mirror of https://github.com/ppy/osu
95 lines
4.3 KiB
C#
95 lines
4.3 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.Linq;
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using osu.Game.Rulesets.Difficulty.Preprocessing;
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using osu.Game.Rulesets.Objects;
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using osu.Game.Rulesets.Taiko.Objects;
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namespace osu.Game.Rulesets.Taiko.Difficulty.Preprocessing
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{
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/// <summary>
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/// Represents a single hit object in taiko difficulty calculation.
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/// </summary>
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public class TaikoDifficultyHitObject : DifficultyHitObject
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{
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/// <summary>
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/// The rhythm required to hit this hit object.
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/// </summary>
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public readonly TaikoDifficultyHitObjectRhythm Rhythm;
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/// <summary>
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/// The hit type of this hit object.
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/// </summary>
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public readonly HitType? HitType;
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/// <summary>
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/// The index of the object in the beatmap.
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/// </summary>
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public readonly int ObjectIndex;
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/// <summary>
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/// Whether the object should carry a penalty due to being hittable using special techniques
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/// making it easier to do so.
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/// </summary>
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public bool StaminaCheese;
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/// <summary>
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/// Creates a new difficulty hit object.
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/// </summary>
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/// <param name="hitObject">The gameplay <see cref="HitObject"/> associated with this difficulty object.</param>
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/// <param name="lastObject">The gameplay <see cref="HitObject"/> preceding <paramref name="hitObject"/>.</param>
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/// <param name="lastLastObject">The gameplay <see cref="HitObject"/> preceding <paramref name="lastObject"/>.</param>
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/// <param name="clockRate">The rate of the gameplay clock. Modified by speed-changing mods.</param>
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/// <param name="objectIndex">The index of the object in the beatmap.</param>
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public TaikoDifficultyHitObject(HitObject hitObject, HitObject lastObject, HitObject lastLastObject, double clockRate, int objectIndex)
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: base(hitObject, lastObject, clockRate)
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{
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var currentHit = hitObject as Hit;
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Rhythm = getClosestRhythm(lastObject, lastLastObject, clockRate);
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HitType = currentHit?.Type;
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ObjectIndex = objectIndex;
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}
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/// <summary>
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/// List of most common rhythm changes in taiko maps.
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/// </summary>
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/// <remarks>
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/// The general guidelines for the values are:
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/// <list type="bullet">
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/// <item>rhythm changes with ratio closer to 1 (that are <i>not</i> 1) are harder to play,</item>
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/// <item>speeding up is <i>generally</i> harder than slowing down (with exceptions of rhythm changes requiring a hand switch).</item>
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/// </list>
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/// </remarks>
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private static readonly TaikoDifficultyHitObjectRhythm[] common_rhythms =
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{
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new TaikoDifficultyHitObjectRhythm(1, 1, 0.0),
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new TaikoDifficultyHitObjectRhythm(2, 1, 0.3),
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new TaikoDifficultyHitObjectRhythm(1, 2, 0.5),
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new TaikoDifficultyHitObjectRhythm(3, 1, 0.3),
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new TaikoDifficultyHitObjectRhythm(1, 3, 0.35),
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new TaikoDifficultyHitObjectRhythm(3, 2, 0.6), // purposefully higher (requires hand switch in full alternating gameplay style)
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new TaikoDifficultyHitObjectRhythm(2, 3, 0.4),
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new TaikoDifficultyHitObjectRhythm(5, 4, 0.5),
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new TaikoDifficultyHitObjectRhythm(4, 5, 0.7)
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};
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/// <summary>
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/// Returns the closest rhythm change from <see cref="common_rhythms"/> required to hit this object.
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/// </summary>
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/// <param name="lastObject">The gameplay <see cref="HitObject"/> preceding this one.</param>
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/// <param name="lastLastObject">The gameplay <see cref="HitObject"/> preceding <paramref name="lastObject"/>.</param>
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/// <param name="clockRate">The rate of the gameplay clock.</param>
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private TaikoDifficultyHitObjectRhythm getClosestRhythm(HitObject lastObject, HitObject lastLastObject, double clockRate)
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{
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double prevLength = (lastObject.StartTime - lastLastObject.StartTime) / clockRate;
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double ratio = DeltaTime / prevLength;
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return common_rhythms.OrderBy(x => Math.Abs(x.Ratio - ratio)).First();
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}
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}
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}
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