mirror of
https://github.com/ppy/osu
synced 2024-12-25 16:22:23 +00:00
190 lines
7.8 KiB
C#
190 lines
7.8 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 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 const double single_spacing_threshold = 125;
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private const double angle_bonus_begin = 5 * Math.PI / 6;
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private const double pi_over_4 = Math.PI / 4;
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private const double pi_over_2 = Math.PI / 2;
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private const double rhythmMultiplier = 1.5;
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private double skillMultiplier => 1400;
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private double strainDecayBase => 0.3;
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private double difficultyMultiplier => 1.04;
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private double currentTapStrain = 1;
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private double currentMovementStrain = 1;
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protected override int ReducedSectionCount => 5;
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private const double min_speed_bonus = 75; // ~200BPM
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private const double max_speed_bonus = 45; // ~330BPM
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private const double speed_balancing_factor = 40;
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protected override int HistoryLength => 32;
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private const int HistoryTimeMax = 3000; // 4 seconds of calculatingRhythmBonus max.
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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 bool isRatioEqual(double ratio, double a, double b)
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{
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return a + 15 > ratio * b && a - 15 < ratio * b;
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}
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/// <summary>
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/// Calculates a rhythm multiplier for the difficulty of the tap associated with historic data of the current <see cref="OsuDifficultyHitObject"/>.
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/// </summary>
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private double calculateRhythmBonus(double startTime)
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{
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// {doubles, triplets, quads, quints, 6-tuplets, 7 Tuplets, greater}
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int previousIslandSize = -1;
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double[] islandTimes = {0, 0, 0, 0, 0, 0, 0};
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int islandSize = 0;
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bool firstDeltaSwitch = false;
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for (int i = Previous.Count - 1; i > 0; i--)
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{
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double currDelta = ((OsuDifficultyHitObject)Previous[i - 1]).StrainTime;
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double prevDelta = ((OsuDifficultyHitObject)Previous[i]).StrainTime;
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double effectiveRatio = Math.Min(prevDelta, currDelta) / Math.Max(prevDelta, currDelta);
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effectiveRatio *= Math.Sqrt(100 / ((currDelta + prevDelta) / 2)); // scale with bpm.
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if (effectiveRatio > 0.5)
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effectiveRatio = 0.5 + (effectiveRatio - 0.5) * 5; // extra buff for 1/3 -> 1/4 etc transitions.
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double currHistoricalDecay = Math.Max(0, (HistoryTimeMax - (startTime - Previous[i - 1].StartTime))) / HistoryTimeMax;
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if (firstDeltaSwitch)
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{
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if (isRatioEqual(1.0, prevDelta, currDelta))
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{
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islandSize++; // island is still progressing, count size.
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}
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else
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{
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if (islandSize > 6)
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islandSize = 6;
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if (Previous[i - 1].BaseObject is Slider) // bpm change is into slider, this is easy acc window
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effectiveRatio *= 0.5;
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if (Previous[i].BaseObject is Slider) // bpm change was from a slider, this is easier typically than circle -> circle
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effectiveRatio *= 0.75;
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if (previousIslandSize == islandSize) // repeated island size (ex: triplet -> triplet)
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effectiveRatio *= 0.5;
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islandTimes[islandSize] = islandTimes[islandSize] + effectiveRatio * currHistoricalDecay;
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previousIslandSize = islandSize; // log the last island size.
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if (prevDelta * 1.25 < currDelta) // we're slowing down, stop counting
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firstDeltaSwitch = false; // if we're speeding up, this stays true and we keep counting island size.
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islandSize = 0;
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}
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}
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else if (prevDelta > 1.25 * currDelta) // we want to be speeding up.
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{
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// Begin counting island until we change speed again.
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firstDeltaSwitch = true;
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islandSize = 0;
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}
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}
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double rhythmComplexitySum = 0.0;
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for (int i = 0; i < islandTimes.Length; i++)
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{
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rhythmComplexitySum += islandTimes[i]; // sum the total amount of rhythm variance
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}
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// Console.WriteLine(Math.Sqrt(4 + rhythmComplexitySum * rhythmMultiplier) / 2);
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return Math.Sqrt(4 + rhythmComplexitySum * rhythmMultiplier) / 2;
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}
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private void setStrainValues(DifficultyHitObject current)
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{
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// if (current.BaseObject is Spinner)
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// {
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// currentTapStrain *= strainDecay(current.DeltaTime);
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//
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// currentMovementStrain *= strainDecay(current.DeltaTime);
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//
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// return;
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// }
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var osuCurrent = (OsuDifficultyHitObject)current;
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double distance = Math.Min(single_spacing_threshold, osuCurrent.TravelDistance + osuCurrent.JumpDistance);
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double deltaTime = Math.Max(max_speed_bonus, current.DeltaTime);
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double speedBonus = 1.0;
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if (deltaTime < min_speed_bonus)
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speedBonus = 1 + Math.Pow((min_speed_bonus - deltaTime) / speed_balancing_factor, 2);
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double angleBonus = 1.0;
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if (osuCurrent.Angle != null && osuCurrent.Angle.Value < angle_bonus_begin)
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{
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angleBonus = 1 + Math.Pow(Math.Sin(1.5 * (angle_bonus_begin - osuCurrent.Angle.Value)), 2) / 3.57;
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if (osuCurrent.Angle.Value < pi_over_2)
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{
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angleBonus = 1.28;
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if (distance < 90 && osuCurrent.Angle.Value < pi_over_4)
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angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1);
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else if (distance < 90)
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angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1) * Math.Sin((pi_over_2 - osuCurrent.Angle.Value) / pi_over_4);
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}
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}
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// return (1 + (speedBonus - 1) * 0.75) * angleBonus * (0.95 + speedBonus * Math.Pow(distance / single_spacing_threshold, 3.5)) / osuCurrent.StrainTime;
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double tapStrain = ((1 + (speedBonus - 1) * 0.75) * 0.95) / osuCurrent.StrainTime;
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double movementStrain = ((1 + (speedBonus - 1) * 0.75) * angleBonus * speedBonus * Math.Pow(distance / single_spacing_threshold, 3.5)) / osuCurrent.StrainTime;
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currentTapStrain *= strainDecay(current.DeltaTime);
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currentTapStrain += tapStrain * skillMultiplier;
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currentMovementStrain *= strainDecay(current.DeltaTime);
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currentMovementStrain += movementStrain * skillMultiplier;
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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) => (currentMovementStrain + currentTapStrain) * strainDecay(time - Previous[0].StartTime);
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protected override double StrainValueAt(DifficultyHitObject current)
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{
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setStrainValues(current);
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// Console.WriteLine(currentMovementStrain + currentTapStrain);
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return currentMovementStrain + currentTapStrain * calculateRhythmBonus(current.StartTime);
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}
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}
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}
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