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Merge pull request #13688 from Henry-YSLin/osu-random-mod-improvements

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Improve osu random mod
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Dean Herbert 2021-07-13 22:17:55 +09:00 committed by GitHub
commit b183b1e3dd
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1 changed files with 142 additions and 34 deletions
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176
osu.Game.Rulesets.Osu/Mods/OsuModRandom.cs
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@ -4,7 +4,7 @@
using System;
using System.Collections.Generic;
using System.Linq;
using osu.Framework.Graphics;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Utils;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mods;
@ -26,6 +26,11 @@ namespace osu.Game.Rulesets.Osu.Mods
private static readonly float playfield_diagonal = OsuPlayfield.BASE_SIZE.LengthFast;
/// <summary>
/// Number of previous hitobjects to be shifted together when another object is being moved.
/// </summary>
private const int preceding_hitobjects_to_shift = 10;
private Random rng;
public void ApplyToBeatmap(IBeatmap beatmap)
@ -49,8 +54,9 @@ namespace osu.Game.Rulesets.Osu.Mods
var current = new RandomObjectInfo(hitObject);
// rateOfChangeMultiplier only changes every i iterations to prevent shaky-line-shaped streams
if (i % 3 == 0)
// rateOfChangeMultiplier only changes every 5 iterations in a combo
// to prevent shaky-line-shaped streams
if (hitObject.IndexInCurrentCombo % 5 == 0)
rateOfChangeMultiplier = (float)rng.NextDouble() * 2 - 1;
if (hitObject is Spinner)
@ -61,13 +67,35 @@ namespace osu.Game.Rulesets.Osu.Mods
applyRandomisation(rateOfChangeMultiplier, previous, current);
hitObject.Position = current.PositionRandomised;
// Move hit objects back into the playfield if they are outside of it
Vector2 shift = Vector2.Zero;
// update end position as it may have changed as a result of the position update.
current.EndPositionRandomised = current.PositionRandomised;
switch (hitObject)
{
case HitCircle circle:
shift = clampHitCircleToPlayfield(circle, current);
break;
if (hitObject is Slider slider)
moveSliderIntoPlayfield(slider, current);
case Slider slider:
shift = clampSliderToPlayfield(slider, current);
break;
}
if (shift != Vector2.Zero)
{
var toBeShifted = new List<OsuHitObject>();
for (int j = i - 1; j >= i - preceding_hitobjects_to_shift && j >= 0; j--)
{
// only shift hit circles
if (!(hitObjects[j] is HitCircle)) break;
toBeShifted.Add(hitObjects[j]);
}
if (toBeShifted.Count > 0)
applyDecreasingShift(toBeShifted, shift);
}
previous = current;
}
@ -94,7 +122,9 @@ namespace osu.Game.Rulesets.Osu.Mods
// The max. angle (relative to the angle of the vector pointing from the 2nd last to the last hit object)
// is proportional to the distance between the last and the current hit object
// to allow jumps and prevent too sharp turns during streams.
var randomAngleRad = rateOfChangeMultiplier * 2 * Math.PI * distanceToPrev / playfield_diagonal;
// Allow maximum jump angle when jump distance is more than half of playfield diagonal length
var randomAngleRad = rateOfChangeMultiplier * 2 * Math.PI * Math.Min(1f, distanceToPrev / (playfield_diagonal * 0.5f));
current.AngleRad = (float)randomAngleRad + previous.AngleRad;
if (current.AngleRad < 0)
@ -109,56 +139,120 @@ namespace osu.Game.Rulesets.Osu.Mods
current.AngleRad = (float)Math.Atan2(posRelativeToPrev.Y, posRelativeToPrev.X);
var position = previous.EndPositionRandomised + posRelativeToPrev;
current.PositionRandomised = previous.EndPositionRandomised + posRelativeToPrev;
}
// Move hit objects back into the playfield if they are outside of it,
// which would sometimes happen during big jumps otherwise.
position.X = MathHelper.Clamp(position.X, 0, OsuPlayfield.BASE_SIZE.X);
position.Y = MathHelper.Clamp(position.Y, 0, OsuPlayfield.BASE_SIZE.Y);
/// <summary>
/// Move the randomised position of a hit circle so that it fits inside the playfield.
/// </summary>
/// <returns>The deviation from the original randomised position in order to fit within the playfield.</returns>
private Vector2 clampHitCircleToPlayfield(HitCircle circle, RandomObjectInfo objectInfo)
{
var previousPosition = objectInfo.PositionRandomised;
objectInfo.EndPositionRandomised = objectInfo.PositionRandomised = clampToPlayfieldWithPadding(
objectInfo.PositionRandomised,
(float)circle.Radius
);
current.PositionRandomised = position;
circle.Position = objectInfo.PositionRandomised;
return objectInfo.PositionRandomised - previousPosition;
}
/// <summary>
/// Moves the <see cref="Slider"/> and all necessary nested <see cref="OsuHitObject"/>s into the <see cref="OsuPlayfield"/> if they aren't already.
/// </summary>
private void moveSliderIntoPlayfield(Slider slider, RandomObjectInfo currentObjectInfo)
/// <returns>The deviation from the original randomised position in order to fit within the playfield.</returns>
private Vector2 clampSliderToPlayfield(Slider slider, RandomObjectInfo objectInfo)
{
var minMargin = getMinSliderMargin(slider);
var possibleMovementBounds = calculatePossibleMovementBounds(slider);
slider.Position = new Vector2(
Math.Clamp(slider.Position.X, minMargin.Left, OsuPlayfield.BASE_SIZE.X - minMargin.Right),
Math.Clamp(slider.Position.Y, minMargin.Top, OsuPlayfield.BASE_SIZE.Y - minMargin.Bottom)
);
var previousPosition = objectInfo.PositionRandomised;
currentObjectInfo.PositionRandomised = slider.Position;
currentObjectInfo.EndPositionRandomised = slider.EndPosition;
// Clamp slider position to the placement area
// If the slider is larger than the playfield, force it to stay at the original position
var newX = possibleMovementBounds.Width < 0
? objectInfo.PositionOriginal.X
: Math.Clamp(previousPosition.X, possibleMovementBounds.Left, possibleMovementBounds.Right);
shiftNestedObjects(slider, currentObjectInfo.PositionRandomised - currentObjectInfo.PositionOriginal);
var newY = possibleMovementBounds.Height < 0
? objectInfo.PositionOriginal.Y
: Math.Clamp(previousPosition.Y, possibleMovementBounds.Top, possibleMovementBounds.Bottom);
slider.Position = objectInfo.PositionRandomised = new Vector2(newX, newY);
objectInfo.EndPositionRandomised = slider.EndPosition;
shiftNestedObjects(slider, objectInfo.PositionRandomised - objectInfo.PositionOriginal);
return objectInfo.PositionRandomised - previousPosition;
}
/// <summary>
/// Calculates the min. distances from the <see cref="Slider"/>'s position to the playfield border for the slider to be fully inside of the playfield.
/// Decreasingly shift a list of <see cref="OsuHitObject"/>s by a specified amount.
/// The first item in the list is shifted by the largest amount, while the last item is shifted by the smallest amount.
/// </summary>
private MarginPadding getMinSliderMargin(Slider slider)
/// <param name="hitObjects">The list of hit objects to be shifted.</param>
/// <param name="shift">The amount to be shifted.</param>
private void applyDecreasingShift(IList<OsuHitObject> hitObjects, Vector2 shift)
{
for (int i = 0; i < hitObjects.Count; i++)
{
var hitObject = hitObjects[i];
// The first object is shifted by a vector slightly smaller than shift
// The last object is shifted by a vector slightly larger than zero
Vector2 position = hitObject.Position + shift * ((hitObjects.Count - i) / (float)(hitObjects.Count + 1));
hitObject.Position = clampToPlayfieldWithPadding(position, (float)hitObject.Radius);
}
}
/// <summary>
/// Calculates a <see cref="RectangleF"/> which contains all of the possible movements of the slider (in relative X/Y coordinates)
/// such that the entire slider is inside the playfield.
/// </summary>
/// <remarks>
/// If the slider is larger than the playfield, the returned <see cref="RectangleF"/> may have negative width/height.
/// </remarks>
private RectangleF calculatePossibleMovementBounds(Slider slider)
{
var pathPositions = new List<Vector2>();
slider.Path.GetPathToProgress(pathPositions, 0, 1);
var minMargin = new MarginPadding();
float minX = float.PositiveInfinity;
float maxX = float.NegativeInfinity;
float minY = float.PositiveInfinity;
float maxY = float.NegativeInfinity;
// Compute the bounding box of the slider.
foreach (var pos in pathPositions)
{
minMargin.Left = Math.Max(minMargin.Left, -pos.X);
minMargin.Right = Math.Max(minMargin.Right, pos.X);
minMargin.Top = Math.Max(minMargin.Top, -pos.Y);
minMargin.Bottom = Math.Max(minMargin.Bottom, pos.Y);
minX = MathF.Min(minX, pos.X);
maxX = MathF.Max(maxX, pos.X);
minY = MathF.Min(minY, pos.Y);
maxY = MathF.Max(maxY, pos.Y);
}
minMargin.Left = Math.Min(minMargin.Left, OsuPlayfield.BASE_SIZE.X - minMargin.Right);
minMargin.Top = Math.Min(minMargin.Top, OsuPlayfield.BASE_SIZE.Y - minMargin.Bottom);
// Take the circle radius into account.
var radius = (float)slider.Radius;
return minMargin;
minX -= radius;
minY -= radius;
maxX += radius;
maxY += radius;
// Given the bounding box of the slider (via min/max X/Y),
// the amount that the slider can move to the left is minX (with the sign flipped, since positive X is to the right),
// and the amount that it can move to the right is WIDTH - maxX.
// Same calculation applies for the Y axis.
float left = -minX;
float right = OsuPlayfield.BASE_SIZE.X - maxX;
float top = -minY;
float bottom = OsuPlayfield.BASE_SIZE.Y - maxY;
return new RectangleF(left, top, right - left, bottom - top);
}
/// <summary>
@ -177,6 +271,20 @@ namespace osu.Game.Rulesets.Osu.Mods
}
}
/// <summary>
/// Clamp a position to playfield, keeping a specified distance from the edges.
/// </summary>
/// <param name="position">The position to be clamped.</param>
/// <param name="padding">The minimum distance allowed from playfield edges.</param>
/// <returns>The clamped position.</returns>
private Vector2 clampToPlayfieldWithPadding(Vector2 position, float padding)
{
return new Vector2(
Math.Clamp(position.X, padding, OsuPlayfield.BASE_SIZE.X - padding),
Math.Clamp(position.Y, padding, OsuPlayfield.BASE_SIZE.Y - padding)
);
}
private class RandomObjectInfo
{
public float AngleRad { get; set; }