using System.Collections.Generic;
namespace UnityEngine.TestTools.Utils
{
///
/// Use this class to compare two Vector3 objects for equality with NUnit constraints. Call Vector3EqualityComparer.Instance comparer to perform a comparison with the default calculation error value 0.0001f. To specify a different error value, use the one argument constructor to instantiate a new comparer.
///
public class Vector3EqualityComparer : IEqualityComparer
{
private const float k_DefaultError = 0.0001f;
private readonly float AllowedError;
private static readonly Vector3EqualityComparer m_Instance = new Vector3EqualityComparer();
///
/// A comparer instance with the default calculation error value equal to 0.0001f.
///
public static Vector3EqualityComparer Instance { get { return m_Instance; } }
private Vector3EqualityComparer() : this(k_DefaultError) {}
///
/// Initializes an instance of Vector3Equality comparer with custom allowed calculation error.
///
/// This value identifies the calculation error allowed.
public Vector3EqualityComparer(float allowedError)
{
this.AllowedError = allowedError;
}
///
/// Compares the actual and expected Vector3 objects
/// for equality using to compare the x, y, and z attributes of Vector3.
///
/// The expected Vector3 used for comparison
/// The actual Vector3 to test
/// True if the vectors are equals, false otherwise.
///
/// The following example shows how to verify if two Vector3 are equals
///
/// [TestFixture]
/// public class Vector3Test
/// {
/// [Test]
/// public void VerifyThat_TwoVector3ObjectsAreEqual()
/// {
/// //Custom error 10e-6f
/// var actual = new Vector3(10e-8f, 10e-8f, 10e-8f);
/// var expected = new Vector3(0f, 0f, 0f);
/// var comparer = new Vector3EqualityComparer(10e-6f);
///
///
/// Assert.That(actual, Is.EqualTo(expected).Using(comparer));
///
/// //Default error 0.0001f
/// actual = new Vector3(0.01f, 0.01f, 0f);
/// expected = new Vector3(0.01f, 0.01f, 0f);
///
/// Assert.That(actual, Is.EqualTo(expected).Using(Vector3EqualityComparer.Instance));
/// }
/// }
///
///
public bool Equals(Vector3 expected, Vector3 actual)
{
return Utils.AreFloatsEqual(expected.x, actual.x, AllowedError) &&
Utils.AreFloatsEqual(expected.y, actual.y, AllowedError) &&
Utils.AreFloatsEqual(expected.z, actual.z, AllowedError);
}
///
/// Serves as the default hash function.
///
/// A not null Vector3
/// Returns 0
public int GetHashCode(Vector3 vec3)
{
return 0;
}
}
}