ff.rb

class World < Chingu::GameObject
  attr_reader :grid, :width, :height, :walls
  
  def initialize(options)
    super
    @width = 20
    @height = 20
    @grid = Array.new(width,[])
    @grid = @grid.map {Array.new(height,0)}
    
    #@target_sprite = Image["grass.bmp"]
    #@wall_sprite = Image["wall.bmp"]
    
    @walls = []
  end
  
  def update
  end
  
  def draw
    @grid.each_with_index do |inner, x|
      inner.each_index do |y|
        @target_sprite.draw(x*24,y*24,0)
      end
    end
    
    @walls.each do |pos|
			@wall_sprite.draw(24*pos[0], 24*pos[1], 2)
		end
  end
  
  def handle_wall_click(x, y)
		x = (x/24).floor
    y = (y/24).floor
		if @walls.include?([x,y])
			@walls.delete([x,y])
		elsif
			@walls << [x,y]
		end
	end
  
end

main.rb

require 'gosu'
require 'chingu'

require_relative 'player'
require_relative 'world'
require_relative 'enemy'
require_relative 'pathfinder'

class Game < Gosu::Window
	attr_reader :world
	
  def initialize
    super 480, 480, false
    self.caption = "Dan's Shit Game For Idiots: Dubstep Protocol"
    @world = World.create(:x=>2)