Module: Chess::BoardPos

Included in:
Board
Defined in:
lib/chess/board/board_pos.rb

Overview

Board

Instance Method Summary collapse

Instance Method Details

#east_pos(file, rank) ⇒ Object

the east pos from the given pos



18
19
20
 
# File 'lib/chess/board/board_pos.rb', line 18

def east_pos(file, rank)
  [(file.ord - 1).chr, rank]
end

#north_east_pos(file, rank) ⇒ Object

the north_east_pos pos from the given pos



28
29
30
 
# File 'lib/chess/board/board_pos.rb', line 28

def north_east_pos(file, rank)
  [(file.ord - 1).chr, rank + 1]
end

#north_pos(file, rank) ⇒ Object

the north pos from the given pos



8
9
10
 
# File 'lib/chess/board/board_pos.rb', line 8

def north_pos(file, rank)
  [file, rank + 1]
end

#north_west_pos(file, rank) ⇒ Object

the north_west_pos pos from the given pos



33
34
35
 
# File 'lib/chess/board/board_pos.rb', line 33

def north_west_pos(file, rank)
  [(file.ord + 1).chr, rank + 1]
end

#pos_in_range?(file, rank) ⇒ Boolean

checks if a pos is in range

Examples:

file and rank are decomposed from array

pos_in_range?(['d',0])



57
58
59
60
61
62
63
 
# File 'lib/chess/board/board_pos.rb', line 57

def pos_in_range?((file, rank))
  first_rank = 0
  last_rank = 7
  first_file_ord = 'a'.ord
  last_file_ord = 'h'.ord
  rank.between?(first_rank, last_rank) && file.ord.between?(first_file_ord, last_file_ord)
end

#pos_nil?(file, rank) ⇒ Boolean

checks if a pos is nil value

Examples:

file and rank are decomposed from array

pos_nil?(['d',0])



50
51
52
 
# File 'lib/chess/board/board_pos.rb', line 50

def pos_nil?((file, rank))
  piece_at(file, rank).nil?
end

#south_east_pos(file, rank) ⇒ Object

the south_east_pos pos from the given pos



38
39
40
 
# File 'lib/chess/board/board_pos.rb', line 38

def south_east_pos(file, rank)
  [(file.ord - 1).chr, rank - 1]
end

#south_pos(file, rank) ⇒ Object

the south pos from the given pos



13
14
15
 
# File 'lib/chess/board/board_pos.rb', line 13

def south_pos(file, rank)
  [file, rank - 1]
end

#south_west_pos(file, rank) ⇒ Object

the south_west_pos pos from the given pos



43
44
45
 
# File 'lib/chess/board/board_pos.rb', line 43

def south_west_pos(file, rank)
  [(file.ord + 1).chr, rank - 1]
end

#west_pos(file, rank) ⇒ Object

the west pos from the given pos



23
24
25
 
# File 'lib/chess/board/board_pos.rb', line 23

def west_pos(file, rank)
  [(file.ord + 1).chr, rank]
end