osu/osu.Game/Configuration/SessionAverageHitErrorTracker.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.Linq;
using osu.Framework.Allocation;
using osu.Framework.Bindables;
using osu.Framework.Graphics;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Scoring;
using osu.Game.Scoring;
namespace osu.Game.Configuration
{
/// <summary>
/// Tracks the local user's average hit error during the ongoing play session.
/// </summary>
[Cached]
public partial class SessionAverageHitErrorTracker : Component
{
public IBindableList<DataPoint> AverageHitErrorHistory => averageHitErrorHistory;
private readonly BindableList<DataPoint> averageHitErrorHistory = new BindableList<DataPoint>();
private readonly Bindable<ScoreInfo?> latestScore = new Bindable<ScoreInfo?>();
[Resolved]
private OsuConfigManager configManager { get; set; } = null!;
[BackgroundDependencyLoader]
private void load(SessionStatics statics)
{
statics.BindWith(Static.LastLocalUserScore, latestScore);
latestScore.BindValueChanged(score => calculateAverageHitError(score.NewValue), true);
}
private void calculateAverageHitError(ScoreInfo? newScore)
{
if (newScore == null)
return;
if (newScore.Mods.Any(m => !m.UserPlayable || m is IHasNoTimedInputs))
return;
if (newScore.HitEvents.Count < 10)
return;
if (newScore.HitEvents.CalculateAverageHitError() is not double averageError)
return;
// keep a sane maximum number of entries.
if (averageHitErrorHistory.Count >= 50)
averageHitErrorHistory.RemoveAt(0);
double globalOffset = configManager.Get<double>(OsuSetting.AudioOffset);
averageHitErrorHistory.Add(new DataPoint(averageError, globalOffset));
}
public void ClearHistory() => averageHitErrorHistory.Clear();
public readonly struct DataPoint
{
public double AverageHitError { get; }
public double GlobalAudioOffset { get; }
public double SuggestedGlobalAudioOffset => GlobalAudioOffset - AverageHitError;
public DataPoint(double averageHitError, double globalOffset)
{
AverageHitError = averageHitError;
GlobalAudioOffset = globalOffset;
}
}
}
}