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osu-lazer/osu.Game/Rulesets/Objects/HitWindows.cs

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2018-04-13 17:19:50 +08:00
// Copyright (c) 2007-2018 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE
using System;
using System.Collections.Generic;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Scoring;
namespace osu.Game.Rulesets.Objects
{
public class HitWindows
{
private static readonly IReadOnlyDictionary<HitResult, (double od0, double od5, double od10)> base_ranges = new Dictionary<HitResult, (double, double, double)>
{
{ HitResult.Perfect, (44.8, 38.8, 27.8) },
{ HitResult.Great, (128, 98, 68 ) },
{ HitResult.Good, (194, 164, 134) },
{ HitResult.Ok, (254, 224, 194) },
{ HitResult.Meh, (302, 272, 242) },
{ HitResult.Miss, (376, 346, 316) },
};
/// <summary>
/// Hit window for a <see cref="HitResult.Perfect"/> result.
/// The user can only achieve receive this result if <see cref="AllowsPerfect"/> is true.
/// </summary>
public double Perfect { get; protected set; }
/// <summary>
/// Hit window for a <see cref="HitResult.Great"/> result.
/// </summary>
public double Great { get; protected set; }
/// <summary>
/// Hit window for a <see cref="HitResult.Good"/> result.
/// </summary>
public double Good { get; protected set; }
/// <summary>
/// Hit window for an <see cref="HitResult.Ok"/> result.
/// The user can only achieve this result if <see cref="AllowsOk"/> is true.
/// </summary>
public double Ok { get; protected set; }
/// <summary>
/// Hit window for a <see cref="HitResult.Meh"/> result.
/// </summary>
public double Meh { get; protected set; }
/// <summary>
/// Hit window for a <see cref="HitResult.Miss"/> result.
/// </summary>
public double Miss { get; protected set; }
/// <summary>
/// Whether it's possible to achieve a <see cref="HitResult.Perfect"/> result.
/// </summary>
public bool AllowsPerfect;
/// <summary>
/// Whether it's possible to achieve a <see cref="HitResult.Ok"/> result.
/// </summary>
public bool AllowsOk;
/// <summary>
/// Sets hit windows with values that correspond to a difficulty parameter.
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/// </summary>
/// <param name="difficulty">The parameter.</param>
public virtual void SetDifficulty(double difficulty)
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{
Perfect = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Perfect]);
Great = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Great]);
Good = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Good]);
Ok = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Ok]);
Meh = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Meh]);
Miss = BeatmapDifficulty.DifficultyRange(difficulty, base_ranges[HitResult.Miss]);
}
/// <summary>
/// Retrieves the <see cref="HitResult"/> for a time offset.
/// </summary>
/// <param name="timeOffset">The time offset.</param>
/// <returns>The hit result, or <see cref="HitResult.None"/> if <paramref name="timeOffset"/> doesn't result in a judgement.</returns>
public HitResult ResultFor(double timeOffset)
{
timeOffset = Math.Abs(timeOffset);
if (AllowsPerfect && timeOffset <= HalfWindowFor(HitResult.Perfect))
return HitResult.Perfect;
if (timeOffset <= HalfWindowFor(HitResult.Great))
return HitResult.Great;
if (timeOffset <= HalfWindowFor(HitResult.Good))
return HitResult.Good;
if (AllowsOk && timeOffset <= HalfWindowFor(HitResult.Ok))
return HitResult.Ok;
if (timeOffset <= HalfWindowFor(HitResult.Meh))
return HitResult.Meh;
if (timeOffset <= HalfWindowFor(HitResult.Miss))
return HitResult.Miss;
return HitResult.None;
}
/// <summary>
/// Retrieves half the hit window for a <see cref="HitResult"/>.
/// This is useful if the hit window for one half of the hittable range of a <see cref="HitObject"/> is required.
/// </summary>
/// <param name="result">The expected <see cref="HitResult"/>.</param>
/// <returns>One half of the hit window for <paramref name="result"/>.</returns>
public double HalfWindowFor(HitResult result)
{
switch (result)
{
case HitResult.Perfect:
return Perfect / 2;
case HitResult.Great:
return Great / 2;
case HitResult.Good:
return Good / 2;
case HitResult.Ok:
return Ok / 2;
case HitResult.Meh:
return Meh / 2;
case HitResult.Miss:
return Miss / 2;
default:
throw new ArgumentException(nameof(result));
}
}
/// <summary>
/// Given a time offset, whether the <see cref="HitObject"/> can ever be hit in the future with a non-<see cref="HitResult.Miss"/> result.
/// This happens if <paramref name="timeOffset"/> is less than what is required for a <see cref="Meh"/> result.
/// </summary>
/// <param name="timeOffset">The time offset.</param>
/// <returns>Whether the <see cref="HitObject"/> can be hit at any point in the future from this time offset.</returns>
public bool CanBeHit(double timeOffset) => timeOffset <= HalfWindowFor(HitResult.Meh);
}
}