Methods for converting between direction vectors and cardinal direction values in Godot C#

CardinalDirections.cs

using Godot;

#pragma warning disable CA1050

/// <summary>
/// Cardinal directions, ordered clockwise from East
/// </summary>
public enum CardinalDirection
{
    Unknown = -1,

    E,  // East 
    SE, // Southeast
    S,  // South
    SW, // Southwest
    W,  // West
    NW, // Northwest
    N,  // North
    NE, // Northeast
}

/// <summary>
/// Extension methods for converting between <see cref="Vector2"/> direction vectors and <see cref="CardinalDirection"/> values
/// </summary>
public static class Vector2DirectionExtensions
{
    /// <summary>
    /// Direction vectors corresponding to the <see cref="CardinalDirection"/> enum values
    /// </summary>
    private static Vector2[] _directionVectors =
    [
        Vector2.Right,
        new Vector2( 0.70710677f, 0.70710677f ),
        Vector2.Down,
        new Vector2( -0.70710677f, 0.70710677f ),
        Vector2.Left,
        new Vector2( -0.70710677f, -0.70710677f ),
        Vector2.Up,
        new Vector2( 0.70710677f, -0.70710677f )
    ];

    /// <summary>
    /// Converts a <see cref="CardinalDirection"/> value to the corresponding normalized direction vector
    /// </summary>
    /// <param name="direction">The <see cref="CardinalDirection"/> value to convert</param>
    /// <returns>Returns the corresponding direction vector</returns>
    public static Vector2 ToDirectionVector( this CardinalDirection direction )
    {
        return _directionVectors[ (int)direction ];
    }

    /// <summary>
    /// Converts a normalized direction vector to the closest <see cref="CardinalDirection"/> value
    /// </summary>
    /// <param name="directionVector">A normalized 2D direction vector</param>
    /// <returns>Returns the nearest <see cref="CardinalDirection"/> value that represents the direction vector</returns>
    public static CardinalDirection ToCardinalDirection( this Vector2 directionVector )
    {
        var angle  = Mathf.Atan2( directionVector.Y, directionVector.X );
        var octant = (int)Mathf.Round( 8 * angle / Mathf.Tau + 8 ) % 8;
        return (CardinalDirection)octant;
    }
}