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osu-lazer/osu.Game.Rulesets.Osu/Difficulty/Preprocessing/OsuDifficultyBeatmap.cs

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// 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.Collections;
using System.Collections.Generic;
using osu.Game.Rulesets.Osu.Objects;
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namespace osu.Game.Rulesets.Osu.Difficulty.Preprocessing
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{
/// <summary>
/// An enumerable container wrapping <see cref="OsuHitObject"/> input as <see cref="OsuDifficultyHitObject"/>
/// which contains extra data required for difficulty calculation.
/// </summary>
public class OsuDifficultyBeatmap : IEnumerable<OsuDifficultyHitObject>
{
private readonly IEnumerator<OsuDifficultyHitObject> difficultyObjects;
/// <summary>
/// Creates an enumerator, which preprocesses a list of <see cref="OsuHitObject"/>s recieved as input, wrapping them as
/// <see cref="OsuDifficultyHitObject"/> which contains extra data required for difficulty calculation.
/// </summary>
public OsuDifficultyBeatmap(List<OsuHitObject> objects, double timeRate)
{
// Sort OsuHitObjects by StartTime - they are not correctly ordered in some cases.
// This should probably happen before the objects reach the difficulty calculator.
objects.Sort((a, b) => a.StartTime.CompareTo(b.StartTime));
difficultyObjects = createDifficultyObjectEnumerator(objects, timeRate);
}
/// <summary>
/// Returns an enumerator that enumerates all <see cref="OsuDifficultyHitObject"/>s in the <see cref="OsuDifficultyBeatmap"/>.
/// </summary>
public IEnumerator<OsuDifficultyHitObject> GetEnumerator() => difficultyObjects;
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();
private IEnumerator<OsuDifficultyHitObject> createDifficultyObjectEnumerator(List<OsuHitObject> objects, double timeRate)
{
// The first jump is formed by the first two hitobjects of the map.
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// If the map has less than two OsuHitObjects, the enumerator will not return anything.
for (int i = 1; i < objects.Count; i++)
yield return new OsuDifficultyHitObject(objects[i], objects[i - 1], timeRate);
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}
}
}