osu/osu.Game.Tests/NonVisual/ClosestBeatDivisorTest.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.
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#nullable disable
using System.Collections.Generic;
using NUnit.Framework;
using osu.Game.Beatmaps;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Rulesets.Objects;
namespace osu.Game.Tests.NonVisual
{
public class ClosestBeatDivisorTest
{
[Test]
public void TestExactDivisors()
{
var cpi = new ControlPointInfo();
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cpi.Add(0, new TimingControlPoint { BeatLength = 1000 });
double[] divisors = { 3, 1, 16, 12, 8, 6, 4, 3, 2, 1 };
assertClosestDivisors(divisors, divisors, cpi);
}
[Test]
public void TestExactDivisorWithTempoChanges()
{
int offset = 0;
int[] beatLengths = { 1000, 200, 100, 50 };
var cpi = new ControlPointInfo();
foreach (int beatLength in beatLengths)
{
cpi.Add(offset, new TimingControlPoint { BeatLength = beatLength });
offset += beatLength * 2;
}
double[] divisors = { 3, 1, 16, 12, 8, 6, 4, 3 };
assertClosestDivisors(divisors, divisors, cpi);
}
[Test]
public void TestExactDivisorsHighBPMStream()
{
var cpi = new ControlPointInfo();
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cpi.Add(0, new TimingControlPoint { BeatLength = 50 }); // 1200 BPM 1/4 (limit testing)
// A 1/4 stream should land on 1/1, 1/2 and 1/4 divisors.
double[] divisors = { 4, 4, 4, 4, 4, 4, 4, 4 };
double[] closestDivisors = { 4, 2, 4, 1, 4, 2, 4, 1 };
assertClosestDivisors(divisors, closestDivisors, cpi, step: 1 / 4d);
}
[Test]
public void TestApproximateDivisors()
{
var cpi = new ControlPointInfo();
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cpi.Add(0, new TimingControlPoint { BeatLength = 1000 });
double[] divisors = { 3.03d, 0.97d, 14, 13, 7.94d, 6.08d, 3.93d, 2.96d, 2.02d, 64 };
double[] closestDivisors = { 3, 1, 16, 12, 8, 6, 4, 3, 2, 1 };
assertClosestDivisors(divisors, closestDivisors, cpi);
}
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private static void assertClosestDivisors(IReadOnlyList<double> divisors, IReadOnlyList<double> closestDivisors, ControlPointInfo cpi, double step = 1)
{
List<HitObject> hitobjects = new List<HitObject>();
double offset = cpi.TimingPoints[0].Time;
for (int i = 0; i < divisors.Count; ++i)
{
double beatLength = cpi.TimingPointAt(offset).BeatLength;
hitobjects.Add(new HitObject { StartTime = offset + beatLength / divisors[i] });
offset += beatLength * step;
}
var beatmap = new Beatmap
{
HitObjects = hitobjects,
ControlPointInfo = cpi
};
for (int i = 0; i < divisors.Count; ++i)
Assert.AreEqual(closestDivisors[i], beatmap.ControlPointInfo.GetClosestBeatDivisor(beatmap.HitObjects[i].StartTime), $"at index {i}");
}
}
}