Class: Game

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

Defined Under Namespace

Classes: IllegalMove

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Game

Returns a new instance of Game.



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# File 'lib/game.rb', line 4

def initialize
  @board = Board.new
  @king_to_check = {black: @board.at(3,0), white: @board.at(4,7)}
  @moves = []
  @turn = :white
  @over = false
end

Instance Attribute Details

#turn ⇒ Object (readonly)

Returns the value of attribute turn.



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# File 'lib/game.rb', line 3

def turn
  @turn
end

Instance Method Details

#at(x, y) ⇒ Object 



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

def at(x,y)
  @board.at(x,y)
end

#over? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/game.rb', line 16

def over?
  @over
end

#play(point_a, point_b) ⇒ Object

Raises:



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

def play(point_a, point_b) 
  raise Game::IllegalMove, "Game over" if @over

  piece, at_destination = at(*point_a), at(*point_b) 

  unless piece.color == @turn
      raise Game::IllegalMove, 
        "It is #{@turn.to_s.capitalize}'s turn" 
  end

  @board.move(piece, *point_b)
  @moves << {
    piece: {
      point_a: point_a,
      point_b: point_b,
    },
    capture: at_destination,
  }
  switch_turn

  if @king_to_check[@turn].checked?(@board)
    undo
    raise Game::IllegalMove, "#{@turn}'s king is in check!"
  end
end

#resign ⇒ Object 



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# File 'lib/game.rb', line 63

def resign
  @over = true
  print "#{@turn.to_s.capitalize} resigns, "
  switch_turn
  puts "#{@turn.to_s.capitalize} wins!" 
end

#show ⇒ Object 



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# File 'lib/game.rb', line 12

def show
  puts @board
end

#undo ⇒ Object 



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# File 'lib/game.rb', line 24

def undo
  move = @moves.pop
  piece = at(*move[:piece][:point_b])
  new_piece = piece.class.new(*move[:piece][:point_a])
  capture = move[:capture]

  @board.remove(piece)
  @board.place(new_piece)
  @board.place(capture)

  switch_turn
end