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121 lines
5.4 KiB
C#
121 lines
5.4 KiB
C#
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
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// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using Newtonsoft.Json;
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using osu.Framework.Lists;
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namespace osu.Game.Beatmaps.ControlPoints
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{
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[Serializable]
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public class ControlPointInfo
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{
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/// <summary>
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/// All timing points.
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/// </summary>
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[JsonProperty]
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public SortedList<TimingControlPoint> TimingPoints { get; private set; } = new SortedList<TimingControlPoint>(Comparer<TimingControlPoint>.Default);
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/// <summary>
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/// All difficulty points.
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/// </summary>
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[JsonProperty]
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public SortedList<DifficultyControlPoint> DifficultyPoints { get; private set; } = new SortedList<DifficultyControlPoint>(Comparer<DifficultyControlPoint>.Default);
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/// <summary>
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/// All sound points.
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/// </summary>
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[JsonProperty]
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public SortedList<SampleControlPoint> SamplePoints { get; private set; } = new SortedList<SampleControlPoint>(Comparer<SampleControlPoint>.Default);
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/// <summary>
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/// All effect points.
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/// </summary>
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[JsonProperty]
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public SortedList<EffectControlPoint> EffectPoints { get; private set; } = new SortedList<EffectControlPoint>(Comparer<EffectControlPoint>.Default);
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/// <summary>
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/// Finds the difficulty control point that is active at <paramref name="time"/>.
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/// </summary>
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/// <param name="time">The time to find the difficulty control point at.</param>
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/// <returns>The difficulty control point.</returns>
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public DifficultyControlPoint DifficultyPointAt(double time) => binarySearch(DifficultyPoints, time);
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/// <summary>
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/// Finds the effect control point that is active at <paramref name="time"/>.
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/// </summary>
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/// <param name="time">The time to find the effect control point at.</param>
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/// <returns>The effect control point.</returns>
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public EffectControlPoint EffectPointAt(double time) => binarySearch(EffectPoints, time);
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/// <summary>
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/// Finds the sound control point that is active at <paramref name="time"/>.
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/// </summary>
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/// <param name="time">The time to find the sound control point at.</param>
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/// <returns>The sound control point.</returns>
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public SampleControlPoint SamplePointAt(double time) => binarySearch(SamplePoints, time, SamplePoints.FirstOrDefault());
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/// <summary>
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/// Finds the timing control point that is active at <paramref name="time"/>.
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/// </summary>
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/// <param name="time">The time to find the timing control point at.</param>
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/// <returns>The timing control point.</returns>
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public TimingControlPoint TimingPointAt(double time) => binarySearch(TimingPoints, time, TimingPoints.FirstOrDefault());
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/// <summary>
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/// Finds the maximum BPM represented by any timing control point.
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/// </summary>
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[JsonIgnore]
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public double BPMMaximum =>
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60000 / (TimingPoints.OrderBy(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
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/// <summary>
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/// Finds the minimum BPM represented by any timing control point.
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/// </summary>
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[JsonIgnore]
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public double BPMMinimum =>
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60000 / (TimingPoints.OrderByDescending(c => c.BeatLength).FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
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/// <summary>
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/// Finds the mode BPM (most common BPM) represented by the control points.
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/// </summary>
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[JsonIgnore]
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public double BPMMode =>
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60000 / (TimingPoints.GroupBy(c => c.BeatLength).OrderByDescending(grp => grp.Count()).FirstOrDefault()?.FirstOrDefault() ?? new TimingControlPoint()).BeatLength;
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/// <summary>
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/// Binary searches one of the control point lists to find the active control point at <paramref name="time"/>.
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/// </summary>
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/// <param name="list">The list to search.</param>
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/// <param name="time">The time to find the control point at.</param>
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/// <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>
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/// <returns>The active control point at <paramref name="time"/>.</returns>
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private T binarySearch<T>(SortedList<T> list, double time, T prePoint = null)
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where T : ControlPoint, new()
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{
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if (list == null)
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throw new ArgumentNullException(nameof(list));
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if (list.Count == 0)
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return new T();
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if (time < list[0].Time)
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return prePoint ?? new T();
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int index = list.BinarySearch(new T { Time = time });
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// Check if we've found an exact match (t == time)
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if (index >= 0)
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return list[index];
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index = ~index;
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// BinarySearch will return the index of the first element _greater_ than the search
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// This is the inactive point - the active point is the one before it (index - 1)
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return list[index - 1];
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}
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}
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}
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