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osu-lazer/osu.Game.Rulesets.Osu/Mods/OsuModSynesthesia.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.
2023-05-13 10:43:28 +08:00
using osu.Game.Beatmaps;
using osu.Game.Graphics;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Objects;
using osu.Game.Rulesets.Objects.Drawables;
using osu.Game.Rulesets.Osu.Objects.Drawables;
using osu.Game.Screens.Edit;
using osuTK.Graphics;
namespace osu.Game.Rulesets.Osu.Mods
{
/// <summary>
/// Mod that colours <see cref="HitObject"/>s based on the musical division they are on
/// </summary>
public class OsuModSynesthesia : ModSynesthesia, IApplicableToBeatmap, IApplicableToDrawableHitObject
{
private readonly OsuColour colours = new OsuColour();
private IBeatmap? currentBeatmap { get; set; }
public void ApplyToBeatmap(IBeatmap beatmap)
{
//Store a reference to the current beatmap to look up the beat divisor when notes are drawn
if (currentBeatmap != beatmap)
currentBeatmap = beatmap;
}
public void ApplyToDrawableHitObject(DrawableHitObject d)
{
if (currentBeatmap == null) return;
Color4? timingBasedColour = null;
d.HitObjectApplied += _ =>
{
// slider tails are a painful edge case, as their start time is offset 36ms back (see `LastTick`).
// to work around this, look up the slider tail's parenting slider's end time instead to ensure proper snap.
double snapTime = d is DrawableSliderTail tail
? tail.Slider.GetEndTime()
: d.HitObject.StartTime;
timingBasedColour = BindableBeatDivisor.GetColourFor(currentBeatmap.ControlPointInfo.GetClosestBeatDivisor(snapTime), colours);
};
// Need to set this every update to ensure it doesn't get overwritten by DrawableHitObject.OnApply() -> UpdateComboColour().
d.OnUpdate += _ =>
{
if (timingBasedColour != null)
d.AccentColour.Value = timingBasedColour.Value;
};
}
}
}