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osu-lazer/osu.Game/Beatmaps/Beatmap.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.
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#nullable disable
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using System;
using osu.Game.Beatmaps.Timing;
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using osu.Game.Rulesets.Objects;
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using System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps.ControlPoints;
using Newtonsoft.Json;
using osu.Game.IO.Serialization.Converters;
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namespace osu.Game.Beatmaps
{
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/// <summary>
/// A Beatmap containing converted HitObjects.
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/// </summary>
public class Beatmap<T> : IBeatmap<T>
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where T : HitObject
{
private BeatmapDifficulty difficulty = new BeatmapDifficulty();
public BeatmapDifficulty Difficulty
{
get => difficulty;
set
{
difficulty = value;
if (beatmapInfo != null)
beatmapInfo.Difficulty = difficulty.Clone();
}
}
private BeatmapInfo beatmapInfo;
public BeatmapInfo BeatmapInfo
{
get => beatmapInfo;
set
{
beatmapInfo = value;
if (beatmapInfo?.Difficulty != null)
Difficulty = beatmapInfo.Difficulty.Clone();
}
}
public Beatmap()
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{
beatmapInfo = new BeatmapInfo
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{
Metadata = new BeatmapMetadata
{
Artist = @"Unknown",
Title = @"Unknown",
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Author = { Username = @"Unknown Creator" },
},
DifficultyName = @"Normal",
Difficulty = Difficulty,
};
}
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[JsonIgnore]
public BeatmapMetadata Metadata => BeatmapInfo.Metadata;
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public ControlPointInfo ControlPointInfo { get; set; } = new ControlPointInfo();
public List<BreakPeriod> Breaks { get; set; } = new List<BreakPeriod>();
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[JsonIgnore]
public double TotalBreakTime => Breaks.Sum(b => b.Duration);
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[JsonConverter(typeof(TypedListConverter<HitObject>))]
public List<T> HitObjects { get; set; } = new List<T>();
IReadOnlyList<T> IBeatmap<T>.HitObjects => HitObjects;
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IReadOnlyList<HitObject> IBeatmap.HitObjects => HitObjects;
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public virtual IEnumerable<BeatmapStatistic> GetStatistics() => Enumerable.Empty<BeatmapStatistic>();
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public double GetMostCommonBeatLength()
{
// The last playable time in the beatmap - the last timing point extends to this time.
// Note: This is more accurate and may present different results because osu-stable didn't have the ability to calculate slider durations in this context.
double lastTime = HitObjects.LastOrDefault()?.GetEndTime() ?? ControlPointInfo.TimingPoints.LastOrDefault()?.Time ?? 0;
var mostCommon =
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// Construct a set of (beatLength, duration) tuples for each individual timing point.
ControlPointInfo.TimingPoints.Select((t, i) =>
{
if (t.Time > lastTime)
return (beatLength: t.BeatLength, 0);
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// osu-stable forced the first control point to start at 0.
// This is reproduced here to maintain compatibility around osu!mania scroll speed and song select display.
double currentTime = i == 0 ? 0 : t.Time;
double nextTime = i == ControlPointInfo.TimingPoints.Count - 1 ? lastTime : ControlPointInfo.TimingPoints[i + 1].Time;
return (beatLength: t.BeatLength, duration: nextTime - currentTime);
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})
// Aggregate durations into a set of (beatLength, duration) tuples for each beat length
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.GroupBy(t => Math.Round(t.beatLength * 1000) / 1000)
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.Select(g => (beatLength: g.Key, duration: g.Sum(t => t.duration)))
// Get the most common one, or 0 as a suitable default
.OrderByDescending(i => i.duration).FirstOrDefault();
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return mostCommon.beatLength;
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}
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IBeatmap IBeatmap.Clone() => Clone();
public Beatmap<T> Clone() => (Beatmap<T>)MemberwiseClone();
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}
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public class Beatmap : Beatmap<HitObject>
{
public new Beatmap Clone() => (Beatmap)base.Clone();
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public override string ToString() => BeatmapInfo?.ToString() ?? base.ToString();
}
}