osu/osu.Game.Rulesets.Osu/Scoring/OsuPerformanceCalculator.cs

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// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Osu.Mods;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Rulesets.Scoring;
namespace osu.Game.Rulesets.Osu.Scoring
{
public class OsuPerformanceCalculator : PerformanceCalculator
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{
private readonly int countHitCircles;
private readonly int beatmapMaxCombo;
private Mod[] mods;
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/// <summary>
/// Approach rate adjusted by mods.
/// </summary>
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private double realApproachRate;
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/// <summary>
/// Overall difficulty adjusted by mods.
/// </summary>
private double realOverallDifficulty;
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private double accuracy;
private int scoreMaxCombo;
private int count300;
private int count100;
private int count50;
private int countMiss;
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public OsuPerformanceCalculator(Ruleset ruleset, IBeatmap beatmap, Score score)
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: base(ruleset, beatmap, score)
{
countHitCircles = Beatmap.HitObjects.Count(h => h is HitCircle);
beatmapMaxCombo = Beatmap.HitObjects.Count();
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// Add the ticks + tail of the slider. 1 is subtracted because the "headcircle" would be counted twice (once for the slider itself in the line above)
beatmapMaxCombo += Beatmap.HitObjects.OfType<Slider>().Sum(s => s.NestedHitObjects.Count - 1);
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}
public override double Calculate(Dictionary<string, double> categoryRatings = null)
{
mods = Score.Mods;
accuracy = Score.Accuracy;
scoreMaxCombo = Score.MaxCombo;
count300 = Convert.ToInt32(Score.Statistics[HitResult.Great]);
count100 = Convert.ToInt32(Score.Statistics[HitResult.Good]);
count50 = Convert.ToInt32(Score.Statistics[HitResult.Meh]);
countMiss = Convert.ToInt32(Score.Statistics[HitResult.Miss]);
// Don't count scores made with supposedly unranked mods
if (mods.Any(m => !m.Ranked))
return 0;
// Todo: In the future we should apply changes to PreEmpt/AR at an OsuHitObject/BaseDifficulty level, but this is done
// locally for now as doing so would modify animations and other things unexpectedly
// DO NOT MODIFY THIS
double ar = Beatmap.BeatmapInfo.BaseDifficulty.ApproachRate;
if (mods.Any(m => m is OsuModHardRock))
ar = Math.Min(10, ar * 1.4);
if (mods.Any(m => m is OsuModEasy))
ar = Math.Max(0, ar / 2);
double preEmpt = BeatmapDifficulty.DifficultyRange(ar, 1800, 1200, 450) / TimeRate;
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double hitWindow300 = (Beatmap.HitObjects.First().HitWindows.Great / 2 - 0.5) / TimeRate;
realApproachRate = preEmpt > 1200 ? (1800 - preEmpt) / 120 : (1200 - preEmpt) / 150 + 5;
realOverallDifficulty = (80 - 0.5 - hitWindow300) / 6;
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// Custom multipliers for NoFail and SpunOut.
double multiplier = 1.12f; // This is being adjusted to keep the final pp value scaled around what it used to be when changing things
if (mods.Any(m => m is OsuModNoFail))
multiplier *= 0.90f;
if (mods.Any(m => m is OsuModSpunOut))
multiplier *= 0.95f;
double aimValue = computeAimValue();
double speedValue = computeSpeedValue();
double accuracyValue = computeAccuracyValue();
double totalValue =
Math.Pow(
Math.Pow(aimValue, 1.1f) +
Math.Pow(speedValue, 1.1f) +
Math.Pow(accuracyValue, 1.1f), 1.0f / 1.1f
) * multiplier;
if (categoryRatings != null)
{
categoryRatings.Add("Aim", aimValue);
categoryRatings.Add("Speed", speedValue);
categoryRatings.Add("Accuracy", accuracyValue);
categoryRatings.Add("OD", realOverallDifficulty);
categoryRatings.Add("AR", realApproachRate);
categoryRatings.Add("Max Combo", beatmapMaxCombo);
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}
return totalValue;
}
private double computeAimValue()
{
double aimValue = Math.Pow(5.0f * Math.Max(1.0f, Attributes["Aim"] / 0.0675f) - 4.0f, 3.0f) / 100000.0f;
// Longer maps are worth more
double lengthBonus = 0.95f + 0.4f * Math.Min(1.0f, totalHits / 2000.0f) +
(totalHits > 2000 ? Math.Log10(totalHits / 2000.0f) * 0.5f : 0.0f);
aimValue *= lengthBonus;
// Penalize misses exponentially. This mainly fixes tag4 maps and the likes until a per-hitobject solution is available
aimValue *= Math.Pow(0.97f, countMiss);
// Combo scaling
if (beatmapMaxCombo > 0)
aimValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8f) / Math.Pow(beatmapMaxCombo, 0.8f), 1.0f);
double approachRateFactor = 1.0f;
if (realApproachRate > 10.33f)
approachRateFactor += 0.45f * (realApproachRate - 10.33f);
else if (realApproachRate < 8.0f)
{
// HD is worth more with lower ar!
if (mods.Any(h => h is OsuModHidden))
approachRateFactor += 0.02f * (8.0f - realApproachRate);
else
approachRateFactor += 0.01f * (8.0f - realApproachRate);
}
aimValue *= approachRateFactor;
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// We want to give more reward for lower AR when it comes to aim and HD. This nerfs high AR and buffs lower AR.
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if (mods.Any(h => h is OsuModHidden))
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aimValue *= 1.02 + (11.0f - realApproachRate) / 50.0; // Gives a 1.04 bonus for AR10, a 1.06 bonus for AR9, a 1.02 bonus for AR11.
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if (mods.Any(h => h is OsuModFlashlight))
{
// Apply length bonus again if flashlight is on simply because it becomes a lot harder on longer maps.
aimValue *= 1.45f * lengthBonus;
}
// Scale the aim value with accuracy _slightly_
aimValue *= 0.5f + accuracy / 2.0f;
// It is important to also consider accuracy difficulty when doing that
aimValue *= 0.98f + Math.Pow(realOverallDifficulty, 2) / 2500;
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return aimValue;
}
private double computeSpeedValue()
{
double speedValue = Math.Pow(5.0f * Math.Max(1.0f, Attributes["Speed"] / 0.0675f) - 4.0f, 3.0f) / 100000.0f;
// Longer maps are worth more
speedValue *= 0.95f + 0.4f * Math.Min(1.0f, totalHits / 2000.0f) +
(totalHits > 2000 ? Math.Log10(totalHits / 2000.0f) * 0.5f : 0.0f);
// Penalize misses exponentially. This mainly fixes tag4 maps and the likes until a per-hitobject solution is available
speedValue *= Math.Pow(0.97f, countMiss);
// Combo scaling
if (beatmapMaxCombo > 0)
speedValue *= Math.Min(Math.Pow(scoreMaxCombo, 0.8f) / Math.Pow(beatmapMaxCombo, 0.8f), 1.0f);
if (mods.Any(m => m is OsuModHidden))
speedValue *= 1.18f;
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// Scale the speed value with accuracy _slightly_
speedValue *= 0.5f + accuracy / 2.0f;
// It is important to also consider accuracy difficulty when doing that
speedValue *= 0.98f + Math.Pow(realOverallDifficulty, 2) / 2500;
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return speedValue;
}
private double computeAccuracyValue()
{
// This percentage only considers HitCircles of any value - in this part of the calculation we focus on hitting the timing hit window
double betterAccuracyPercentage;
int amountHitObjectsWithAccuracy = countHitCircles;
if (amountHitObjectsWithAccuracy > 0)
betterAccuracyPercentage = ((count300 - (totalHits - amountHitObjectsWithAccuracy)) * 6 + count100 * 2 + count50) / (amountHitObjectsWithAccuracy * 6);
else
betterAccuracyPercentage = 0;
// It is possible to reach a negative accuracy with this formula. Cap it at zero - zero points
if (betterAccuracyPercentage < 0)
betterAccuracyPercentage = 0;
// Lots of arbitrary values from testing.
// Considering to use derivation from perfect accuracy in a probabilistic manner - assume normal distribution
double accuracyValue = Math.Pow(1.52163f, realOverallDifficulty) * Math.Pow(betterAccuracyPercentage, 24) * 2.83f;
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// Bonus for many hitcircles - it's harder to keep good accuracy up for longer
accuracyValue *= Math.Min(1.15f, Math.Pow(amountHitObjectsWithAccuracy / 1000.0f, 0.3f));
if (mods.Any(m => m is OsuModHidden))
accuracyValue *= 1.02f;
if (mods.Any(m => m is OsuModFlashlight))
accuracyValue *= 1.02f;
return accuracyValue;
}
private double totalHits => count300 + count100 + count50 + countMiss;
private double totalSuccessfulHits => count300 + count100 + count50;
}
}