mirror of
https://github.com/ppy/osu.git
synced 2025-01-31 14:25:10 +08:00
76ac11ff59
* Fix angle bonuses calculating repetition incorrectly, apply distance scaling to wide bonus * Buff speed to compensate for streams losing pp * Adjust speed multiplier * Adjust wide scaling * Fix tests
74 lines
3.4 KiB
C#
74 lines
3.4 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 System.Collections.Generic;
|
|
using System.Linq;
|
|
using osu.Game.Rulesets.Difficulty.Preprocessing;
|
|
using osu.Game.Rulesets.Difficulty.Utils;
|
|
using osu.Game.Rulesets.Mods;
|
|
using osu.Game.Rulesets.Osu.Difficulty.Preprocessing;
|
|
using osu.Game.Rulesets.Osu.Mods;
|
|
using osu.Game.Rulesets.Osu.Objects;
|
|
|
|
namespace osu.Game.Rulesets.Osu.Difficulty.Evaluators
|
|
{
|
|
public static class SpeedEvaluator
|
|
{
|
|
private const double single_spacing_threshold = OsuDifficultyHitObject.NORMALISED_DIAMETER * 1.25; // 1.25 circles distance between centers
|
|
private const double min_speed_bonus = 200; // 200 BPM 1/4th
|
|
private const double speed_balancing_factor = 40;
|
|
private const double distance_multiplier = 0.9;
|
|
|
|
/// <summary>
|
|
/// Evaluates the difficulty of tapping the current object, based on:
|
|
/// <list type="bullet">
|
|
/// <item><description>time between pressing the previous and current object,</description></item>
|
|
/// <item><description>distance between those objects,</description></item>
|
|
/// <item><description>and how easily they can be cheesed.</description></item>
|
|
/// </list>
|
|
/// </summary>
|
|
public static double EvaluateDifficultyOf(DifficultyHitObject current, IReadOnlyList<Mod> mods)
|
|
{
|
|
if (current.BaseObject is Spinner)
|
|
return 0;
|
|
|
|
// derive strainTime for calculation
|
|
var osuCurrObj = (OsuDifficultyHitObject)current;
|
|
var osuPrevObj = current.Index > 0 ? (OsuDifficultyHitObject)current.Previous(0) : null;
|
|
|
|
double strainTime = osuCurrObj.StrainTime;
|
|
double doubletapness = 1.0 - osuCurrObj.GetDoubletapness((OsuDifficultyHitObject?)osuCurrObj.Next(0));
|
|
|
|
// 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 / osuCurrObj.HitWindowGreat) / 0.93, 0.92, 1);
|
|
|
|
// speedBonus will be 0.0 for BPM < 200
|
|
double speedBonus = 0.0;
|
|
|
|
// Add additional scaling bonus for streams/bursts higher than 200bpm
|
|
if (DifficultyCalculationUtils.MillisecondsToBPM(strainTime) > min_speed_bonus)
|
|
speedBonus = 0.75 * Math.Pow((DifficultyCalculationUtils.BPMToMilliseconds(min_speed_bonus) - strainTime) / speed_balancing_factor, 2);
|
|
|
|
double travelDistance = osuPrevObj?.TravelDistance ?? 0;
|
|
double distance = travelDistance + osuCurrObj.MinimumJumpDistance;
|
|
|
|
// Cap distance at single_spacing_threshold
|
|
distance = Math.Min(distance, single_spacing_threshold);
|
|
|
|
// Max distance bonus is 1 * `distance_multiplier` at single_spacing_threshold
|
|
double distanceBonus = Math.Pow(distance / single_spacing_threshold, 3.95) * distance_multiplier;
|
|
|
|
if (mods.OfType<OsuModAutopilot>().Any())
|
|
distanceBonus = 0;
|
|
|
|
// Base difficulty with all bonuses
|
|
double difficulty = (1 + speedBonus + distanceBonus) * 1000 / strainTime;
|
|
|
|
// Apply penalty if there's doubletappable doubles
|
|
return difficulty * doubletapness;
|
|
}
|
|
}
|
|
}
|