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Code Issues Releases Wiki Activity

Test for accuracy of perfect curves

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Aurelian 2024-05-27 19:35:33 +02:00
parent b2c4e0e951
commit d81be56adf
1 changed files with 99 additions and 26 deletions
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109
osu.Game.Rulesets.Osu.Tests/Editor/TestSliderScaling.cs
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@ -3,8 +3,10 @@
#nullable disable
using System;
using System.Linq;
using NUnit.Framework;
using osu.Framework.Graphics.Primitives;
using osu.Framework.Testing;
using osu.Framework.Utils;
using osu.Game.Beatmaps;
@ -72,48 +74,119 @@ namespace osu.Game.Rulesets.Osu.Tests.Editor
private void moveMouse(Vector2 pos) =>
AddStep($"move mouse to {pos}", () => InputManager.MoveMouseTo(playfield.ToScreenSpace(pos)));
}
[TestFixture]
public class TestSliderNearLinearScaling
{
private readonly Random rng = new Random(1337);
[Test]
public void TestScalingSliderFlat()
{
Slider sliderPerfect = new Slider
{
Position = new Vector2(300),
Path = new SliderPath(
SliderPath sliderPathPerfect = new SliderPath(
[
new PathControlPoint(new Vector2(0), PathType.PERFECT_CURVE),
new PathControlPoint(new Vector2(50, 25)),
new PathControlPoint(new Vector2(25, 100)),
])
};
]);
Slider sliderBezier = new Slider
{
Position = new Vector2(300),
Path = new SliderPath(
SliderPath sliderPathBezier = new SliderPath(
[
new PathControlPoint(new Vector2(0), PathType.BEZIER),
new PathControlPoint(new Vector2(50, 25)),
new PathControlPoint(new Vector2(25, 100)),
])
};
]);
scaleSlider(sliderPerfect, new Vector2(0.000001f, 1));
scaleSlider(sliderBezier, new Vector2(0.000001f, 1));
scaleSlider(sliderPathPerfect, new Vector2(0.000001f, 1));
scaleSlider(sliderPathBezier, new Vector2(0.000001f, 1));
for (int i = 0; i < 100; i++)
{
Assert.True(Precision.AlmostEquals(sliderPerfect.Path.PositionAt(i / 100.0f), sliderBezier.Path.PositionAt(i / 100.0f)));
Assert.True(Precision.AlmostEquals(sliderPathPerfect.PositionAt(i / 100.0f), sliderPathBezier.PositionAt(i / 100.0f)));
}
}
private void scaleSlider(Slider slider, Vector2 scale)
[Test]
public void TestPerfectCurveMatchesTheoretical()
{
for (int i = 0; i < slider.Path.ControlPoints.Count; i++)
for (int i = 0; i < 20000; i++)
{
slider.Path.ControlPoints[i].Position *= scale;
//Only test points that are in the screen's bounds
float p1X = 640.0f * (float)rng.NextDouble();
float p2X = 640.0f * (float)rng.NextDouble();
float p1Y = 480.0f * (float)rng.NextDouble();
float p2Y = 480.0f * (float)rng.NextDouble();
SliderPath sliderPathPerfect = new SliderPath(
[
new PathControlPoint(new Vector2(0, 0), PathType.PERFECT_CURVE),
new PathControlPoint(new Vector2(p1X, p1Y)),
new PathControlPoint(new Vector2(p2X, p2Y)),
]);
assertMatchesPerfectCircle(sliderPathPerfect);
scaleSlider(sliderPathPerfect, new Vector2(0.00001f, 1));
assertMatchesPerfectCircle(sliderPathPerfect);
}
}
private void assertMatchesPerfectCircle(SliderPath path)
{
if (path.ControlPoints.Count != 3)
return;
//Replication of PathApproximator.CircularArcToPiecewiseLinear
CircularArcProperties circularArcProperties = new CircularArcProperties(path.ControlPoints.Select(x => x.Position).ToArray());
if (!circularArcProperties.IsValid)
return;
//Addresses cases where circularArcProperties.ThetaRange>0.5
//Occurs in code in PathControlPointVisualiser.ensureValidPathType
RectangleF boundingBox = PathApproximator.CircularArcBoundingBox(path.ControlPoints.Select(x => x.Position).ToArray());
if (boundingBox.Width >= 640 || boundingBox.Height >= 480)
return;
int subpoints = (2f * circularArcProperties.Radius <= 0.1f) ? 2 : Math.Max(2, (int)Math.Ceiling(circularArcProperties.ThetaRange / (2.0 * Math.Acos(1f - 0.1f / circularArcProperties.Radius))));
//ignore cases where subpoints is int.MaxValue, result will be garbage
//as well, having this many subpoints will cause an out of memory error, so can't happen during normal useage
if (subpoints == int.MaxValue)
return;
for (int i = 0; i < Math.Min(subpoints, 100); i++)
{
float progress = (float)rng.NextDouble();
//To avoid errors from interpolating points, ensure we check only positions that would be subpoints.
progress = (float)Math.Ceiling(progress * (subpoints - 1)) / (subpoints - 1);
//Special case - if few subpoints, ensure checking every single one rather than randomly
if (subpoints < 100)
progress = i / (float)(subpoints - 1);
//edge points cause issue with interpolation, so ignore the last two points and first
if (progress == 0.0f || progress >= (subpoints - 2) / (float)(subpoints - 1))
continue;
double theta = circularArcProperties.ThetaStart + circularArcProperties.Direction * progress * circularArcProperties.ThetaRange;
Vector2 vector = new Vector2((float)Math.Cos(theta), (float)Math.Sin(theta)) * circularArcProperties.Radius;
Assert.True(Precision.AlmostEquals(circularArcProperties.Centre + vector, path.PositionAt(progress), 0.01f),
"A perfect circle with points " + string.Join(", ", path.ControlPoints.Select(x => x.Position)) + " and radius" + circularArcProperties.Radius + "from SliderPath does not almost equal a theoretical perfect circle with " + subpoints + " subpoints"
+ ": " + (circularArcProperties.Centre + vector) + " - " + path.PositionAt(progress)
+ " = " + (circularArcProperties.Centre + vector - path.PositionAt(progress))
);
}
}
private void scaleSlider(SliderPath path, Vector2 scale)
{
for (int i = 0; i < path.ControlPoints.Count; i++)
{
path.ControlPoints[i].Position *= scale;
}
}
}