82 lines
3.2 KiB
C#
82 lines
3.2 KiB
C#
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using System;
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using System.Collections.Generic;
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namespace UnityEngine.TestTools.Utils
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{
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/// <summary>
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/// Use this utility to compare two Quaternion objects for equality
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/// with NUnit assertion constraints.
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/// Use the static instance QuaternionEqualityComparer.Instance
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/// to have the default calculation error value set to 0.00001f.
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/// For any other custom error value, use the one argument constructor.
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/// </summary>
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public class QuaternionEqualityComparer : IEqualityComparer<Quaternion>
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{
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private const float k_DefaultError = 0.00001f;
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private readonly float AllowedError;
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private static readonly QuaternionEqualityComparer m_Instance = new QuaternionEqualityComparer();
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/// <summary>
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///A comparer instance with the default error value 0.00001f.
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/// </summary>
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public static QuaternionEqualityComparer Instance { get { return m_Instance; } }
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private QuaternionEqualityComparer() : this(k_DefaultError) {}
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/// <summary>
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/// Creates an instance of the comparer with a custom allowed error value.
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/// </summary>
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/// <param name="allowedError">Describes the custom allowed error value</param>
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public QuaternionEqualityComparer(float allowedError)
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{
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AllowedError = allowedError;
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}
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/// <summary>
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/// Compares the actual and expected Quaternion objects
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/// for equality using the <see cref="Quaternion.Dot "/> method.
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/// </summary>
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/// <param name="expected">Expected Quaternion value used for comparison</param>
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/// <param name="actual">Actual Quaternion value to test</param>
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/// <returns>True if the quaternion are equals, false otherwise.</returns>
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/// <example>
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/// <para>The following example shows how to verify if two Quaternion are equals</para>
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/// <code>
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/// [TestFixture]
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/// public class QuaternionTest
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/// {
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/// [Test]
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/// public void VerifyThat_TwoQuaternionsAreEqual()
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/// {
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/// var actual = new Quaternion(10f, 0f, 0f, 0f);
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/// var expected = new Quaternion(1f, 10f, 0f, 0f);
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/// var comparer = new QuaternionEqualityComparer(10e-6f);
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///
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/// Assert.That(actual, Is.EqualTo(expected).Using(comparer));
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///
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/// //Using default error 0.00001f
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/// actual = new Quaternion(10f, 0f, 0.1f, 0f);
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/// expected = new Quaternion(1f, 10f, 0.1f, 0f);
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///
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/// Assert.That(actual, Is.EqualTo(expected).Using(QuaternionEqualityComparer.Instance));
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/// }
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/// }
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/// </code>
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/// </example>
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public bool Equals(Quaternion expected, Quaternion actual)
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{
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return Mathf.Abs(Quaternion.Dot(expected, actual)) > (1.0f - AllowedError);
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}
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/// <summary>
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/// Serves as the default hash function.
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/// </summary>
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/// <param name="quaternion">A not null Quaternion</param>
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/// <returns>Returns 0</returns>
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public int GetHashCode(Quaternion quaternion)
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{
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return 0;
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}
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}
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}
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