Custom Camera - SFML.NET

 public class Camera
    {

        internal int ParentScene;

        public Vector2f SizeTop = new Vector2f(0, 0);
        public Vector2f SizeBottom = new Vector2f(0, 0);
        public Vector2f Offset = new Vector2f(0, 0);

        public bool Enabled = true;

        public Camera()
        {
            ParentScene = Game.Instance.CurrentScene;
        }

        public void Move(float x, float y)
        {
            Offset.X += x;
            Offset.Y += y;
        }

        internal bool IsIn(Vector2f sef)
        {
            if (mathf.TestRange(sef.X, SizeBottom.X, SizeTop.X) &&
                mathf.TestRange(sef.Y, SizeTop.Y, SizeBottom.Y))
            {
                return true;
            }
            return false;
        }

    }