Class: Queen

Inherits:
Piece show all
Defined in:
lib/bangkok/piece.rb

Instance Attribute Summary

Attributes inherited from Piece

#color, #piece, #square

Instance Method Summary collapse

Methods inherited from Piece

#clear_to?, create, #move_off_board, #move_to, #to_s

Constructor Details

#initialize(board, listener, color, square) ⇒ Queen

Returns a new instance of Queen.



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# File 'lib/bangkok/piece.rb', line 95

def initialize(board, listener, color, square)
  super(board, listener, color, :Q, square)
end

Instance Method Details

#could_perform_move(move) ⇒ Object

There can be more than one queen on the board, thus this method must be implemented.



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# File 'lib/bangkok/piece.rb', line 101

def could_perform_move(move)
  return false unless super

  # Check for horizontal or vertical
  square = move.square
  if @square.file == square.file || @square.rank == square.rank
    return clear_to?(square)
  end

  # Check for diagonal
  return false unless square.color == @square.color
  d_file = (@square.file - square.file).abs
  d_rank = (@square.rank - square.rank).abs
  return false unless d_file == d_rank # diagonal
  return clear_to?(square)
end