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Use SortedList + BinarySearch to find control points at time values.

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smoogipooo
2017-05-23 15:20:32 +09:00
parent 6bfd7e0fb0
commit 002a0e99a2
6 changed files with 54 additions and 26 deletions
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49
osu.Game/Beatmaps/ControlPoints/ControlPointInfo.cs
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@ -1,63 +1,82 @@
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Lists;
namespace osu.Game.Beatmaps.ControlPoints
{
public class ControlPointInfo
{
/// <summary>
/// All the control points.
/// </summary>
public readonly List<ControlPoint> ControlPoints = new List<ControlPoint>();
public readonly SortedList<TimingControlPoint> TimingPoints = new SortedList<TimingControlPoint>(Comparer<TimingControlPoint>.Default);
public readonly SortedList<DifficultyControlPoint> DifficultyPoints = new SortedList<DifficultyControlPoint>(Comparer<DifficultyControlPoint>.Default);
public readonly SortedList<SoundControlPoint> SoundPoints = new SortedList<SoundControlPoint>(Comparer<SoundControlPoint>.Default);
public readonly SortedList<EffectControlPoint> EffectPoints = new SortedList<EffectControlPoint>(Comparer<EffectControlPoint>.Default);
/// <summary>
/// Finds the difficulty control point that is active at <paramref name="time"/>.
/// </summary>
/// <param name="time">The time to find the difficulty control point at.</param>
/// <returns>The difficulty control point.</returns>
public DifficultyControlPoint DifficultyPointAt(double time) =>
ControlPoints.OfType<DifficultyControlPoint>().LastOrDefault(t => t.Time <= time) ?? new DifficultyControlPoint();
public DifficultyControlPoint DifficultyPointAt(double time) => binarySearch(DifficultyPoints, time);
/// <summary>
/// Finds the effect control point that is active at <paramref name="time"/>.
/// </summary>
/// <param name="time">The time to find the effect control point at.</param>
/// <returns>The effect control point.</returns>
public EffectControlPoint EffectPointAt(double time) =>
ControlPoints.OfType<EffectControlPoint>().LastOrDefault(t => t.Time <= time) ?? new EffectControlPoint();
public EffectControlPoint EffectPointAt(double time) => binarySearch(EffectPoints, time);
/// <summary>
/// Finds the sound control point that is active at <paramref name="time"/>.
/// </summary>
/// <param name="time">The time to find the sound control point at.</param>
/// <returns>The sound control point.</returns>
public SoundControlPoint SoundPointAt(double time) =>
ControlPoints.OfType<SoundControlPoint>().LastOrDefault(t => t.Time <= time) ?? new SoundControlPoint();
public SoundControlPoint SoundPointAt(double time) => binarySearch(SoundPoints, time);
/// <summary>
/// Finds the timing control point that is active at <paramref name="time"/>.
/// </summary>
/// <param name="time">The time to find the timing control point at.</param>
/// <returns>The timing control point.</returns>
public TimingControlPoint TimingPointAt(double time) =>
ControlPoints.OfType<TimingControlPoint>().LastOrDefault(t => t.Time <= time) ?? new TimingControlPoint();
public TimingControlPoint TimingPointAt(double time) => binarySearch(TimingPoints, time);
/// <summary>
/// Finds the maximum BPM represented by any timing control point.
/// </summary>
public double BPMMaximum =>
60000 / (ControlPoints.OfType<TimingControlPoint>().OrderBy(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
60000 / (TimingPoints.OrderBy(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
/// <summary>
/// Finds the minimum BPM represented by any timing control point.
/// </summary>
public double BPMMinimum =>
60000 / (ControlPoints.OfType<TimingControlPoint>().OrderByDescending(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
60000 / (TimingPoints.OrderByDescending(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
/// <summary>
/// Finds the mode BPM (most common BPM) represented by the control points.
/// </summary>
public double BPMMode =>
60000 / (ControlPoints.OfType<TimingControlPoint>().GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).FirstOrDefault()?.FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
60000 / (TimingPoints.GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).FirstOrDefault()?.FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
private T binarySearch<T>(SortedList<T> list, double time)
where T : ControlPoint, new()
{
if (list.Count == 0)
return new T();
if (time < list[0].Time)
return new T();
int index = list.BinarySearch(new T() { Time = time });
// Check if we've found an exact match (t == time)
if (index >= 0)
return list[index];
index = ~index;
if (index == list.Count)
return list[list.Count - 1];
return list[index - 1];
}
}
}