Syntriax.Engine/Engine.Physics2D/Primitives/Projection.cs

namespace Syntriax.Engine.Physics2D.Primitives;

[System.Diagnostics.DebuggerDisplay("Min: {Min}, Max: {Max}")]
public readonly struct Projection(float Min, float Max)
{
    public readonly float Min { get; init; } = Min;
    public readonly float Max { get; init; } = Max;

    public static bool Overlaps(Projection left, Projection right) => Overlaps(left, right, out var _);
    public static bool Overlaps(Projection left, Projection right, out float depth)
    {
        // TODO Try to improve this
        bool rightMinInLeft = right.Min > left.Min && right.Min < left.Max;
        if (rightMinInLeft)
        {
            depth = left.Max - right.Min;
            return true;
        }

        bool rightMaxInLeft = right.Max < left.Max && right.Max > left.Min;
        if (rightMaxInLeft)
        {
            depth = left.Min - right.Max;
            return true;
        }

        bool leftMinInRight = left.Min > right.Min && left.Min < right.Max;
        if (leftMinInRight)
        {
            depth = right.Max - left.Min;
            return true;
        }

        bool leftMaxInRight = left.Max < right.Max && left.Max > right.Min;
        if (leftMaxInRight)
        {
            depth = right.Min - left.Max;
            return true;
        }

        depth = 0f;
        return false;
    }
}
public static class ProjectionExtensions
{
    public static bool Overlaps(this Projection left, Projection right) => Projection.Overlaps(left, right);
    public static bool Overlaps(this Projection left, Projection right, out float depth) => Projection.Overlaps(left, right, out depth);
}