HellionChat/HellionChat/Util/MathUtil.cs

using System.Numerics;

namespace HellionChat.Util;

public static class MathUtil
{
    public record Rectangle
    {
        public int X;
        public int Y;
        public int Width;
        public int Height;

        public int SizeX;
        public int SizeY;

        public Rectangle(int x, int y, int width, int height)
        {
            X = x;
            Y = y;
            Width = width;
            Height = height;

            SizeX = X + Width;
            SizeY = Y + Height;
        }

        public Rectangle(Vector2 pos, Vector2 size)
            : this((int)pos.X, (int)pos.Y, (int)size.X, (int)size.Y) { }

        public override string ToString() => $"X: {X} Y: {Y} Width: {Width} Height: {Height}";
    }

    // Standard AABB overlap test. Inclusive on both axes to catch shared
    // edges and identical rectangles (previous ValueInRange approach missed these).
    public static bool HasOverlap(this Rectangle a, Rectangle b)
    {
        return a.X < b.X + b.Width
            && a.X + a.Width > b.X
            && a.Y < b.Y + b.Height
            && a.Y + a.Height > b.Y;
    }
}