osu/osu.Game/Beatmaps/ControlPoints/ControlPointInfo.cs

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// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.Collections.Generic;
using System.Linq;
using Newtonsoft.Json;
using osu.Framework.Lists;
namespace osu.Game.Beatmaps.ControlPoints
{
[Serializable]
public class ControlPointInfo
{
/// <summary>
/// All timing points.
/// </summary>
[JsonProperty]
public SortedList<TimingControlPoint> TimingPoints { get; private set; } = new SortedList<TimingControlPoint>(Comparer<TimingControlPoint>.Default);
/// <summary>
/// All difficulty points.
/// </summary>
[JsonProperty]
public SortedList<DifficultyControlPoint> DifficultyPoints { get; private set; } = new SortedList<DifficultyControlPoint>(Comparer<DifficultyControlPoint>.Default);
/// <summary>
/// All sound points.
/// </summary>
[JsonProperty]
public SortedList<SampleControlPoint> SamplePoints { get; private set; } = new SortedList<SampleControlPoint>(Comparer<SampleControlPoint>.Default);
/// <summary>
/// All effect points.
/// </summary>
[JsonProperty]
public SortedList<EffectControlPoint> EffectPoints { get; private set; } = 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) => binarySearch(DifficultyPoints, time);
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/// <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) => binarySearch(EffectPoints, time);
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/// <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 SampleControlPoint SamplePointAt(double time) => binarySearch(SamplePoints, time, SamplePoints.Count > 0 ? SamplePoints[0] : null);
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/// <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) => binarySearch(TimingPoints, time, TimingPoints.Count > 0 ? TimingPoints[0] : null);
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/// <summary>
/// Finds the maximum BPM represented by any timing control point.
/// </summary>
[JsonIgnore]
public double BPMMaximum =>
60000 / (TimingPoints.OrderBy(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
/// <summary>
/// Finds the minimum BPM represented by any timing control point.
/// </summary>
[JsonIgnore]
public double BPMMinimum =>
60000 / (TimingPoints.OrderByDescending(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
/// <summary>
/// Finds the mode BPM (most common BPM) represented by the control points.
/// </summary>
[JsonIgnore]
public double BPMMode =>
60000 / (TimingPoints.GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).FirstOrDefault()?.FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
/// <summary>
/// Binary searches one of the control point lists to find the active control point at <paramref name="time"/>.
/// </summary>
/// <param name="list">The list to search.</param>
/// <param name="time">The time to find the control point at.</param>
/// <param name="prePoint">The control point to use when <paramref name="time"/> is before any control points. If null, a new control point will be constructed.</param>
/// <returns>The active control point at <paramref name="time"/>.</returns>
private T binarySearch<T>(SortedList<T> list, double time, T prePoint = null)
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where T : ControlPoint, new()
{
if (list == null)
throw new ArgumentNullException(nameof(list));
if (list.Count == 0)
return new T();
if (time < list[0].Time)
return prePoint ?? new T();
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if (time >= list[list.Count - 1].Time)
return list[list.Count - 1];
int l = 0;
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int r = list.Count - 2;
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while (l <= r)
{
int pivot = l + ((r - l) >> 1);
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if (list[pivot].Time < time)
l = pivot + 1;
else if (list[pivot].Time > time)
r = pivot - 1;
else
return list[pivot];
}
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// l will be the first control point with Time > time, but we want the one before it
return list[l - 1];
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}
}
}