83 lines
3.2 KiB
C#
83 lines
3.2 KiB
C#
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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 class to compare two Vector2 objects for
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/// equality with NUnit constraints. Use the static
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/// <see cref="Vector2EqualityComparer.Instance"/>
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/// to have the calculation error value set to default 0.0001f.
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/// For any other error value, instantiate a new comparer
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/// object with the one argument constructor.
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/// </summary>
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public class Vector2EqualityComparer : IEqualityComparer<Vector2>
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{
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private const float k_DefaultError = 0.0001f;
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private readonly float AllowedError;
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private static readonly Vector2EqualityComparer m_Instance = new Vector2EqualityComparer();
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/// <summary>
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/// A comparer instance with the default error value set to 0.0001f.
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///</summary>
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public static Vector2EqualityComparer Instance { get { return m_Instance; } }
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private Vector2EqualityComparer() : this(k_DefaultError)
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{
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}
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/// <summary>
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/// Initializes an instance of Vector2Equality comparer with custom allowed calculation error.
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/// </summary>
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/// <param name="error">This value identifies the calculation error allowed.</param>
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public Vector2EqualityComparer(float error)
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{
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this.AllowedError = error;
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}
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/// <summary>
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/// Compares the actual and expected Vector2 objects for equality using the <see cref="Utils.AreFloatsEqual"/> method.
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/// </summary>
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/// <param name="expected">The expected Vector2 used for comparison</param>
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/// <param name="actual">The actual Vector2 to test</param>
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/// <returns>True if the vectors are equals, false otherwise.</returns>
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/// <example>
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/// The following example shows how to verify if two Vector2 are equals
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///<code>
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///[TestFixture]
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/// public class Vector2Test
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/// {
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/// [Test]
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/// public void VerifyThat_TwoVector2ObjectsAreEqual()
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/// {
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/// // Custom calculation error
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/// var actual = new Vector2(10e-7f, 10e-7f);
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/// var expected = new Vector2(0f, 0f);
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/// var comparer = new Vector2EqualityComparer(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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/// //Default error 0.0001f
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/// actual = new Vector2(0.01f, 0.01f);
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/// expected = new Vector2(0.01f, 0.01f);
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///
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/// Assert.That(actual, Is.EqualTo(expected).Using(Vector2EqualityComparer.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(Vector2 expected, Vector2 actual)
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{
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return Utils.AreFloatsEqual(expected.x, actual.x, AllowedError) &&
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Utils.AreFloatsEqual(expected.y, actual.y, 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="vec2">A not null Vector2</param>
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/// <returns>Returns 0</returns>
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public int GetHashCode(Vector2 vec2)
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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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