/**
* $Id: CheckersBoard.java 152 2008-04-27 02:04:31Z mbroeker $
* $URL: http://localhost/svn/eclipse/Schachspiel/trunk/org/homelinux/largo/games/board/checkersboard/CheckersBoard.java $
*/
package org.homelinux.largo.games.board.checkersboard;
import java.awt.Image;
import org.homelinux.largo.games.board.Board;
import org.homelinux.largo.games.board.History;
import org.homelinux.largo.games.board.Piece;
import org.homelinux.largo.utils.ImgComponent;
public class CheckersBoard extends Board {
static final long serialVersionUID = 250408;
static final int PIECE = 1;
static final int QUEEN = 2;
final Piece white_super_sun =
new Piece(new ImgComponent("images/white_super_sun.png").getImage(), "white", QUEEN, 50);
final Piece black_super_sun =
new Piece(new ImgComponent("images/black_super_sun.png").getImage(), "black", QUEEN, 50);
void initBoard () {
for (int i=1;i<8;i+=2)
add (new ImgComponent ("images/black_sun.png").getImage (), i, "black", PIECE);
for (int i=8;i<15;i+=2)
add (new ImgComponent ("images/black_sun.png").getImage (), i, "black", PIECE);
for (int i=17;i<=23;i+=2)
add (new ImgComponent ("images/black_sun.png").getImage (), i, "black", PIECE);
for (int i=40;i<47;i+=2)
add (new ImgComponent ("images/white_sun.png").getImage (), i, "white", PIECE);
for (int i=49;i<=55;i+=2)
add (new ImgComponent ("images/white_sun.png").getImage (), i, "white", PIECE);
for (int i=56;i<63;i+=2)
add (new ImgComponent ("images/white_sun.png").getImage (), i, "white", PIECE);
}
/**
* The init method initializes a complete checkers board with figures and a history.
*/
public void init() {
super.init();
initBoard();
board_pieces = getPieces();
repaint();
}
public CheckersBoard (int w, int h) {
super(w, h);
}
void add (Image img, int i, String c, int t) {
int v = 0;
switch(t) {
case PIECE:
v=10;
}
setPiece(i, new Piece(img, c, t, v));
}
/**
* Checks, wether this move is possible or not.
*/
public boolean validMove (int t, int o) {
int steps;
int rows;
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 PIECE:
if (steps % 7 == 0 ) {
if (steps == 7 && rows == 1 && isEmpty(t)) {
if ( isBlack(o) && (t>o) )
return true;
if ( isWhite(o) && (t<o) )
return true;
}
if (steps == 14 && rows == 2 && isEmpty(t)) {
if ( isBlack(o) && (t>o) && isEnemy(o+7, o) )
return true;
if ( isWhite(o) && (t<o) && isEnemy(o-7, o) )
return true;
}
}
if (steps % 9 == 0 ) {
if (steps == 9 && rows == 1 && isEmpty(t)) {
if ( isBlack(o) && (t>o) )
return true;
if ( isWhite(o) && (t<o) )
return true;
}
if (steps == 18 && rows == 2 && isEmpty(t)) {
if ( isBlack(o) && (t>o) && isEnemy(o+9, o) )
return true;
if ( isWhite(o) && (t<o) && isEnemy(o-9, o) )
return true;
}
}
break;
case QUEEN:
if (steps % 7 == 0 && isEmpty(t) ) {
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 && isEmpty(t) ) {
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;
}
return false;
}
/**
* pop: undo the push operation.
*/
public void undo() {
History h1 = null;
History h2 = null;
int size = stack.size();
int pos;
if ( size < 2 )
return;
h1 = stack.elementAt(size-1);
h2 = stack.elementAt(size-2);
setPiece(h1.pos(), h1.piece());
setPiece(h2.pos(), h2.piece());
if ( getType(h2.pos()) != EMPTY ) {
pos = 2*h2.pos()-h1.pos();
if ( pos >= 0 && pos <64)
setPiece(pos, new Piece(null, null, EMPTY, 0));
}
stack.setSize(size-2);
/* Reset the current player */
setBlacksTurn(h2.turn());
}
/**
* simulates a "valid" move or returns false.
* all changes are relative to pieces and will not be painted.
*/
public boolean simulateMove(int t, int o) {
int rows = Math.abs(t/8 - o/8);
int pos;
if ( !validMove(t, o) ) {
return false;
}
if ( rows == 2 && getType(o) == PIECE) {
pos = (t-o)/2 + o;
push(getPiece(pos), pos, getPiece(o), o);
setPiece(pos, new Piece(null, null, EMPTY, 0));
} else
push(getPiece(t), t, getPiece(o), o);
setPiece(t, new Piece(getPiece(o)));
setPiece(o, new Piece(null, null, EMPTY, 0));
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) {
int steps = Math.abs(t-o);
int rows = Math.abs(t/8-o/8);
int pos;
if ( !validMove(t, o) ) {
return false;
}
if ( rows == 2 && getType(o) == PIECE) {
pos = (t-o)/2 + o;
push(getPiece(pos), pos, getPiece(o), o);
setPiece(pos, new Piece(null, null, EMPTY, 0));
} else if ( rows >= 2 && getType(o) == QUEEN ) {
if (steps % 7 == 0 ) {
if ( t > o )
for ( pos=o+7;pos <= t-7;pos+=7 ) {
if ( isEnemy(pos, o) ) {
push(getPiece(pos), pos, getPiece(o), o);
setPiece(pos, new Piece(null, null, EMPTY, 0));
}
}
else {
for ( pos=o-7;pos >= t+7;pos-=7 ) {
if ( isEnemy(pos, o) ) {
push(getPiece(pos), pos, getPiece(o), o);
setPiece(pos, new Piece(null, null, EMPTY, 0));
}
}
}
}
if (steps % 9 == 0 ) {
if ( t > o )
for ( pos=o+9;pos <= t-9;pos+=9 ) {
if ( isEnemy(pos, o) ) {
push(getPiece(pos), pos, getPiece(o), o);
setPiece(pos, new Piece(null, null, EMPTY, 0));
}
}
else {
for ( pos=o-9;pos >= t+9;pos-=9 ) {
if ( isEnemy(pos, o) ) {
push(getPiece(pos), pos, getPiece(o), o);
setPiece(pos, new Piece(null, null, EMPTY, 0));
}
}
}
}
}
if ( t <= 7 && getType(o) == PIECE)
setPiece(t, new Piece(white_super_sun));
else if (t >=56 && getType(o) == PIECE)
setPiece(t, new Piece(black_super_sun));
else
setPiece(t, new Piece(getPiece(o)));
setPiece(o, new Piece(null, null, EMPTY, 0));
board_pieces = getPieces();
repaint();
moveNr = stack.size();
return true;
}
}