public virtual Rectangle GetAttackArea(Direction direction, int radius) {
			  var area = new Rectangle(game.PlayerLocation, new Size(radius, radius));
			  // center
			  area.Left -= radius / 2;
			  area.Top -= radius / 2;

			  // extend
			  switch (direction) {
				  case Direction.Up:    area.Top -= radius;    area.Height += radius; break;
				  case Direction.Left:  area.Left -= radius;   area.Width += radius;  break;
				  case Direction.Down:  area.Bottom += radius; area.Height += radius; break;
				  case Direction.Right: area.Right += radius;  area.Width += radius;  break;
			  }
			  return area;
		  }