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update again

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This commit is contained in:
happymeal2024 2025-05-20 09:23:13 +02:00
parent eaf0bd546e
commit 321a924555
20 changed files with 499 additions and 731 deletions
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18
chess/Main.java
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@ -1,18 +0,0 @@
package de.vivi.chess;
import de.vivi.chess.board.Board;
import de.vivi.chess.board.Field;
import de.vivi.chess.game.Game;
import de.vivi.chess.pieces.Piece;
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
Game game = new Game();
game.play();
}
}

148
chess/board/Board.java
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@ -1,148 +0,0 @@
package de.vivi.chess.board;
import de.vivi.chess.pieces.*;
import de.vivi.chess.game.Game;
public class Board {
private static final int SIZE = 8;
private final Piece[/* column */][/* row */] grid;
public Board() {
grid = new Piece[SIZE][SIZE];
setup();
}
/**
* TODO: implement
* <p>
* This method should setup the board like it is common
* for a chess game. Black is in the top two rows, white
* in the bottom two rows. "White queen, white field, black
* queen, black field".
*/
private void setup() {
grid[0][0] = new Rook(Color.BLACK, Type.ROOK, new Field(0, 0));
grid[1][0] = new Knight(Color.BLACK, Type.KNIGHT, new Field(1, 0));
grid[2][0] = new Bishop(Color.BLACK, Type.BISHOP, new Field(2, 0));
grid[3][0] = new Queen(Color.BLACK, Type.QUEEN, new Field(3, 0));
grid[4][0] = new King(Color.BLACK, Type.KING, new Field(4, 0));
grid[5][0] = new Bishop(Color.BLACK, Type.BISHOP, new Field(5, 0));
grid[6][0] = new Knight(Color.BLACK, Type.KNIGHT, new Field(6, 0));
grid[7][0] = new Rook(Color.BLACK, Type.ROOK, new Field(7, 0));
//grid[0][0] = new Rook(Color.BLACK, Type.ROOK);
// grid[1][0] = new Knight(Color.BLACK, Type.KNIGHT);
// grid[2][0] = new Bishop(Color.BLACK, Type.BISHOP);
// grid[3][0] = new Queen(Color.BLACK, Type.QUEEN);
// grid[4][0] = new King(Color.BLACK, Type.KING);
// grid[5][0] = new Bishop(Color.BLACK, Type.BISHOP);
// grid[6][0] = new Knight(Color.BLACK, Type.KNIGHT);
// grid[7][0] = new Rook(Color.BLACK, Type.ROOK);
for (int i = 0; i < SIZE; i++) {
//grid[i][1] = new Pawn(Color.BLACK, Type.PAWN);
grid[i][1] = new Pawn(Color.BLACK, Type.PAWN, new Field(i, 0));
}
grid[0][7] = new Rook(Color.WHITE, Type.ROOK, new Field(0, 7));
grid[1][7] = new Knight(Color.WHITE, Type.KNIGHT, new Field(1, 7));
grid[2][7] = new Bishop(Color.WHITE, Type.BISHOP, new Field(2, 7));
grid[3][7] = new Queen(Color.WHITE, Type.QUEEN, new Field(3, 7));
grid[4][7] = new King(Color.WHITE, Type.KING, new Field(4, 7));
grid[5][7] = new Bishop(Color.WHITE, Type.BISHOP, new Field(5, 7));
grid[6][7] = new Knight(Color.WHITE, Type.KNIGHT, new Field(6, 7));
grid[7][7] = new Rook(Color.WHITE, Type.ROOK, new Field(7, 7));
// grid[0][7] = new Rook(Color.WHITE, Type.ROOK);
// grid[1][7] = new Knight(Color.WHITE, Type.KNIGHT);
// grid[2][7] = new Bishop(Color.WHITE, Type.BISHOP);
// grid[3][7] = new Queen(Color.WHITE, Type.QUEEN);
// grid[4][7] = new King(Color.WHITE, Type.KING);
// grid[5][7] = new Bishop(Color.WHITE, Type.BISHOP);
// grid[6][7] = new Knight(Color.WHITE, Type.KNIGHT);
// grid[7][7] = new Rook(Color.WHITE, Type.ROOK);
for (int i = 0; i < SIZE; i++) {
//grid[i][6] = new Pawn(Color.WHITE, Type.PAWN);
grid[i][6] = new Pawn(Color.WHITE, Type.PAWN, new Field(i, 6));
}
}
/**
* TODO: implement
* <p>
* Moves the piece at the from field to the to field.
* Doesn't check for validity, this has to be done somewhere
* else. If a piece is already at the to field, this piece is
* just getting replaced.
*/
public void move(Field from, Field to) {
if (grid[from.getColumn()][from.getRow()] != null) {
grid[to.getColumn()][to.getRow()] = grid[from.getColumn()][from.getRow()];
grid[to.getColumn()][to.getRow()].setField(to);
grid[from.getColumn()][from.getRow()] = null;
}
}
/**
* TODO: implement
* <p>
* Returns the piece at the given field. If no piece is
* present it just returns null.
*/
public Piece getPiece(Field field) {
return grid[field.getColumn()][field.getRow()];
}
public Piece[][] getBoard() {
return grid;
}
public Piece getPiece(int column, int row) {
return grid[column][row];
}
public void setPiece(int column, int row, Piece piece) {
grid[column][row] = piece;
if (piece != null) {
piece.setField(new Field(column, row));
}
}
@Override
public String toString() {
StringBuilder result = new StringBuilder();
boolean whiteField = true;
result.append(" ");
for (int column = 0; column < SIZE; column++) {
result.append((char) ('A' + column)).append(' ');
}
result.append('\n');
for (int row = 0; row < SIZE; row++) {
result.append((char) ('1' + (char) row)).append(' ');
for (int column = 0; column < SIZE; column++) {
Piece piece = grid[column][row];
if (piece == null) {
result.append(whiteField ? '\u25a0' : '\u25a1');
} else {
result.append(piece.getSymbol());
}
result.append(' ');
whiteField = !whiteField;
}
result.append('\n');
whiteField = !whiteField;
}
return result.toString();
}
}

118
chess/board/Field.java
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@ -1,118 +0,0 @@
package de.vivi.chess.board;
import de.vivi.chess.pieces.Piece;
/**
* TODO: implement fields and constructor
* <p>
* This class contains information to identify a single field
* on the board by its column and row.
*/
public class Field {
private int column;
private int row;
public Field(int column, int row) {
this.column = column;
this.row = row;
}
/**
* TODO: implement
* <p>
* Returns a new field that represents the field at the
* column and row indices.
*/
public static Field from(int column, int row) {
return new Field(column, row);
}
/**
* TODO: implement
* <p>
* Returns a new field that represents the field represented
* by the provided string (like "A5", "E7", ...). If the string
* is not valid, because it is garbage (like "hello", "world", ...)
* or the indices are out of bounds (like "K3", "B9", ...")
* it should throw an IllegalArgument exception.
*/
public static Field fromString(String value) throws IllegalArgumentException {
try {
char[] array = value.toCharArray();
int column_ = 0;
int row_ = 0;
switch (array[0]) {
case 'A':
column_ = 0;
break;
case 'B':
column_ = 1;
break;
case 'C':
column_ = 2;
break;
case 'D':
column_ = 3;
break;
case 'E':
column_ = 4;
break;
case 'F':
column_ = 5;
break;
case 'G':
column_ = 6;
break;
case 'H':
column_ = 7;
break;
default:
System.out.println("Wrong input");
}
switch (array[1]) {
case '1':
row_ = 0;
break;
case '2':
row_ = 1;
break;
case '3':
row_ = 2;
break;
case '4':
row_ = 3;
break;
case '5':
row_ = 4;
break;
case '6':
row_ = 5;
break;
case '7':
row_ = 6;
break;
case '8':
row_ = 7;
break;
default:
System.out.println("Wrong input");
}
return from(column_, row_);
} catch (RuntimeException e) {
throw new RuntimeException(e);
}
}
public int getColumn() {
// TODO: implement
return column;
}
public int getRow() {
// TODO: implement
return row;
}
}

330
chess/game/Game.java
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@ -1,330 +0,0 @@
package de.vivi.chess.game;
import de.vivi.chess.board.Board;
import de.vivi.chess.board.Field;
import de.vivi.chess.pieces.Color;
import de.vivi.chess.pieces.King;
import de.vivi.chess.pieces.Piece;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import static de.vivi.chess.pieces.Color.BLACK;
import static de.vivi.chess.pieces.Color.WHITE;
public class Game {
private Board board;
private Color player;
private int count = 0;
private boolean whiteTurn = true;
/**
* TODO: implement
*/
public Game() {
this.board = new Board();
player = null;
}
/**
* TODO: implement
* <p>
* Starts the game and should process the game like it is
* specified inside example-output.txt.
*/
public void play() {
System.out.println("Welcome to Vivi's Chess Game!");
System.out.println(board);
player = ((count % 2) == 0) ? WHITE : BLACK;
System.out.println("It is white's turn: [from:to]");
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()) {
scanner.useDelimiter(":\\s*");
String fromString = scanner.nextLine();
char[] arrayInRange = fromString.toCharArray();
if ((arrayInRange[0] == 'A' ||
arrayInRange[0] == 'B' ||
arrayInRange[0] == 'C' ||
arrayInRange[0] == 'D' ||
arrayInRange[0] == 'E' ||
arrayInRange[0] == 'F' ||
arrayInRange[0] == 'G' ||
arrayInRange[0] == 'H' ) &&
(arrayInRange[1] == '0' ||
arrayInRange[1] == '1' ||
arrayInRange[1] == '2' ||
arrayInRange[1] == '3' ||
arrayInRange[1] == '4' ||
arrayInRange[1] == '5' ||
arrayInRange[1] == '6' ||
arrayInRange[1] == '7' ||
arrayInRange[1] == '8' )) {
StringBuilder sb=new StringBuilder(fromString);
int l=sb.length();
if (l == 2) {
String toString = scanner.nextLine();
Field from = Field.fromString(fromString);
Field to = Field.fromString(toString);
System.out.println("player == WHITE && board.getPiece(from).getColor() == WHITE " +
(player == WHITE && board.getPiece(from).getColor() == WHITE));
System.out.println("board.getPiece(from).isValidMove(board, from,to) " +
(board.getPiece(from).isValidMove(board, from,to)));
if (player == WHITE && board.getPiece(from).getColor() == WHITE) {
if (board.getPiece(from).isValidMove(board, from,to)) {
count++;
board.move(from, to);
System.out.println("Moving white " + board.getPiece(to).getType()
+ " from " + fromString + " to " + toString);
}
System.out.println(board);
} else if (player == BLACK && board.getPiece(from).getColor() == BLACK) {
if (board.getPiece(from).isValidMove(board, from,to)) {
count++;
board.move(from, to);
System.out.println("Moving black " + board.getPiece(to).getType()
+ " from " + fromString + " to " + toString);
}
System.out.println(board);
} else {
System.err.println("Illegal move, try again: ");
}
player = ((count % 2) == 0) ? WHITE : BLACK;
if (player == BLACK) {
System.out.println("It is black's turn: [from:to]");
} else {
System.out.println("It is white's turn: [from:to]");
}
} else {
System.err.println("Illegal move, try again: ");
}
} else
System.err.println("Illegal move, try again: ");
}
}
public Board getBoard() {
return this.board;
}
public void resetGame() {
this.board = new Board();
this.whiteTurn = true;
}
public Color getCurrentPlayerColor() {
return whiteTurn ? Color.WHITE : Color.BLACK;
}
private Field selectedField;
public boolean isPieceSelected() {
return selectedField != null;
}
public boolean handleSquareSelection(int row, int col) {
if (selectedField == null) {
Piece selectedPiece = board.getPiece(row, col);
if (selectedPiece != null
&& selectedPiece.getColor() == (whiteTurn ? Color.WHITE : Color.BLACK)) {
selectedField = new Field(row, col);
return false;
}
} else {
boolean moveMade = makeMove(selectedField, new Field(row, col));
selectedField = null;
return moveMade;
}
return false;
}
public boolean makeMove(Field from, Field to) {
Piece movingPiece = board.getPiece(Field.from(from.getRow(), from.getColumn()));
if (movingPiece == null || movingPiece.getColor() != (whiteTurn ? WHITE : BLACK)) {
return false;
}
if (movingPiece.isValidMove(board, movingPiece.getField(), to)) {
board.move(from, to);
whiteTurn = !whiteTurn;
return true;
}
return false;
}
public boolean isInCheck(Color kingColor) {
Field kingPosition = findKingPosition(kingColor);
for (int row = 0; row < 8; row++) {
for (int col = 0; col < 8; col++) {
Piece piece = board.getPiece(Field.from(row, col));
if (piece != null && piece.getColor() != kingColor) {
if (piece.isValidMove(board, piece.getField(), kingPosition)) {
return true;
}
}
}
}
return false;
}
private Field findKingPosition(Color color) {
for (int row = 0; row < 8; row++) {
for (int col = 0; col < 8; col++) {
Piece piece = board.getPiece(Field.from(row, col));
if (piece instanceof King && piece.getColor() == color) {
return new Field(row, col);
}
}
}
throw new RuntimeException("King not found, which should never happen.");
}
public boolean isCheckmate(Color kingColor) {
if (!isInCheck(kingColor)) {
return false;
}
Field kingPosition = findKingPosition(kingColor);
King king = (King) board.getPiece(Field.from(kingPosition.getRow(), kingPosition.getColumn()));
for (int rowOffset = -1; rowOffset <= 1; rowOffset++) {
for (int colOffset = -1; colOffset <= 1; colOffset++) {
if (rowOffset == 0 && colOffset == 0) {
continue;
}
Field newPosition = new Field(kingPosition.getRow() + rowOffset,
kingPosition.getColumn() + colOffset);
if (
isPositionOnBoard(newPosition) &&
king.isValidMove(board, king.getField() , newPosition)
&& !wouldBeInCheckAfterMove(kingColor, kingPosition, newPosition)) {
return false;
}
}
}
return true;
}
private boolean isPositionOnBoard(Field field) {
return field.getRow() >= 0 && field.getRow() < 8 &&
field.getColumn() >= 0 && field.getColumn() < 8;
}
private boolean wouldBeInCheckAfterMove(Color kingColor, Field from, Field to) {
Piece temp = board.getPiece(Field.from(to.getRow(), to.getColumn()));
board.setPiece(to.getRow(), to.getColumn(), board.getPiece(to));
board.setPiece(from.getRow(), from.getColumn(), null);
boolean inCheck = isInCheck(kingColor);
board.setPiece(from.getRow(), from.getColumn(), board.getPiece(to.getRow(), to.getColumn()));
board.setPiece(to.getRow(), to.getColumn(), temp);
return inCheck;
}
public List<Field> getLegalMovesForPieceAt(Field field) {
Piece selectedPiece = board.getPiece(field.getRow(), field.getColumn());
if (selectedPiece == null)
return new ArrayList<>();
List<Field> legalMoves = new ArrayList<>();
switch (selectedPiece.getClass().getSimpleName()) {
case "Pawn":
addPawnMoves(field, selectedPiece.getColor(), legalMoves);
break;
case "Rook":
addLineMoves(field, new int[][] { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 } }, legalMoves);
break;
case "Knight":
addSingleMoves(field, new int[][] { { 2, 1 }, { 2, -1 }, { -2, 1 }, { -2, -1 }, { 1, 2 }, { -1, 2 },
{ 1, -2 }, { -1, -2 } }, legalMoves);
break;
case "Bishop":
addLineMoves(field, new int[][] { { 1, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 } }, legalMoves);
break;
case "Queen":
addLineMoves(field, new int[][] { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 }, { 1, 1 }, { -1, -1 },
{ 1, -1 }, { -1, 1 } }, legalMoves);
break;
case "King":
addSingleMoves(field, new int[][] { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 }, { 1, 1 }, { -1, -1 },
{ 1, -1 }, { -1, 1 } }, legalMoves);
break;
}
return legalMoves;
}
private void addLineMoves(Field field, int[][] directions, List<Field> legalMoves) {
for (int[] d : directions) {
Field newPos = new Field(field.getRow() + d[0], field.getColumn() + d[1]);
while (isPositionOnBoard(newPos)) {
if (board.getPiece(newPos.getRow(), newPos.getColumn()) == null) {
legalMoves.add(new Field(newPos.getRow(), newPos.getColumn()));
newPos = new Field(newPos.getRow() + d[0], newPos.getColumn() + d[1]);
} else {
if (board.getPiece(newPos.getRow(), newPos.getColumn()).getColor() != board
.getPiece(field.getRow(), field.getColumn()).getColor()) {
legalMoves.add(newPos);
}
break;
}
}
}
}
private void addSingleMoves(Field field, int[][] moves, List<Field> legalMoves) {
for (int[] move : moves) {
Field newPos = new Field(field.getRow() + move[0], field.getColumn() + move[1]);
if (isPositionOnBoard(newPos) && (board.getPiece(newPos.getRow(), newPos.getColumn()) == null ||
board.getPiece(newPos.getRow(), newPos.getColumn()).getColor() != board
.getPiece(field.getRow(), field.getColumn()).getColor())) {
legalMoves.add(newPos);
}
}
}
private void addPawnMoves(Field field, Color color, List<Field> legalMoves) {
int direction = color == WHITE ? -1 : 1;
Field newPos = new Field(field.getRow() + direction, field.getColumn());
if (isPositionOnBoard(newPos) && board.getPiece(newPos.getRow(), newPos.getColumn()) == null) {
legalMoves.add(newPos);
}
if ((color == Color.WHITE && field.getRow() == 6)
|| (color == Color.BLACK && field.getRow() == 1)) {
newPos = new Field(field.getRow() + 2 * direction, field.getColumn());
Field intermediatePos = new Field(field.getRow() + direction, field.getColumn());
if (isPositionOnBoard(newPos) && board.getPiece(newPos.getRow(), newPos.getColumn()) == null
&& board.getPiece(intermediatePos.getRow(), intermediatePos.getColumn()) == null) {
legalMoves.add(newPos);
}
}
int[] captureCols = { field.getColumn() - 1, field.getColumn() + 1 };
for (int col : captureCols) {
newPos = new Field(field.getRow() + direction, col);
if (isPositionOnBoard(newPos) && board.getPiece(newPos.getRow(), newPos.getColumn()) != null &&
board.getPiece(newPos.getRow(), newPos.getColumn()).getColor() != color) {
legalMoves.add(newPos);
}
}
}
}

9
chess/pieces/Color.java
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@ -1,9 +0,0 @@
package de.vivi.chess.pieces;
/**
* TODO: add colors (white and black)
*/
public enum Color {
WHITE,
BLACK
}

70
chess/pieces/Piece.java
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@ -1,70 +0,0 @@
package de.vivi.chess.pieces;
import de.vivi.chess.board.Board;
import de.vivi.chess.board.Field;
public abstract class Piece {
Color color;
private Type type;
protected char symbol;
protected Field field;
protected Piece(Color color, Type type) {
this.color = color;
this.type = type;
symbol = '\u0000';
}
protected Piece(Color color, Field field) {
this.color = color;
this.field = field;
}
protected Piece(Color color, Type type, Field field) {
this.color = color;
this.type = type;
this.field = field;
}
/**
* TODO: implement
* <p>
* This method needs to be implemented in each piece by
* using inheritance. It returns true if the move from the
* from field to the to field is considered a valid move
* for the type of piece this method is called on. Otherwise
* it returns false.
*/
public abstract boolean isValidMove(Board board, Field from, Field to);
public Color getColor() {
// TODO: implement
return color;
}
public Type getType() {
// TODO: implement
return type;
}
/**
* TODO: implement
* <p>
* Use unicode symbols for the chess pieces. You can find
* them here:
* <a href="https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode">Unicode chess pieces</a>
*/
public char getSymbol() {
return symbol;
}
public Field getField() {
return field;
}
public void setField(Field field) {
this.field = field;
}
}

23
chess/pieces/Type.java
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@ -1,23 +0,0 @@
package de.vivi.chess.pieces;
/**
* TODO: add types
* <p>
* This enum should contain all chess piece types.
* The types are:
*
* - king (König)
* - queen (Dame)
* - bishop (Läufer)
* - knight (Springer/Pferd)
* - rook (Turm)
* - pawn (Bauer)
*/
public enum Type {
KING,
QUEEN,
BISHOP,
KNIGHT,
ROOK,
PAWN
}

6
chess/src/main/java/de/vivi/chess/Main.java
View File

@ -1,12 +1,18 @@
package de.vivi.chess;
import de.vivi.chess.board.Board;
import de.vivi.chess.board.Field;
import de.vivi.chess.game.Game;
import de.vivi.chess.pieces.Piece;
import java.util.Arrays;
public class Main {
public static void main(String[] args) {
Game game = new Game();
game.play();
}
}

73
chess/src/main/java/de/vivi/chess/board/Board.java
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@ -1,11 +1,11 @@
package de.vivi.chess.board;
import de.vivi.chess.pieces.Piece;
import de.vivi.chess.pieces.*;
import de.vivi.chess.game.Game;
public class Board {
private static final int SIZE = 8;
private final Piece[/* column */][/* row */] grid;
public Board() {
@ -21,8 +21,52 @@ public class Board {
* in the bottom two rows. "White queen, white field, black
* queen, black field".
*/
private void setup() {
private void setup() {
grid[0][0] = new Rook(Color.BLACK, Type.ROOK, new Field(0, 0));
grid[1][0] = new Knight(Color.BLACK, Type.KNIGHT, new Field(1, 0));
grid[2][0] = new Bishop(Color.BLACK, Type.BISHOP, new Field(2, 0));
grid[3][0] = new Queen(Color.BLACK, Type.QUEEN, new Field(3, 0));
grid[4][0] = new King(Color.BLACK, Type.KING, new Field(4, 0));
grid[5][0] = new Bishop(Color.BLACK, Type.BISHOP, new Field(5, 0));
grid[6][0] = new Knight(Color.BLACK, Type.KNIGHT, new Field(6, 0));
grid[7][0] = new Rook(Color.BLACK, Type.ROOK, new Field(7, 0));
//grid[0][0] = new Rook(Color.BLACK, Type.ROOK);
// grid[1][0] = new Knight(Color.BLACK, Type.KNIGHT);
// grid[2][0] = new Bishop(Color.BLACK, Type.BISHOP);
// grid[3][0] = new Queen(Color.BLACK, Type.QUEEN);
// grid[4][0] = new King(Color.BLACK, Type.KING);
// grid[5][0] = new Bishop(Color.BLACK, Type.BISHOP);
// grid[6][0] = new Knight(Color.BLACK, Type.KNIGHT);
// grid[7][0] = new Rook(Color.BLACK, Type.ROOK);
for (int i = 0; i < SIZE; i++) {
//grid[i][1] = new Pawn(Color.BLACK, Type.PAWN);
grid[i][1] = new Pawn(Color.BLACK, Type.PAWN, new Field(i, 0));
}
grid[0][7] = new Rook(Color.WHITE, Type.ROOK, new Field(0, 7));
grid[1][7] = new Knight(Color.WHITE, Type.KNIGHT, new Field(1, 7));
grid[2][7] = new Bishop(Color.WHITE, Type.BISHOP, new Field(2, 7));
grid[3][7] = new Queen(Color.WHITE, Type.QUEEN, new Field(3, 7));
grid[4][7] = new King(Color.WHITE, Type.KING, new Field(4, 7));
grid[5][7] = new Bishop(Color.WHITE, Type.BISHOP, new Field(5, 7));
grid[6][7] = new Knight(Color.WHITE, Type.KNIGHT, new Field(6, 7));
grid[7][7] = new Rook(Color.WHITE, Type.ROOK, new Field(7, 7));
// grid[0][7] = new Rook(Color.WHITE, Type.ROOK);
// grid[1][7] = new Knight(Color.WHITE, Type.KNIGHT);
// grid[2][7] = new Bishop(Color.WHITE, Type.BISHOP);
// grid[3][7] = new Queen(Color.WHITE, Type.QUEEN);
// grid[4][7] = new King(Color.WHITE, Type.KING);
// grid[5][7] = new Bishop(Color.WHITE, Type.BISHOP);
// grid[6][7] = new Knight(Color.WHITE, Type.KNIGHT);
// grid[7][7] = new Rook(Color.WHITE, Type.ROOK);
for (int i = 0; i < SIZE; i++) {
//grid[i][6] = new Pawn(Color.WHITE, Type.PAWN);
grid[i][6] = new Pawn(Color.WHITE, Type.PAWN, new Field(i, 6));
}
}
/**
@ -34,7 +78,11 @@ public class Board {
* just getting replaced.
*/
public void move(Field from, Field to) {
if (grid[from.getColumn()][from.getRow()] != null) {
grid[to.getColumn()][to.getRow()] = grid[from.getColumn()][from.getRow()];
grid[to.getColumn()][to.getRow()].setField(to);
grid[from.getColumn()][from.getRow()] = null;
}
}
/**
@ -44,7 +92,22 @@ public class Board {
* present it just returns null.
*/
public Piece getPiece(Field field) {
return null;
return grid[field.getColumn()][field.getRow()];
}
public Piece[][] getBoard() {
return grid;
}
public Piece getPiece(int column, int row) {
return grid[column][row];
}
public void setPiece(int column, int row, Piece piece) {
grid[column][row] = piece;
if (piece != null) {
piece.setField(new Field(column, row));
}
}
@Override

83
chess/src/main/java/de/vivi/chess/board/Field.java
View File

@ -1,5 +1,7 @@
package de.vivi.chess.board;
import de.vivi.chess.pieces.Piece;
/**
* TODO: implement fields and constructor
* <p>
@ -8,6 +10,14 @@ package de.vivi.chess.board;
*/
public class Field {
private int column;
private int row;
public Field(int column, int row) {
this.column = column;
this.row = row;
}
/**
* TODO: implement
* <p>
@ -15,7 +25,7 @@ public class Field {
* column and row indices.
*/
public static Field from(int column, int row) {
return null;
return new Field(column, row);
}
/**
@ -28,16 +38,81 @@ public class Field {
* it should throw an IllegalArgument exception.
*/
public static Field fromString(String value) throws IllegalArgumentException {
return null;
try {
char[] array = value.toCharArray();
int column_ = 0;
int row_ = 0;
switch (array[0]) {
case 'A':
column_ = 0;
break;
case 'B':
column_ = 1;
break;
case 'C':
column_ = 2;
break;
case 'D':
column_ = 3;
break;
case 'E':
column_ = 4;
break;
case 'F':
column_ = 5;
break;
case 'G':
column_ = 6;
break;
case 'H':
column_ = 7;
break;
default:
System.out.println("Wrong input");
}
switch (array[1]) {
case '1':
row_ = 0;
break;
case '2':
row_ = 1;
break;
case '3':
row_ = 2;
break;
case '4':
row_ = 3;
break;
case '5':
row_ = 4;
break;
case '6':
row_ = 5;
break;
case '7':
row_ = 6;
break;
case '8':
row_ = 7;
break;
default:
System.out.println("Wrong input");
}
return from(column_, row_);
} catch (RuntimeException e) {
throw new RuntimeException(e);
}
}
public int getColumn() {
// TODO: implement
return -1;
return column;
}
public int getRow() {
// TODO: implement
return -1;
return row;
}
}

307
chess/src/main/java/de/vivi/chess/game/Game.java
View File

@ -1,19 +1,30 @@
package de.vivi.chess.game;
import de.vivi.chess.board.Board;
import de.vivi.chess.board.Field;
import de.vivi.chess.pieces.Color;
import de.vivi.chess.pieces.King;
import de.vivi.chess.pieces.Piece;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import static de.vivi.chess.pieces.Color.BLACK;
import static de.vivi.chess.pieces.Color.WHITE;
public class Game {
private final Board board;
private Board board;
private Color player;
private int count = 0;
private boolean whiteTurn = true;
/**
* TODO: implement
*/
public Game() {
board = null;
this.board = new Board();
player = null;
}
@ -24,6 +35,296 @@ public class Game {
* specified inside example-output.txt.
*/
public void play() {
System.out.println("Welcome to Vivi's Chess Game!");
System.out.println(board);
player = ((count % 2) == 0) ? WHITE : BLACK;
System.out.println("It is white's turn: [from:to]");
Scanner scanner = new Scanner(System.in);
while (scanner.hasNext()) {
scanner.useDelimiter(":\\s*");
String fromString = scanner.nextLine();
char[] arrayInRange = fromString.toCharArray();
if ((arrayInRange[0] == 'A' ||
arrayInRange[0] == 'B' ||
arrayInRange[0] == 'C' ||
arrayInRange[0] == 'D' ||
arrayInRange[0] == 'E' ||
arrayInRange[0] == 'F' ||
arrayInRange[0] == 'G' ||
arrayInRange[0] == 'H' ) &&
(arrayInRange[1] == '0' ||
arrayInRange[1] == '1' ||
arrayInRange[1] == '2' ||
arrayInRange[1] == '3' ||
arrayInRange[1] == '4' ||
arrayInRange[1] == '5' ||
arrayInRange[1] == '6' ||
arrayInRange[1] == '7' ||
arrayInRange[1] == '8' )) {
StringBuilder sb=new StringBuilder(fromString);
int l=sb.length();
if (l == 2) {
String toString = scanner.nextLine();
Field from = Field.fromString(fromString);
Field to = Field.fromString(toString);
System.out.println("player == WHITE && board.getPiece(from).getColor() == WHITE " +
(player == WHITE && board.getPiece(from).getColor() == WHITE));
System.out.println("board.getPiece(from).isValidMove(board, from,to) " +
(board.getPiece(from).isValidMove(board, from,to)));
if (player == WHITE && board.getPiece(from).getColor() == WHITE) {
if (board.getPiece(from).isValidMove(board, from,to)) {
count++;
board.move(from, to);
System.out.println("Moving white " + board.getPiece(to).getType()
+ " from " + fromString + " to " + toString);
}
System.out.println(board);
} else if (player == BLACK && board.getPiece(from).getColor() == BLACK) {
if (board.getPiece(from).isValidMove(board, from,to)) {
count++;
board.move(from, to);
System.out.println("Moving black " + board.getPiece(to).getType()
+ " from " + fromString + " to " + toString);
}
System.out.println(board);
} else {
System.err.println("Illegal move, try again: ");
}
player = ((count % 2) == 0) ? WHITE : BLACK;
if (player == BLACK) {
System.out.println("It is black's turn: [from:to]");
} else {
System.out.println("It is white's turn: [from:to]");
}
} else {
System.err.println("Illegal move, try again: ");
}
} else
System.err.println("Illegal move, try again: ");
}
}
public Board getBoard() {
return this.board;
}
public void resetGame() {
this.board = new Board();
this.whiteTurn = true;
}
public Color getCurrentPlayerColor() {
return whiteTurn ? Color.WHITE : Color.BLACK;
}
private Field selectedField;
public boolean isPieceSelected() {
return selectedField != null;
}
public boolean handleSquareSelection(int row, int col) {
if (selectedField == null) {
Piece selectedPiece = board.getPiece(row, col);
if (selectedPiece != null
&& selectedPiece.getColor() == (whiteTurn ? Color.WHITE : Color.BLACK)) {
selectedField = new Field(row, col);
return false;
}
} else {
boolean moveMade = makeMove(selectedField, new Field(row, col));
selectedField = null;
return moveMade;
}
return false;
}
public boolean makeMove(Field from, Field to) {
Piece movingPiece = board.getPiece(Field.from(from.getRow(), from.getColumn()));
if (movingPiece == null || movingPiece.getColor() != (whiteTurn ? WHITE : BLACK)) {
return false;
}
if (movingPiece.isValidMove(board, movingPiece.getField(), to)) {
board.move(from, to);
whiteTurn = !whiteTurn;
return true;
}
return false;
}
public boolean isInCheck(Color kingColor) {
Field kingPosition = findKingPosition(kingColor);
for (int row = 0; row < 8; row++) {
for (int col = 0; col < 8; col++) {
Piece piece = board.getPiece(Field.from(row, col));
if (piece != null && piece.getColor() != kingColor) {
if (piece.isValidMove(board, piece.getField(), kingPosition)) {
return true;
}
}
}
}
return false;
}
private Field findKingPosition(Color color) {
for (int row = 0; row < 8; row++) {
for (int col = 0; col < 8; col++) {
Piece piece = board.getPiece(Field.from(row, col));
if (piece instanceof King && piece.getColor() == color) {
return new Field(row, col);
}
}
}
throw new RuntimeException("King not found, which should never happen.");
}
public boolean isCheckmate(Color kingColor) {
if (!isInCheck(kingColor)) {
return false;
}
Field kingPosition = findKingPosition(kingColor);
King king = (King) board.getPiece(Field.from(kingPosition.getRow(), kingPosition.getColumn()));
for (int rowOffset = -1; rowOffset <= 1; rowOffset++) {
for (int colOffset = -1; colOffset <= 1; colOffset++) {
if (rowOffset == 0 && colOffset == 0) {
continue;
}
Field newPosition = new Field(kingPosition.getRow() + rowOffset,
kingPosition.getColumn() + colOffset);
if (
isPositionOnBoard(newPosition) &&
king.isValidMove(board, king.getField() , newPosition)
&& !wouldBeInCheckAfterMove(kingColor, kingPosition, newPosition)) {
return false;
}
}
}
return true;
}
private boolean isPositionOnBoard(Field field) {
return field.getRow() >= 0 && field.getRow() < 8 &&
field.getColumn() >= 0 && field.getColumn() < 8;
}
private boolean wouldBeInCheckAfterMove(Color kingColor, Field from, Field to) {
Piece temp = board.getPiece(Field.from(to.getRow(), to.getColumn()));
board.setPiece(to.getRow(), to.getColumn(), board.getPiece(to));
board.setPiece(from.getRow(), from.getColumn(), null);
boolean inCheck = isInCheck(kingColor);
board.setPiece(from.getRow(), from.getColumn(), board.getPiece(to.getRow(), to.getColumn()));
board.setPiece(to.getRow(), to.getColumn(), temp);
return inCheck;
}
public List<Field> getLegalMovesForPieceAt(Field field) {
Piece selectedPiece = board.getPiece(field.getRow(), field.getColumn());
if (selectedPiece == null)
return new ArrayList<>();
List<Field> legalMoves = new ArrayList<>();
switch (selectedPiece.getClass().getSimpleName()) {
case "Pawn":
addPawnMoves(field, selectedPiece.getColor(), legalMoves);
break;
case "Rook":
addLineMoves(field, new int[][] { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 } }, legalMoves);
break;
case "Knight":
addSingleMoves(field, new int[][] { { 2, 1 }, { 2, -1 }, { -2, 1 }, { -2, -1 }, { 1, 2 }, { -1, 2 },
{ 1, -2 }, { -1, -2 } }, legalMoves);
break;
case "Bishop":
addLineMoves(field, new int[][] { { 1, 1 }, { -1, -1 }, { 1, -1 }, { -1, 1 } }, legalMoves);
break;
case "Queen":
addLineMoves(field, new int[][] { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 }, { 1, 1 }, { -1, -1 },
{ 1, -1 }, { -1, 1 } }, legalMoves);
break;
case "King":
addSingleMoves(field, new int[][] { { 1, 0 }, { -1, 0 }, { 0, 1 }, { 0, -1 }, { 1, 1 }, { -1, -1 },
{ 1, -1 }, { -1, 1 } }, legalMoves);
break;
}
return legalMoves;
}
private void addLineMoves(Field field, int[][] directions, List<Field> legalMoves) {
for (int[] d : directions) {
Field newPos = new Field(field.getRow() + d[0], field.getColumn() + d[1]);
while (isPositionOnBoard(newPos)) {
if (board.getPiece(newPos.getRow(), newPos.getColumn()) == null) {
legalMoves.add(new Field(newPos.getRow(), newPos.getColumn()));
newPos = new Field(newPos.getRow() + d[0], newPos.getColumn() + d[1]);
} else {
if (board.getPiece(newPos.getRow(), newPos.getColumn()).getColor() != board
.getPiece(field.getRow(), field.getColumn()).getColor()) {
legalMoves.add(newPos);
}
break;
}
}
}
}
private void addSingleMoves(Field field, int[][] moves, List<Field> legalMoves) {
for (int[] move : moves) {
Field newPos = new Field(field.getRow() + move[0], field.getColumn() + move[1]);
if (isPositionOnBoard(newPos) && (board.getPiece(newPos.getRow(), newPos.getColumn()) == null ||
board.getPiece(newPos.getRow(), newPos.getColumn()).getColor() != board
.getPiece(field.getRow(), field.getColumn()).getColor())) {
legalMoves.add(newPos);
}
}
}
private void addPawnMoves(Field field, Color color, List<Field> legalMoves) {
int direction = color == WHITE ? -1 : 1;
Field newPos = new Field(field.getRow() + direction, field.getColumn());
if (isPositionOnBoard(newPos) && board.getPiece(newPos.getRow(), newPos.getColumn()) == null) {
legalMoves.add(newPos);
}
if ((color == Color.WHITE && field.getRow() == 6)
|| (color == Color.BLACK && field.getRow() == 1)) {
newPos = new Field(field.getRow() + 2 * direction, field.getColumn());
Field intermediatePos = new Field(field.getRow() + direction, field.getColumn());
if (isPositionOnBoard(newPos) && board.getPiece(newPos.getRow(), newPos.getColumn()) == null
&& board.getPiece(intermediatePos.getRow(), intermediatePos.getColumn()) == null) {
legalMoves.add(newPos);
}
}
int[] captureCols = { field.getColumn() - 1, field.getColumn() + 1 };
for (int col : captureCols) {
newPos = new Field(field.getRow() + direction, col);
if (isPositionOnBoard(newPos) && board.getPiece(newPos.getRow(), newPos.getColumn()) != null &&
board.getPiece(newPos.getRow(), newPos.getColumn()).getColor() != color) {
legalMoves.add(newPos);
}
}
}
}

0
chess/pieces/Bishop.java → chess/src/main/java/de/vivi/chess/pieces/Bishop.java
View File

2
chess/src/main/java/de/vivi/chess/pieces/Color.java
View File

@ -4,4 +4,6 @@ package de.vivi.chess.pieces;
* TODO: add colors (white and black)
*/
public enum Color {
WHITE,
BLACK
}

0
chess/pieces/King.java → chess/src/main/java/de/vivi/chess/pieces/King.java
View File

0
chess/pieces/Knight.java → chess/src/main/java/de/vivi/chess/pieces/Knight.java
View File

0
chess/pieces/Pawn.java → chess/src/main/java/de/vivi/chess/pieces/Pawn.java
View File

37
chess/src/main/java/de/vivi/chess/pieces/Piece.java
View File

@ -5,6 +5,28 @@ import de.vivi.chess.board.Field;
public abstract class Piece {
Color color;
private Type type;
protected char symbol;
protected Field field;
protected Piece(Color color, Type type) {
this.color = color;
this.type = type;
symbol = '\u0000';
}
protected Piece(Color color, Field field) {
this.color = color;
this.field = field;
}
protected Piece(Color color, Type type, Field field) {
this.color = color;
this.type = type;
this.field = field;
}
/**
* TODO: implement
* <p>
@ -16,14 +38,15 @@ public abstract class Piece {
*/
public abstract boolean isValidMove(Board board, Field from, Field to);
public Color getColor() {
// TODO: implement
return null;
return color;
}
public Type getType() {
// TODO: implement
return null;
return type;
}
/**
@ -34,6 +57,14 @@ public abstract class Piece {
* <a href="https://en.wikipedia.org/wiki/Chess_symbols_in_Unicode">Unicode chess pieces</a>
*/
public char getSymbol() {
return 0;
return symbol;
}
public Field getField() {
return field;
}
public void setField(Field field) {
this.field = field;
}
}

0
chess/pieces/Queen.java → chess/src/main/java/de/vivi/chess/pieces/Queen.java
View File

0
chess/pieces/Rook.java → chess/src/main/java/de/vivi/chess/pieces/Rook.java
View File

6
chess/src/main/java/de/vivi/chess/pieces/Type.java
View File

@ -14,4 +14,10 @@ package de.vivi.chess.pieces;
* - pawn (Bauer)
*/
public enum Type {
KING,
QUEEN,
BISHOP,
KNIGHT,
ROOK,
PAWN
}