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