osu/osu.Game.Rulesets.Taiko/Difficulty/TaikoPerformanceCalculator.cs

120 lines
4.7 KiB
C#

// 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.Rulesets.Difficulty;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Scoring;
using osu.Game.Rulesets.Taiko.Objects;
using osu.Game.Scoring;
namespace osu.Game.Rulesets.Taiko.Difficulty
{
public class TaikoPerformanceCalculator : PerformanceCalculator
{
private int countGreat;
private int countOk;
private int countMeh;
private int countMiss;
private double accuracy;
private double effectiveMissCount;
public TaikoPerformanceCalculator()
: base(new TaikoRuleset())
{
}
protected override PerformanceAttributes CreatePerformanceAttributes(ScoreInfo score, DifficultyAttributes attributes)
{
var taikoAttributes = (TaikoDifficultyAttributes)attributes;
countGreat = score.Statistics.GetValueOrDefault(HitResult.Great);
countOk = score.Statistics.GetValueOrDefault(HitResult.Ok);
countMeh = score.Statistics.GetValueOrDefault(HitResult.Meh);
countMiss = score.Statistics.GetValueOrDefault(HitResult.Miss);
accuracy = customAccuracy;
// The effectiveMissCount is calculated by gaining a ratio for totalSuccessfulHits and increasing the miss penalty for shorter object counts lower than 1000.
if (totalSuccessfulHits > 0)
effectiveMissCount = Math.Max(1.0, 1000.0 / totalSuccessfulHits) * countMiss;
// TODO: The detection of rulesets is temporary until the leftover old skills have been reworked.
bool isConvert = score.BeatmapInfo!.Ruleset.OnlineID != 1;
double multiplier = 1.13;
if (score.Mods.Any(m => m is ModHidden))
multiplier *= 1.075;
if (score.Mods.Any(m => m is ModEasy))
multiplier *= 0.975;
double difficultyValue = computeDifficultyValue(score, taikoAttributes, isConvert);
double accuracyValue = computeAccuracyValue(score, taikoAttributes, isConvert);
double totalValue =
Math.Pow(
Math.Pow(difficultyValue, 1.1) +
Math.Pow(accuracyValue, 1.1), 1.0 / 1.1
) * multiplier;
return new TaikoPerformanceAttributes
{
Difficulty = difficultyValue,
Accuracy = accuracyValue,
EffectiveMissCount = effectiveMissCount,
Total = totalValue
};
}
private double computeDifficultyValue(ScoreInfo score, TaikoDifficultyAttributes attributes, bool isConvert)
{
double difficultyValue = Math.Pow(5 * Math.Max(1.0, attributes.StarRating / 0.115) - 4.0, 2.25) / 1150.0;
double lengthBonus = 1 + 0.1 * Math.Min(1.0, totalHits / 1500.0);
difficultyValue *= lengthBonus;
difficultyValue *= Math.Pow(0.986, effectiveMissCount);
if (score.Mods.Any(m => m is ModEasy))
difficultyValue *= 0.985;
if (score.Mods.Any(m => m is ModHidden) && !isConvert)
difficultyValue *= 1.025;
if (score.Mods.Any(m => m is ModHardRock))
difficultyValue *= 1.050;
if (score.Mods.Any(m => m is ModFlashlight<TaikoHitObject>))
difficultyValue *= 1.050 * lengthBonus;
return difficultyValue * Math.Pow(accuracy, 2.0);
}
private double computeAccuracyValue(ScoreInfo score, TaikoDifficultyAttributes attributes, bool isConvert)
{
if (attributes.GreatHitWindow <= 0)
return 0;
double accuracyValue = Math.Pow(60.0 / attributes.GreatHitWindow, 1.1) * Math.Pow(accuracy, 8.0) * Math.Pow(attributes.StarRating, 0.4) * 27.0;
double lengthBonus = Math.Min(1.15, Math.Pow(totalHits / 1500.0, 0.3));
accuracyValue *= lengthBonus;
// Slight HDFL Bonus for accuracy. A clamp is used to prevent against negative values.
if (score.Mods.Any(m => m is ModFlashlight<TaikoHitObject>) && score.Mods.Any(m => m is ModHidden) && !isConvert)
accuracyValue *= Math.Max(1.0, 1.1 * lengthBonus);
return accuracyValue;
}
private int totalHits => countGreat + countOk + countMeh + countMiss;
private int totalSuccessfulHits => countGreat + countOk + countMeh;
private double customAccuracy => totalHits > 0 ? (countGreat * 300 + countOk * 150) / (totalHits * 300.0) : 0;
}
}