/**
* $Id: ChessBoard.java 152 2008-04-27 02:04:31Z mbroeker $
* $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/chessboard/ChessBoard.java $
*/
package org.homelinux.largo.games.board.chessboard;
import java.awt.Image;
import org.homelinux.largo.games.board.Board;
import org.homelinux.largo.games.board.Piece;
import org.homelinux.largo.utils.ImgComponent;
public class ChessBoard extends Board {
static final long serialVersionUID = 140208;
static final int ROOK = 1;
static final int KNIGHT = 2;
static final int BISHOP = 3;
static final int QUEEN = 4;
static final int KING = 5;
static final int PAWN = 6;
final Piece white_queen = new Piece(new ImgComponent("images/white_queen.png").getImage(), "white", QUEEN, 90);
final Piece black_queen = new Piece(new ImgComponent("images/black_queen.png").getImage(), "black", QUEEN, 90);
boolean white_rochades_small;
boolean white_rochades_big;
boolean black_rochades_small;
boolean black_rochades_big;
void initBoard() {
add(new ImgComponent("images/black_rook.png").getImage(), 0, "black", ROOK);
add(new ImgComponent("images/black_knight.png").getImage(), 1, "black", KNIGHT);
add(new ImgComponent("images/black_bishop.png").getImage(), 2, "black", BISHOP);
add(new ImgComponent("images/black_queen.png").getImage(), 3, "black", QUEEN);
add(new ImgComponent("images/black_king.png").getImage(), 4, "black", KING);
add(new ImgComponent("images/black_bishop.png").getImage(), 5, "black", BISHOP);
add(new ImgComponent("images/black_knight.png").getImage(), 6, "black", KNIGHT);
add(new ImgComponent("images/black_rook.png").getImage(), 7, "black", ROOK);
for (int i = 0; i < 8; i++)
add(new ImgComponent("images/black_pawn.png").getImage(), 8 + i, "black", PAWN);
add(new ImgComponent("images/white_rook.png").getImage(), 56, "white", ROOK);
add(new ImgComponent("images/white_knight.png").getImage(), 57, "white", KNIGHT);
add(new ImgComponent("images/white_bishop.png").getImage(), 58, "white", BISHOP);
add(new ImgComponent("images/white_queen.png").getImage(), 59, "white", QUEEN);
add(new ImgComponent("images/white_king.png").getImage(), 60, "white", KING);
add(new ImgComponent("images/white_bishop.png").getImage(), 61, "white", BISHOP);
add(new ImgComponent("images/white_knight.png").getImage(), 62, "white", KNIGHT);
add(new ImgComponent("images/white_rook.png").getImage(), 63, "white", ROOK);
for (int i = 0; i < 8; i++)
add(new ImgComponent("images/white_pawn.png").getImage(), 55 - i, "white", PAWN);
}
/**
* The init method initializes a complete chess board with figures and a
* history.
*/
public void init() {
super.init();
initBoard();
board_pieces = getPieces();
repaint();
}
public ChessBoard(int w, int h) {
super(w, h);
}
void add(Image img, int i, String c, int t) {
int v = 0;
switch (t) {
case ROOK:
v = 80;
break;
case KNIGHT:
v = 30;
break;
case BISHOP:
v = 30;
break;
case QUEEN:
v = 90;
break;
case KING:
v = 120;
break;
case PAWN:
v = 10;
break;
}
setPiece(i, new Piece(img, c, t, v));
}
/**
* returns true, when the white king is at pieces[i]
*/
public boolean isWhiteKing(int i) {
if (isWhite(i) && getType(i) == KING)
return true;
return false;
}
/**
* returns true, when the black king is at pieces[i]
*/
public boolean isBlackKing(int i) {
if (isBlack(i) && getType(i) == KING)
return true;
return false;
}
/**
* Returns the score of the current position Every field controlled by
* [color] gives one point A King, controlled by [color], gives 10 extra
* points
*/
public int controls(String color) {
int t, o;
int value = 0;
for (o = 0; o < 64; o++) {
if (color.equals(getColor(o))) {
for (t = 0; t < 64; t++) {
if (validMove(t, o)) {
if (getType(t) == KING)
value += 10;
value++;
}
}
}
}
return value;
}
/**
* Checks, wether this move is possible or not.
*/
public boolean validMove(int t, int o) {
int steps;
int rows;
int dx;
/* Must be here */
white_rochades_small = false;
white_rochades_big = false;
black_rochades_small = false;
black_rochades_big = false;
if (t == o)
return false;
if (isSamePiece(t, o))
return false;
if (getType(o) == EMPTY)
return false;
/*
* 00 01 02 03 04 05 06 07
* 08 09 10 11 12 13 14 15
* 16 17 18 19 20 21 22 23
* 24 25 26 27 28 29 30 31
* 32 33 34 35 36 37 38 39
* 40 41 42 43 44 45 46 47
* 48 49 50 51 52 53 54 55
* 56 57 58 59 60 61 62 63
*/
steps = Math.abs(t - o);
rows = Math.abs(t / 8 - o / 8);
switch (getType(o)) {
case ROOK:
if (steps < 8 && rows == 0) {
if (t > o)
for (dx = o + 1; dx < t; dx++) {
if (getColor(dx) != null) {
return false;
}
}
else
for (dx = o - 1; dx > t; dx--) {
if (getColor(dx) != null) {
return false;
}
}
return true;
}
if (steps % 8 == 0) {
if (t > o) {
for (dx = o + 8; dx < t; dx += 8) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 8; dx > t; dx -= 8) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 8 && rows == 1)
return true;
if (steps == 16 && rows == 2)
return true;
if (steps == 24 && rows == 3)
return true;
if (steps == 32 && rows == 4)
return true;
if (steps == 40 && rows == 5)
return true;
if (steps == 48 && rows == 6)
return true;
if (steps == 56 && rows == 7)
return true;
}
break;
case KNIGHT:
/* works fine */
if (steps == 6 && rows == 1)
return true;
if (steps == 10 && rows == 1)
return true;
if (steps == 15 && rows == 2)
return true;
if (steps == 17 && rows == 2)
return true;
break;
case BISHOP:
if (steps % 7 == 0) {
if (t > o) {
for (dx = o + 7; dx < t; dx += 7) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 7; dx > t; dx -= 7) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 7 && rows == 1)
return true;
if (steps == 14 && rows == 2)
return true;
if (steps == 21 && rows == 3)
return true;
if (steps == 28 && rows == 4)
return true;
if (steps == 35 && rows == 5)
return true;
if (steps == 42 && rows == 6)
return true;
if (steps == 49 && rows == 7)
return true;
}
if (steps % 9 == 0) {
if (t > o) {
for (dx = o + 9; dx < t; dx += 9) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 9; dx > t; dx -= 9) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 9 && rows == 1)
return true;
if (steps == 18 && rows == 2)
return true;
if (steps == 27 && rows == 3)
return true;
if (steps == 36 && rows == 4)
return true;
if (steps == 45 && rows == 5)
return true;
if (steps == 54 && rows == 6)
return true;
if (steps == 63 && rows == 7)
return true;
}
break;
case QUEEN:
if (steps < 8 && rows == 0) {
if (t > o)
for (dx = o + 1; dx < t; dx++) {
if (getColor(dx) != null)
return false;
}
else
for (dx = o - 1; dx > t; dx--) {
if (getColor(dx) != null)
return false;
}
return true;
}
if (steps % 8 == 0) {
if (t > o) {
for (dx = o + 8; dx < t; dx += 8) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 8; dx > t; dx -= 8) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 8 && rows == 1)
return true;
if (steps == 16 && rows == 2)
return true;
if (steps == 24 && rows == 3)
return true;
if (steps == 32 && rows == 4)
return true;
if (steps == 40 && rows == 5)
return true;
if (steps == 48 && rows == 6)
return true;
if (steps == 56 && rows == 7)
return true;
}
if (steps % 7 == 0) {
if (t > o) {
for (dx = o + 7; dx < t; dx += 7) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 7; dx > t; dx -= 7) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 7 && rows == 1)
return true;
if (steps == 14 && rows == 2)
return true;
if (steps == 21 && rows == 3)
return true;
if (steps == 28 && rows == 4)
return true;
if (steps == 35 && rows == 5)
return true;
if (steps == 42 && rows == 6)
return true;
if (steps == 49 && rows == 7)
return true;
}
if (steps % 9 == 0) {
if (t > o) {
for (dx = o + 9; dx < t; dx += 9) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 9; dx > t; dx -= 9) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 9 && rows == 1)
return true;
if (steps == 18 && rows == 2)
return true;
if (steps == 27 && rows == 3)
return true;
if (steps == 36 && rows == 4)
return true;
if (steps == 45 && rows == 5)
return true;
if (steps == 54 && rows == 6)
return true;
if (steps == 63 && rows == 7)
return true;
}
break;
case KING:
if ((steps == 1) && (rows == 0))
return true;
if ((steps == 8) && (rows == 1))
return true;
if ((steps == 7) && (rows == 1))
return true;
if ((steps == 9) && (rows == 1))
return true;
if ((steps == 2) && (rows == 0)) {
if (isWhiteKing(o)) { /* White: Rochade */
if (isWhiteKing(60) && isEmpty(61) && isEmpty(62) && (t == 62)) {
if ((getType(63) == ROOK) && isWhite(63)) {
white_rochades_small = true;
return true;
}
}
if (isWhiteKing(60) && isEmpty(59) && isEmpty(58) && isEmpty(57) && (t == 58)) {
if ((getType(56) == ROOK) && isWhite(56)) {
white_rochades_big = true;
return true;
}
}
}
if (isBlackKing(o)) { /* Black: Rochade */
if (isBlackKing(4) && isEmpty(5) && isEmpty(6) && (t == 6)) {
if ((getType(7) == ROOK) && isBlack(7)) {
black_rochades_small = true;
return true;
}
}
if (isBlackKing(4) && isEmpty(3) && isEmpty(2) && isEmpty(1) && (t == 2)) {
if ((getType(0) == ROOK) && isBlack(0)) {
black_rochades_big = true;
return true;
}
}
}
}
break;
case PAWN:
if (getColor(o).equals("white")) {
if (steps == 7 && rows == 1 && isEnemy(t, o) && t < o)
return true;
if (steps == 9 && rows == 1 && isEnemy(t, o) && t < o)
return true;
} else {
if (steps == 7 && rows == 1 && isEnemy(t, o) && t > o)
return true;
if (steps == 9 && rows == 1 && isEnemy(t, o) && t > o)
return true;
}
if (steps % 8 == 0) {
if (t > o) {
for (dx = o + 8; dx <= t; dx += 8) {
if (getColor(dx) != null)
return false;
}
} else {
for (dx = o - 8; dx >= t; dx -= 8) {
if (getColor(dx) != null)
return false;
}
}
if (steps == 8 && rows == 1) {
if (getColor(o).equals("white") && t < o)
return true;
if (getColor(o).equals("black") && t > o)
return true;
}
if (steps == 16 && rows == 2 && (o >= 8 && o <= 15)) {
if (getColor(o).equals("white") && t < o)
return true;
if (getColor(o).equals("black") && t > o)
return true;
}
if (steps == 16 && rows == 2 && (o >= 48 && o <= 55)) {
if (getColor(o).equals("white") && t < o)
return true;
if (getColor(o).equals("black") && t > o)
return true;
}
}
break;
}
return false;
}
/**
* This method must be called immediately after isValidMove(t, o)
*/
boolean rochade() {
if (white_rochades_small) {
setPiece(61, getPiece(63));
setPiece(63, new Piece(null, null, EMPTY, 0));
return true;
}
if (white_rochades_big) {
setPiece(59, getPiece(56));
setPiece(56, new Piece(null, null, EMPTY, 0));
return true;
}
if (black_rochades_small) {
setPiece(5, getPiece(7));
setPiece(7, new Piece(null, null, EMPTY, 0));
return true;
}
if (black_rochades_big) {
setPiece(3, getPiece(0));
setPiece(0, new Piece(null, null, EMPTY, 0));
return true;
}
return false;
}
/**
* checks, whether color is in check or not.
*/
public boolean isCheck(String color) {
int i;
int wking;
int bking;
wking = bking = -1;
for (i = 0; i < 64; i++) {
if (isWhiteKing(i)) {
wking = i;
}
if (isBlackKing(i)) {
bking = i;
}
}
// returns 64 false positives
if (wking == -1 || bking == -1)
return true;
if (color.equals("white")) {
for (i = 0; i < 64; i++)
if (validMove(wking, i)) {
return true;
}
return false;
}
if (color.equals("black")) {
for (i = 0; i < 64; i++)
if (validMove(bking, i)) {
return true;
}
return false;
}
return false;
}
/**
* simulates a "valid" move or returns false. all changes are relative to
* pieces and will not be painted. This method sets internal variables for
* the rochade() method, which will be overwritten.
*/
public boolean simulateMove(int t, int o) {
if (!validMove(t, o)) {
return false;
}
push(getPiece(t), t, getPiece(o), o);
if (getType(o) == PAWN) {
if (isBlack(o) && t >= 56)
setPiece(o, new Piece(black_queen));
if (isWhite(o) && t <= 7)
setPiece(o, new Piece(white_queen));
}
setPiece(t, new Piece(getPiece(o)));
setPiece(o, new Piece(null, null, EMPTY, 0));
if (isCheck(getColor(t))) {
/* restore current position */
if (UNDO_DEBUG)
print("UNDO", t, o, 0);
undo();
return false;
}
return true;
}
/**
* performs a "valid" move or returns false. all changes are relative to
* board_pieces and will be painted.
*/
public boolean doMove(int t, int o) {
if (!validMove(t, o)) {
return false;
}
push(getPiece(t), t, getPiece(o), o);
if (getType(o) == PAWN) {
if (isBlack(o) && t >= 56)
setPiece(o, new Piece(black_queen));
if (isWhite(o) && t <= 7)
setPiece(o, new Piece(white_queen));
}
setPiece(t, new Piece(getPiece(o)));
setPiece(o, new Piece(null, null, EMPTY, 0));
if (rochade())
System.out.println("Rochade");
if (isCheck(getColor(t))) {
// restore current positions
if (UNDO_DEBUG)
print("UNDO", t, o, 0);
undo();
return false;
}
board_pieces = getPieces();
repaint();
moveNr = stack.size();
return true;
}
/**
* converts the internal representation into normal chess notation and
* writes it to stdout
*/
public void print(String s, int t, int o, int value) {
int row1, col1, row2, col2;
row1 = o / 8;
col1 = o - (8 * row1);
row2 = t / 8;
col2 = t - (8 * row2);
System.out.printf("%s: %C%d-%c%d = %3d%n", s, ('A') + col1, 8 - row1, ('A') + col2, 8 - row2, value);
}
}