Objected-oriented Programming, Part 1

I am working on my first text-adventure game as part of Exercise 43 of Learn Ruby the Hard Way.  I have defined a simple class called Scene:

class Scene
  def enter()
    puts "This scene is not yet configured. Subclass it and implement enter()."
    exit(1)
  end
end

In other words, the only thing that "Scenes" have in common is that the player "enters" them.  What she does and whither she goes thereafter has to be defined. 

Within the game there are broadly speaking two kinds of scenes:

1. Scenes outside the house
2. Scenes inside the house

Scenes Outside the House

 

The very limited movements afforded at the start of the game serve to illustrate the point that not a lot of thought went into (or had to go into) defining how you navigate the first part of the map. 

 
Meadow => River
Meadow => Front door

River => Front door 
Front door => riddle => Ground floor of the house.

Scenes Inside the House

This is where things get tricky.  All the rooms in the house are connected by a staircase, which means that when you leave one room, you have access to all the others by means of the staircase.

At first I defined the method for getting up the stairs from the ground floor entrance composed of the following elements:

• Text for the player
• Declared value for floorNumber
• While loop
• Case conditional that calls the engine.

def enter()

"""
    You are at a spiral staircase.  There is a sign on the landing:

    0. Ground Floor: Entrance to the castle

    1. First Floor: Machine room

    2. Second Floor: Kitchen

    3. Third Floor: Library

    4. Fourth Floor: Royal Bedroom

    5. Penthouse: Study

    6. Exit the castle and go back to the meadow.

    Where would you like to go to?

    """
    currentFloor = 0
    while currentFloor == 0
      print "> "

      floorSelection = $stdin.gets.chomp.downcase()

      case floorSelection
      when /0/, /ground/, /entrance/
        if currentFloor == 0
          puts "You are already here.  Try another floor."
        elsif currentFloor != 0
          puts "You descend the stairs to the ground floor."
          return 'spiral_staircase'
        else
          puts "Something has clearly gone wrong."
        end
      when /1/, /first/, /machine/
        if currentFloor < 1
          puts "You ascend the stairs to the machine room."
          currentFloor == 1
          return 'machine_room'
        elsif currentFloor > 1
          puts "You descend the stairs to the machine room."
          currentFloor == 1
          return 'machine_room'
        elsif currentFloor == 1
        puts "You are already here.  Try another floor."
        else
          puts "There has clearly been a mistake somewhere."
        end
      when /2/, /second/, /kitchen/
        if currentFloor < 2
          puts "You ascend the stairs to the kitchen."
          currentFloor == 2
          return 'kitchen'
        elsif currentFloor > 2
          puts "You descend the stairs to the kitchen."
          currentFloor == 2
          return 'kitchen'
        elsif currentFloor == 2
        puts "You are already here.  Try another floor."
        else
          puts "There has clearly been a mistake somewhere."
        end
      when /3/, /third/, /library/
        if currentFloor < 3
          puts "You ascend the stairs to the library."
          currentFloor == 3
          return 'library'
        elsif currentFloor > 3
          puts "You descend the stairs to the library."
          currentFloor == 3
          return 'library'
        elsif currentFloor == 3
        puts "You are already here.  Try another floor."
        else
          puts "There has clearly been a mistake somewhere."
        end
      when /4/, /fourth/, /bedroom/
        if currentFloor < 4
          puts "You ascend the stairs to the bedroom."
          currentFloor == 4
          return 'bedroom'
        elsif currentFloor > 4
          puts "You descend the stairs to the bedroom."
          currentFloor == 4
          return 'bedroom'
        elsif currentFloor == 4
        puts "You are already here.  Try another floor."
        else
          puts "There has clearly been a mistake somewhere."
        end
      when /5/, /fifth/, /study/, /penthouse/
        if currentFloor < 5
          puts "You ascend the stairs to the study."
          currentFloor == 5
          return 'study'
        elsif currentFloor > 5
          puts "You descend the stairs to the study."
          currentFloor == 5
          return 'study'
        elsif currentFloor == 5
        puts "You are already here.  Try another floor."
        else
          puts "There has clearly been a mistake somewhere."
        end
      when /6/, /leave/, /exit/, /back/, /meadow/
        if currentFloor != 0
          puts WordWrap.ww "You descend the stairs, walk out the door, and keep going until the you reach the edge of the meadow."
          currentFloor == 0
          return 'meadow'
        elsif currentFloor == 0
          puts "You walk out the door, and keep going until the you reach the edge of the meadow."
          return 'meadow'
        else
          puts "There has clearly been a mistake somewhere."
        end
      else
        puts "I don't understand your request"
      end

    end
end

• All 'Scenes' use the enter() function.
• All the rooms are 'Scenes'.
• All the rooms are 'Scenes' that require the same function for selecting a floor.
• Ergo, all the rooms are 'Scenes' use a function that could be defined as 'selectFloor()'.
• However, every room is located on a particular floor, which changes whether the player goes up or down the stairs, or is already at that floor.
• Ergo, every 'House Scene' needs to inherit the function 'selectFloor()' but with a variable for its floor, i.e. 'selectFloor(floorNumber)'