amidakuji

gistfile1.rb

class Kuji
  attr_accessor :bars
  def initialize(num, length = nil)
    @num = num
    length = 4 if length.nil?
    @bars = Array.new(length) { |index| Array.new(num - 1, false) }
  end

  def generate
    @bars.each do |bar|
      bar.each_with_index do |b, idx|
        if can_bar?(bar,idx)
          bar[idx] = (rand(2) == 0)
        else
          bar[idx] = false
        end
      end
    end
  end

  def can_bar?(b, idx)
    if idx == 0
      true
    elsif b[idx-1]
      false
    else
      true
    end
  end
  private :can_bar?

  def output
    result = Array.new
    result.push (0...@num).to_a.map{|m| m.to_s}.join(' ')
    @bars.each do |bar|
      result.push '|' + bar.map {|b| b ? "-" : " " }.join('|') + '|'
    end
    result.push '!'
    result.join("\n")
  end
end 

kuji = Kuji.new(5,5)
kuji.generate
puts kuji.output