Class: Piece

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

Direct Known Subclasses

Bishop, King, Knight, Pawn, Queen, Rook

Class Method Summary collapse

Class Method Details

.capturable?(orig, dest, board) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pieces/piece.rb', line 44

def self.capturable?(orig, dest, board)
  orig_y, orig_x = orig
  dest_y, dest_x = dest
  orig_piece = board[orig_y][orig_x]
  dest_piece = board[dest_y][dest_x]

  return false unless orig_piece && dest_piece

  orig_piece_color = orig_piece[0]
  dest_piece_color = dest_piece[0]

  orig_piece_color != dest_piece_color
end

.destination_occupied?(dest, board) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pieces/piece.rb', line 58

def self.destination_occupied?(dest, board)
  dest_y = dest[0]
  dest_x = dest[1]

  !board[dest_y][dest_x].nil?
end

.obstructed?(orig, dest, board) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pieces/piece.rb', line 4

def self.obstructed?(orig, dest, board)
  orig_y, orig_x = orig
  dest_y, dest_x = dest

  if orig_y == dest_y

    direction = orig_x > dest_x ? 1 : -1
    ((orig_x - dest_x).abs - 1).times do |x|
      test_pos = orig_x - (x * direction) - direction
      return true unless board[orig_y][test_pos].nil?
    end

    false

  elsif orig_x == dest_x

    direction = orig_y > dest_y ? 1 : -1
    ((orig_y - dest_y).abs - 1).times do |y|
      test_pos = orig_y - (y * direction) - direction
      return true unless board[test_pos][orig_x].nil?
    end

    false

  elsif (orig_y - dest_y).abs == (orig_x - dest_x).abs

    x_direction = orig_x > dest_x ? 1 : -1
    y_direction = orig_y > dest_y ? 1 : -1

    ((orig_y - dest_y).abs - 1).times do |v|
      test_y_pos = orig_y - (v * y_direction) - y_direction
      test_x_pos = orig_x - (v * x_direction) - x_direction
      return true unless board[test_y_pos][test_x_pos].nil?
    end

    false

  end
end