BoundingCircle.cs

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namespace Engine {
    public struct BoundingCircle : IEquatable<BoundingCircle> {
        public Vector2 Center;
 
        public float Radius;
 
        public BoundingCircle(Vector2 center, float radius) {
            Center = center;
            Radius = radius;
        }
 
        public override bool Equals(object obj) => obj is BoundingCircle circle && Equals(circle);
 
        public override int GetHashCode() => Center.GetHashCode() + Radius.GetHashCode();
 
        public bool Equals(BoundingCircle other) => Center == other.Center && Radius == other.Radius;
 
        public override string ToString() => $"{Center},{Radius}";
 
        public bool Contains(Vector2 p) => Vector2.DistanceSquared(Center, p) <= Radius * Radius;
 
        public static bool operator ==(BoundingCircle c1, BoundingCircle c2) => c1.Equals(c2);
 
        public static bool operator !=(BoundingCircle c1, BoundingCircle c2) => !c1.Equals(c2);
    }
}