osu/osu.Game/Beatmaps/BeatmapDifficulty.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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using osu.Game.Database;
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namespace osu.Game.Beatmaps
{
public class BeatmapDifficulty : IHasPrimaryKey
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{
/// <summary>
/// The default value used for all difficulty settings except <see cref="SliderMultiplier"/> and <see cref="SliderTickRate"/>.
/// </summary>
public const float DEFAULT_DIFFICULTY = 5;
public int ID { get; set; }
public float DrainRate { get; set; } = DEFAULT_DIFFICULTY;
public float CircleSize { get; set; } = DEFAULT_DIFFICULTY;
public float OverallDifficulty { get; set; } = DEFAULT_DIFFICULTY;
private float? approachRate;
public float ApproachRate
{
get => approachRate ?? OverallDifficulty;
set => approachRate = value;
}
public double SliderMultiplier { get; set; } = 1;
public double SliderTickRate { get; set; } = 1;
/// <summary>
/// Returns a shallow-clone of this <see cref="BeatmapDifficulty"/>.
/// </summary>
public BeatmapDifficulty Clone() => (BeatmapDifficulty)MemberwiseClone();
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/// <summary>
/// Maps a difficulty value [0, 10] to a two-piece linear range of values.
/// </summary>
/// <param name="difficulty">The difficulty value to be mapped.</param>
/// <param name="min">Minimum of the resulting range which will be achieved by a difficulty value of 0.</param>
/// <param name="mid">Midpoint of the resulting range which will be achieved by a difficulty value of 5.</param>
/// <param name="max">Maximum of the resulting range which will be achieved by a difficulty value of 10.</param>
/// <returns>Value to which the difficulty value maps in the specified range.</returns>
public static double DifficultyRange(double difficulty, double min, double mid, double max)
{
if (difficulty > 5)
return mid + (max - mid) * (difficulty - 5) / 5;
if (difficulty < 5)
return mid - (mid - min) * (5 - difficulty) / 5;
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return mid;
}
/// <summary>
/// Maps a difficulty value [0, 10] to a two-piece linear range of values.
/// </summary>
/// <param name="difficulty">The difficulty value to be mapped.</param>
/// <param name="range">The values that define the two linear ranges.
/// <list type="table">
/// <item>
/// <term>od0</term>
/// <description>Minimum of the resulting range which will be achieved by a difficulty value of 0.</description>
/// </item>
/// <item>
/// <term>od5</term>
/// <description>Midpoint of the resulting range which will be achieved by a difficulty value of 5.</description>
/// </item>
/// <item>
/// <term>od10</term>
/// <description>Maximum of the resulting range which will be achieved by a difficulty value of 10.</description>
/// </item>
/// </list>
/// </param>
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/// <returns>Value to which the difficulty value maps in the specified range.</returns>
public static double DifficultyRange(double difficulty, (double od0, double od5, double od10) range)
=> DifficultyRange(difficulty, range.od0, range.od5, range.od10);
}
}