mirror of https://github.com/ppy/osu
83 lines
3.2 KiB
C#
83 lines
3.2 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.Rulesets.Difficulty;
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using osu.Game.Rulesets.Mods;
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using osu.Game.Rulesets.Scoring;
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using osu.Game.Scoring;
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namespace osu.Game.Rulesets.Mania.Difficulty
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{
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public class ManiaPerformanceCalculator : PerformanceCalculator
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{
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private int countPerfect;
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private int countGreat;
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private int countGood;
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private int countOk;
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private int countMeh;
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private int countMiss;
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private double scoreAccuracy;
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public ManiaPerformanceCalculator()
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: base(new ManiaRuleset())
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{
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}
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protected override PerformanceAttributes CreatePerformanceAttributes(ScoreInfo score, DifficultyAttributes attributes)
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{
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var maniaAttributes = (ManiaDifficultyAttributes)attributes;
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countPerfect = score.Statistics.GetValueOrDefault(HitResult.Perfect);
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countGreat = score.Statistics.GetValueOrDefault(HitResult.Great);
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countGood = score.Statistics.GetValueOrDefault(HitResult.Good);
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countOk = score.Statistics.GetValueOrDefault(HitResult.Ok);
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countMeh = score.Statistics.GetValueOrDefault(HitResult.Meh);
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countMiss = score.Statistics.GetValueOrDefault(HitResult.Miss);
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scoreAccuracy = calculateCustomAccuracy();
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// Arbitrary initial value for scaling pp in order to standardize distributions across game modes.
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// The specific number has no intrinsic meaning and can be adjusted as needed.
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double multiplier = 8.0;
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if (score.Mods.Any(m => m is ModNoFail))
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multiplier *= 0.75;
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if (score.Mods.Any(m => m is ModEasy))
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multiplier *= 0.5;
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double difficultyValue = computeDifficultyValue(maniaAttributes);
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double totalValue = difficultyValue * multiplier;
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return new ManiaPerformanceAttributes
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{
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Difficulty = difficultyValue,
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Total = totalValue
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};
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}
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private double computeDifficultyValue(ManiaDifficultyAttributes attributes)
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{
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double difficultyValue = Math.Pow(Math.Max(attributes.StarRating - 0.15, 0.05), 2.2) // Star rating to pp curve
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* Math.Max(0, 5 * scoreAccuracy - 4) // From 80% accuracy, 1/20th of total pp is awarded per additional 1% accuracy
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* (1 + 0.1 * Math.Min(1, totalHits / 1500)); // Length bonus, capped at 1500 notes
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return difficultyValue;
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}
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private double totalHits => countPerfect + countOk + countGreat + countGood + countMeh + countMiss;
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/// <summary>
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/// Accuracy used to weight judgements independently from the score's actual accuracy.
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/// </summary>
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private double calculateCustomAccuracy()
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{
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if (totalHits == 0)
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return 0;
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return (countPerfect * 320 + countGreat * 300 + countGood * 200 + countOk * 100 + countMeh * 50) / (totalHits * 320);
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}
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}
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}
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