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ManiaBeatmapConverter.cs
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ManiaBeatmapConverter.cs
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// 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 osu.Game.Rulesets.Mania.Objects;
using System;
using System.Linq;
using System.Collections.Generic;
using osu.Framework.MathUtils;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Types;
using osu.Game.Rulesets.Mania.Beatmaps.Patterns;
using osu.Game.Rulesets.Mania.MathUtils;
using osu.Game.Rulesets.Mania.Beatmaps.Patterns.Legacy;
using osuTK;
using osu.Game.Audio;
namespace osu.Game.Rulesets.Mania.Beatmaps
{
public class ManiaBeatmapConverter : BeatmapConverter<ManiaHitObject>
{
/// <summary>
/// Maximum number of previous notes to consider for density calculation.
/// </summary>
private const int max_notes_for_density = 7;
protected override IEnumerable<Type> ValidConversionTypes { get; } = new[] { typeof(IHasXPosition) };
public int TargetColumns;
public bool Dual;
public readonly bool IsForCurrentRuleset;
// Internal for testing purposes
internal FastRandom Random { get; private set; }
private Pattern lastPattern = new Pattern();
private ManiaBeatmap beatmap;
public ManiaBeatmapConverter(IBeatmap beatmap)
: base(beatmap)
{
IsForCurrentRuleset = beatmap.BeatmapInfo.Ruleset.Equals(new ManiaRuleset().RulesetInfo);
var roundedCircleSize = Math.Round(beatmap.BeatmapInfo.BaseDifficulty.CircleSize);
var roundedOverallDifficulty = Math.Round(beatmap.BeatmapInfo.BaseDifficulty.OverallDifficulty);
if (IsForCurrentRuleset)
{
TargetColumns = (int)Math.Max(1, roundedCircleSize);
if (TargetColumns >= 10)
{
TargetColumns = TargetColumns / 2;
Dual = true;
}
}
else
{
float percentSliderOrSpinner = (float)beatmap.HitObjects.Count(h => h is IHasEndTime) / beatmap.HitObjects.Count;
if (percentSliderOrSpinner < 0.2)
TargetColumns = 7;
else if (percentSliderOrSpinner < 0.3 || roundedCircleSize >= 5)
TargetColumns = roundedOverallDifficulty > 5 ? 7 : 6;
else if (percentSliderOrSpinner > 0.6)
TargetColumns = roundedOverallDifficulty > 4 ? 5 : 4;
else
TargetColumns = Math.Max(4, Math.Min((int)roundedOverallDifficulty + 1, 7));
}
}
protected override Beatmap<ManiaHitObject> ConvertBeatmap(IBeatmap original)
{
BeatmapDifficulty difficulty = original.BeatmapInfo.BaseDifficulty;
int seed = (int)Math.Round(difficulty.DrainRate + difficulty.CircleSize) * 20 + (int)(difficulty.OverallDifficulty * 41.2) + (int)Math.Round(difficulty.ApproachRate);
Random = new FastRandom(seed);
return base.ConvertBeatmap(original);
}
protected override Beatmap<ManiaHitObject> CreateBeatmap()
{
beatmap = new ManiaBeatmap(new StageDefinition { Columns = TargetColumns });
if (Dual)
beatmap.Stages.Add(new StageDefinition { Columns = TargetColumns });
return beatmap;
}
protected override IEnumerable<ManiaHitObject> ConvertHitObject(HitObject original, IBeatmap beatmap)
{
if (original is ManiaHitObject maniaOriginal)
{
yield return maniaOriginal;
yield break;
}
var objects = IsForCurrentRuleset ? generateSpecific(original, beatmap) : generateConverted(original, beatmap);
if (objects == null)
yield break;
foreach (ManiaHitObject obj in objects)
yield return obj;
}
private readonly List<double> prevNoteTimes = new List<double>(max_notes_for_density);
private double density = int.MaxValue;
private void computeDensity(double newNoteTime)
{
if (prevNoteTimes.Count == max_notes_for_density)
prevNoteTimes.RemoveAt(0);
prevNoteTimes.Add(newNoteTime);
density = (prevNoteTimes[prevNoteTimes.Count - 1] - prevNoteTimes[0]) / prevNoteTimes.Count;
}
private double lastTime;
private Vector2 lastPosition;
private PatternType lastStair = PatternType.Stair;
private void recordNote(double time, Vector2 position)
{
lastTime = time;
lastPosition = position;
}
/// <summary>
/// Method that generates hit objects for osu!mania specific beatmaps.
/// </summary>
/// <param name="original">The original hit object.</param>
/// <param name="originalBeatmap">The original beatmap. This is used to look-up any values dependent on a fully-loaded beatmap.</param>
/// <returns>The hit objects generated.</returns>
private IEnumerable<ManiaHitObject> generateSpecific(HitObject original, IBeatmap originalBeatmap)
{
var generator = new SpecificBeatmapPatternGenerator(Random, original, beatmap, lastPattern, originalBeatmap);
foreach (var newPattern in generator.Generate())
{
lastPattern = newPattern;
foreach (var obj in newPattern.HitObjects)
yield return obj;
}
}
/// <summary>
/// Method that generates hit objects for non-osu!mania beatmaps.
/// </summary>
/// <param name="original">The original hit object.</param>
/// <param name="originalBeatmap">The original beatmap. This is used to look-up any values dependent on a fully-loaded beatmap.</param>
/// <returns>The hit objects generated.</returns>
private IEnumerable<ManiaHitObject> generateConverted(HitObject original, IBeatmap originalBeatmap)
{
var endTimeData = original as IHasEndTime;
var distanceData = original as IHasDistance;
var positionData = original as IHasPosition;
Patterns.PatternGenerator conversion = null;
if (distanceData != null)
{
var generator = new DistanceObjectPatternGenerator(Random, original, beatmap, lastPattern, originalBeatmap);
conversion = generator;
for (double time = original.StartTime; !Precision.DefinitelyBigger(time, generator.EndTime); time += generator.SegmentDuration)
{
recordNote(time, positionData?.Position ?? Vector2.Zero);
computeDensity(time);
}
}
else if (endTimeData != null)
{
conversion = new EndTimeObjectPatternGenerator(Random, original, beatmap, originalBeatmap);
recordNote(endTimeData.EndTime, new Vector2(256, 192));
computeDensity(endTimeData.EndTime);
}
else if (positionData != null)
{
computeDensity(original.StartTime);
conversion = new HitObjectPatternGenerator(Random, original, beatmap, lastPattern, lastTime, lastPosition, density, lastStair, originalBeatmap);
recordNote(original.StartTime, positionData.Position);
}
if (conversion == null)
yield break;
foreach (var newPattern in conversion.Generate())
{
lastPattern = conversion is EndTimeObjectPatternGenerator ? lastPattern : newPattern;
lastStair = (conversion as HitObjectPatternGenerator)?.StairType ?? lastStair;
foreach (var obj in newPattern.HitObjects)
yield return obj;
}
}
/// <summary>
/// A pattern generator for osu!mania-specific beatmaps.
/// </summary>
private class SpecificBeatmapPatternGenerator : Patterns.Legacy.PatternGenerator
{
public SpecificBeatmapPatternGenerator(FastRandom random, HitObject hitObject, ManiaBeatmap beatmap, Pattern previousPattern, IBeatmap originalBeatmap)
: base(random, hitObject, beatmap, previousPattern, originalBeatmap)
{
}
public override IEnumerable<Pattern> Generate()
{
yield return generate();
}
private Pattern generate()
{
var endTimeData = HitObject as IHasEndTime;
var positionData = HitObject as IHasXPosition;
int column = GetColumn(positionData?.X ?? 0);
var pattern = new Pattern();
if (endTimeData != null)
{
pattern.Add(new HoldNote
{
StartTime = HitObject.StartTime,
Duration = endTimeData.Duration,
Column = column,
Head = { Samples = sampleInfoListAt(HitObject.StartTime) },
Tail = { Samples = sampleInfoListAt(endTimeData.EndTime) },
});
}
else if (positionData != null)
{
pattern.Add(new Note
{
StartTime = HitObject.StartTime,
Samples = HitObject.Samples,
Column = column
});
}
return pattern;
}
/// <summary>
/// Retrieves the sample info list at a point in time.
/// </summary>
/// <param name="time">The time to retrieve the sample info list from.</param>
/// <returns></returns>
private List<SampleInfo> sampleInfoListAt(double time)
{
var curveData = HitObject as IHasCurve;
if (curveData == null)
return HitObject.Samples;
double segmentTime = (curveData.EndTime - HitObject.StartTime) / curveData.SpanCount();
int index = (int)(segmentTime == 0 ? 0 : (time - HitObject.StartTime) / segmentTime);
return curveData.NodeSamples[index];
}
}
}
}