wehub-resource-sync
271 lines
12 KiB
C#
271 lines
12 KiB
C#
using T3.Core.Animation;
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using T3.Core.DataTypes;
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using Xunit;
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namespace Core.Tests;
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public class CurveInterpolationTests
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{
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[Fact]
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public void LinearToLinear_InterpolatesLinearly()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 0.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 1.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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Assert.Equal(0.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(0.25, curve.GetSampledValue(0.25), 4);
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Assert.Equal(0.5, curve.GetSampledValue(0.5), 4);
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Assert.Equal(0.75, curve.GetSampledValue(0.75), 4);
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Assert.Equal(1.0, curve.GetSampledValue(1.0), 4);
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}
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[Fact]
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public void LinearToLinear_NegativeSlope()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 10.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 0.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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Assert.Equal(10.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(5.0, curve.GetSampledValue(0.5), 4);
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Assert.Equal(0.0, curve.GetSampledValue(1.0), 4);
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}
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[Fact]
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public void CollinearSmoothKeys_FormStraightLine()
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{
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// Three points on y=x: [0,0] -> [0.5,0.5] -> [1,1]
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// With smooth interpolation, collinear points should produce a straight line
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 0.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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curve.AddOrUpdateV(0.5, new VDefinition
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{
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Value = 0.5,
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InInterpolation = VDefinition.KeyInterpolation.Smooth,
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OutInterpolation = VDefinition.KeyInterpolation.Smooth,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 1.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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// Sample at multiple points — should all lie on y=x
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Assert.Equal(0.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(0.125, curve.GetSampledValue(0.125), 4);
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Assert.Equal(0.25, curve.GetSampledValue(0.25), 4);
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Assert.Equal(0.5, curve.GetSampledValue(0.5), 4);
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Assert.Equal(0.75, curve.GetSampledValue(0.75), 4);
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Assert.Equal(0.875, curve.GetSampledValue(0.875), 4);
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Assert.Equal(1.0, curve.GetSampledValue(1.0), 4);
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}
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[Fact]
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public void ConstantToConstant_HoldsFirstValue()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 3.0,
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InInterpolation = VDefinition.KeyInterpolation.Constant,
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OutInterpolation = VDefinition.KeyInterpolation.Constant,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 7.0,
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InInterpolation = VDefinition.KeyInterpolation.Constant,
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OutInterpolation = VDefinition.KeyInterpolation.Constant,
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});
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// Should hold 3.0 for everything before the second key
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Assert.Equal(3.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(3.0, curve.GetSampledValue(0.25), 4);
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Assert.Equal(3.0, curve.GetSampledValue(0.5), 4);
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Assert.Equal(3.0, curve.GetSampledValue(0.999), 4);
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// At exactly the second key, should snap to 7.0
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Assert.Equal(7.0, curve.GetSampledValue(1.0), 4);
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}
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[Fact]
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public void ConstantToConstant_MultipleKeys()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 1.0,
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InInterpolation = VDefinition.KeyInterpolation.Constant,
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OutInterpolation = VDefinition.KeyInterpolation.Constant,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 5.0,
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InInterpolation = VDefinition.KeyInterpolation.Constant,
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OutInterpolation = VDefinition.KeyInterpolation.Constant,
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});
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curve.AddOrUpdateV(2.0, new VDefinition
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{
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Value = 9.0,
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InInterpolation = VDefinition.KeyInterpolation.Constant,
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OutInterpolation = VDefinition.KeyInterpolation.Constant,
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});
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Assert.Equal(1.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(1.0, curve.GetSampledValue(0.5), 4);
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Assert.Equal(5.0, curve.GetSampledValue(1.0), 4);
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Assert.Equal(5.0, curve.GetSampledValue(1.5), 4);
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Assert.Equal(9.0, curve.GetSampledValue(2.0), 4);
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}
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[Fact]
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public void BeforeFirstKey_ReturnsFirstValue()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 42.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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Assert.Equal(42.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(42.0, curve.GetSampledValue(-10.0), 4);
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}
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[Fact]
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public void AfterLastKey_ReturnsLastValue()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 3.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 7.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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Assert.Equal(7.0, curve.GetSampledValue(2.0), 4);
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Assert.Equal(7.0, curve.GetSampledValue(100.0), 4);
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}
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[Fact]
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public void SingleKey_ReturnsThatValueEverywhere()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(5.0, new VDefinition
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{
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Value = 42.0,
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InInterpolation = VDefinition.KeyInterpolation.Smooth,
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OutInterpolation = VDefinition.KeyInterpolation.Smooth,
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});
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Assert.Equal(42.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(42.0, curve.GetSampledValue(5.0), 4);
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Assert.Equal(42.0, curve.GetSampledValue(10.0), 4);
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}
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[Fact]
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public void EmptyCurve_ReturnsZero()
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{
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var curve = new Curve();
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Assert.Equal(0.0, curve.GetSampledValue(0.0));
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Assert.Equal(0.0, curve.GetSampledValue(1.0));
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}
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[Fact]
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public void EqualEndpoints_WithUpwardTangents_ProducesOvershoot()
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{
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// Two keys at same value with tangents both pointing upward —
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// spline interpolation should overshoot above 5.0 (intentional behavior).
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 5.0,
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InInterpolation = VDefinition.KeyInterpolation.Tangent,
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OutInterpolation = VDefinition.KeyInterpolation.Tangent,
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InTangentAngle = 0.0,
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OutTangentAngle = 0.7854, // ~45 degrees up
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 5.0,
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InInterpolation = VDefinition.KeyInterpolation.Tangent,
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OutInterpolation = VDefinition.KeyInterpolation.Tangent,
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InTangentAngle = Math.PI - 0.7854, // ~135 degrees = coming from above
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OutTangentAngle = 0.0,
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});
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// Endpoints must be exactly 5.0
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Assert.Equal(5.0, curve.GetSampledValue(0.0), 4);
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Assert.Equal(5.0, curve.GetSampledValue(1.0), 4);
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// Midpoint should be above 5.0 due to both tangents pushing upward
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var mid = curve.GetSampledValue(0.5);
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Assert.True(mid > 5.1, $"Expected overshoot above 5.0, got {mid}");
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}
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[Fact]
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public void MixedInterpolation_ConstantThenLinear()
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{
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var curve = new Curve();
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curve.AddOrUpdateV(0.0, new VDefinition
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{
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Value = 1.0,
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InInterpolation = VDefinition.KeyInterpolation.Constant,
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OutInterpolation = VDefinition.KeyInterpolation.Constant,
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});
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curve.AddOrUpdateV(1.0, new VDefinition
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{
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Value = 3.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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curve.AddOrUpdateV(2.0, new VDefinition
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{
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Value = 5.0,
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InInterpolation = VDefinition.KeyInterpolation.Linear,
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OutInterpolation = VDefinition.KeyInterpolation.Linear,
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});
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// First segment: constant hold
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Assert.Equal(1.0, curve.GetSampledValue(0.5), 4);
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// At key 1: snap to 3.0
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Assert.Equal(3.0, curve.GetSampledValue(1.0), 4);
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// Second segment: linear 3→5
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Assert.Equal(4.0, curve.GetSampledValue(1.5), 4);
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Assert.Equal(5.0, curve.GetSampledValue(2.0), 4);
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}
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}
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