org/homelinux/largo/games/board/checkersboard/CheckersBoard.java
author Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 *   $Id: CheckersBoard.java 152 2008-04-27 02:04:31Z mbroeker $
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 *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java $
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 */
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package org.homelinux.largo.games.board.checkersboard;
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import java.awt.Image;
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import org.homelinux.largo.games.board.Board;
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import org.homelinux.largo.games.board.History;
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import org.homelinux.largo.games.board.Piece;
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import org.homelinux.largo.utils.ImgComponent;
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public class CheckersBoard extends Board {
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    static final long serialVersionUID = 1L;
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    static final int PIECE = 1;
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    static final int QUEEN = 2;
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    final Piece white_super_sun = new Piece(new ImgComponent("images/white_super_sun.png").getImage(), "white", QUEEN,
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            50);
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    final Piece black_super_sun = new Piece(new ImgComponent("images/black_super_sun.png").getImage(), "black", QUEEN,
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            50);
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    void initBoard() {
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        for (int i = 1; i < 8; i += 2)
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            add(new ImgComponent("images/black_sun.png").getImage(), i, "black", PIECE);
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        for (int i = 8; i < 15; i += 2)
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            add(new ImgComponent("images/black_sun.png").getImage(), i, "black", PIECE);
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        for (int i = 17; i <= 23; i += 2)
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            add(new ImgComponent("images/black_sun.png").getImage(), i, "black", PIECE);
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        for (int i = 40; i < 47; i += 2)
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            add(new ImgComponent("images/white_sun.png").getImage(), i, "white", PIECE);
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        for (int i = 49; i <= 55; i += 2)
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            add(new ImgComponent("images/white_sun.png").getImage(), i, "white", PIECE);
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        for (int i = 56; i < 63; i += 2)
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            add(new ImgComponent("images/white_sun.png").getImage(), i, "white", PIECE);
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    }
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    /**
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     * The init method initializes a complete checkers board with figures and a
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     * history.
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     */
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    public void init() {
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        super.init();
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        initBoard();
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        board_pieces = getPieces();
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        repaint();
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    }
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    public CheckersBoard(int w, int h) {
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        super(w, h);
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    }
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    void add(Image img, int i, String c, int t) {
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        int v = 0;
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        switch (t) {
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        case PIECE:
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            v = 10;
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        }
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        setPiece(i, new Piece(img, c, t, v));
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    }
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    /**
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     * Checks, wether this move is possible or not.
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     */
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    public boolean validMove(int t, int o) {
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        int steps;
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        int rows;
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        if (t == o)
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            return false;
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        if (isSamePiece(t, o))
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            return false;
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        if (getType(o) == EMPTY)
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            return false;
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        /*
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         * 00 01 02 03 04 05 06 07
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         * 08 09 10 11 12 13 14 15
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         * 16 17 18 19 20 21 22 23
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         * 24 25 26 27 28 29 30 31
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         * 32 33 34 35 36 37 38 39
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         * 40 41 42 43 44 45 46 47
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         * 48 49 50 51 52 53 54 55
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         * 56 57 58 59 60 61 62 63
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         */
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        steps = Math.abs(t - o);
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        rows = Math.abs(t / 8 - o / 8);
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        switch (getType(o)) {
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        case PIECE:
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            if (steps % 7 == 0) {
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                if (steps == 7 && rows == 1 && isEmpty(t)) {
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                    if (isBlack(o) && (t > o))
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                        return true;
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                    if (isWhite(o) && (t < o))
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                        return true;
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                }
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                if (steps == 14 && rows == 2 && isEmpty(t)) {
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                    if (isBlack(o) && (t > o) && isEnemy(o + 7, o))
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                        return true;
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                    if (isWhite(o) && (t < o) && isEnemy(o - 7, o))
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                        return true;
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                }
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            }
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            if (steps % 9 == 0) {
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                if (steps == 9 && rows == 1 && isEmpty(t)) {
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                    if (isBlack(o) && (t > o))
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                        return true;
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                    if (isWhite(o) && (t < o))
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                        return true;
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                }
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                if (steps == 18 && rows == 2 && isEmpty(t)) {
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                    if (isBlack(o) && (t > o) && isEnemy(o + 9, o))
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                        return true;
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                    if (isWhite(o) && (t < o) && isEnemy(o - 9, o))
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                        return true;
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                }
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            }
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            break;
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        case QUEEN:
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            if (steps % 7 == 0 && isEmpty(t)) {
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                if (steps == 7 && rows == 1)
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                    return true;
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                if (steps == 14 && rows == 2)
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                    return true;
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                if (steps == 21 && rows == 3)
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                    return true;
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                if (steps == 28 && rows == 4)
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                    return true;
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                if (steps == 35 && rows == 5)
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                    return true;
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                if (steps == 42 && rows == 6)
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                    return true;
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                if (steps == 49 && rows == 7)
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                    return true;
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            }
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            if (steps % 9 == 0 && isEmpty(t)) {
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                if (steps == 9 && rows == 1)
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                    return true;
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                if (steps == 18 && rows == 2)
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                    return true;
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                if (steps == 27 && rows == 3)
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                    return true;
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                if (steps == 36 && rows == 4)
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                    return true;
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                if (steps == 45 && rows == 5)
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                    return true;
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                if (steps == 54 && rows == 6)
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                    return true;
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                if (steps == 63 && rows == 7)
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                    return true;
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            }
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            break;
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        }
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        return false;
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    }
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13
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    /**
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     * pop: undo the push operation.
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     */
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    public void undo() {
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        History h1 = null;
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        History h2 = null;
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        int size = stack.size();
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        int pos;
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        if (size < 2)
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            return;
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        h1 = stack.elementAt(size - 1);
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        h2 = stack.elementAt(size - 2);
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        setPiece(h1.pos(), h1.piece());
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        setPiece(h2.pos(), h2.piece());
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        if (getType(h2.pos()) != EMPTY) {
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            pos = 2 * h2.pos() - h1.pos();
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            if (pos >= 0 && pos < 64)
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                setPiece(pos, new Piece(null, null, EMPTY, 0));
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        }
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        stack.setSize(size - 2);
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        /* Reset the current player */
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        setBlacksTurn(h2.turn());
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    }
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    /**
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     * simulates a "valid" move or returns false. all changes are relative to
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     * pieces and will not be painted.
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     */
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    public boolean simulateMove(int t, int o) {
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        int rows = Math.abs(t / 8 - o / 8);
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        int pos;
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        if (!validMove(t, o)) {
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            return false;
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        }
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        if (rows == 2 && getType(o) == PIECE) {
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            pos = (t - o) / 2 + o;
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            push(getPiece(pos), pos, getPiece(o), o);
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            setPiece(pos, new Piece(null, null, EMPTY, 0));
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        } else
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            push(getPiece(t), t, getPiece(o), o);
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        setPiece(t, new Piece(getPiece(o)));
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        setPiece(o, new Piece(null, null, EMPTY, 0));
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        return true;
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    }
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    /**
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     * performs a "valid" move or returns false. all changes are relative to
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     * board_pieces and will be painted.
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     */
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    public boolean doMove(int t, int o) {
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        int steps = Math.abs(t - o);
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        int rows = Math.abs(t / 8 - o / 8);
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        int pos;
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        if (!validMove(t, o)) {
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            return false;
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        }
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        if (rows == 2 && getType(o) == PIECE) {
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            pos = (t - o) / 2 + o;
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            push(getPiece(pos), pos, getPiece(o), o);
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            setPiece(pos, new Piece(null, null, EMPTY, 0));
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        } else if (rows >= 2 && getType(o) == QUEEN) {
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            if (steps % 7 == 0) {
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                if (t > o)
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                    for (pos = o + 7; pos <= t - 7; pos += 7) {
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                        if (isEnemy(pos, o)) {
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                            push(getPiece(pos), pos, getPiece(o), o);
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                            setPiece(pos, new Piece(null, null, EMPTY, 0));
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                        }
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                    }
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                else {
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                    for (pos = o - 7; pos >= t + 7; pos -= 7) {
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                        if (isEnemy(pos, o)) {
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                            push(getPiece(pos), pos, getPiece(o), o);
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                            setPiece(pos, new Piece(null, null, EMPTY, 0));
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                        }
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                    }
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                }
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            }
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13
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            if (steps % 9 == 0) {
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                if (t > o)
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                    for (pos = o + 9; pos <= t - 9; pos += 9) {
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                        if (isEnemy(pos, o)) {
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                            push(getPiece(pos), pos, getPiece(o), o);
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                            setPiece(pos, new Piece(null, null, EMPTY, 0));
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                        }
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                    }
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                else {
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                    for (pos = o - 9; pos >= t + 9; pos -= 9) {
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                        if (isEnemy(pos, o)) {
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                            push(getPiece(pos), pos, getPiece(o), o);
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                            setPiece(pos, new Piece(null, null, EMPTY, 0));
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                        }
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                    }
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                }
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            }
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        }
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        if (t <= 7 && getType(o) == PIECE)
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            setPiece(t, new Piece(white_super_sun));
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        else if (t >= 56 && getType(o) == PIECE)
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            setPiece(t, new Piece(black_super_sun));
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        else
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            setPiece(t, new Piece(getPiece(o)));
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        setPiece(o, new Piece(null, null, EMPTY, 0));
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        board_pieces = getPieces();
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        repaint();
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        moveNr = stack.size();
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        return true;
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    }
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}