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228 lines
8.1 KiB
C#
228 lines
8.1 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 System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq;
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using osu.Game.Beatmaps;
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using osu.Game.Rulesets.Objects;
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namespace osu.Game.Rulesets.Scoring
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{
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/// <summary>
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/// A structure containing timing data for hit window based gameplay.
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/// </summary>
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public class HitWindows
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{
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private static readonly DifficultyRange[] base_ranges =
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{
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new DifficultyRange(HitResult.Perfect, 22.4D, 19.4D, 13.9D),
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new DifficultyRange(HitResult.Great, 64, 49, 34),
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new DifficultyRange(HitResult.Good, 97, 82, 67),
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new DifficultyRange(HitResult.Ok, 127, 112, 97),
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new DifficultyRange(HitResult.Meh, 151, 136, 121),
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new DifficultyRange(HitResult.Miss, 188, 173, 158),
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};
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private double perfect;
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private double great;
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private double good;
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private double ok;
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private double meh;
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private double miss;
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/// <summary>
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/// An empty <see cref="HitWindows"/> with only <see cref="HitResult.Miss"/> and <see cref="HitResult.Perfect"/>.
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/// No time values are provided (meaning instantaneous hit or miss).
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/// </summary>
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public static HitWindows Empty => new EmptyHitWindows();
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public HitWindows()
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{
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Debug.Assert(GetRanges().Any(r => r.Result == HitResult.Miss), $"{nameof(GetRanges)} should always contain {nameof(HitResult.Miss)}");
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Debug.Assert(GetRanges().Any(r => r.Result != HitResult.Miss), $"{nameof(GetRanges)} should always contain at least one result type other than {nameof(HitResult.Miss)}.");
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}
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/// <summary>
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/// Retrieves the <see cref="HitResult"/> with the largest hit window that produces a successful hit.
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/// </summary>
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/// <returns>The lowest allowed successful <see cref="HitResult"/>.</returns>
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protected HitResult LowestSuccessfulHitResult()
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{
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for (var result = HitResult.Meh; result <= HitResult.Perfect; ++result)
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{
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if (IsHitResultAllowed(result))
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return result;
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}
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return HitResult.None;
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}
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/// <summary>
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/// Retrieves a mapping of <see cref="HitResult"/>s to their timing windows for all allowed <see cref="HitResult"/>s.
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/// </summary>
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/// <returns></returns>
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public IEnumerable<(HitResult result, double length)> GetAllAvailableWindows()
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{
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for (var result = HitResult.Meh; result <= HitResult.Perfect; ++result)
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{
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if (IsHitResultAllowed(result))
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yield return (result, WindowFor(result));
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}
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}
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/// <summary>
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/// Check whether it is possible to achieve the provided <see cref="HitResult"/>.
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/// </summary>
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/// <param name="result">The result type to check.</param>
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/// <returns>Whether the <see cref="HitResult"/> can be achieved.</returns>
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public virtual bool IsHitResultAllowed(HitResult result) => true;
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/// <summary>
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/// Sets hit windows with values that correspond to a difficulty parameter.
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/// </summary>
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/// <param name="difficulty">The parameter.</param>
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public void SetDifficulty(double difficulty)
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{
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foreach (var range in GetRanges())
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{
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var value = BeatmapDifficulty.DifficultyRange(difficulty, (range.Min, range.Average, range.Max));
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switch (range.Result)
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{
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case HitResult.Miss:
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miss = value;
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break;
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case HitResult.Meh:
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meh = value;
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break;
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case HitResult.Ok:
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ok = value;
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break;
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case HitResult.Good:
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good = value;
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break;
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case HitResult.Great:
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great = value;
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break;
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case HitResult.Perfect:
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perfect = value;
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break;
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}
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}
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}
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/// <summary>
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/// Retrieves the <see cref="HitResult"/> for a time offset.
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/// </summary>
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/// <param name="timeOffset">The time offset.</param>
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/// <returns>The hit result, or <see cref="HitResult.None"/> if <paramref name="timeOffset"/> doesn't result in a judgement.</returns>
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public HitResult ResultFor(double timeOffset)
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{
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timeOffset = Math.Abs(timeOffset);
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for (var result = HitResult.Perfect; result >= HitResult.Miss; --result)
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{
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if (IsHitResultAllowed(result) && timeOffset <= WindowFor(result))
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return result;
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}
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return HitResult.None;
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}
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/// <summary>
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/// Retrieves the hit window for a <see cref="HitResult"/>.
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/// This is the number of +/- milliseconds allowed for the requested result (so the actual hittable range is double this).
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/// </summary>
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/// <param name="result">The expected <see cref="HitResult"/>.</param>
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/// <returns>One half of the hit window for <paramref name="result"/>.</returns>
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public double WindowFor(HitResult result)
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{
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switch (result)
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{
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case HitResult.Perfect:
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return perfect;
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case HitResult.Great:
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return great;
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case HitResult.Good:
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return good;
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case HitResult.Ok:
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return ok;
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case HitResult.Meh:
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return meh;
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case HitResult.Miss:
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return miss;
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default:
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throw new ArgumentException("Unknown enum member", nameof(result));
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}
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}
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/// <summary>
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/// Given a time offset, whether the <see cref="HitObject"/> can ever be hit in the future with a non-<see cref="HitResult.Miss"/> result.
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/// This happens if <paramref name="timeOffset"/> is less than what is required for <see cref="LowestSuccessfulHitResult"/>.
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/// </summary>
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/// <param name="timeOffset">The time offset.</param>
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/// <returns>Whether the <see cref="HitObject"/> can be hit at any point in the future from this time offset.</returns>
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public bool CanBeHit(double timeOffset) => timeOffset <= WindowFor(LowestSuccessfulHitResult());
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/// <summary>
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/// Retrieve a valid list of <see cref="DifficultyRange"/>s representing hit windows.
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/// Defaults are provided but can be overridden to customise for a ruleset.
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/// </summary>
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protected virtual DifficultyRange[] GetRanges() => base_ranges;
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public class EmptyHitWindows : HitWindows
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{
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private static readonly DifficultyRange[] ranges =
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{
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new DifficultyRange(HitResult.Perfect, 0, 0, 0),
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new DifficultyRange(HitResult.Miss, 0, 0, 0),
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};
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public override bool IsHitResultAllowed(HitResult result)
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{
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switch (result)
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{
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case HitResult.Perfect:
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case HitResult.Miss:
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return true;
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}
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return false;
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}
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protected override DifficultyRange[] GetRanges() => ranges;
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}
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}
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public struct DifficultyRange
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{
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public readonly HitResult Result;
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public double Min;
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public double Average;
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public double Max;
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public DifficultyRange(HitResult result, double min, double average, double max)
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{
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Result = result;
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Min = min;
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Average = average;
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Max = max;
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}
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}
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}
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