require 'enumerator'

class Area
	attr_reader :width, :height

	def initialize(width, height)
		@width  = width
		@height = height
		@slots  = "0"*(@width*@height)
	end

	def slot(x,y)
		(x-1)+(y-1)*@width # x+y*@width if you want 0,0 to be topleft instead of 1,1
	end

	def coordinates(slot)
		y,x = *slot.divmod(@width)
		return x+1, y+1
	end

	def occupy(x,y)
		@slots[slot(x,y)] = ?X
	end

	def unoccupy(x,y)
		@slots[slot(x,y)] = ?0
	end

	def occupied?(x,y) # prefixes like 'is_' suck ;-)
		@slots[slot(x,y)] == ?0
	end

	def to_s
		#(0...@height).map { |i| @slots[i*@width, @width] }.join("\n")
		@slots.gsub(/.{#{@width}}/, "\\\&\n")
	end
end

a = Area.new(10,10)
a.occupy(9,2)
puts a