osu/osu.Game.Rulesets.Osu/Difficulty/OsuDifficultyCalculator.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.
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Difficulty;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Difficulty.Skills;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
using osu.Game.Rulesets.Osu.Difficulty.Skills;
using osu.Game.Rulesets.Osu.Mods;
using osu.Game.Rulesets.Osu.Objects;
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using osu.Game.Rulesets.Osu.Scoring;
using osu.Game.Rulesets.Scoring;
namespace osu.Game.Rulesets.Osu.Difficulty
{
public class OsuDifficultyCalculator : DifficultyCalculator
{
private const double difficulty_multiplier = 0.0675;
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private double hitWindowGreat;
public OsuDifficultyCalculator(Ruleset ruleset, WorkingBeatmap beatmap)
: base(ruleset, beatmap)
{
}
protected override DifficultyAttributes CreateDifficultyAttributes(IBeatmap beatmap, Mod[] mods, Skill[] skills, double clockRate)
{
if (beatmap.HitObjects.Count == 0)
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return new OsuDifficultyAttributes { Mods = mods, Skills = skills };
double aimRating = Math.Sqrt(skills[0].DifficultyValue()) * difficulty_multiplier;
double speedRating = Math.Sqrt(skills[1].DifficultyValue()) * difficulty_multiplier;
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double flashlightRating = Math.Sqrt(skills[2].DifficultyValue()) * difficulty_multiplier;
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double baseAimPerformance = Math.Pow(5 * Math.Max(1, aimRating / 0.0675) - 4, 3) / 100000;
double baseSpeedPerformance = Math.Pow(5 * Math.Max(1, speedRating / 0.0675) - 4, 3) / 100000;
double baseFlashlightPerformance = 0.0;
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if (mods.Any(h => h is OsuModFlashlight))
baseFlashlightPerformance = Math.Pow(flashlightRating, 2.0) * 25.0;
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double basePerformance =
Math.Pow(
Math.Pow(baseAimPerformance, 1.1) +
Math.Pow(baseSpeedPerformance, 1.1) +
Math.Pow(baseFlashlightPerformance, 1.1), 1.0 / 1.1
);
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double starRating = basePerformance > 0.00001 ? Math.Cbrt(1.12) * 0.027 * (Math.Cbrt(100000 / Math.Pow(2, 1 / 1.1) * basePerformance) + 4) : 0;
double preempt = (int)BeatmapDifficulty.DifficultyRange(beatmap.BeatmapInfo.BaseDifficulty.ApproachRate, 1800, 1200, 450) / clockRate;
int maxCombo = beatmap.HitObjects.Count;
// 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)
maxCombo += beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
int hitCirclesCount = beatmap.HitObjects.Count(h => h is HitCircle);
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int spinnerCount = beatmap.HitObjects.Count(h => h is Spinner);
return new OsuDifficultyAttributes
{
StarRating = starRating,
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Mods = mods,
AimStrain = aimRating,
SpeedStrain = speedRating,
FlashlightRating = flashlightRating,
ApproachRate = preempt > 1200 ? (1800 - preempt) / 120 : (1200 - preempt) / 150 + 5,
OverallDifficulty = (80 - hitWindowGreat) / 6,
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MaxCombo = maxCombo,
HitCircleCount = hitCirclesCount,
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SpinnerCount = spinnerCount,
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Skills = skills
};
}
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protected override IEnumerable<DifficultyHitObject> CreateDifficultyHitObjects(IBeatmap beatmap, double clockRate)
{
// The first jump is formed by the first two hitobjects of the map.
// If the map has less than two OsuHitObjects, the enumerator will not return anything.
for (int i = 1; i < beatmap.HitObjects.Count; i++)
{
var lastLast = i > 1 ? beatmap.HitObjects[i - 2] : null;
var last = beatmap.HitObjects[i - 1];
var current = beatmap.HitObjects[i];
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yield return new OsuDifficultyHitObject(current, lastLast, last, clockRate);
}
}
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protected override Skill[] CreateSkills(IBeatmap beatmap, Mod[] mods, double clockRate)
{
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HitWindows hitWindows = new OsuHitWindows();
hitWindows.SetDifficulty(beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty);
// Todo: These int casts are temporary to achieve 1:1 results with osu!stable, and should be removed in the future
hitWindowGreat = (int)(hitWindows.WindowFor(HitResult.Great)) / clockRate;
return new Skill[]
{
new Aim(mods),
new Speed(mods, hitWindowGreat),
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new Flashlight(mods)
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};
}
protected override Mod[] DifficultyAdjustmentMods => new Mod[]
{
new OsuModDoubleTime(),
new OsuModHalfTime(),
new OsuModEasy(),
new OsuModHardRock(),
new OsuModFlashlight(),
};
}
}