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osu-lazer/osu.Game.Rulesets.Osu/Difficulty/Skills/Speed.cs
2021-09-16 14:20:42 +09:00

89 lines
3.7 KiB
C#

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.
using System;
using osu.Game.Rulesets.Difficulty.Preprocessing;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
using osu.Game.Rulesets.Osu.Objects;
using osu.Framework.Utils;
namespace osu.Game.Rulesets.Osu.Difficulty.Skills
{
/// <summary>
/// Represents the skill required to press keys with regards to keeping up with the speed at which objects need to be hit.
/// </summary>
public class Speed : OsuStrainSkill
{
private const double single_spacing_threshold = 125;
private const double angle_bonus_begin = 5 * Math.PI / 6;
private const double pi_over_4 = Math.PI / 4;
private const double pi_over_2 = Math.PI / 2;
protected override double SkillMultiplier => 1400;
protected override double StrainDecayBase => 0.3;
protected override int ReducedSectionCount => 5;
protected override double DifficultyMultiplier => 1.04;
private const double min_speed_bonus = 75; // ~200BPM
private const double speed_balancing_factor = 40;
private readonly double greatWindow;
public Speed(Mod[] mods, double hitWindowGreat)
: base(mods)
{
greatWindow = hitWindowGreat;
}
protected override double StrainValueOf(DifficultyHitObject current)
{
if (current.BaseObject is Spinner)
return 0;
var osuCurrent = (OsuDifficultyHitObject)current;
var osuPrevious = Previous.Count > 0 ? (OsuDifficultyHitObject)Previous[0] : null;
double distance = Math.Min(single_spacing_threshold, osuCurrent.TravelDistance + osuCurrent.JumpDistance);
double strainTime = osuCurrent.StrainTime;
double greatWindowFull = greatWindow * 2;
double speedWindowRatio = strainTime / greatWindowFull;
// Aim to nerf cheesy rhythms (Very fast consecutive doubles with large deltatimes between)
if (osuPrevious != null && strainTime < greatWindowFull && osuPrevious.StrainTime > strainTime)
strainTime = Interpolation.Lerp(osuPrevious.StrainTime, strainTime, speedWindowRatio);
// Cap deltatime to the OD 300 hitwindow.
// 0.93 is derived from making sure 260bpm OD8 streams aren't nerfed harshly, whilst 0.92 limits the effect of the cap.
strainTime /= Math.Clamp((strainTime / greatWindowFull) / 0.93, 0.92, 1);
double speedBonus = 1.0;
if (strainTime < min_speed_bonus)
speedBonus = 1 + Math.Pow((min_speed_bonus - strainTime) / speed_balancing_factor, 2);
double angleBonus = 1.0;
if (osuCurrent.Angle != null && osuCurrent.Angle.Value < angle_bonus_begin)
{
angleBonus = 1 + Math.Pow(Math.Sin(1.5 * (angle_bonus_begin - osuCurrent.Angle.Value)), 2) / 3.57;
if (osuCurrent.Angle.Value < pi_over_2)
{
angleBonus = 1.28;
if (distance < 90 && osuCurrent.Angle.Value < pi_over_4)
angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1);
else if (distance < 90)
angleBonus += (1 - angleBonus) * Math.Min((90 - distance) / 10, 1) * Math.Sin((pi_over_2 - osuCurrent.Angle.Value) / pi_over_4);
}
}
return (1 + (speedBonus - 1) * 0.75)
* angleBonus
* (0.95 + speedBonus * Math.Pow(distance / single_spacing_threshold, 3.5))
/ strainTime;
}
}
}