public <T extends Enum<T> & Turn> CheckersGameBuilder(
PlayerLookup<CheckersPieceDescription> playerLookup,
BoardIdService boardIdService,
Class<T> turnType) {
if (playerLookup.getAllPlayers().size() != 2) {
throw new IllegalArgumentException("2 players are required for checkers");
}
this.playerLookup = playerLookup;
// defaults
checkersGoalService = new CheckersGoalService(playerLookup);
this.checkersCostFunctionService =
new CheckersCostFunctionService(playerLookup, checkersGoalService);
this.useCaching = true;
this.useAlphaBetaPrunning = true;
this.depthLimit = DEFAULT_DEPTH_LIMIT;
this.boardIdService = boardIdService;
// random starting turn
EnumSet<T> turns = EnumSet.allOf(turnType);
startingTurn = Iterators.get(turns.iterator(), (int) (Math.random() * turns.size()));
}
private CheckersBoard createStartingState(
PlayerLookup<CheckersPieceDescription> playerLookup,
PieceLookup<CheckersPieceDescription> pieceLookup) {
CheckersBoard startingState =
new CheckersBoard(boardIdService.nextId(), startingTurn, pieceLookup);
Player<CheckersPieceDescription> firstPlayer = playerLookup.getPlayer(startingTurn.getId());
int player1PlacedPiece = 1;
int player2PlacedPiece = 0;
for (CheckersPieceDescription piece : pieceLookup.getAllPieces()) {
Position position;
if (piece.getType() == Type.STANDARD) {
if (piece.getPlayer().equals(firstPlayer)) {
int xCoord = (int) (player1PlacedPiece % startingState.getBoardExtremity().getXCoord());
int yCoord = player1PlacedPiece / startingState.getBoardExtremity().getXCoord();
if (yCoord == 1) {
xCoord--;
}
position = new Position(xCoord, yCoord);
player1PlacedPiece += 2;
} else {
int xCoord =
(int) (player2PlacedPiece % (startingState.getBoardExtremity().getXCoord()));
int yCoord =
(startingState.getBoardExtremity().getYCoord() - 1)
- (player2PlacedPiece / (startingState.getBoardExtremity().getXCoord()));
if (yCoord == 6) {
xCoord++;
}
position = new Position(xCoord, yCoord);
player2PlacedPiece += 2;
}
System.out.println(
"adding position at: "
+ position
+ " for player "
+ piece.getPlayer().getPlayerId()
+ " player1PlacedPiece="
+ player1PlacedPiece
+ " player2PlacedPiece="
+ player2PlacedPiece);
CheckersPiece positionedPiece = new CheckersPiece(position, piece);
startingState.addPiece(positionedPiece);
}
}
return startingState;
}
