Class: Display

Inherits:
Object
  • Object
show all
Defined in:
lib/fen/display.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(fen) ⇒ Display

Returns a new instance of Display.



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# File 'lib/fen/display.rb', line 7

def initialize(fen)
  @fen = fen
  @piece_array = convert_fen_to_piece_array
end

Instance Attribute Details

#fen ⇒ Object

Returns the value of attribute fen.



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# File 'lib/fen/display.rb', line 4

def fen
  @fen
end

#piece_array ⇒ Object (readonly)

Returns the value of attribute piece_array.



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# File 'lib/fen/display.rb', line 5

def piece_array
  @piece_array
end

Instance Method Details

#board ⇒ Object 



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# File 'lib/fen/display.rb', line 24

def board
  board = file_notation_row
  board += top_row

  ChessConstants::RANK_ARRAY.reverse.each do |rank|
    board += piece_row(rank.to_i)
    board += line_row unless rank.to_i == 1
  end

  board += bottom_row
  board += file_notation_row
end

#bottom_row ⇒ Object 



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# File 'lib/fen/display.rb', line 109

def bottom_row 

  counter = 0

  bottom_row = "  "
  bottom_row += unicode_board(:bottom_left_corner)
  bottom_row += unicode_board(:horizontal)
  bottom_row += unicode_board(:horizontal)

  loop do
    bottom_row += unicode_board(:bottom_mid)
    bottom_row += unicode_board(:horizontal)
    bottom_row += unicode_board(:horizontal)
    counter += 1
    break if counter == ChessConstants::NUMBER_OF_COLUMNS - 1
  end
  bottom_row += unicode_board(:bottom_right_corner)  
  bottom_row += "\n"
end

#convert_fen_to_piece_array ⇒ Object 



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# File 'lib/fen/display.rb', line 12

def convert_fen_to_piece_array
  fen_array = @fen.split("/")

  first_rank_and_details = fen_array.last.split(" ")
  first_rank = first_rank_and_details[0]

  piece_array = fen_array
  piece_array[-1] = first_rank
  
  @piece_array = piece_array
end

#file_notation_row ⇒ Object 



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# File 'lib/fen/display.rb', line 37

def file_notation_row
  file_notation_row = "   "
  ChessConstants::FILE_ARRAY.each { |value| file_notation_row += "#{value}  "}
  file_notation_row += "\n"
end

#line_row ⇒ Object 



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# File 'lib/fen/display.rb', line 90

def line_row
  counter = 0

  line_row =  "  "
  line_row += unicode_board(:left_mid)
  line_row += unicode_board(:horizontal)
  line_row += unicode_board(:horizontal)

  loop do
    line_row += unicode_board(:cross)
    line_row += unicode_board(:horizontal)
    line_row += unicode_board(:horizontal)
    counter += 1
    break if counter == ChessConstants::NUMBER_OF_COLUMNS - 1
  end
  line_row += unicode_board(:right_mid)
  line_row += "\n"    
end

#piece_row(rank_notation) ⇒ Object 



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# File 'lib/fen/display.rb', line 61

def piece_row(rank_notation) 
  piece_row = rank_notation.to_s
  piece_row += " "

  @piece_array.reverse[rank_notation - 1].each_char do |board_square|
    piece_row += unicode_board(:vertical)

    if board_square.to_i > 1 
      (board_square.to_i - 1).times do
        piece_row += "  "
        piece_row += unicode_board(:vertical)
      end

      piece_row += " "
    elsif board_square.to_i == 1
      piece_row += " "
    else
      piece_row += unicode_piece(board_square.to_sym)
    end
    piece_row += " "
  end

  piece_row += unicode_board(:vertical)

  piece_row += " "
  piece_row += rank_notation.to_s
  piece_row += "\n"
end

#top_row ⇒ Object 



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# File 'lib/fen/display.rb', line 43

def top_row
  counter = 0
  top_row = "  "
  top_row += unicode_board(:top_left_corner)
  top_row += unicode_board(:horizontal)
  top_row += unicode_board(:horizontal)

  loop do
    top_row += unicode_board(:top_mid)
    top_row += unicode_board(:horizontal)
    top_row += unicode_board(:horizontal)
    counter += 1
    break if counter == ChessConstants::NUMBER_OF_COLUMNS - 1
  end
  top_row += unicode_board(:top_right_corner)
  top_row += "\n"
end

#unicode_board(key) ⇒ Object 



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# File 'lib/fen/display.rb', line 129

def unicode_board(key)
  hash = {horizontal: "\u2500",
          vertical: "\u2502",
          top_left_corner: "\u250C",
          top_right_corner: "\u2510",
          bottom_left_corner: "\u2514",
          bottom_right_corner: "\u2518",
          top_mid: "\u252c",
          left_mid: "\u251c",
          right_mid: "\u2524",
          bottom_mid: "\u2534",
          cross: "\u253c"}

  return hash.fetch(key).encode('utf-8')   
end

#unicode_piece(piece) ⇒ Object 



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# File 'lib/fen/display.rb', line 145

def unicode_piece(piece)

  hash = {K: "\u2654",
          Q: "\u2655",
          R: "\u2656",
          B: "\u2657",
          N: "\u2658",
          P: "\u2659",
          k: "\u265A",
          q: "\u265B",
          r: "\u265C",
          b: "\u265D",
          n: "\u265E",
          p: "\u265F"}

  return hash.fetch(piece).encode('utf-8')
end