/**
* @param BoardWalker $walker
* @param MoveInterface $lastMove
*/
private function walkEnPassant(BoardWalker $walker, MoveInterface $lastMove = null)
{
$lastEnemyPiece = $lastMove ? $walker->getBoard()->getSquare($lastMove->getTo())->getPiece() : null;
if ($lastMove === null || $lastEnemyPiece === null || $lastEnemyPiece->getType() !== PieceInterface::TYPE_PAWN) {
return;
}
$leftToPosition = $walker->peek(BoardWalker::DIRECTION_LEFT, 1, null, true, false);
$rightToPosition = $walker->peek(BoardWalker::DIRECTION_RIGHT, 1, null, true, false);
if ($leftToPosition !== null) {
if (abs(BoardHelper::getRowFromPosition($lastMove->getFrom()) - BoardHelper::getRowFromPosition($leftToPosition)) !== 2) {
return;
}
if ($lastMove->getTo() === $leftToPosition) {
// en passant left
$walker->forwardLeft(1, false)->restart();
}
}
if ($rightToPosition !== null) {
if (abs(BoardHelper::getRowFromPosition($lastMove->getFrom()) - BoardHelper::getRowFromPosition($rightToPosition)) !== 2) {
return;
}
if ($lastMove->getTo() === $rightToPosition) {
// en passant left
$walker->forwardRight(1, false)->restart();
}
}
}
public function testGetRow()
{
$this->boardWalker->start(SquareInterface::POSITION_D5);
$this->assertEquals(5, $this->boardWalker->getRow());
$this->boardWalker->forward(1);
$this->assertEquals(6, $this->boardWalker->getRow());
$this->boardWalker->start(SquareInterface::POSITION_D5)->left(1);
$this->assertEquals(5, $this->boardWalker->getRow());
$this->boardWalker->start(SquareInterface::POSITION_D5)->backward(1);
$this->assertEquals(4, $this->boardWalker->getRow());
$this->boardWalker->start(SquareInterface::POSITION_D5)->right(1);
$this->assertEquals(5, $this->boardWalker->getRow());
}
/**
* {@inheritdoc}
*/
public function configureWalker(BoardWalker $walker, GameInterface $game)
{
$walker->omnidirectional(1);
$kingPosition = BoardHelper::getKingPosition($game->getBoard(), $game->getCurrentColor());
$kingColumn = BoardHelper::getColumnFromPosition($kingPosition);
$kingRow = BoardHelper::getRowFromPosition($kingPosition);
$board = $game->getBoard();
$king = $board->getSquare($kingPosition)->getPiece();
$track = $kingPosition === SquareInterface::POSITION_E1;
// check for possible castle move
if (empty($game->getMovesByPiece($king->getId()))) {
// see if one of the rooks did not make any moves
$rookCriteria = ['piece_type' => PieceInterface::TYPE_ROOK, 'piece_color' => $game->getCurrentColor()];
foreach ($board->getPiecesBy($rookCriteria) as $rookPosition => $rook) {
if (empty($game->getMovesByPiece($rook->getId()))) {
// see if there are no pieces between the king and this rook
$rookColumn = BoardHelper::getColumnFromPosition($rookPosition);
$columnDiff = abs($kingColumn - $rookColumn) - 1;
$track = $track === true && $columnDiff === 3;
if ($columnDiff > 1) {
$skip = false;
for ($x = 1; $x <= $columnDiff; $x++) {
if ($rookColumn > $kingColumn) {
$cursor = $rookColumn - $x . $kingRow;
} else {
$cursor = $rookColumn + $x . $kingRow;
}
if (null !== ($piece = $board->getSquare($cursor)->getPiece())) {
$skip = true;
break;
}
}
if ($skip) {
continue;
}
if ($kingColumn > $rookColumn) {
if ($game->getCurrentColor() === Color::WHITE) {
$walker->jump(BoardWalker::DIRECTION_LEFT, 2);
} else {
$walker->jump(BoardWalker::DIRECTION_RIGHT, 2);
}
} else {
if ($game->getCurrentColor() === Color::WHITE) {
$walker->jump(BoardWalker::DIRECTION_RIGHT, 2);
} else {
$walker->jump(BoardWalker::DIRECTION_LEFT, 2);
}
}
}
}
}
}
}
/**
* {@inheritdoc}
*/
public function configureWalker(BoardWalker $walker, GameInterface $game)
{
$walker->lshaped();
}
/**
* {@inheritdoc}
*/
public function configureWalker(BoardWalker $walker, GameInterface $game)
{
$walker->omnidirectional('*');
}
/**
* {@inheritdoc}
*/
public function configureWalker(BoardWalker $walker, GameInterface $game)
{
$walker->horizontal('*');
$walker->vertical('*');
}