undo last move

src/Main.java

@@ -12,7 +12,7 @@ public class Main {
 		// testing : 
 		Board testBoard = new Board(8, 8);
 		testBoard.populateBoard();
-		System.out.println(testBoard.toString());
+		//System.out.println(testBoard.toString());
 		// launches graphical interface : 
 		MyInterface mjf = new MyInterface();
 		mjf.setVisible(true);

src/backend/Board.java

@@ -24,6 +24,7 @@ public class Board {
 	private boolean blackKing;
 	private boolean castlingRight;
 	private boolean castlingLeft;
+	ArrayList<String> states;
 
 	// CONSTRUCTOR
  	public Board(int colNum, int lineNum) {
@@ -48,6 +49,7 @@ public class Board {
 		blackKing = false;
 		castlingRight = false;
         castlingLeft = false;
+        states = new ArrayList<>();
   	}
 
  	// GETTERS
@@ -85,6 +87,7 @@ public class Board {
 		blackRookRight = false;
 		whiteKing = false;
 		blackKing = false;
+		states = new ArrayList<>();
 	}
 	
 	public void setPiece(boolean isWhite, PieceType type, int x, int y) {
@@ -110,6 +113,7 @@ public class Board {
 				setPiece(white, PieceType.King, 4, i);
 			}
 		}
+		states.add(toString());
 	}
 	
 	public void cleanBoard() {
@@ -144,6 +148,11 @@ public class Board {
 			}
 			str += "\n";
 		}
+		String turn = "B";
+		if (isTurnWhite()) {
+			turn = "W";
+		}
+		str += turn;
 		return str;
 	}
 	
@@ -290,11 +299,7 @@ public class Board {
 	/* saving-loading feature :*/
 
 	public String[] toFileRep() {
-		String turn = "B";
-		if (isTurnWhite()) {
-			turn = "W";
-		}
-		String myFile = toString() + turn;
+		String myFile = toString();
 		String[] myArray = myFile.split("\n");
 		return myArray;
 	}
@@ -303,24 +308,32 @@ public class Board {
 	    this.colNum = 8;
 	    this.lineNum = 8;
 	    this.board = new Piece[lineNum][colNum];
+	    this.x = -1;
+		this.y = -1;
+		//this.turns = turns;
 	    
 	    String[] line;
 	    boolean white;
-	    for (int i = 0; i < colNum; i++) {
-	        line = array[i].split(",");
+	    
 	    for (int j = 0; j < lineNum; j++) {
-	            if (line[j] != "  ") {
+	        line = array[j].split(",");
+	        for (int i = 0; i < colNum; i++) {
+	            if (line[i] != "  ") {
 	            	white = false;
-	            	if (line[j].charAt(0) == 'W') {
+	            	if (line[i].charAt(0) == 'W') {
 	            		white = true;
 	            	}
-	                setPiece(white, PieceType.fromSummary(line[j].charAt(1)), j, i);
+	            	Piece piece = new Piece(white, PieceType.fromSummary(line[i].charAt(1)), i, j);
+	                board[j][i] = new Piece(piece);
 	            }
 	        }
 	    }
 	    if (array[lineNum] == "B") {
 	    	whiteTurn = false;
 	    }
+	    else {
+	    	whiteTurn = true;
+	    }
 	}
 
 	
@@ -358,12 +371,50 @@ public class Board {
 	} 
 
 	public void undoLastMove() {
-		//TODO
+		if (this.turns > 0) {
+			states.remove(this.turns);
+			this.turns = turns - 1;
+			this.board = new Piece[lineNum][colNum];
+		    this.x = -1;
+			this.y = -1;
+			
+			String[] undo = states.get(turns).split("\n");
+		    String[] line;
+		    boolean white;
+		    
+		    for (int j = 0; j < colNum; j++) {
+		        line = undo[j].split(",");
+		        for (int i = 0; i < lineNum; i++) {
+		            if (line[i].charAt(0) != ' ') {
+		            	white = false;
+		            	if (line[i].charAt(0) == 'W') {
+		            		white = true;
+		            	}
+		            	Piece piece = new Piece(white, PieceType.fromSummary(line[i].charAt(1)), i, j);
+		                board[j][i] = new Piece(piece);
+		            }
+		        }
+		    }
+		    if (undo[lineNum].charAt(0) == 'B' || turns == 0) {
+		    	this.whiteTurn = true;
+		    }
+		    else {
+		    	this.whiteTurn = false;
+		    }
+		}
 		
 	}
 
 	public Board(Board board) {
-		//TODO
+		Piece[][] newBoard = new Piece[lineNum][colNum];
+		for (int i = 0; i < colNum; i++) {
+			for (int j = 0; j < lineNum; j++) {
+				Piece piece = board.getPieceAt(i,j);
+				if (piece != null) {
+					newBoard[j][i] = new Piece(piece);
+				}
+			}
+		}
 	}
 	
 	public void playMove(Move move) {
@@ -371,6 +422,7 @@ public class Board {
 		board[move.getFromY()][move.getFromX()].setY(move.getToY());
 		board[move.getToY()][move.getToX()] = board[move.getFromY()][move.getFromX()];
 		board[move.getFromY()][move.getFromX()] = null;
+		this.states.add(toString());
 	}
 
 }

src/backend/MoveCalculator.java

@@ -141,8 +141,9 @@ public class MoveCalculator {
 		Piece[][] temporaryBoard = new Piece[lineNum][colNum];
 		for (int i = 0; i < colNum; i++) {
 			for (int j = 0; j < lineNum; j++) {
-				if (board1[j][i] != null) {
-					temporaryBoard[j][i] = new Piece(board1[j][i]);
+				Piece piece = board1[j][i];
+				if (piece != null) {
+					temporaryBoard[j][i] = new Piece(piece);
 				}
 			}
 		}
@@ -231,20 +232,13 @@ public class MoveCalculator {
 			}
 		}
 		
-		// the piece selected is a knight or the king (it has a precise number of possible moves)
-		if (type == PieceType.Knight || type == PieceType.King) {
-			
-			if (type == PieceType.Knight) {
-				pieceMoves = knightMoves;
-			}
-			else {
-				pieceMoves = kingMoves;
-			}
+		// the piece selected is the king 
+		if (type == PieceType.King) {
 			
 			// iterates for the different possible moves
-			for (int n = 0; n < pieceMoves.length; n++) {
-				i = x + pieceMoves[n][0];
-				j = y + pieceMoves[n][1];
+			for (int n = 0; n < kingMoves.length; n++) {
+				i = x + kingMoves[n][0];
+				j = y + kingMoves[n][1];
 				Move move = new Move(x,y,i,j);
 				// verify if the coordinates are still in the board
 				if (inBoard(i,j)) {
@@ -264,11 +258,31 @@ public class MoveCalculator {
 						}
 					}
 					// 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 && board1[j][i] != null && board1[j][i].isWhite() != isWhite && checkIf(move,coordinates[0],coordinates[1],isWhite) == false) {
+					else if (n < 8 && board1[j][i] != null && board1[j][i].isWhite() != isWhite && check(board1,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 && board1[j][i] == null && checkIf(move,coordinates[0],coordinates[1],isWhite) == false){
+					else if (n < 8 && board1[j][i] == null && check(board1,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 (board1[j][i] != null && board1[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 (board1[j][i] == null && checkIf(move,coordinates[0],coordinates[1],isWhite) == false){
 						moves.add(new int[] {i, j});
 					}
 				}

src/backend/Piece.java

@@ -38,11 +38,11 @@ public class Piece {
 		return this.isWhite;
 	}
 	
-	public Piece(Piece other) {
-        this.isWhite = other.isWhite;
-        this.type = other.type;
-        this.x = other.x;
-        this.y = other.y;
+	public Piece(Piece piece) {
+        this.isWhite = piece.isWhite;
+        this.type = piece.type;
+        this.x = piece.x;
+        this.y = piece.y;
     }
 	
 }