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osu-lazer/osu.Game/Beatmaps/DifficultyCalculator.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
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using osu.Game.Rulesets.Objects;
using System.Collections.Generic;
using osu.Game.Rulesets.Mods;
using osu.Framework.Timing;
using System.Linq;
using osu.Framework.Extensions.IEnumerableExtensions;
namespace osu.Game.Beatmaps
{
public abstract class DifficultyCalculator
{
protected double TimeRate = 1;
public abstract double Calculate(Dictionary<string, double> categoryDifficulty = null);
}
public abstract class DifficultyCalculator<T> : DifficultyCalculator where T : HitObject
{
protected readonly Beatmap<T> Beatmap;
protected readonly Mod[] Mods;
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protected DifficultyCalculator(Beatmap beatmap, Mod[] mods = null)
{
Mods = mods ?? new Mod[0];
var converter = CreateBeatmapConverter(beatmap);
foreach (var mod in Mods.OfType<IApplicableToBeatmapConverter<T>>())
mod.ApplyToBeatmapConverter(converter);
Beatmap = converter.Convert(beatmap);
ApplyMods(Mods);
PreprocessHitObjects();
}
protected virtual void ApplyMods(Mod[] mods)
{
var clock = new StopwatchClock();
mods.OfType<IApplicableToClock>().ForEach(m => m.ApplyToClock(clock));
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TimeRate = clock.Rate;
foreach (var mod in Mods.OfType<IApplicableToDifficulty>())
mod.ApplyToDifficulty(Beatmap.BeatmapInfo.BaseDifficulty);
foreach (var h in Beatmap.HitObjects)
h.ApplyDefaults(Beatmap.ControlPointInfo, Beatmap.BeatmapInfo.BaseDifficulty);
foreach (var mod in mods.OfType<IApplicableToHitObject<T>>())
foreach (var obj in Beatmap.HitObjects)
mod.ApplyToHitObject(obj);
}
protected virtual void PreprocessHitObjects()
{
}
protected abstract BeatmapConverter<T> CreateBeatmapConverter(Beatmap beatmap);
}
}