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# and open the template in the editor.

module SeniorSeminar
  class InvalidPlayException < Exception ; end
  class InvalidPieceException < Exception ; end
  class Board
    attr_reader :dimensions, :turn

    def initialize dimen = 6, players = 2
      @dimensions = [dimen, dimen]
      @field = [nil]*dimen
      @field.map! do |row|
        row = [nil]*dimen
      end
      @turn = 0
      @last_turn = nil
      @pieces = [:b, :w, :r, :g, :y, :c][0,players]
    end
    ...
    def rotate x, y, direction=:right
      times = direction_to_turns direction
      x,y = self.get_quadrant_coordinates x,y
      len = @dimensions[0] / 2
      times.times do
     @field.map.class #=> Array
     @field.map!.class #=>Enumerator
        # ^ this is the opposite of what the doc says
        @field = @field.map!.with_index do |line, i|
          line.map!.with_index do |elem, j|
            (x..(x+len))===i && (y..(y+len))===j ?
              @field[x+y+len-j-1][y+i-x] : elem
          end
        end
      end
    end
    ...
  end
end