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osu-lazer/osu.Game/Rulesets/Difficulty/Preprocessing/DifficultyHitObject.cs
2022-06-17 16:37:17 +09:00

73 lines
3.1 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
#nullable disable
using System.Collections.Generic;
using System.Linq;
using osu.Game.Rulesets.Objects;
namespace osu.Game.Rulesets.Difficulty.Preprocessing
{
/// <summary>
/// Wraps a <see cref="HitObject"/> and provides additional information to be used for difficulty calculation.
/// </summary>
public class DifficultyHitObject
{
private readonly IReadOnlyList<DifficultyHitObject> difficultyHitObjects;
/// <summary>
/// The index of this <see cref="DifficultyHitObject"/> in the list of all <see cref="DifficultyHitObject"/>s.
/// </summary>
public int Index;
/// <summary>
/// The <see cref="HitObject"/> this <see cref="DifficultyHitObject"/> wraps.
/// </summary>
public readonly HitObject BaseObject;
/// <summary>
/// The last <see cref="HitObject"/> which occurs before <see cref="BaseObject"/>.
/// </summary>
public readonly HitObject LastObject;
/// <summary>
/// Amount of time elapsed between <see cref="BaseObject"/> and <see cref="LastObject"/>, adjusted by clockrate.
/// </summary>
public readonly double DeltaTime;
/// <summary>
/// Clockrate adjusted start time of <see cref="BaseObject"/>.
/// </summary>
public readonly double StartTime;
/// <summary>
/// Clockrate adjusted end time of <see cref="BaseObject"/>.
/// </summary>
public readonly double EndTime;
/// <summary>
/// Creates a new <see cref="DifficultyHitObject"/>.
/// </summary>
/// <param name="hitObject">The <see cref="HitObject"/> which this <see cref="DifficultyHitObject"/> wraps.</param>
/// <param name="lastObject">The last <see cref="HitObject"/> which occurs before <paramref name="hitObject"/> in the beatmap.</param>
/// <param name="clockRate">The rate at which the gameplay clock is run at.</param>
/// <param name="objects">The list of <see cref="DifficultyHitObject"/>s in the current beatmap.</param>
/// <param name="index">The index of this <see cref="DifficultyHitObject"/> in <paramref name="objects"/> list.</param>
public DifficultyHitObject(HitObject hitObject, HitObject lastObject, double clockRate, List<DifficultyHitObject> objects, int index)
{
difficultyHitObjects = objects;
Index = index;
BaseObject = hitObject;
LastObject = lastObject;
DeltaTime = (hitObject.StartTime - lastObject.StartTime) / clockRate;
StartTime = hitObject.StartTime / clockRate;
EndTime = hitObject.GetEndTime() / clockRate;
}
public DifficultyHitObject Previous(int backwardsIndex) => difficultyHitObjects.ElementAtOrDefault(Index - (backwardsIndex + 1));
public DifficultyHitObject Next(int forwardsIndex) => difficultyHitObjects.ElementAtOrDefault(Index + (forwardsIndex + 1));
}
}