mirror of https://github.com/ppy/osu
57 lines
2.2 KiB
C#
57 lines
2.2 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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#nullable disable
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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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namespace osu.Game.Rulesets.Difficulty.Skills
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{
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/// <summary>
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/// Used to processes strain values of <see cref="DifficultyHitObject"/>s, keep track of strain levels caused by the processed objects
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/// and to calculate a final difficulty value representing the difficulty of hitting all the processed objects.
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/// </summary>
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public abstract class StrainDecaySkill : StrainSkill
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{
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/// <summary>
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/// Strain values are multiplied by this number for the given skill. Used to balance the value of different skills between each other.
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/// </summary>
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protected abstract double SkillMultiplier { get; }
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/// <summary>
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/// Determines how quickly strain decays for the given skill.
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/// For example a value of 0.15 indicates that strain decays to 15% of its original value in one second.
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/// </summary>
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protected abstract double StrainDecayBase { get; }
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/// <summary>
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/// The current strain level.
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/// </summary>
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protected double CurrentStrain { get; private set; }
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protected StrainDecaySkill(Mod[] mods)
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: base(mods)
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{
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}
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protected override double CalculateInitialStrain(double time, DifficultyHitObject current) => CurrentStrain * 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(current.DeltaTime);
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CurrentStrain += StrainValueOf(current) * SkillMultiplier;
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return CurrentStrain;
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}
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/// <summary>
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/// Calculates the strain value of a <see cref="DifficultyHitObject"/>. This value is affected by previously processed objects.
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/// </summary>
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protected abstract double StrainValueOf(DifficultyHitObject current);
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private double strainDecay(double ms) => Math.Pow(StrainDecayBase, ms / 1000);
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}
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}
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