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chess: fixed field indices

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Field indices where counting up from h to a,
now they are counting up from a to h, so the board
is not inverted anymore
This commit is contained in:
TiynGER 2021-05-01 02:40:08 +02:00
parent 9095cf8eee
commit 3bc523c37a
1 changed files with 12 additions and 12 deletions
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24
src/chess.nim
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@ -77,8 +77,8 @@ const
## en passant pawn.
N = 10 ## `N` describes a move a field up the board from whites perspective.
S = -N ## `S` describes a move a field down the board from whites perspective.
W = 1 ## `W` describes a move a field to the left from whites perspective.
E = -W ## `E` describes a move a field to the right from whites perspective.
E = 1 ## `E` describes a move a field to the right from whites perspective.
W = -E ## `W` describes a move a field to the left from whites perspective.
# Directions for the pieces. Special moves are in separate arrays.
Knight_Moves = [N+N+E, N+N+W, E+E+N, E+E+S, S+S+E, S+S+W, W+W+N, W+W+S] ## \
## `Knight_Moves` describes the possible knight moves.
@ -129,14 +129,14 @@ let
}.newTable ## \
## `PieceChar` describes the representation for the pieceIDs for the cli.
FileChar = {
"a": 7,
"b": 6,
"c": 5,
"d": 4,
"e": 3,
"f": 2,
"g": 1,
"h": 0,
"a": 0,
"b": 1,
"c": 2,
"d": 3,
"e": 4,
"f": 5,
"g": 6,
"h": 7,
}.newTable ## \
# `FileChar` maps the files of the chessboard to numbers for better
# conversion.
@ -145,7 +145,7 @@ proc fieldToInd*(file: string, line: int): int =
## Calculate and return board index from `file` and `line` of a chess board.
## Returns -1 if the `field` was not input correct.
try:
return 1+(line+1)*10+FileChar[file]
return 1+(line+1)*10+(7-FileChar[file])
except IndexDefect, ValueError:
return -1
@ -160,7 +160,7 @@ proc fieldToInd*(field: string): int =
proc indToField*(ind: int): string =
## Calculate and returns field name from board index `ind`.
let line = (int)ind/10-1
let file_ind = (ind)%%10-1
let file_ind = 7-((ind)%%10-1)
for file, i in FileChar:
if FileChar[file] == file_ind:
return $file & $line