/
V3Tests.cs
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/
V3Tests.cs
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using System;
using AssertExtensions;
using MechJebLib.Primitives;
using Xunit;
using static MechJebLib.Utils.Statics;
namespace MechJebLibTest.Structs
{
public class V3Tests
{
[Fact]
private void ComponentTests()
{
Assert.Equal(1.0, new V3(1, 2, 3).min_magnitude);
Assert.Equal(1.0, new V3(2, 1, 3).min_magnitude);
Assert.Equal(1.0, new V3(3, 2, 1).min_magnitude);
Assert.Equal(1.0, new V3(2, 3, 1).min_magnitude);
Assert.Equal(1.0, new V3(1, 3, 2).min_magnitude);
Assert.Equal(1.0, new V3(3, 1, 2).min_magnitude);
Assert.Equal(1.0, new V3(-1, -2, -3).min_magnitude);
Assert.Equal(1.0, new V3(-2, -1, -3).min_magnitude);
Assert.Equal(1.0, new V3(-3, -2, -1).min_magnitude);
Assert.Equal(1.0, new V3(-2, -3, -1).min_magnitude);
Assert.Equal(1.0, new V3(-1, -3, -2).min_magnitude);
Assert.Equal(1.0, new V3(-3, -1, -2).min_magnitude);
Assert.Equal(3.0, new V3(1, 2, 3).max_magnitude);
Assert.Equal(3.0, new V3(2, 1, 3).max_magnitude);
Assert.Equal(3.0, new V3(3, 2, 1).max_magnitude);
Assert.Equal(3.0, new V3(2, 3, 1).max_magnitude);
Assert.Equal(3.0, new V3(1, 3, 2).max_magnitude);
Assert.Equal(3.0, new V3(3, 1, 2).max_magnitude);
Assert.Equal(3.0, new V3(-1, -2, -3).max_magnitude);
Assert.Equal(3.0, new V3(-2, -1, -3).max_magnitude);
Assert.Equal(3.0, new V3(-3, -2, -1).max_magnitude);
Assert.Equal(3.0, new V3(-2, -3, -1).max_magnitude);
Assert.Equal(3.0, new V3(-1, -3, -2).max_magnitude);
Assert.Equal(3.0, new V3(-3, -1, -2).max_magnitude);
Assert.Equal(0, new V3(1, 2, 3).min_magnitude_index);
Assert.Equal(1, new V3(2, 1, 3).min_magnitude_index);
Assert.Equal(2, new V3(3, 2, 1).min_magnitude_index);
Assert.Equal(2, new V3(2, 3, 1).min_magnitude_index);
Assert.Equal(0, new V3(1, 3, 2).min_magnitude_index);
Assert.Equal(1, new V3(3, 1, 2).min_magnitude_index);
Assert.Equal(0, new V3(-1, -2, -3).min_magnitude_index);
Assert.Equal(1, new V3(-2, -1, -3).min_magnitude_index);
Assert.Equal(2, new V3(-3, -2, -1).min_magnitude_index);
Assert.Equal(2, new V3(-2, -3, -1).min_magnitude_index);
Assert.Equal(0, new V3(-1, -3, -2).min_magnitude_index);
Assert.Equal(1, new V3(-3, -1, -2).min_magnitude_index);
Assert.Equal(2, new V3(1, 2, 3).max_magnitude_index);
Assert.Equal(2, new V3(2, 1, 3).max_magnitude_index);
Assert.Equal(0, new V3(3, 2, 1).max_magnitude_index);
Assert.Equal(1, new V3(2, 3, 1).max_magnitude_index);
Assert.Equal(1, new V3(1, 3, 2).max_magnitude_index);
Assert.Equal(0, new V3(3, 1, 2).max_magnitude_index);
Assert.Equal(2, new V3(-1, -2, -3).max_magnitude_index);
Assert.Equal(2, new V3(-2, -1, -3).max_magnitude_index);
Assert.Equal(0, new V3(-3, -2, -1).max_magnitude_index);
Assert.Equal(1, new V3(-2, -3, -1).max_magnitude_index);
Assert.Equal(1, new V3(-1, -3, -2).max_magnitude_index);
Assert.Equal(0, new V3(-3, -1, -2).max_magnitude_index);
}
[Fact]
private void MagnitudeLargeTest()
{
double large = 1e+190;
var largeV = new V3(large, large, large);
Assert.Equal(Math.Sqrt(3) * large, largeV.magnitude);
}
[Fact]
private void MagnitudeSmallTest()
{
double small = 1e-190;
var smallV = new V3(small, small, small);
Assert.Equal(Math.Sqrt(3) * small, smallV.magnitude);
}
[Fact]
private void NormalizeLargeTest()
{
double large = 1e+190;
var largeV = new V3(large, large, large);
Assert.Equal(1.0 / Math.Sqrt(3), largeV.normalized[0]);
Assert.Equal(1.0 / Math.Sqrt(3), largeV.normalized[1]);
Assert.Equal(1.0 / Math.Sqrt(3), largeV.normalized[2]);
}
[Fact]
private void NormalizeSmallTest()
{
double small = 1e-190;
var smallV = new V3(small, small, small);
Assert.Equal(1.0 / Math.Sqrt(3), smallV.normalized[0]);
Assert.Equal(1.0 / Math.Sqrt(3), smallV.normalized[1]);
Assert.Equal(1.0 / Math.Sqrt(3), smallV.normalized[2]);
}
[Fact]
private void ZeroTests()
{
Assert.Equal(0, V3.zero.magnitude);
Assert.Equal(0, V3.zero.sqrMagnitude);
Assert.Equal(V3.zero, V3.zero.normalized);
}
[Fact]
private void RandomSphericalConversions()
{
const int NTRIALS = 5000;
var random = new Random();
for (int i = 0; i < NTRIALS; i++)
{
var v = new V3(40 * random.NextDouble() - 20, 40 * random.NextDouble() - 20, 40 * random.NextDouble() - 20);
v.cart2sph.sph2cart.ShouldEqual(v, 1e-13);
}
}
[Fact]
private void CartesianToSpherical()
{
new V3(1, 1, 1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(1 / Math.Sqrt(3)), PI / 4));
new V3(1, 1, -1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(-1 / Math.Sqrt(3)), PI / 4));
new V3(1, -1, 1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(1 / Math.Sqrt(3)), 7 * PI / 4));
new V3(1, -1, -1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(-1 / Math.Sqrt(3)), 7 * PI / 4));
new V3(-1, 1, 1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(1 / Math.Sqrt(3)), 3 * PI / 4));
new V3(-1, 1, -1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(-1 / Math.Sqrt(3)), 3 * PI / 4));
new V3(-1, -1, 1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(1 / Math.Sqrt(3)), 5 * PI / 4));
new V3(-1, -1, -1).cart2sph.ShouldEqual(new V3(Math.Sqrt(3), Math.Acos(-1 / Math.Sqrt(3)), 5 * PI / 4));
}
}
}