osu/osu.Game.Rulesets.Mania/Mods/ManiaModInvert.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 System;
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using System.Collections.Generic;
using System.Linq;
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using osu.Framework.Graphics.Sprites;
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using osu.Game.Audio;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mania.Beatmaps;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Rulesets.Mods;
namespace osu.Game.Rulesets.Mania.Mods
{
public class ManiaModInvert : Mod, IApplicableAfterBeatmapConversion
{
public override string Name => "Invert";
public override string Acronym => "IN";
public override double ScoreMultiplier => 1;
public override string Description => "Hold the keys. To the beat.";
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public override IconUsage? Icon => FontAwesome.Solid.YinYang;
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public override ModType Type => ModType.Conversion;
public void ApplyToBeatmap(IBeatmap beatmap)
{
var maniaBeatmap = (ManiaBeatmap)beatmap;
var newObjects = new List<ManiaHitObject>();
foreach (var column in maniaBeatmap.HitObjects.GroupBy(h => h.Column))
{
var newColumnObjects = new List<ManiaHitObject>();
var locations = column.OfType<Note>().Select(n => (startTime: n.StartTime, samples: n.Samples))
.Concat(column.OfType<HoldNote>().SelectMany(h => new[]
{
(startTime: h.StartTime, samples: h.GetNodeSamples(0)),
(startTime: h.EndTime, samples: h.GetNodeSamples(1))
}))
.OrderBy(h => h.startTime).ToList();
for (int i = 0; i < locations.Count - 1; i++)
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{
// Full duration of the hold note.
double duration = locations[i + 1].startTime - locations[i].startTime;
// Beat length at the end of the hold note.
double beatLength = beatmap.ControlPointInfo.TimingPointAt(locations[i + 1].startTime).BeatLength;
// Decrease the duration by at most a 1/4 beat to ensure there's no instantaneous notes.
duration = Math.Max(duration / 2, duration - beatLength / 4);
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newColumnObjects.Add(new HoldNote
{
Column = column.Key,
StartTime = locations[i].startTime,
Duration = duration,
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NodeSamples = new List<IList<HitSampleInfo>> { locations[i].samples, Array.Empty<HitSampleInfo>() }
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});
}
newObjects.AddRange(newColumnObjects);
}
maniaBeatmap.HitObjects = newObjects.OrderBy(h => h.StartTime).ToList();
// No breaks
maniaBeatmap.Breaks.Clear();
}
}
}