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osu-lazer/osu.Game.Rulesets.Catch/Difficulty/CatchPerformanceCalculator.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.Mods;
using osu.Game.Rulesets.Scoring;
using osu.Game.Scoring;
using osu.Game.Scoring.Legacy;
using osuTK;
namespace osu.Game.Rulesets.Catch.Difficulty
{
public class CatchPerformanceCalculator : PerformanceCalculator
{
protected new CatchDifficultyAttributes Attributes => (CatchDifficultyAttributes)base.Attributes;
private Mod[] mods;
private int fruitsHit;
private int ticksHit;
private int tinyTicksHit;
private int tinyTicksMissed;
private int misses;
public CatchPerformanceCalculator(Ruleset ruleset, WorkingBeatmap beatmap, ScoreInfo score)
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: base(ruleset, beatmap, score)
{
}
public override double Calculate(Dictionary<string, double> categoryDifficulty = null)
{
mods = Score.Mods;
var legacyScore = Score as LegacyScoreInfo;
fruitsHit = legacyScore?.Count300 ?? Score.Statistics[HitResult.Perfect];
ticksHit = legacyScore?.Count100 ?? 0;
tinyTicksHit = legacyScore?.Count50 ?? 0;
tinyTicksMissed = legacyScore?.CountKatu ?? 0;
misses = Score.Statistics[HitResult.Miss];
// Don't count scores made with supposedly unranked mods
if (mods.Any(m => !m.Ranked))
return 0;
// We are heavily relying on aim in catch the beat
double value = Math.Pow(5.0f * Math.Max(1.0f, Attributes.StarRating / 0.0049f) - 4.0f, 2.0f) / 100000.0f;
// Longer maps are worth more. "Longer" means how many hits there are which can contribute to combo
int numTotalHits = totalComboHits();
// Longer maps are worth more
float lengthBonus =
0.95f + 0.4f * Math.Min(1.0f, numTotalHits / 3000.0f) +
(numTotalHits > 3000 ? (float)Math.Log10(numTotalHits / 3000.0f) * 0.5f : 0.0f);
// Longer maps are worth more
value *= lengthBonus;
// Penalize misses exponentially. This mainly fixes tag4 maps and the likes until a per-hitobject solution is available
value *= Math.Pow(0.97f, misses);
// Combo scaling
float beatmapMaxCombo = Attributes.MaxCombo;
if (beatmapMaxCombo > 0)
value *= Math.Min(Math.Pow(Attributes.MaxCombo, 0.8f) / Math.Pow(beatmapMaxCombo, 0.8f), 1.0f);
float approachRate = (float)Attributes.ApproachRate;
float approachRateFactor = 1.0f;
if (approachRate > 9.0f)
approachRateFactor += 0.1f * (approachRate - 9.0f); // 10% for each AR above 9
else if (approachRate < 8.0f)
approachRateFactor += 0.025f * (8.0f - approachRate); // 2.5% for each AR below 8
value *= approachRateFactor;
if (mods.Any(m => m is ModHidden))
// Hiddens gives nothing on max approach rate, and more the lower it is
value *= 1.05f + 0.075f * (10.0f - Math.Min(10.0f, approachRate)); // 7.5% for each AR below 10
if (mods.Any(m => m is ModFlashlight))
// Apply length bonus again if flashlight is on simply because it becomes a lot harder on longer maps.
value *= 1.35f * lengthBonus;
// Scale the aim value with accuracy _slightly_
value *= Math.Pow(accuracy(), 5.5f);
// Custom multipliers for NoFail. SpunOut is not applicable.
if (mods.Any(m => m is ModNoFail))
value *= 0.90f;
return value;
}
private float accuracy() => totalHits() == 0 ? 0 : MathHelper.Clamp((float)totalSuccessfulHits() / totalHits(), 0f, 1f);
private int totalHits() => tinyTicksHit + ticksHit + fruitsHit + misses + tinyTicksMissed;
private int totalSuccessfulHits() => tinyTicksHit + ticksHit + fruitsHit;
private int totalComboHits() => misses + ticksHit + fruitsHit;
}
}