osu/osu.Game.Rulesets.Catch/Difficulty/CatchDifficultyCalculator.cs

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// 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.
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using System;
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using System.Collections.Generic;
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using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Catch.Difficulty.Preprocessing;
using osu.Game.Rulesets.Catch.Difficulty.Skills;
using osu.Game.Rulesets.Catch.Mods;
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using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Catch.UI;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
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namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchDifficultyCalculator : DifficultyCalculator
{
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private const double star_scaling_factor = 0.153;
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private float halfCatcherWidth;
public override int Version => 20220701;
public CatchDifficultyCalculator(IRulesetInfo ruleset, IWorkingBeatmap beatmap)
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: base(ruleset, beatmap)
{
}
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protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (beatmap.HitObjects.Count == 0)
return new CatchDifficultyAttributes { Mods = mods };
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// this is the same as osu!, so there's potential to share the implementation... maybe
double preempt = IBeatmapDifficultyInfo.DifficultyRange(beatmap.Difficulty.ApproachRate, 1800, 1200, 450) / clockRate;
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return new CatchDifficultyAttributes
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{
StarRating = Math.Sqrt(skills[0].DifficultyValue()) * star_scaling_factor,
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Mods = mods,
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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};
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}
protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
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{
CatchHitObject? lastObject = null;
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List<DifficultyHitObject> objects = new List<DifficultyHitObject>();
// In 2B beatmaps, it is possible that a normal Fruit is placed in the middle of a JuiceStream.
foreach (var hitObject in beatmap.HitObjects
.SelectMany(obj => obj is JuiceStream stream ? stream.NestedHitObjects.AsEnumerable() : new[] { obj })
.Cast<CatchHitObject>()
.OrderBy(x => x.StartTime))
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{
// We want to only consider fruits that contribute to the combo.
if (hitObject is BananaShower || hitObject is TinyDroplet)
continue;
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if (lastObject != null)
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objects.Add(new CatchDifficultyHitObject(hitObject, lastObject, clockRate, halfCatcherWidth, objects, objects.Count));
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lastObject = hitObject;
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}
return objects;
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}
protected override Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods, double clockRate)
{
halfCatcherWidth = Catcher.CalculateCatchWidth(beatmap.Difficulty) * 0.5f;
// For circle sizes above 5.5, reduce the catcher width further to simulate imperfect gameplay.
halfCatcherWidth *= 1 - (Math.Max(0, beatmap.Difficulty.CircleSize - 5.5f) * 0.0625f);
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return new Skill[]
{
new Movement(mods, halfCatcherWidth, clockRate),
};
}
protected override Mod[] DifficultyAdjustmentMods => new Mod[]
{
new CatchModDoubleTime(),
new CatchModHalfTime(),
new CatchModHardRock(),
new CatchModEasy(),
};
}
}