public int getAdjacentColumn(int rotation, int column) {
		switch(rotation) {
			case Hex.UP_RIGHT:
			case Hex.DOWN_LEFT:
				return column;
			case Hex.UP_LEFT:
			case Hex.LEFT:
				return column - 1;
			case Hex.DOWN_RIGHT:
			case Hex.RIGHT:
				return column + 1;
			default:
				return -1;
		}
	}