Module: Printer

Included in:
Board
Defined in:
lib/printer.rb

Constant Summary collapse

@@subrow =

Reference to current row within a cell

0
@@cell_number =

Reference to the current cell

1

Instance Method Summary collapse

Instance Method Details

#clear_all ⇒ Object 



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# File 'lib/printer.rb', line 53

def clear_all
  # Reset counters and clear terminal
  @@cell_number = 1
  system "clear" or system "cls"
end

#piece_to_string(piece_name) ⇒ Object 



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# File 'lib/printer.rb', line 89

def piece_to_string(piece_name)
  # Print pieces as two characters
  #   "pawn" -> "pa" , "bishop" -> "BI" , "king" -> "KI" , ...
  #   print nil as "  " so it takes up a two character width on the printed board
  piece_name == nil ? "  " : piece_name[0..1]
end

#print_board(piece_locations) ⇒ Object 



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# File 'lib/printer.rb', line 96

def print_board(piece_locations)
  printer do |tile_text, row_num|

    print_start_of_row(row_num)

    4.times do

      # Print cell and next neighboring cell,
      # then loop until 4 pairs of 2 cells have been printed, completing row
      color      = piece_locations[@@cell_number][:color]     || :black
      next_color = piece_locations[@@cell_number + 1][:color] || :black

      # Print two rows at a time as every two rows repeat
      #  alternating tile colors
      #    ________________________
      #   |   ###   ###   ###   ###| -> subrow 0
      #   |   ###   ###   ###   ###| -> subrow 1
      #   |   ###   ###   ###   ###| -> subrow 2
      #   |###   ###   ###   ###   | -> subrow 3
      #   |###   ###   ###   ###   | -> subrow 4
      #   |###   ###   ###   ###   | -> subrow 5
      #

      if @@subrow < 3
        print substitute_pieces(
          tile_text, @@cell_number, color, :white, piece_locations
        )
        print substitute_pieces(
          tile_text, @@cell_number + 1, next_color, :black, piece_locations
        )
      else
        print substitute_pieces(
          tile_text, @@cell_number, color, :black, piece_locations
        )
        print substitute_pieces(
          tile_text, @@cell_number + 1, next_color, :white, piece_locations
        )
      end

      if tile_text.include? "XX"
        # Incremenet cell_number unless last cell is being printed
        # to avoid an out of range error
        @@cell_number += 2 unless @@cell_number == 63
      end
    end

    print_end_of_row(row_num)

    # Incriment row index.
    # Reset once n reaches 6 (i.e., two complete cell rows have been printed - the pattern to repeat)
    @@subrow += 1
    @@subrow = 0 if @@subrow == 6
    puts
  end
end

#print_end_of_row(row_num) ⇒ Object 



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# File 'lib/printer.rb', line 46

def print_end_of_row(row_num)
  # Print row number 1...8 at end of each row
  if (@@subrow == 1 || @@subrow == 4) && row_num
    print " #{row_num}"
  end
end

#print_footer ⇒ Object 



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# File 'lib/printer.rb', line 29

def print_footer
  # Print chess board footer (Column Labels A to H)
  print "\s\s\s" # cell padding

  COLS.each { |c| print "  #{c}   " }
  puts
end

#print_header ⇒ Object 



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# File 'lib/printer.rb', line 20

def print_header
  # Print chess board Header (Title and then Column Labels A to H)
  print "\n\t>> Welcome to Terminal Chess v#{TerminalChess::VERSION}\n\n"
  print "\s\s\s" # cell padding

  COLS.each { |c| print "  #{c}   " }
  puts
end

#print_start_of_row(row_num) ⇒ Object 



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# File 'lib/printer.rb', line 37

def print_start_of_row(row_num)
  # Pad the start of each row with spacing or the row numbers 1..8
  if row_num
    print " #{row_num} "
  else
    print " " * 3
  end
end

#printer ⇒ Object 



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# File 'lib/printer.rb', line 60

def printer
  # Prints the board to terminal, based on layout defined by piece_locations

  clear_all
  print_header

  # Print first cell of each row, with row number
  (1..8).each do |row|
    yield "      "
    yield "  XX  ", "#{row}"
    yield "      "
  end

  print_footer
end

#substitute_pieces(text, index, color, background_color, piece_locations) ⇒ Object 



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# File 'lib/printer.rb', line 76

def substitute_pieces(text, index, color, background_color, piece_locations)
  piece = piece_to_string(piece_locations[index][:type])

  piece.upcase! unless piece == "pa"
  piece = piece.colorize(color)

  if background_color == :white
    text.gsub("XX", piece).on_light_white
  else
    text.gsub("XX", piece).on_light_black
  end
end