114 lines
5.2 KiB
C#
114 lines
5.2 KiB
C#
using System;
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using System.Collections.Generic;
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namespace Engine.Core;
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/// <summary>
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/// Represents an Axis-Aligned Bounding Box (AABB) in 3D space.
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/// </summary>
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/// <param name="lowerBoundary">The lower boundary of the <see cref="AABB3D"/>.</param>
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/// <param name="upperBoundary">The upper boundary of the <see cref="AABB3D"/>.</param>
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/// <remarks>
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/// Initializes a new instance of the <see cref="AABB3D"/> struct with the specified lower and upper boundaries.
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/// </remarks>
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[System.Diagnostics.DebuggerDisplay("LowerBoundary: {LowerBoundary.ToString(), nq}, UpperBoundary: {UpperBoundary.ToString(), nq}")]
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public readonly struct AABB3D(Vector3D lowerBoundary, Vector3D upperBoundary) : IEquatable<AABB3D>
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{
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/// <summary>
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/// The lower boundary of the <see cref="AABB3D"/>.
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/// </summary>
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public readonly Vector3D LowerBoundary = lowerBoundary;
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/// <summary>
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/// The upper boundary of the <see cref="AABB3D"/>.
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/// </summary>
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public readonly Vector3D UpperBoundary = upperBoundary;
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/// <summary>
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/// Gets the center point of the <see cref="AABB3D"/>.
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/// </summary>
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public readonly Vector3D Center => (LowerBoundary + UpperBoundary) * .5f;
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/// <summary>
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/// Gets the size of the <see cref="AABB3D"/>.
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/// </summary>
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public readonly Vector3D Size => LowerBoundary.FromTo(UpperBoundary).Abs();
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/// <summary>
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/// Gets half the size of the <see cref="AABB3D"/>.
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/// </summary>
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public readonly Vector3D SizeHalf => Size * .5f;
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public static bool operator ==(AABB3D left, AABB3D right) => left.UpperBoundary == right.UpperBoundary && left.LowerBoundary == right.LowerBoundary;
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public static bool operator !=(AABB3D left, AABB3D right) => left.UpperBoundary != right.UpperBoundary || left.LowerBoundary != right.LowerBoundary;
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public static implicit operator AABB3D(Sphere3D sphere) => new(sphere.Center - new Vector3D(sphere.Radius, sphere.Radius, sphere.Radius), sphere.Center + new Vector3D(sphere.Radius, sphere.Radius, sphere.Radius));
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/// <summary>
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/// Creates an <see cref="AABB3D"/> from a collection of <see cref="Vector3D"/>s.
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/// </summary>
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/// <param name="vectors">The collection of <see cref="Vector3D"/>s.</param>
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/// <returns>An <see cref="AABB3D"/> that bounds all the <see cref="Vector3D"/>s.</returns>
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public static AABB3D FromVectors(IEnumerable<Vector3D> vectors)
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{
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int counter = 0;
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Vector3D lowerBoundary = new(float.MaxValue, float.MaxValue, float.MaxValue);
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Vector3D upperBoundary = new(float.MinValue, float.MinValue, float.MinValue);
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foreach (Vector3D vector in vectors)
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{
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lowerBoundary = Vector3D.Min(lowerBoundary, vector);
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upperBoundary = Vector3D.Max(upperBoundary, vector);
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counter++;
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}
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if (counter < 2)
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throw new ArgumentException($"Parameter {nameof(vectors)} must have at least 2 items.");
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return new(lowerBoundary, upperBoundary);
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}
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/// <summary>
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/// Checks if two <see cref="AABB3D"/>s are approximately equal.
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/// </summary>
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/// <param name="left">The first <see cref="AABB3D"/>.</param>
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/// <param name="right">The second <see cref="AABB3D"/>.</param>
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/// <param name="epsilon">The epsilon range.</param>
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/// <returns><see cref="true"/> if the <see cref="AABB3D"/>s are approximately equal; otherwise, <see cref="false"/>.</returns>
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public static bool ApproximatelyEquals(AABB3D left, AABB3D right, float epsilon = float.Epsilon)
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=> left.LowerBoundary.ApproximatelyEquals(right.LowerBoundary, epsilon) && left.UpperBoundary.ApproximatelyEquals(right.UpperBoundary, epsilon);
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/// <summary>
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/// Determines whether the specified object is equal to the current <see cref="AABB3D"/>.
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/// </summary>
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/// <param name="obj">The object to compare with the current <see cref="AABB3D"/>.</param>
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/// <returns><see cref="true"/> if the specified object is equal to the current <see cref="AABB3D"/>; otherwise, <see cref="false"/>.</returns>
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public override bool Equals(object? obj) => obj is AABB3D aabb && this == aabb;
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public bool Equals(AABB3D other) => this == other;
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/// <summary>
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/// Generates a hash code for the <see cref="AABB3D"/>.
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/// </summary>
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/// <returns>A hash code for the <see cref="AABB3D"/>.</returns>
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public override int GetHashCode() => System.HashCode.Combine(LowerBoundary, UpperBoundary);
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/// <summary>
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/// Converts the <see cref="AABB3D"/> to its string representation.
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/// </summary>
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/// <returns>A string representation of the <see cref="AABB3D"/>.</returns>
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public override string ToString() => $"{nameof(AABB3D)}({LowerBoundary}, {UpperBoundary})";
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}
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/// <summary>
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/// Provides extension methods for the <see cref="AABB3D"/> struct.
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/// </summary>
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public static class AABB3DExtensions
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{
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/// <inheritdoc cref="AABB3D.FromVectors" />
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public static AABB3D ToAABB3D(this IEnumerable<Vector3D> vectors) => AABB3D.FromVectors(vectors);
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/// <inheritdoc cref="AABB3D.ApproximatelyEquals" />
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public static bool ApproximatelyEquals(this AABB3D left, AABB3D right, float epsilon = float.Epsilon) => AABB3D.ApproximatelyEquals(left, right, epsilon);
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}
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