatmaps, it is possible that a normal Fruit is placed in the middle of a JuiceStream.
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foreach (var hitObject in beatmap.HitObjects
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.SelectMany(obj => obj is JuiceStream stream ? stream.NestedHitObjects : new[] { obj })
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.Cast<CatchHitObject>()
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.OrderBy(x => x.StartTime))
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{
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// We want to only consider fruits that contribute to the combo.
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if (hitObject is BananaShower || hitObject is TinyDroplet)
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continue;
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if (lastObject != null)
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yield return new CatchDifficultyHitObject(hitObject, lastObject, clockRate, halfCatcherWidth);
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lastObject = hitObject;
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}
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}
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protected override Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods)
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{
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halfCatcherWidth = Catcher.CalculateCatchWidth(beatmap.BeatmapInfo.BaseDifficulty) * 0.5f;
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// For circle sizes above 5.5, reduce the catcher width further to simulate imperfect gameplay.
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halfCatcherWidth *= 1 - (Math.Max(0, beatmap.BeatmapInfo.BaseDifficulty.CircleSize - 5.5f) * 0.0625f);
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return new Skill[]
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{
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new Movement(mods, halfCatcherWidth),
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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 CatchModDoubleTime(),
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new CatchModHalfTime(),
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new CatchModHardRock(),
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new CatchModEasy(),
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};
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}
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}
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