AJ Isaacs
c40941ed35
Add EllipseConverter static class with foundational methods for converting ellipse parameters to circular arcs: EvaluatePoint, EvaluateTangent, EvaluateNormal, and IntersectNormals. All 8 unit tests pass. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
82 lines
2.3 KiB
C#
82 lines
2.3 KiB
C#
using OpenNest.Geometry;
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using OpenNest.Math;
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using Xunit;
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namespace OpenNest.Tests;
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public class EllipseConverterTests
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{
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private const double Tol = 1e-10;
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[Fact]
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public void EvaluatePoint_AtZero_ReturnsMajorAxisEnd()
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{
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var p = EllipseConverter.EvaluatePoint(10, 5, 0, new Vector(0, 0), 0);
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Assert.InRange(p.X, 10 - Tol, 10 + Tol);
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Assert.InRange(p.Y, -Tol, Tol);
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}
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[Fact]
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public void EvaluatePoint_AtHalfPi_ReturnsMinorAxisEnd()
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{
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var p = EllipseConverter.EvaluatePoint(10, 5, 0, new Vector(0, 0), System.Math.PI / 2);
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Assert.InRange(p.X, -Tol, Tol);
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Assert.InRange(p.Y, 5 - Tol, 5 + Tol);
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}
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[Fact]
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public void EvaluatePoint_WithRotation_RotatesCorrectly()
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{
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var p = EllipseConverter.EvaluatePoint(10, 5, System.Math.PI / 2, new Vector(0, 0), 0);
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Assert.InRange(p.X, -Tol, Tol);
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Assert.InRange(p.Y, 10 - Tol, 10 + Tol);
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}
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[Fact]
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public void EvaluatePoint_WithCenter_TranslatesCorrectly()
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{
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var p = EllipseConverter.EvaluatePoint(10, 5, 0, new Vector(100, 200), 0);
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Assert.InRange(p.X, 110 - Tol, 110 + Tol);
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Assert.InRange(p.Y, 200 - Tol, 200 + Tol);
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}
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[Fact]
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public void EvaluateTangent_AtZero_PointsUp()
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{
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var t = EllipseConverter.EvaluateTangent(10, 5, 0, 0);
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Assert.InRange(t.X, -Tol, Tol);
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Assert.True(t.Y > 0);
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}
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[Fact]
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public void EvaluateNormal_AtZero_PointsInward()
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{
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var n = EllipseConverter.EvaluateNormal(10, 5, 0, 0);
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Assert.True(n.X < 0);
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Assert.InRange(n.Y, -Tol, Tol);
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}
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[Fact]
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public void IntersectNormals_PerpendicularNormals_FindsCenter()
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{
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var p1 = new Vector(5, 0);
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var n1 = new Vector(-1, 0);
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var p2 = new Vector(0, 5);
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var n2 = new Vector(0, -1);
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var center = EllipseConverter.IntersectNormals(p1, n1, p2, n2);
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Assert.InRange(center.X, -Tol, Tol);
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Assert.InRange(center.Y, -Tol, Tol);
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}
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[Fact]
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public void IntersectNormals_ParallelNormals_ReturnsInvalid()
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{
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var p1 = new Vector(0, 0);
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var n1 = new Vector(1, 0);
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var p2 = new Vector(0, 5);
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var n2 = new Vector(1, 0);
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var center = EllipseConverter.IntersectNormals(p1, n1, p2, n2);
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Assert.False(center.IsValid());
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}
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}
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