mirror of
https://github.com/ppy/osu
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83 lines
3.0 KiB
C#
83 lines
3.0 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.Preprocessing;
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using osu.Game.Rulesets.Osu.Objects;
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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 correctly aim at every object in the map with a uniform CircleSize and normalized distances.
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/// </summary>
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public class Aim : OsuStrainSkill
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{
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private const double angle_bonus_begin = Math.PI / 3;
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private const double timing_threshold = 107;
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public Aim(Mod[] mods)
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: base(mods)
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{
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}
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private double currentStrain = 1;
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private double skillMultiplier => 26.25;
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private double strainDecayBase => 0.15;
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private double aimStrainOf(DifficultyHitObject current)
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{
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if (current.BaseObject is Spinner)
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return 0;
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var osuCurrent = (OsuDifficultyHitObject)current;
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double aimStrain = 0;
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if (Previous.Count > 0)
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{
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var osuPrevious = (OsuDifficultyHitObject)Previous[0];
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if (osuCurrent.Angle != null && osuCurrent.Angle.Value > angle_bonus_begin)
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{
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const double scale = 90;
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var angleBonus = Math.Sqrt(
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Math.Max(osuPrevious.JumpDistance - scale, 0)
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* Math.Pow(Math.Sin(osuCurrent.Angle.Value - angle_bonus_begin), 2)
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* Math.Max(osuCurrent.JumpDistance - scale, 0));
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aimStrain = 1.4 * applyDiminishingExp(Math.Max(0, angleBonus)) / Math.Max(timing_threshold, osuPrevious.StrainTime);
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}
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}
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double jumpDistanceExp = applyDiminishingExp(osuCurrent.JumpDistance);
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double travelDistanceExp = applyDiminishingExp(osuCurrent.TravelDistance);
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return Math.Max(
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aimStrain + (jumpDistanceExp + travelDistanceExp + Math.Sqrt(travelDistanceExp * jumpDistanceExp)) / Math.Max(osuCurrent.StrainTime, timing_threshold),
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(Math.Sqrt(travelDistanceExp * jumpDistanceExp) + jumpDistanceExp + travelDistanceExp) / osuCurrent.StrainTime
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);
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}
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private double applyDiminishingExp(double val) => Math.Pow(val, 0.99);
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private double strainDecay(double ms) => Math.Pow(strainDecayBase, ms / 1000);
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protected override double CalculateInitialStrain(double time) => currentStrain * strainDecay(time - Previous[0].StartTime);
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protected override double StrainValueAt(DifficultyHitObject current)
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{
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double aimStrain = aimStrainOf(current);
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currentStrain *= strainDecay(current.DeltaTime);
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currentStrain += aimStrain * skillMultiplier;
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// Console.WriteLine(currentStrain);
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return currentStrain;
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}
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}
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}
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