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fix errors and checkmate

This commit is contained in:
Lucie 2025-05-19 17:21:44 +02:00
parent 5f8d4f269a
commit e5cddf031b
5 changed files with 391 additions and 221 deletions
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56
src/backend/Board.java
View File

@ -70,6 +70,16 @@ public class Board {
return null; return null;
} }
public boolean isCheckmate() {
Check check = new Check(board);
return check.checkmate(whiteTurn);
}
public void setParameters() {
//
}
// INITIALISE THE BOARD // INITIALISE THE BOARD
public void initialise() { public void initialise() {
this.x = -1; this.x = -1;
@ -94,6 +104,10 @@ public class Board {
public void setPiece(boolean isWhite, PieceType type, int x, int y) { public void setPiece(boolean isWhite, PieceType type, int x, int y) {
board[y][x] = new Piece(isWhite, type, x, y); board[y][x] = new Piece(isWhite, type, x, y);
} }
public void setPiece(Piece piece) {
board[y][x] = new Piece(piece);
}
public void populateBoard() { public void populateBoard() {
for (int i = 0; i < lineNum; i++) { for (int i = 0; i < lineNum; i++) {
@ -192,6 +206,11 @@ public class Board {
this.x = -1; this.x = -1;
this.y = -1; this.y = -1;
} }
else if (board[y][x] != null && board[y][x].isWhite() == whiteTurn) {
// update coordinates
this.x = x;
this.y = y;
}
// the new location is highlighted, meaning it is a legal displacement // the new location is highlighted, meaning it is a legal displacement
else if (isHighlighted(x,y)) { else if (isHighlighted(x,y)) {
Piece piece = board[this.y][this.x]; Piece piece = board[this.y][this.x];
@ -384,7 +403,7 @@ public class Board {
whiteTurn = true; whiteTurn = true;
} }
Boolean[] booleans = new Boolean[7]; boolean[] booleans = new boolean[7];
for (int k = 1; k < 8; k++) { for (int k = 1; k < 8; k++) {
if (undo[lineNum].charAt(k) == 'f') { if (undo[lineNum].charAt(k) == 'f') {
booleans[k-1] = false; booleans[k-1] = false;
@ -431,32 +450,33 @@ public class Board {
} }
} }
public Board(Piece[][] board) {
Piece[][] newBoard = new Piece[lineNum][colNum];
for (int i = 0; i < colNum; i++) {
for (int j = 0; j < lineNum; j++) {
Piece piece = board[j][i];
if (piece != null) {
newBoard[j][i] = new Piece(piece);
}
}
}
}
public void playMove(Move move) { public void playMove(Move move) {
board[move.getFromY()][move.getFromX()].setX(move.getToX()); board[move.getFromY()][move.getFromX()].setX(move.getToX());
board[move.getFromY()][move.getFromX()].setY(move.getToY()); board[move.getFromY()][move.getFromX()].setY(move.getToY());
board[move.getToY()][move.getToX()] = board[move.getFromY()][move.getFromX()]; board[move.getToY()][move.getToX()] = board[move.getFromY()][move.getFromX()];
board[move.getFromY()][move.getFromX()] = null; board[move.getFromY()][move.getFromX()] = null;
promotion(x, y);
for (int x = 0; x < colNum; x++) {
for (int y = 0; y < lineNum; y++) {
canPromote(x, y);
}
}
//this.states.add(toString());
} }
ArrayList<Piece> promoPieces= new ArrayList<>(); private void promotion(int x, int y) {
boolean promotion;
private boolean canPromote(int x, int y) {
if (board[y][x] != null && board[y][x].getType() == PieceType.Pawn) { if (board[y][x] != null && board[y][x].getType() == PieceType.Pawn) {
boolean isWhite = board[y][x].isWhite(); // ✅ Declare 'isWhite' here boolean isWhite = board[y][x].isWhite(); // Declare 'isWhite' here
if ((isWhite && y == 0) || (!isWhite && y == 7)) { if ((isWhite && y == 0) || (!isWhite && y == 7)) {
board[y][x] = new Piece(isWhite, PieceType.Queen, x, y); // ✅ Now valid board[y][x] = new Piece(isWhite, PieceType.Queen, x, y); // Now valid
return true;
} }
} }
return false;
}
} }
}

249
src/backend/Check.java Normal file
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@ -0,0 +1,249 @@
package backend;
import java.util.ArrayList;
public class Check {
private Piece[][] board;
private int colNum;
private int lineNum;
private int[][] knightMoves;
private int[][] kingMoves;
private int[][] whitePawn;
private int[][] blackPawn;
private int[][] directions;
ArrayList<int[]> moves;
MoveCalculator calculator;
public Check(Piece[][] boardF) {
board = boardF;
knightMoves = new int[][] {{1, 2}, {2, 1}, {2, -1}, {1, -2}, {-1, -2}, {-2, -1}, {-2, 1}, {-1, 2}};
kingMoves = new int[][] {{1, 0}, {0, 1}, {-1, 0}, {0, -1}, {1, 1}, {-1, -1}, {1, -1}, {-1, 1}, {2, 0}, {-2, 0}};
whitePawn = new int[][] {{6}, {0, -1}, {1, -1}, {-1, -1}, {0, -2}};
blackPawn = new int[][] {{1}, {0, 1}, {1, 1}, {-1, 1}, {0, 2}};
directions = new int[][] {{0, 1}, {0, -1}, {1, 0}, {-1, 0}, {1, 1}, {1, -1}, {-1, 1}, {-1, -1}};
lineNum = 8;
colNum = 8;
calculator = new MoveCalculator(board);
}
// return the coordinates of the king of the color stated in parameter
public int[] findKing(boolean white) {
int[] coordinates = {-1, -1};
// iterate through all columns
for (int i = 0; i < colNum; i++) {
// iterate through all lines
for (int j = 0; j < lineNum; j++) {
// if the location is not empty, verify if it is the king from the right color
if (board[j][i] != null && board[j][i].getType() == PieceType.King && board[j][i].isWhite() == white) {
// update the coordinates to return
coordinates[0] = i;
coordinates[1] = j;
}
}
}
return coordinates;
}
// return if the piece of coordinates x,y in parameter is in check or not
public boolean check(Piece[][] board2, int x, int y, boolean white) {
int i;
int j;
// verify for knight or king displacements
for (int n = 0; n < knightMoves.length; n++) {
i = x + knightMoves[n][0];
j = y + knightMoves[n][1];
// verify if the coordinates are still in the board
if (calculator.inBoard(i,j)) {
// verify if the location is empty, if not, verify if the piece is a knight from the opponent
if (board2[j][i] != null && board2[j][i].isWhite() != white && board2[j][i].getType() == PieceType.Knight) {
return true;
}
}
}
for (int n = 0; n < kingMoves.length; n++) {
i = x + kingMoves[n][0];
j = y + kingMoves[n][1];
// verify if the coordinates are still in the board
if (calculator.inBoard(i,j)) {
// verify if the location is empty, if not, verify if the piece is a knight from the opponent
if (board2[j][i] != null && board2[j][i].isWhite() != white && board2[j][i].getType() == PieceType.King) {
return true;
}
}
}
// verify for pawn displacements
int[][] pawn;
if (white) {
pawn = whitePawn;
}
else {
pawn = blackPawn;
}
// consider only the diagonal displacements
for (int o = 2; o < 4; o++) {
i = x + pawn[o][0];
j = y + pawn[o][1];
// verify if the coordinates are still in the board
if (calculator.inBoard(i,j)) {
// verify if the location is empty, if not, verify if the piece is a pawn from the opponent
if (board2[j][i] != null && board2[j][i].isWhite() != white && board2[j][i].getType() == PieceType.Pawn) {
return true;
}
}
}
// verify for linear displacements (from directions array)
for (int p = 0; p < directions.length; p++) {
i = x + directions[p][0];
j = y + directions[p][1];
boolean metPiece = false;
// continue until the end of the board or until a piece is met
while (calculator.inBoard(i,j) && metPiece == false) {
// if the location is not empty
if (board2[j][i] != null) {
metPiece = true;
// verify if the met piece is from the opponent
if (board2[j][i].isWhite() != white) {
// first 4 directions correspond to horizontal and vertical displacements
if (p < 4 && (board2[j][i].getType() == PieceType.Rook || board2[j][i].getType() == PieceType.Queen)) {
return true;
}
// last 4 directions correspond to diagonal displacements
else if (p > 3 && (board2[j][i].getType() == PieceType.Bishop || board2[j][i].getType() == PieceType.Queen)) {
return true;
}
}
}
i += directions[p][0];
j += directions[p][1];
}
}
// if no true statement has been returned, the piece is not in check
return false;
}
// return if the king would be left in check if the move in parameter is played
public boolean checkIf(Move move, int kingX, int kingY, boolean white) {
// create a copy of the actual board
Piece[][] temporaryBoard = new Piece[lineNum][colNum];
for (int i = 0; i < colNum; i++) {
for (int j = 0; j < lineNum; j++) {
Piece piece = board[j][i];
if (piece != null) {
temporaryBoard[j][i] = new Piece(piece);
}
}
}
// make the displacement in the temporary board
temporaryBoard[move.getFromY()][move.getFromX()].setX(move.getToX());
temporaryBoard[move.getFromY()][move.getFromX()].setY(move.getToY());
temporaryBoard[move.getToY()][move.getToX()] = temporaryBoard[move.getFromY()][move.getFromX()];
temporaryBoard[move.getFromY()][move.getFromX()] = null;
// verify if in this temporary board, the king is in check
return check(temporaryBoard, kingX, kingY, white);
}
public String toString() {
String str = "";
// iterate through lines
for (int i = 0; i < lineNum; i++) {
// iterate through columns
for (int j = 0; j < colNum; j++) {
// write the corresponding letters depending on the piece on the board
if (board[i][j] == null) {
str += " ";
}
else if (board[i][j].isWhite()) {
str += "W" + board[i][j].getType().getSummary();
}
else if (board[i][j].isWhite() == false) {
str += "B" + board[i][j].getType().getSummary();
}
if (j != colNum-1) {
str += ",";
}
}
str += "\n";
}
return str;
}
// return if there is a checkmate
public boolean checkmate(boolean turnWhite) {
MoveCalculator legalMoves = new MoveCalculator(board);
ArrayList<int[]> moves;
int[] kingCoordinates = findKing(turnWhite);
if (check(board, kingCoordinates[0], kingCoordinates[1], turnWhite)) {
Board board2 = new Board(board);
String state = board2.toString();
boolean[] booleans = new boolean[7];
for (int k = 1; k < 8; k++) {
if (state.charAt(k) == 'f') {
booleans[k-1] = false;
}
else {
booleans[k-1] = true;
}
}
int[] integers = new int[4];
for (int n = 8; n < 12; n++) {
if (state.charAt(n) == '-') {
integers[n-8] = -1;
}
else {
integers[n-8] = Character.getNumericValue(state.charAt(n));
}
}
boolean enPassant = booleans[0];
boolean whiteRookLeft = booleans[1];
boolean whiteRookRight = booleans[2];
boolean blackRookLeft = booleans[3];
boolean blackRookRight = booleans[4];
boolean whiteKing = booleans[5];
boolean blackKing = booleans[6];
int pawnX = integers[0];
int pawnY = integers[1];
boolean king = whiteKing;
boolean rookRight = whiteRookRight;
boolean rookLeft = whiteRookLeft;
for (int i = 0; i < colNum; i++) {
for (int j = 0; j < lineNum; j++) {
Piece piece = board[j][i];
if (piece != null && piece.isWhite() == turnWhite) {
if (turnWhite) {
king = whiteKing;
rookRight = whiteRookRight;
rookLeft = whiteRookLeft;
}
else {
king = blackKing;
rookRight = blackRookRight;
rookLeft = blackRookLeft;
}
PieceType type = piece.getType();
moves = legalMoves.getMove(type, turnWhite, i, j, king, rookRight, rookLeft, enPassant, pawnX, pawnY);
if (moves.size() != 0) {
return false;
}
}
}
}
return true;
}
return false;
}
}

11
src/backend/Game.java
View File

@ -107,15 +107,8 @@ public class Game extends Thread {
this.activationAIFlags[isWhite?1:0] = !this.activationAIFlags[isWhite?1:0]; this.activationAIFlags[isWhite?1:0] = !this.activationAIFlags[isWhite?1:0];
} }
public boolean isCheckmate() {
/*public static boolean isCheckmate(boolean b) {
// TODO Auto-generated method stub
return true;
}
/*public boolean isCheckmate() {
return board.isCheckmate(); return board.isCheckmate();
}*/ }
} }

292
src/backend/MoveCalculator.java
View File

@ -58,122 +58,6 @@ public class MoveCalculator {
} }
// CALCULATE LEGAL MOVES // CALCULATE LEGAL MOVES
// return if the piece of coordinates x,y in parameter is in check or not
public boolean check(Piece[][] board2, int x, int y, boolean white) {
int i;
int j;
// verify for knight or pawn displacements
for (int n = 0; n < knightMoves.length; n++) {
i = x + knightMoves[n][0];
j = y + knightMoves[n][1];
// verify if the coordinates are still in the board
if (inBoard(i,j)) {
// verify if the location is empty, if not, verify if the piece is a knight from the opponent
if (board2[j][i] != null && board2[j][i].isWhite() != white && board2[j][i].getType() == PieceType.Knight) {
return true;
}
}
}
// verify for pawn displacements
int[][] pawn;
if (white) {
pawn = whitePawn;
}
else {
pawn = blackPawn;
}
// consider only the diagonal displacements
for (int o = 2; o < 4; o++) {
i = x + pawn[o][0];
j = y + pawn[o][1];
// verify if the coordinates are still in the board
if (inBoard(i,j)) {
// verify if the location is empty, if not, verify if the piece is a pawn from the opponent
if (board2[j][i] != null && board2[j][i].isWhite() != white && board2[j][i].getType() == PieceType.Pawn) {
return true;
}
}
}
// verify for linear displacements (from directions array)
for (int p = 0; p < directions.length; p++) {
i = x + directions[p][0];
j = y + directions[p][1];
boolean metPiece = false;
// continue until the end of the board or until a piece is met
while (inBoard(i,j) && metPiece == false) {
// if the location is not empty
if (board2[j][i] != null) {
// verify if the met piece is from the opponent
if (board2[j][i].isWhite() != white) {
// first 4 directions correspond to horizontal and vertical displacements
if (p < 4 && (board2[j][i].getType() == PieceType.Rook || board2[j][i].getType() == PieceType.Queen)) {
return true;
}
// last 4 directions correspond to diagonal displacements
else if (p > 3 && (board2[j][i].getType() == PieceType.Bishop || board2[j][i].getType() == PieceType.Queen)) {
return true;
}
}
// if the met piece is not from the opponent, this means that in this direction, the piece is protected
else {
// stop the while loop to change direction
metPiece = true;
}
}
i += directions[p][0];
j += directions[p][1];
}
}
// if no true statement has been returned, the piece is not in check
return false;
}
// create a temporary board
// return if the king would be left in check if the move in parameter is played
public boolean checkIf(Move move, int kingX, int kingY, boolean white) {
// create a copy of the actual board
Piece[][] temporaryBoard = new Piece[lineNum][colNum];
for (int i = 0; i < colNum; i++) {
for (int j = 0; j < lineNum; j++) {
Piece piece = board[j][i];
if (piece != null) {
temporaryBoard[j][i] = new Piece(piece);
}
}
}
// make the displacement in the temporary board
temporaryBoard[move.getFromY()][move.getFromX()].setX(move.getToX());
temporaryBoard[move.getFromY()][move.getFromX()].setY(move.getToY());
temporaryBoard[move.getToY()][move.getToX()] = temporaryBoard[move.getFromY()][move.getFromX()];
temporaryBoard[move.getFromY()][move.getFromX()] = null;
// verify if in this temporary board, the king is in check
return check(temporaryBoard, kingX, kingY, white);
}
// return the coordinates of the king of the color stated in parameter
public int[] findKing(boolean white) {
int[] coordinates = {-1, -1};
// iterate through all columns
for (int i = 0; i < colNum; i++) {
// iterate through all lines
for (int j = 0; j < lineNum; j++) {
// if the location is not empty, verify if it is the king from the right color
if (board[j][i] != null && board[j][i].getType() == PieceType.King && board[j][i].isWhite() == white) {
// update the coordinates to return
coordinates[0] = i;
coordinates[1] = j;
}
}
}
return coordinates;
}
// calculate linear move of the piece at x,y for the direction x+x2,y+y2 // calculate linear move of the piece at x,y for the direction x+x2,y+y2
public void linearMoves(ArrayList<int[]> moves, int x, int y, int x2, int y2, boolean white) { public void linearMoves(ArrayList<int[]> moves, int x, int y, int x2, int y2, boolean white) {
@ -182,37 +66,21 @@ public class MoveCalculator {
boolean metPiece = false; boolean metPiece = false;
// continue until the end of the board or a piece is met // continue until the end of the board or a piece is met
while (metPiece == false && inBoard(i,j)) { while (metPiece == false && inBoard(i,j)) {
Move move = new Move(x,y,i,j); moves.add(new int[]{i, j});
// locate the king to know if it would be in check if the selected piece moves
int[] coordinates = findKing(white);
// if the location is not empty // if the location is not empty
if (board[j][i] != null) { if (board[j][i] != null) {
metPiece = true; metPiece = true;
// verify if the piece met is from the opponent and that it won't let the king in check
if (board[j][i].isWhite() != white && checkIf(move,coordinates[0],coordinates[1],white) == false) {
moves.add(new int[]{i, j});
}
}
// if the location is empty
else {
// verify if the piece won't let the king in check
if (checkIf(move,coordinates[0],coordinates[1],white) == false) {
moves.add(new int[]{i, j});
}
} }
i += x2; i += x2;
j += y2; j += y2;
} }
} }
public ArrayList<int[]> getMove(PieceType type, boolean isWhite, int x, int y, boolean king, boolean rookRight, boolean rookLeft, boolean enPassant, int pawnX, int pawnY) { public ArrayList<int[]> legalMovesCalculator(ArrayList<int[]> moves, PieceType type, boolean isWhite, int x, int y) {
// create an array list that will store the legal moves // create an array list that will store the legal moves
ArrayList<int[]> moves = new ArrayList<>();
int i; int i;
int j; int j;
int[][] pieceMoves; int[][] pieceMoves;
// locate the king to later see if the displacement is possible
int[] coordinates = findKing(isWhite);
// the piece selected is a rook or the queen (it moves vertically and horizontally) // the piece selected is a rook or the queen (it moves vertically and horizontally)
if (type == PieceType.Rook || type == PieceType.Queen) { if (type == PieceType.Rook || type == PieceType.Queen) {
@ -233,58 +101,20 @@ public class MoveCalculator {
} }
// the piece selected is the king // the piece selected is the king
if (type == PieceType.King) { if (type == PieceType.King || type == PieceType.Knight) {
if (type == PieceType.Knight) {
pieceMoves = knightMoves;
}
else {
pieceMoves = kingMoves;
}
// iterates for the different possible moves // iterates for the different possible moves
for (int n = 0; n < kingMoves.length; n++) { for (int n = 0; n < 8; n++) {
i = x + kingMoves[n][0]; i = x + pieceMoves[n][0];
j = y + kingMoves[n][1]; j = y + pieceMoves[n][1];
Move move = new Move(x,y,i,j);
// verify if the coordinates are still in the board
if (inBoard(i,j)) { if (inBoard(i,j)) {
// the last 2 moves correspond to castling (right and left), so it verifies if the king and the (right or left) rook have never moved moves.add(new int[] {i, j});
if (n == 8 && king == false && rookRight == false) {
// verify if all the locations are empty and not threatened
if (board[j][i-1] == null && board[j][i] == null && check(board,i,j,isWhite) == false && check(board,i-1,j,isWhite) == false) {
moves.add(new int[] {i, j});
castlingRight = true;
}
}
// same for the other one
else if (n == 9 && king == false && rookLeft == false) {
if (board[j][i+1] == null && board[j][i] == null && board[j][i-1] == null && check(board,i,j,isWhite) == false && check(board,i+1,j,isWhite) == false) {
moves.add(new int[] {i, j});
castlingLeft = true;
}
}
// if the location is not empty, verify if the piece met is from the opponent and that it won't let the king in check
else if (n < 8 && board[j][i] != null && board[j][i].isWhite() != isWhite && check(board,i,j,isWhite) == false) {
moves.add(new int[] {i, j});
}
// if the location is empty, verify that it won't let the king in check
else if (n < 8 && board[j][i] == null && check(board,i,j,isWhite) == false){
moves.add(new int[] {i, j});
}
}
}
}
if (type == PieceType.Knight) {
// iterates for the different possible moves
for (int n = 0; n < knightMoves.length; n++) {
i = x + knightMoves[n][0];
j = y + knightMoves[n][1];
Move move = new Move(x,y,i,j);
// verify if the coordinates are still in the board
if (inBoard(i,j)) {
// if the location is not empty, verify if the piece met is from the opponent and that it won't let the king in check
if (board[j][i] != null && board[j][i].isWhite() != isWhite && checkIf(move,coordinates[0],coordinates[1],isWhite) == false) {
moves.add(new int[] {i, j});
}
// if the location is empty, verify that it won't let the king in check
else if (board[j][i] == null && checkIf(move,coordinates[0],coordinates[1],isWhite) == false){
moves.add(new int[] {i, j});
}
} }
} }
} }
@ -301,34 +131,78 @@ public class MoveCalculator {
i = x + pieceMoves[1][0]; i = x + pieceMoves[1][0];
j = y + pieceMoves[1][1]; j = y + pieceMoves[1][1];
Move move = new Move(x,y,i,j);
// verify if the location in front of the pawn is in the board and empty, and if it won't let the king in check // verify if the location in front of the pawn is in the board and empty, and if it won't let the king in check
if (inBoard(i,j) && board[j][i] == null && checkIf(move,coordinates[0],coordinates[1],isWhite) == false) { if (inBoard(i,j) && board[j][i] == null) {
moves.add(new int[] {i, j}); moves.add(new int[] {i, j});
// verify if the pawn is at its initial location // verify if the pawn is at its initial location
if (y == pieceMoves[0][0]) { if (y == pieceMoves[0][0]) {
i = x + pieceMoves[4][0]; i = x + pieceMoves[4][0];
j = y + pieceMoves[4][1]; j = y + pieceMoves[4][1];
move = new Move(x,y,i,j); if (inBoard(i,j)) {
// verify if the location is empty and won't let the king in check
if (inBoard(i,j) && board[j][i] == null && checkIf(move,coordinates[0],coordinates[1],isWhite) == false) {
moves.add(new int[] {i, j}); moves.add(new int[] {i, j});
} }
} }
} }
}
return moves;
}
public ArrayList<int[]> specialMovesCalculator(ArrayList<int[]> moves, PieceType type, boolean isWhite, int x, int y, boolean king, boolean rookRight, boolean rookLeft, boolean enPassant, int pawnX, int pawnY) {
// create an array list that will store the legal moves
Check check = new Check(this.board);
int i;
int j;
int[][] pieceMoves;
// the piece selected is the king
if (type == PieceType.King) {
// iterates for the different possible moves
for (int n = 8; n < kingMoves.length; n++) {
i = x + kingMoves[n][0];
j = y + kingMoves[n][1];
// verify if the coordinates are still in the board
if (inBoard(i,j)) {
if ((isWhite && y == 7) || (!isWhite && y == 0)) {
// the last 2 moves correspond to castling (right and left), so it verifies if the king and the (right or left) rook have never moved
if (n == 8 && king == false && rookRight == false) {
// verify if all the locations are empty and not threatened
if (board[j][i-1] == null && board[j][i] == null && check.check(board,i,j,isWhite) == false && check.check(board,i-1,j,isWhite) == false) {
moves.add(new int[] {i, j});
castlingRight = true;
}
}
// same for the other one
else if (n == 9 && king == false && rookLeft == false) {
if (board[j][i+1] == null && board[j][i] == null && board[j][i-1] == null && check.check(board,i,j,isWhite) == false && check.check(board,i+1,j,isWhite) == false) {
moves.add(new int[] {i, j});
castlingLeft = true;
}
}
}
}
}
}
// the piece selected is a pawn
if (type == PieceType.Pawn) {
// select the right color
if (isWhite == false) {
pieceMoves = blackPawn;
}
else {
pieceMoves = whitePawn;
}
// verify if there is any opponent piece in diagonal that the pawn can take // verify if there is any opponent piece in diagonal that the pawn can take
for (int n = 2; n < 4; n++) { for (int n = 2; n < 4; n++) {
i = x + pieceMoves[n][0]; i = x + pieceMoves[n][0];
j = y + pieceMoves[n][1]; j = y + pieceMoves[n][1];
move = new Move(x,y,i,j);
// verify if the location is in the board and not empty, if the piece is from the opponent and if it won't let the king in check // verify if the location is in the board and not empty, if the piece is from the opponent and if it won't let the king in check
if (inBoard(i,j) && board[j][i] != null && board[j][i].isWhite() != isWhite && checkIf(move,coordinates[0],coordinates[1],isWhite) == false) { if (inBoard(i,j) && board[j][i] != null && board[j][i].isWhite() != isWhite) {
moves.add(new int[] {i, j}); moves.add(new int[] {i, j});
} }
// if en passant is possible, and if the piece right next to the selected one (on the same line) is the pawn of the opponent that went two steps forward the previous turn // if en passant is possible, and if the piece right next to the selected one (on the same line) is the pawn of the opponent that went two steps forward the previous turn
else if(inBoard(i,j) && board[j][i] == null && enPassant == true && i == pawnX && y == pawnY && checkIf(move,coordinates[0],coordinates[1],isWhite) == false) { else if(inBoard(i,j) && board[j][i] == null && enPassant == true && i == pawnX && y == pawnY) {
moves.add(new int[] {i, j}); moves.add(new int[] {i, j});
// store the coordinates of the en passant move for later // store the coordinates of the en passant move for later
enPassantX = i; enPassantX = i;
@ -338,4 +212,38 @@ public class MoveCalculator {
} }
return moves; return moves;
} }
public ArrayList<int[]> getMove(PieceType type, boolean isWhite, int x, int y, boolean king, boolean rookRight, boolean rookLeft, boolean enPassant, int pawnX, int pawnY) {
// create an array list that will store the legal moves
ArrayList<int[]> moves = new ArrayList<>();
legalMovesCalculator(moves, type, isWhite, x, y);
specialMovesCalculator(moves, type, isWhite, x, y, king, rookRight, rookLeft, enPassant, pawnX, pawnY);
Check check = new Check(this.board);
int[] coordinates = check.findKing(isWhite);
int k = 0;
while (k < moves.size()) {
int i = moves.get(k)[0];
int j = moves.get(k)[1];
Move move = new Move(x,y,i,j);
if (board[j][i] != null && board[j][i].isWhite() == isWhite) {
moves.remove(k);
k -= 1;
}
else if (type != PieceType.King) {
if (check.checkIf(move,coordinates[0],coordinates[1],isWhite)) {
moves.remove(k);
k -= 1;
}
}
else {
if (check.check(board, i, j, isWhite)) {
moves.remove(k);
k -= 1;
}
}
k += 1;
}
return moves;
}
} }

4
src/windowInterface/MyInterface.java
View File

@ -262,7 +262,7 @@ public class MyInterface extends JFrame {
actionLabel.setText(panelDraw.isPieceAdderMode()?"Adding Piece": actionLabel.setText(panelDraw.isPieceAdderMode()?"Adding Piece":
(panelDraw.isPieceSelectorMode()?"Selecting Piece to Add": (panelDraw.isPieceSelectorMode()?"Selecting Piece to Add":
"Playing")); "Playing"));
/*if (game != null && game.isCheckmate(true)) { if (game != null && game.isCheckmate()) {
String winner = turnIsWhite ? "Black" : "White"; // since it's mate, last move won String winner = turnIsWhite ? "Black" : "White"; // since it's mate, last move won
JOptionPane.showMessageDialog(this, "Checkmate! " + winner + " wins.", "Game Over", JOptionPane.INFORMATION_MESSAGE); JOptionPane.showMessageDialog(this, "Checkmate! " + winner + " wins.", "Game Over", JOptionPane.INFORMATION_MESSAGE);
game.setDefaultSetup(); // resets the board setup game.setDefaultSetup(); // resets the board setup
@ -270,7 +270,7 @@ public class MyInterface extends JFrame {
actionLabel.setText("Game reset after checkmate"); actionLabel.setText("Game reset after checkmate");
repaint(); repaint();
return; // skip repaint below as we already called it return; // skip repaint below as we already called it
}*/ }
this.repaint(); this.repaint();
} }