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85 lines
3.2 KiB
C#
85 lines
3.2 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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#nullable disable
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using JetBrains.Annotations;
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using osu.Framework.Utils;
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using osu.Game.Rulesets.Difficulty;
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namespace osu.Game.Beatmaps
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{
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public readonly struct StarDifficulty
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{
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/// <summary>
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/// The star difficulty rating for the given beatmap.
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/// </summary>
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public readonly double Stars;
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/// <summary>
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/// The maximum combo achievable on the given beatmap.
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/// </summary>
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public readonly int MaxCombo;
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/// <summary>
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/// The difficulty attributes computed for the given beatmap.
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/// Might not be available if the star difficulty is associated with a beatmap that's not locally available.
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/// </summary>
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[CanBeNull]
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public readonly DifficultyAttributes Attributes;
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/// <summary>
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/// Creates a <see cref="StarDifficulty"/> structure based on <see cref="DifficultyAttributes"/> computed
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/// by a <see cref="DifficultyCalculator"/>.
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/// </summary>
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public StarDifficulty([NotNull] DifficultyAttributes attributes)
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{
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Stars = double.IsFinite(attributes.StarRating) ? attributes.StarRating : 0;
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MaxCombo = attributes.MaxCombo;
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Attributes = attributes;
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// Todo: Add more members (BeatmapInfo.DifficultyRating? Attributes? Etc...)
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}
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/// <summary>
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/// Creates a <see cref="StarDifficulty"/> structure with a pre-populated star difficulty and max combo
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/// in scenarios where computing <see cref="DifficultyAttributes"/> is not feasible (i.e. when working with online sources).
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/// </summary>
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public StarDifficulty(double starDifficulty, int maxCombo)
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{
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Stars = double.IsFinite(starDifficulty) ? starDifficulty : 0;
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MaxCombo = maxCombo;
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Attributes = null;
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}
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public DifficultyRating DifficultyRating => GetDifficultyRating(Stars);
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/// <summary>
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/// Retrieves the <see cref="DifficultyRating"/> that describes a star rating.
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/// </summary>
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/// <remarks>
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/// For more information, see: https://osu.ppy.sh/help/wiki/Difficulties
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/// </remarks>
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/// <param name="starRating">The star rating.</param>
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/// <returns>The <see cref="DifficultyRating"/> that best describes <paramref name="starRating"/>.</returns>
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public static DifficultyRating GetDifficultyRating(double starRating)
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{
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if (Precision.AlmostBigger(starRating, 6.5, 0.005))
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return DifficultyRating.ExpertPlus;
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if (Precision.AlmostBigger(starRating, 5.3, 0.005))
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return DifficultyRating.Expert;
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if (Precision.AlmostBigger(starRating, 4.0, 0.005))
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return DifficultyRating.Insane;
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if (Precision.AlmostBigger(starRating, 2.7, 0.005))
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return DifficultyRating.Hard;
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if (Precision.AlmostBigger(starRating, 2.0, 0.005))
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return DifficultyRating.Normal;
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return DifficultyRating.Easy;
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}
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}
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}
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