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osu-lazer/osu.Game.Rulesets.Osu/Difficulty/Skills/Aim.cs
2021-10-17 04:48:57 +00:00

125 lines
5.7 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 correctly aim at every object in the map with a uniform CircleSize and normalized distances.
/// </summary>
public class Aim : OsuStrainSkill
{
public Aim(Mod[] mods)
: base(mods)
{
}
protected override int HistoryLength => 2;
private const double wide_angle_multiplier = 1.5;
private const double acute_angle_multiplier = 1.5;
private const double slider_multiplier = 2.75;
private double currentStrain = 1;
private double skillMultiplier => 23.25;
private double strainDecayBase => 0.15;
private double strainValueOf(DifficultyHitObject current)
{
if (current.BaseObject is Spinner || Previous.Count <= 1)
return 0;
var osuCurrObj = (OsuDifficultyHitObject)current;
var osuPrevObj = (OsuDifficultyHitObject)Previous[0];
var osuLastObj = (OsuDifficultyHitObject)Previous[1];
double currVelocity = osuCurrObj.JumpDistance / osuCurrObj.StrainTime; // Start iwth the base distance / time
if (osuPrevObj.BaseObject is Slider) // If object is a slider
{
double movementVelocity = osuCurrObj.MovementDistance / osuCurrObj.MovementTime; // calculate the movement velocity from slider end to next note
double travelVelocity = osuCurrObj.TravelDistance / osuCurrObj.TravelTime; // calculate the slider velocity from slider head to lazy end.
currVelocity = Math.Max(currVelocity, movementVelocity + travelVelocity); // take the larger total combined velocity.
}
double prevVelocity = osuPrevObj.JumpDistance / osuPrevObj.StrainTime; // do the same for the previous velocity.
if (osuLastObj.BaseObject is Slider)
{
double movementVelocity = osuPrevObj.MovementDistance / osuPrevObj.MovementTime;
double travelVelocity = osuPrevObj.TravelDistance / osuPrevObj.TravelTime;
prevVelocity = Math.Max(prevVelocity, movementVelocity + travelVelocity);
}
double angleBonus = 0;
double sliderBonus = 0;
double aimStrain = currVelocity; // Start strain with regular velocity.
if (Precision.AlmostEquals(osuCurrObj.StrainTime, osuPrevObj.StrainTime, 10)) // If rhythms are the same.
{
if (osuCurrObj.Angle != null && osuPrevObj.Angle != null)
{
double currAngle = osuCurrObj.Angle.Value;
double prevAngle = osuPrevObj.Angle.Value;
// Rewarding angles, take the smaller velocity as base.
angleBonus = Math.Min(currVelocity, prevVelocity);
double wideAngleBonus = calcWideAngleBonus(currAngle);
double acuteAngleBonus = calcAcuteAngleBonus(currAngle);
if (osuCurrObj.StrainTime > 100) // Only buff deltaTime exceeding 300 bpm 1/2.
acuteAngleBonus = 0;
else
acuteAngleBonus *= calcAcuteAngleBonus(prevAngle) // Multiply by previous angle, we don't want to buff unless this is a wiggle type pattern.
* Math.Min(angleBonus, 125 / osuCurrObj.StrainTime) // The maximum velocity we buff is equal to 125 / strainTime
* Math.Pow(Math.Sin(Math.PI / 2 * Math.Min(1, (100 - osuCurrObj.StrainTime) / 25)), 2) // scale buff from 150 bpm 1/4 to 200 bpm 1/4
* Math.Pow(Math.Sin(Math.PI / 2 * (Math.Min(100, osuCurrObj.JumpDistance) - 50) / 50), 2); // Buff distance exceeding 50 (radius) up to 100 (diameter).
wideAngleBonus *= angleBonus * (1 - Math.Pow(calcWideAngleBonus(prevAngle), 3)); // Penalize wide angles if they're repeated, reducing the penalty as the prevAngle gets more acute.
angleBonus = acuteAngleBonus * acute_angle_multiplier + wideAngleBonus * wide_angle_multiplier; // add the anglebuffs together.
}
}
if (osuCurrObj.TravelDistance != 0)
{
sliderBonus = osuCurrObj.TravelDistance / osuCurrObj.TravelTime; // add some slider rewards
}
aimStrain += angleBonus; // Add in angle bonus.
aimStrain += sliderBonus * slider_multiplier; // Add in additional slider velocity.
return aimStrain;
}
private double calcWideAngleBonus(double angle) => Math.Pow(Math.Sin(3.0 / 4 * (Math.Min(5.0 / 6 * Math.PI, Math.Max(Math.PI / 6, angle)) - Math.PI / 6)), 2);
private double calcAcuteAngleBonus(double angle) => 1 - calcWideAngleBonus(angle);
private double applyDiminishingExp(double val) => Math.Pow(val, 0.99);
private double strainDecay(double ms) => Math.Pow(strainDecayBase, ms / 1000);
protected override double CalculateInitialStrain(double time) => currentStrain * strainDecay(time - Previous[0].StartTime);
protected override double StrainValueAt(DifficultyHitObject current)
{
currentStrain *= strainDecay(current.DeltaTime);
currentStrain += strainValueOf(current) * skillMultiplier;
return currentStrain;
}
}
}