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<?php declare(strict_types=1); |
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class ChessPiece { |
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const KING = 1; |
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const QUEEN = 2; |
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const ROOK = 3; |
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const BISHOP = 4; |
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const KNIGHT = 5; |
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const PAWN = 6; |
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public function __construct( |
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public int $chessGameID, |
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public int $accountID, |
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public string $colour, |
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public int $pieceID, |
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public int $x, |
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public int $y, |
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public int $pieceNo = -1) { |
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} |
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public function isSafeMove(array &$board, array &$hasMoved, int $toX = -1, int $toY = -1) : bool { |
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$x = $this->x; |
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$y = $this->y; |
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$moveInfo = ChessGame::movePiece($board, $hasMoved, $x, $y, $toX, $toY); |
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$safe = !ChessGame::isPlayerChecked($board, $hasMoved, $this->colour); |
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ChessGame::undoMovePiece($board, $hasMoved, $x, $y, $toX, $toY, $moveInfo); |
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return $safe; |
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} |
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public function isAttacking(array &$board, array &$hasMoved, bool $king, int $x = -1, int $y = -1) : bool { |
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$moves = $this->getPossibleMoves($board, $hasMoved, null, true); |
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foreach ($moves as $move) { |
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$p = $board[$move[1]][$move[0]]; |
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if (($move[0] == $x && $move[1] == $y) || ($king === true && $p != null && $p->pieceID == self::KING && $this->colour != $p->colour)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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public function getPossibleMoves(array &$board, array &$hasMoved, int $forAccountID = null, bool $attackingCheck = false) : array { |
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$moves = array(); |
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if ($forAccountID === null || $this->accountID == $forAccountID) { |
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if ($this->pieceID == self::PAWN) { |
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$dirY = $this->colour == ChessGame::PLAYER_BLACK ? 1 : -1; |
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$moveY = $this->y + $dirY; |
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//Pawn forward movement is not attacking - so don't check it if doing an attacking check. |
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if (!$attackingCheck) { |
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if (ChessGame::isValidCoord($this->x, $moveY, $board) && $board[$moveY][$this->x] === null && $this->isSafeMove($board, $hasMoved, $this->x, $moveY)) { |
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$moves[] = array($this->x, $moveY); |
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} |
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$doubleMoveY = $moveY + $dirY; |
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if ($this->y - $dirY == 0 || $this->y - $dirY * 2 == count($board)) { //Double move first move |
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if ($board[$moveY][$this->x] === null && $board[$doubleMoveY][$this->x] === null && $this->isSafeMove($board, $hasMoved, $this->x, $doubleMoveY)) { |
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$moves[] = array($this->x, $doubleMoveY); |
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} |
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} |
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} |
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for ($i = -1; $i < 2; $i += 2) { |
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$moveX = $this->x + $i; |
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if (ChessGame::isValidCoord($moveX, $moveY, $board)) { |
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if ($attackingCheck || |
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((($hasMoved[ChessPiece::PAWN][0] == $moveX && $hasMoved[ChessPiece::PAWN][1] == $this->y) || |
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($board[$moveY][$moveX] != null && $board[$moveY][$moveX]->colour != $this->colour)) |
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&& $this->isSafeMove($board, $hasMoved, $moveX, $moveY))) { |
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$moves[] = array($moveX, $moveY); |
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} |
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} |
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} |
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} elseif ($this->pieceID == self::KING) { |
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for ($i = -1; $i < 2; $i++) { |
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for ($j = -1; $j < 2; $j++) { |
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if ($i != 0 || $j != 0) { |
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$this->addMove($this->x + $i, $this->y + $j, $board, $moves, $hasMoved, $attackingCheck); |
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} |
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} |
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} |
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//Castling is not attacking - so don't check it if doing an attacking check. |
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if (!$attackingCheck && !$hasMoved[$this->colour][ChessPiece::KING] && !ChessGame::isPlayerChecked($board, $hasMoved, $this->colour)) { |
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if (!$hasMoved[$this->colour][ChessPiece::ROOK]['Queen'] && |
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ChessGame::isValidCoord($this->x - 1, $this->y, $board) && $board[$this->y][$this->x - 1] === null && |
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ChessGame::isValidCoord($this->x - 3, $this->y, $board) && $board[$this->y][$this->x - 3] === null && |
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$this->isSafeMove($board, $hasMoved, $this->x - 1, $this->y)) { |
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$this->addMove($this->x - 2, $this->y, $board, $moves, $hasMoved, $attackingCheck); |
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} |
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if (!$hasMoved[$this->colour][ChessPiece::ROOK]['King'] && |
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ChessGame::isValidCoord($this->x + 1, $this->y, $board) && $board[$this->y][$this->x + 1] === null && |
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$this->isSafeMove($board, $hasMoved, $this->x + 1, $this->y)) { |
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$this->addMove($this->x + 2, $this->y, $board, $moves, $hasMoved, $attackingCheck); |
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} |
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} |
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} elseif ($this->pieceID == self::QUEEN) { |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(--$moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Left |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(++$moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Right |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove($moveX, ++$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove($moveX, --$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Down |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(--$moveX, --$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up-Left |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(++$moveX, --$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up-Right |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(--$moveX, ++$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Down-Left |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(++$moveX, ++$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up-Left |
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} elseif ($this->pieceID == self::ROOK) { |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(--$moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Left |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(++$moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Right |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove($moveX, ++$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove($moveX, --$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Down |
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} elseif ($this->pieceID == self::BISHOP) { |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(--$moveX, --$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up-Left |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(++$moveX, --$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up-Right |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(--$moveX, ++$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Down-Left |
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$moveX = $this->x; |
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$moveY = $this->y; |
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while ($this->addMove(++$moveX, ++$moveY, $board, $moves, $hasMoved, $attackingCheck) && $board[$moveY][$moveX] === null); //Up-Left |
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} elseif ($this->pieceID == self::KNIGHT) { |
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$moveX = $this->x - 1; |
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$moveY = $this->y - 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2up-left |
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$moveX += 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2up-right |
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$moveY = $this->y + 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2down-right |
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$moveX -= 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2down-left |
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$moveX = $this->x - 2; |
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$moveY = $this->y - 1; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2left-up |
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$moveY += 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2left-down |
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$moveX = $this->x + 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2right-down |
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$moveY -= 2; |
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$this->addMove($moveX, $moveY, $board, $moves, $hasMoved, $attackingCheck); //2right-up |
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} |
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} |
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return $moves; |
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} |
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private function addMove(int $toX, int $toY, array &$board, array &$moves, array &$hasMoved, bool $attackingCheck = true) : bool { |
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if (ChessGame::isValidCoord($toX, $toY, $board)) { |
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if (($board[$toY][$toX] === null || $board[$toY][$toX]->colour != $this->colour)) { |
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//We can only actually move to this position if it is safe to do so, however we can pass through it looking for a safe move so we still want to return true. |
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if (($attackingCheck === true || $this->isSafeMove($board, $hasMoved, $toX, $toY))) { |
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$moves[] = array($toX, $toY); |
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} |
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return true; |
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} |
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} |
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return false; |
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} |
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public function promote(int $pawnPromotionPieceID, array &$board) : array { |
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$takenNos = array(); |
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foreach ($board as $row) { |
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foreach ($row as $piece) { |
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if ($piece != null && $piece->pieceID == $pawnPromotionPieceID && $piece->colour == $this->colour) { |
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$takenNos[$piece->pieceNo] = true; |
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} |
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} |
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} |
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$i = 0; |
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while (isset($takenNos[$i])) { |
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$i++; |
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} |
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return array('PieceID' => $pawnPromotionPieceID, 'PieceNo' => $i); |
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} |
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public function getPieceLetter() : string { |
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return self::getLetterForPiece($this->pieceID, $this->colour); |
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} |
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public function getPieceSymbol() : string { |
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return self::getSymbolForPiece($this->pieceID, $this->colour); |
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} |
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public static function getSymbolForPiece(int $pieceID, string $colour) : string { |
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return "&#" . (9811 + $pieceID + ($colour == ChessGame::PLAYER_WHITE ? 0 : 6)) . ";"; |
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} |
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public static function getLetterForPiece(int $pieceID, string $colour) : string { |
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$letter = match($pieceID) { |
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self::KING => 'k', |
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self::QUEEN => 'q', |
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self::ROOK => 'r', |
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self::BISHOP => 'b', |
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self::KNIGHT => 'n', |
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self::PAWN => 'p', |
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}; |
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if ($colour == ChessGame::PLAYER_WHITE) { |
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$letter = strtoupper($letter); |
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} |
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return $letter; |
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} |
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public static function getPieceForLetter(string $letter) : int { |
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return match(strtolower($letter)) { |
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'k' => self::KING, |
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'q' => self::QUEEN, |
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'r' => self::ROOK, |
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'b' => self::BISHOP, |
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'n' => self::KNIGHT, |
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'p' => self::PAWN, |
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}; |
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} |
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} |
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smrealms /
smr
