// Outputters are never open tiles.
        public Outputter(Vector2 position, Directions direction, LaserColours colour)
            : base(position, false)
        {
            OutputDirection = direction;
            OutputColour = colour;

            TileSprite = new Sprite(Assets.Level.Images.Outputter);
            TileSprite.CenterOn(Center);
            TileSprite.Rotation = Math.Atan2(OutputDirection.Y, OutputDirection.X);
            TileSprite.Tint = OutputColour.Color * 3f;
        }
        // Receivers are never open tiles.
        public Receiver(Vector2 position, Directions direction, LaserColours colour)
            : base(position, false)
        {
            InputDirection = direction;
            InputColour = colour;

            TileSprite = new Sprite(Assets.Level.Images.Receiver);
            TileSprite.CenterOn(Center);
            TileSprite.Rotation = Math.Atan2(InputDirection.Y, -InputDirection.X);
            TileSprite.Tint = InputColour.Color * 3f;
        }