osu/osu.Game/Beatmaps/Beatmap.cs

89 lines
3.6 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 osu.Game.Beatmaps.Timing;
using osu.Game.Rulesets.Objects;
using System.Collections.Generic;
using System.Linq;
using osu.Game.Beatmaps.ControlPoints;
using Newtonsoft.Json;
using osu.Game.IO.Serialization.Converters;
namespace osu.Game.Beatmaps
{
/// <summary>
/// A Beatmap containing converted HitObjects.
/// </summary>
public class Beatmap<T> : IBeatmap<T>
where T : HitObject
{
public BeatmapInfo BeatmapInfo { get; set; } = new BeatmapInfo
{
Metadata = new BeatmapMetadata
{
Artist = @"Unknown",
Title = @"Unknown",
AuthorString = @"Unknown Creator",
},
Version = @"Normal",
BaseDifficulty = new BeatmapDifficulty()
};
[JsonIgnore]
public BeatmapMetadata Metadata => BeatmapInfo?.Metadata ?? BeatmapInfo?.BeatmapSet?.Metadata;
public ControlPointInfo ControlPointInfo { get; set; } = new ControlPointInfo();
public List<BreakPeriod> Breaks { get; set; } = new List<BreakPeriod>();
[JsonIgnore]
public double TotalBreakTime => Breaks.Sum(b => b.Duration);
[JsonConverter(typeof(TypedListConverter<HitObject>))]
public List<T> HitObjects { get; set; } = new List<T>();
IReadOnlyList<T> IBeatmap<T>.HitObjects => HitObjects;
IReadOnlyList<HitObject> IBeatmap.HitObjects => HitObjects;
public virtual IEnumerable<BeatmapStatistic> GetStatistics() => Enumerable.Empty<BeatmapStatistic>();
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 =
// 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);
var nextTime = i == ControlPointInfo.TimingPoints.Count - 1 ? lastTime : ControlPointInfo.TimingPoints[i + 1].Time;
return (beatLength: t.BeatLength, duration: nextTime - t.Time);
})
// Aggregate durations into a set of (beatLength, duration) tuples for each beat length
.GroupBy(t => Math.Round(t.beatLength * 1000) / 1000)
.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();
return mostCommon.beatLength;
}
IBeatmap IBeatmap.Clone() => Clone();
public Beatmap<T> Clone() => (Beatmap<T>)MemberwiseClone();
}
public class Beatmap : Beatmap<HitObject>
{
public new Beatmap Clone() => (Beatmap)base.Clone();
public override string ToString() => BeatmapInfo?.ToString() ?? base.ToString();
}
}