1
0
mirror of https://github.com/ppy/osu.git synced 2024-12-17 12:13:52 +08:00
osu-lazer/osu.Game/Rulesets/Objects/BarLineGenerator.cs
2020-01-09 13:43:44 +09:00

59 lines
2.2 KiB
C#

// 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.Collections.Generic;
using System.Linq;
using osu.Framework.Utils;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.ControlPoints;
namespace osu.Game.Rulesets.Objects
{
public class BarLineGenerator<TBarLine>
where TBarLine : class, IBarLine, new()
{
/// <summary>
/// The generated bar lines.
/// </summary>
public readonly List<TBarLine> BarLines = new List<TBarLine>();
/// <summary>
/// Constructs and generates bar lines for provided beatmap.
/// </summary>
/// <param name="beatmap">The beatmap to generate bar lines for.</param>
public BarLineGenerator(IBeatmap beatmap)
{
if (beatmap.HitObjects.Count == 0)
return;
HitObject lastObject = beatmap.HitObjects.Last();
double lastHitTime = 1 + lastObject.GetEndTime();
var timingPoints = beatmap.ControlPointInfo.TimingPoints;
if (timingPoints.Count == 0)
return;
for (int i = 0; i < timingPoints.Count; i++)
{
TimingControlPoint currentTimingPoint = timingPoints[i];
int currentBeat = 0;
// Stop on the beat before the next timing point, or if there is no next timing point stop slightly past the last object
double endTime = i < timingPoints.Count - 1 ? timingPoints[i + 1].Time - currentTimingPoint.BeatLength : lastHitTime + currentTimingPoint.BeatLength * (int)currentTimingPoint.TimeSignature;
double barLength = currentTimingPoint.BeatLength * (int)currentTimingPoint.TimeSignature;
for (double t = currentTimingPoint.Time; Precision.DefinitelyBigger(endTime, t); t += barLength, currentBeat++)
{
BarLines.Add(new TBarLine
{
StartTime = t,
Major = currentBeat % (int)currentTimingPoint.TimeSignature == 0
});
}
}
}
}
}