mirror of https://github.com/ppy/osu
61 lines
2.0 KiB
C#
61 lines
2.0 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 osu.Game.Rulesets.Difficulty.Preprocessing;
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using osu.Game.Rulesets.Mods;
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using osu.Game.Rulesets.Osu.Difficulty.Evaluators;
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using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
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using System.Linq;
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namespace osu.Game.Rulesets.Osu.Difficulty.Skills
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{
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/// <summary>
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/// Represents the skill required to press keys with regards to keeping up with the speed at which objects need to be hit.
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/// </summary>
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public class Speed : OsuStrainSkill
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{
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private double skillMultiplier => 1.430;
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private double strainDecayBase => 0.3;
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private double currentStrain;
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private double currentRhythm;
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protected override int ReducedSectionCount => 5;
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public Speed(Mod[] mods)
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: base(mods)
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{
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}
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private double strainDecay(double ms) => Math.Pow(strainDecayBase, ms / 1000);
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protected override double CalculateInitialStrain(double time, DifficultyHitObject current) => (currentStrain * currentRhythm) * strainDecay(time - current.Previous(0).StartTime);
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protected override double StrainValueAt(DifficultyHitObject current)
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{
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currentStrain *= strainDecay(((OsuDifficultyHitObject)current).StrainTime);
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currentStrain += SpeedEvaluator.EvaluateDifficultyOf(current) * skillMultiplier;
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currentRhythm = RhythmEvaluator.EvaluateDifficultyOf(current);
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double totalStrain = currentStrain * currentRhythm;
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ObjectStrains.Add(totalStrain);
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return totalStrain;
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}
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public double RelevantNoteCount()
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{
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if (ObjectStrains.Count == 0)
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return 0;
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double maxStrain = ObjectStrains.Max();
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if (maxStrain == 0)
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return 0;
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return ObjectStrains.Sum(strain => 1.0 / (1.0 + Math.Exp(-(strain / maxStrain * 12.0 - 6.0))));
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}
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}
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}
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