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OOP_3B4_Project
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undo and enpassant undo

This commit is contained in:
utente 2025-05-09 09:27:37 +02:00
parent 9e1e303d6c
commit f53bc258b4
1 changed files with 68 additions and 1 deletions
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69
src/backend/Board.java
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@ -3,12 +3,14 @@ package backend;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Set;
import java.util.Stack;
public class Board {
private int colNum;
private int lineNum;
private Piece[][] board;
private Stack<MoveRecord> moveHistory = new Stack<>();
private EnPassant enPassant = new EnPassant();
private int turnNumber = 0;
private boolean isWhiteTurn = true;
@ -138,7 +140,23 @@ public class Board {
void movePiece(int fromX, int fromY, int toX, int toY) { //from private to not
Piece moving = board[fromY][fromX];
Piece captured = board[toY][toX];
// For en passant
if (enPassant.isEnPassantCapture(moving, fromX, toX, toY, board)) {
int capturedY = moving.isWhite() ? toY + 1 : toY - 1;
captured = board[capturedY][toX];
board[capturedY][toX] = null;
}
// Save the move
moveHistory.push(new MoveRecord(
new Piece(moving.getX(), moving.getY(), moving.getType(), moving.isWhite()),
captured == null ? null : new Piece(captured.getX(), captured.getY(), captured.getType(), captured.isWhite()),
fromX, fromY, toX, toY,
turnNumber, isWhiteTurn,
enPassant.getTarget()
));
// En passant capture
if (enPassant.isEnPassantCapture(moving, fromX, toX, toY, board)) {
int capturedY = moving.isWhite() ? toY + 1 : toY - 1;
@ -330,8 +348,35 @@ public class Board {
public void undoLastMove() {
//TODO
if (moveHistory.isEmpty()) return;
MoveRecord last = moveHistory.pop();
this.turnNumber = last.turnNumber;
this.isWhiteTurn = last.wasWhiteTurn;
enPassant.setTarget(last.enPassantTarget);
board[last.fromY][last.fromX] = new Piece(
last.fromX, last.fromY, last.movedPiece.getType(), last.movedPiece.isWhite()
);
board[last.toY][last.toX] = null;
// Restore captured piece
if (last.capturedPiece != null) {
int cx = last.capturedPiece.getX();
int cy = last.capturedPiece.getY();
// Check for en passant capture
if (last.movedPiece.getType() == PieceType.Pawn && cy != last.toY) {
// En passant capture happened — captured piece is not at (toX, toY)
board[cy][cx] = new Piece(cx, cy, last.capturedPiece.getType(), last.capturedPiece.isWhite());
} else {
board[cy][cx] = new Piece(cx, cy, last.capturedPiece.getType(), last.capturedPiece.isWhite());
}
}
}
public Board(Board other) {
this.colNum = other.colNum;
this.lineNum = other.lineNum;
@ -354,5 +399,27 @@ public class Board {
public void playMove(Move move) {
//TODO
}
private class MoveRecord {
final Piece movedPiece;
final Piece capturedPiece;
final int fromX, fromY, toX, toY;
final int turnNumber;
final boolean wasWhiteTurn;
final int[] enPassantTarget;
MoveRecord(Piece movedPiece, Piece capturedPiece, int fromX, int fromY, int toX, int toY,
int turnNumber, boolean wasWhiteTurn, int[] enPassantTarget) {
this.movedPiece = movedPiece;
this.capturedPiece = capturedPiece;
this.fromX = fromX;
this.fromY = fromY;
this.toX = toX;
this.toY = toY;
this.turnNumber = turnNumber;
this.wasWhiteTurn = wasWhiteTurn;
this.enPassantTarget = enPassantTarget == null ? null : new int[]{enPassantTarget[0], enPassantTarget[1]};
}
}
}