Dashboard/Dashboard.Common/Box2d.cs

using System.ComponentModel.DataAnnotations;
using System.Drawing;
using System.Numerics;

namespace Dashboard
{
    public readonly record struct Box2d(Vector2 Min, Vector2 Max)
    {
        public float Left => Min.X;
        public float Right => Max.X;
        public float Top => Min.Y;
        public float Bottom => Max.Y;

        public Vector2 Size => Max - Min;
        public Vector2 Center => (Min + Max) * 0.5f;

        public Box2d(RectangleF rectangle)
            : this(new Vector2(rectangle.Left, rectangle.Top), new Vector2(rectangle.Right, rectangle.Bottom))
        {
        }

        public Box2d(float x0, float y0, float x1, float y1)
            : this(new Vector2(x0, y0), new Vector2(x1, y1))
        {
        }

        public static Box2d FromPositionAndSize(Vector2 position, Vector2 size, Origin anchor = Origin.Center)
        {
            Vector2 half = size * 0.5f;
            switch (anchor)
            {
                case Origin.Center:
                    return new Box2d(position - half, position + half);
                case Origin.TopLeft:
                    return new Box2d(position, position + size);
                default:
                    throw new NotImplementedException();
            }
        }

        public static Box2d Union(Box2d left, Box2d right)
        {
            Vector2 min = Vector2.Min(left.Min, right.Min);
            Vector2 max = Vector2.Max(left.Max, right.Max);
            return new Box2d(min, max);
        }

        public static Box2d Intersect(Box2d left, Box2d right)
        {
            Vector2 min = Vector2.Max(left.Min, right.Min);
            Vector2 max = Vector2.Min(left.Max, right.Max);
            return new Box2d(min, max);
        }

        public static explicit operator RectangleF(Box2d box2d)
        {
            return new RectangleF((PointF)box2d.Center, (SizeF)box2d.Size);
        }

        public static explicit operator Box2d(RectangleF rectangle)
        {
            return new Box2d(rectangle);
        }
    }
}