private List<Square> validMovesForPawn(Square square) {
List<Square> validMoves = new ArrayList<Square>();
// Regular moves, 1 or 2 up or down depending on color
Piece piece = square.getPiece();
if (piece.isWhite()) {
int movesUp = piece.movesUp();
if (square.containsPawnOnStartingRow()) movesUp += 1;
validMoves.addAll(validMovesForSquareInDirection(square, movesUp, 1, 0, 0, 0));
} else {
int movesDown = piece.movesDown();
if (square.containsPawnOnStartingRow()) movesDown += 1;
validMoves.addAll(validMovesForSquareInDirection(square, movesDown, 0, 0, 1, 0));
}
// Attacking move
int rowColPairs[][] = {{-1, -1}, {-1, 1}};
for (int i = 0; i < rowColPairs.length; i++) {
int row = square.Row + rowColPairs[i][0];
int col = square.Col + rowColPairs[i][1];
if (rowAndColAreWithinBounds(row, col)) {
Square s = Board[row][col];
if (s.isOccupiedByPieceOfColor(square.getPiece().oppositeColor())) validMoves.add(s);
}
}
return validMoves;
}
private List<Square> validMovesForPieceOnSquareExCheck(Square square) {
Piece piece = square.getPiece();
List<Square> validMoves = new ArrayList<Square>();
// Special moves the piece is a pawn or a knight
if (piece.canMoveLikePawn()) return validMovesForPawn(square);
if (piece.canMoveLikeKnight()) return validMovesForKnight(square);
// Add all normal directional moves
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesUp(), 1, 0, 0, 0));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesSide(), 0, 1, 0, 0));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesDown(), 0, 0, 1, 0));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesSide(), 0, 0, 0, 1));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesDiagonal(), 1, 1, 0, 0));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesDiagonal(), 1, 0, 0, 1));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesDiagonal(), 0, 1, 1, 0));
validMoves.addAll(validMovesForSquareInDirection(square, piece.movesDiagonal(), 0, 0, 1, 1));
return validMoves;
}
