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Merge pull request #18769 from Pasi4K5/enhance-randomisation

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Enhance angle calculations of the Random mod
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Dean Herbert 2022-09-09 19:40:47 +09:00 committed by GitHub
commit 8ea739ef25
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2 changed files with 111 additions and 14 deletions
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90
osu.Game.Rulesets.Osu/Mods/OsuModRandom.cs
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@ -2,6 +2,7 @@
// See the LICENCE file in the repository root for full licence text.
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Localisation;
using osu.Framework.Utils;
@ -9,6 +10,7 @@ using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Osu.Beatmaps;
using osu.Game.Rulesets.Osu.Objects;
using osu.Game.Rulesets.Osu.UI;
using osu.Game.Rulesets.Osu.Utils;
@ -25,40 +27,100 @@ namespace osu.Game.Rulesets.Osu.Mods
private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast;
private Random? rng;
private Random random = null!;
public void ApplyToBeatmap(IBeatmap beatmap)
{
if (!(beatmap is OsuBeatmap osuBeatmap))
if (beatmap is not OsuBeatmap osuBeatmap)
return;
Seed.Value ??= RNG.Next();
rng = new Random((int)Seed.Value);
random = new Random((int)Seed.Value);
var positionInfos = OsuHitObjectGenerationUtils.GeneratePositionInfos(osuBeatmap.HitObjects);
float rateOfChangeMultiplier = 0;
// Offsets the angles of all hit objects in a "section" by the same amount.
float sectionOffset = 0;
foreach (var positionInfo in positionInfos)
// Whether the angles are positive or negative (clockwise or counter-clockwise flow).
bool flowDirection = false;
for (int i = 0; i < positionInfos.Count; i++)
{
// rateOfChangeMultiplier only changes every 5 iterations in a combo
// to prevent shaky-line-shaped streams
if (positionInfo.HitObject.IndexInCurrentCombo % 5 == 0)
rateOfChangeMultiplier = (float)rng.NextDouble() * 2 - 1;
if (positionInfo == positionInfos.First())
if (shouldStartNewSection(osuBeatmap, positionInfos, i))
{
positionInfo.DistanceFromPrevious = (float)(rng.NextDouble() * OsuPlayfield.BASE_SIZE.Y / 2);
positionInfo.RelativeAngle = (float)(rng.NextDouble() * 2 * Math.PI - Math.PI);
sectionOffset = OsuHitObjectGenerationUtils.RandomGaussian(random, 0, 0.0008f);
flowDirection = !flowDirection;
}
if (i == 0)
{
positionInfos[i].DistanceFromPrevious = (float)(random.NextDouble() * OsuPlayfield.BASE_SIZE.Y / 2);
positionInfos[i].RelativeAngle = (float)(random.NextDouble() * 2 * Math.PI - Math.PI);
}
else
{
positionInfo.RelativeAngle = rateOfChangeMultiplier * 2 * (float)Math.PI * Math.Min(1f, positionInfo.DistanceFromPrevious / (playfield_diagonal * 0.5f));
// Offsets only the angle of the current hit object if a flow change occurs.
float flowChangeOffset = 0;
// Offsets only the angle of the current hit object.
float oneTimeOffset = OsuHitObjectGenerationUtils.RandomGaussian(random, 0, 0.002f);
if (shouldApplyFlowChange(positionInfos, i))
{
flowChangeOffset = OsuHitObjectGenerationUtils.RandomGaussian(random, 0, 0.002f);
flowDirection = !flowDirection;
}
float totalOffset =
// sectionOffset and oneTimeOffset should mainly affect patterns with large spacing.
(sectionOffset + oneTimeOffset) * positionInfos[i].DistanceFromPrevious +
// flowChangeOffset should mainly affect streams.
flowChangeOffset * (playfield_diagonal - positionInfos[i].DistanceFromPrevious);
positionInfos[i].RelativeAngle = getRelativeTargetAngle(positionInfos[i].DistanceFromPrevious, totalOffset, flowDirection);
}
}
osuBeatmap.HitObjects = OsuHitObjectGenerationUtils.RepositionHitObjects(positionInfos);
}
/// <param name="targetDistance">The target distance between the previous and the current <see cref="OsuHitObject"/>.</param>
/// <param name="offset">The angle (in rad) by which the target angle should be offset.</param>
/// <param name="flowDirection">Whether the relative angle should be positive or negative.</param>
private static float getRelativeTargetAngle(float targetDistance, float offset, bool flowDirection)
{
float angle = (float)(2.16 / (1 + 200 * Math.Exp(0.036 * (targetDistance - 310))) + 0.5 + offset);
float relativeAngle = (float)Math.PI - angle;
return flowDirection ? -relativeAngle : relativeAngle;
}
/// <returns>Whether a new section should be started at the current <see cref="OsuHitObject"/>.</returns>
private bool shouldStartNewSection(OsuBeatmap beatmap, IReadOnlyList<OsuHitObjectGenerationUtils.ObjectPositionInfo> positionInfos, int i)
{
if (i == 0)
return true;
// Exclude new-combo-spam and 1-2-combos.
bool previousObjectStartedCombo = positionInfos[Math.Max(0, i - 2)].HitObject.IndexInCurrentCombo > 1 &&
positionInfos[i - 1].HitObject.NewCombo;
bool previousObjectWasOnDownbeat = OsuHitObjectGenerationUtils.IsHitObjectOnBeat(beatmap, positionInfos[i - 1].HitObject, true);
bool previousObjectWasOnBeat = OsuHitObjectGenerationUtils.IsHitObjectOnBeat(beatmap, positionInfos[i - 1].HitObject);
return (previousObjectStartedCombo && random.NextDouble() < 0.6f) ||
previousObjectWasOnDownbeat ||
(previousObjectWasOnBeat && random.NextDouble() < 0.4f);
}
/// <returns>Whether a flow change should be applied at the current <see cref="OsuHitObject"/>.</returns>
private bool shouldApplyFlowChange(IReadOnlyList<OsuHitObjectGenerationUtils.ObjectPositionInfo> positionInfos, int i)
{
// Exclude new-combo-spam and 1-2-combos.
bool previousObjectStartedCombo = positionInfos[Math.Max(0, i - 2)].HitObject.IndexInCurrentCombo > 1 &&
positionInfos[i - 1].HitObject.NewCombo;
return previousObjectStartedCombo && random.NextDouble() < 0.6f;
}
}
}

35
osu.Game.Rulesets.Osu/Utils/OsuHitObjectGenerationUtils.cs
View File

@ -8,6 +8,7 @@ using System.Linq;
using osu.Framework.Extensions.IEnumerableExtensions;
using osu.Game.Rulesets.Osu.UI;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Osu.Beatmaps;
using osu.Game.Rulesets.Osu.Objects;
using osuTK;
@ -186,5 +187,39 @@ namespace osu.Game.Rulesets.Osu.Utils
length * MathF.Sin(angle)
);
}
/// <param name="beatmap">The beatmap hitObject is a part of.</param>
/// <param name="hitObject">The <see cref="OsuHitObject"/> that should be checked.</param>
/// <param name="downbeatsOnly">If true, this method only returns true if hitObject is on a downbeat.
/// If false, it returns true if hitObject is on any beat.</param>
/// <returns>true if hitObject is on a (down-)beat, false otherwise.</returns>
public static bool IsHitObjectOnBeat(OsuBeatmap beatmap, OsuHitObject hitObject, bool downbeatsOnly = false)
{
var timingPoint = beatmap.ControlPointInfo.TimingPointAt(hitObject.StartTime);
double timeSinceTimingPoint = hitObject.StartTime - timingPoint.Time;
double beatLength = timingPoint.BeatLength;
if (downbeatsOnly)
beatLength *= timingPoint.TimeSignature.Numerator;
// Ensure within 1ms of expected location.
return Math.Abs(timeSinceTimingPoint + 1) % beatLength < 2;
}
/// <summary>
/// Generates a random number from a normal distribution using the Box-Muller transform.
/// </summary>
public static float RandomGaussian(Random rng, float mean = 0, float stdDev = 1)
{
// Generate 2 random numbers in the interval (0,1].
// x1 must not be 0 since log(0) = undefined.
double x1 = 1 - rng.NextDouble();
double x2 = 1 - rng.NextDouble();
double stdNormal = Math.Sqrt(-2 * Math.Log(x1)) * Math.Sin(2 * Math.PI * x2);
return mean + stdDev * (float)stdNormal;
}
}
}