## Hexagonal Grid Game Board

This week's quiz is to create the distance computation methods for a 
hexagonal game board. In addition to implementing the simple 
unobstructed distance you will also implement an obstructed_distance 
method: the distance between two positions where you must go around 
obstructions. I've provided a couple of classes to help you get 
started. The print method on HexBoard prints out a board where each 
hex displays it's distance from position [4,4].

Partial solutions are welcome! Team solutions are welcome! I want to 
see everyone on ruby-talk give this one a shot!

class Hex 
  def obstructed? 
    false 
  end 
end

class HexBoard 
  def initialize(rows=9, cols=9) 
    @rows, @cols = rows, cols 
    @board = Array.new(@rows) do |row| 
      Array.new(@cols) do |col| 
        Hex.new 
      end 
    end 
  end

  def distance(position1, position2) 
    # Distance between two hexes on the board 
  end

  def obstructed_distance(position1, position2, &block) 
    # Distance between two hexes on the board having to navigate obstructions 
    # Obstructions are detected by passing the hex in question into the block 
    # block will return true if the yielded hex should be counted as obstructed 
    # EX: dist = obstructed_distance(a, b) { |hex| hex.obstructed? } 
  end

  # This will print the board out to the console to let you 
  # know if you're on the right track 
  def draw 
    @rows.times do |row| 
      line = '' 
      line << "#{row}:" 
      (@cols - row).times {line << ' '}

      @cols.times do |col| 
        line << (distance([4,4], [row,col]) || 'X').to_s 
        line << ' ' 
      end

      puts line 
    end 
  end

  def [](row) 
    @board[row] 
  end 
end

board = HexBoard.new 
board.draw

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Example Output of print: 
0:         4 4 4 4 4 5 6 7 8 
1:        4 3 3 3 3 4 5 6 7 
2:       4 3 2 2 2 3 4 5 6 
3:      4 3 2 1 1 2 3 4 5 
4:     4 3 2 1 0 1 2 3 4 
5:    5 4 3 2 1 1 2 3 4 
6:   6 5 4 3 2 2 2 3 4 
7:  7 6 5 4 3 3 3 3 4 
8: 8 7 6 5 4 4 4 4 4