org/homelinux/largo/games/board/Board.java
author Markus Bröker <mbroeker@largo.homelinux.org>
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/**
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 *   $Id: Board.java 148 2008-04-25 22:05:48Z mbroeker $
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 *  $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/Board.java $
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 */
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package org.homelinux.largo.games.board;
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import java.awt.Canvas;
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import java.awt.Color;
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import java.awt.Dimension;
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import java.awt.Graphics;
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import java.awt.Image;
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import java.util.Vector;
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public class Board extends Canvas {
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	static final long serialVersionUID = 140208;
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	protected boolean UNDO_DEBUG  = false;
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	protected Piece board_pieces[];
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	private Piece pieces[];
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	protected Vector<History> stack;
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	protected int moveNr;
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	protected static final int EMPTY = 0;
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	Color color_black;
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	Color color_white;
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	int iHeight;
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	int iWidth;
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	int xPos;
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	int yPos;
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	boolean black;
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	boolean blacksTurn;
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	MouseListener listener = null;
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	/**
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	 * The init method initializes an empty board with a history.
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	 */
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	public void init() {
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		int i;
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		pieces = new Piece[64];
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		for (i = 0; i < 64; i++) {
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			pieces[i] = new Piece(null, null, EMPTY, 0);
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		}
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		xPos = 0;
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		yPos = 0;
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		black = false;
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		blacksTurn = false;
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		board_pieces = getPieces(pieces);
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		stack = new Vector<History>();
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		moveNr = 0;
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	}
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	public Board (int w, int h) {
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		iWidth = w;
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		iHeight = h;
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		color_white = new Color (255, 255, 255);
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		color_black = new Color (50, 100, 200);
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		setPreferredSize (new Dimension(8 * iWidth, 8 * iHeight));
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		init();
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		listener = new MouseListener(iWidth, iHeight);
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		addMouseListener(listener);
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	}
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	/**
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	 * getPiece returns a Piece-Object from the Board Cache. It might not be visible on the current board.
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	 */
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	public Piece getPiece(int t) {
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		return pieces[t];
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	}
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	/**
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	 * setPiece sets a Piece-Object into the Board Cache and will not be visible.
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	 */
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	protected void setPiece(int t, Piece p) {
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		pieces[t] = p;
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	}
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	protected Piece[] getPieces() {
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		return getPieces(pieces);
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	}
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	private Piece[] getPieces(Piece[] which_pieces) {
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		Piece[] p = new Piece[64];
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		int i;
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		for ( i=0;i<64;i++)
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			p[i] = new Piece(which_pieces[i]);
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		return p;
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	}
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	protected void setPieces(Piece[] p) {
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		pieces = p;
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	}
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	/**
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	 * needed in paint(Graphics g)
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	 */
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	private Image getBoardImage (int i) {
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		return board_pieces[i].image;
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	}
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	/**
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	 * getMouseListener returns a valid MouseListener for this Board.
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	 */
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	public MouseListener getMouseListener() {
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		return listener;
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	}
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	/**
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	 * currentMove returns the current stack.size().
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	 */
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	public int currentMove() {
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		return stack.size();
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	}
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	/**
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	 * returns the color of piece[i].
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	 */
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	public String getColor(int i) {
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		return pieces[i].color;
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	}
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	/**
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	 * returns the current Value of a particular piece.
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	 */
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	public int getValue(int i) {
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		return pieces[i].value;
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	}
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	/**
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	 * Defined Integer Constants: EMTPY = 0
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	 */
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	public int getType(int i) {
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		return pieces[i].type;
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	}
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	public boolean isEmpty (int i) {
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		if (pieces[i].type == EMPTY)
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			return true;
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		return false;
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	}
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	boolean BoardisEmpty (int i) {
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		if (board_pieces[i].type == EMPTY)
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			return true;
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		return false;
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	}
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	/**
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	 * blacksTurn = true  -> Black moves
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	 * blacksTurn = false -> White moves
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	 */
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	public boolean isBlacksTurn() {
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		return blacksTurn;
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	}
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	public void setBlacksTurn(boolean b) {
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		blacksTurn = b;
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	}
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	/**
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	 * returns true, when piece[i] is white
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	 */
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	public boolean isWhite(int i) {
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		if ( isEmpty(i) )
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			return false;
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		if ( pieces[i].color.equals ("white") )
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			return true;
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		return false;
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	}
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	/**
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	 * returns true, when piece[i] is black
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	 */
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	public boolean isBlack(int i) {
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		if ( isEmpty(i) )
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			return false;
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		if ( pieces[i].color.equals ("black") )
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			return true;
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		return false;
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	}
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	/**
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	 * returns true, when both pieces have opposite colors
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	 */
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	public boolean isEnemy(int t, int o) {
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		if ( isEmpty(t) )
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			return false;
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		if (!pieces[t].color.equals (pieces[o].color) )
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			return true;
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		return false;
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	}
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	/**
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	 * returns true, when both pieces have the same color
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	 */
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	public boolean isSamePiece(int t, int o) {
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		if ( isEmpty(t) )
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			return false;
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		if (pieces[t].color.equals (pieces[o].color) )
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			return true;
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		return false;
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	}
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	/**
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	 * This function checks for the color of the piece at piece[i] and returns true,
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	 * if the color matches the current Turn.
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	 */
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	public boolean validTurn(int i) {
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		if ( isEmpty(i) )
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			return false;
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		if ( getColor(i).equals("white") && isBlacksTurn() )
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			return false;
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		if ( getColor(i).equals("black") && !isBlacksTurn() )
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			return false;
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		return true;
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	}
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	/**
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	 * simulates a "valid" move or returns false.
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	 * all changes are relative to pieces and will not be painted.
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	 * This method sets internal variables for the rochade() method, which will be overidden.
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	 */
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	public boolean simulateMove(int t, int o) {
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		if ( !validMove(t, o) ) {
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			return false;
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		}
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		push(pieces[t], t, pieces[o], o);
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		pieces[t] = new Piece(pieces[o]);
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		pieces[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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	 * Moves a Piece on the Board at Point p
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	 */
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	public boolean move (Point p) {
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		int t;
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		int o;
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		t = (p.endy * 8) + p.endx;
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		o = (p.starty * 8) + p.startx;
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		if ( t < 0 || t > 63 )
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			return false;
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		if ( o < 0 || o > 63 )
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			return false;
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		if (validTurn(o))
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			return doMove (t, o);
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		System.out.println("It's not your turn!");
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		return false;
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	}
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	/**
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	 * Moves one half-move backward.
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	 */
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	public void backwards() {
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		History h1 = null;
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		History h2 = null;
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		if ( moveNr < 2)
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			return;
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		moveNr -= 2;
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		h1 = stack.elementAt(moveNr);
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		h2 = stack.elementAt(moveNr+1);
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		board_pieces[h1.pos] = h1.piece;
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		board_pieces[h2.pos] = h2.piece;
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		repaint();
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	}
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	/**
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	 * Moves one half-move forward.
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	 */
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	public void forward() {
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		History h1 = null;
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		History h2 = null;
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		if ( moveNr > stack.size()-2 )
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			return;
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		h1 = stack.elementAt(moveNr);
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		h2 = stack.elementAt(moveNr+1);
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		board_pieces[h1.pos] = h2.piece;
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		board_pieces[h2.pos] = new Piece(null, null, EMPTY, 0);
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		moveNr += 2;
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		repaint();
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	}
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	/**
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	 * pushes 2 pieces onto the stack.
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	 */
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	public void push(Piece p1, int t, Piece p2, int o) {
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		stack.add(new History(p1, t, isBlacksTurn()));
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		stack.add(new History(p2, o, isBlacksTurn()));
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	}
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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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		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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		pieces[h1.pos] = h1.piece;
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		pieces[h2.pos] = h2.piece;
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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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	 * This method must be implemented in your "GameBoard"
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	 * Return value:  TRUE: the move IS possible
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	 * Return value: FALSE: the move IS NOT possible
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	 */
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	public boolean validMove(int t, int o) {
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		System.out.println("public boolean validMove(int t, int o): Implement me");
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		return false;
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	}
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	/**
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	 * This method must be implemented in your "GameBoard"
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	 * Return value:  TRUE: the move was performed
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	 * Return value: FALSE: the move was not performed
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	 */
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	public boolean doMove(int t, int o) {
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		System.out.println("public boolean doMove(int t, int o): Implement me");
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		return false;
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	}
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	public void update(Graphics g){
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		paint(g);
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	}
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	public void paint (Graphics g) {
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		for (int i = 0; i < 8; i++) {
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			for (int j = 0; j < 8; j++) {
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				if (black == true) {
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					g.setColor (color_black);
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					g.fillRect (xPos, yPos, iWidth, iHeight);
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					black = false;
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				} else {
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					g.setColor (color_white);
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					g.fillRect (xPos, yPos, iWidth, iHeight);
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					black = true;
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				}
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				if ( !BoardisEmpty ((i * 8) + j) )
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					g.drawImage (getBoardImage ((i * 8) + j), xPos + 5, yPos, this);
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				xPos += iWidth;
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			}
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			xPos = 0;
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			yPos += iHeight;
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			black = !black;
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		}
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		xPos = 0;
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		yPos = 0;
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	}
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}