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<!DOCTYPE html>
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<html>
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<head>
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<title>Chess</title>
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<meta charset="UTF-8"/>
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</head>
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<body>
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<?php

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function is_black($c) {

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	return ($c==='B'||$c==='Black');

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}

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function is_white($c) {

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	return ($c==='W'||$c==='White');

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}

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abstract class Piece {

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	public $x;

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	public $y;

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	public $color;

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	public $parent;

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	public function __construct(&$parent=NULL) {

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		$this->parent=$parent;

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	}

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	public function can_move($diff_x, $diff_y) { return false; }

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	public function can_eat($diff_x, $diff_y) { return $this->can_move($diff_x, $diff_y); }

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}

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class Pawn extends Piece {

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	public function can_move($diff_x, $diff_y) {

29-
		/*if(is_black($c)) {

29+
		if($this->y===6) return ($diff_y<=-1 && $diff_y>=-2);

30-
			if($y===1) return ($diff_y>=1 && $diff_y<=2);

30+
		else return ($diff_y==-1);

31-
			else return ($diff_y==1);

31+
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	public function can_eat($diff_x, $diff_y) {

33-
		elseif(is_white($c)) {//*/

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		return (abs($diff_x)==1 && $diff_y==-1);

34-
			if($this->y===6) return ($diff_y<=-1 && $diff_y>=-2);

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35-
			else return ($diff_y==-1);

35+
36-
		/*}

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		return false;//*/

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}

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class Rook extends Piece {

40-
		/*if(is_black($c)) {

40+
41-
			return (abs($diff_x)==1 && $diff_y==1);

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			( ($diff_x==0 && abs($diff_y)>0) || ($diff_y==0 && abs($diff_x)>0) ) &&

43-
		elseif(is_white($c)) {//*/

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			return (abs($diff_x)==1 && $diff_y==-1);

44+
45-
		/*}

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		return false;//*/

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	public function __toString() {

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		return 'Rook';

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	}

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}

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class Knight extends Piece {

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	public function can_move($diff_x, $diff_y) {

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		return ( ( abs($diff_x)>=1 && abs($diff_x)<=2 ) && ( abs($diff_y)>=1 && abs($diff_y)<=2) && ( abs($diff_x)+abs($diff_y)==3 ) );

54-
		return ( ($diff_x==0 && abs($diff_y)>0) || ($diff_y==0 && abs($diff_x)>0) );

54+
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	public function __toString() {

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		return 'Knight';

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	}

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}

59-
			$this->can_move($diff_x, $diff_y) &&

59+
class Bishop extends Piece {

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	public function can_move($diff_x, $diff_y) {

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		return (

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			( abs($diff_x)==abs($diff_y) ) && abs($diff_x)>0 &&

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			$this->parent->is_free($this->x, $this->y, $this->x+$diff_x, $this->y+$diff_y)

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		);

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	}

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	public function __toString() {

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		return 'Bishop';

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	}

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}

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class King extends Piece {

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	public function can_move($diff_x, $diff_y) {

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		return ( abs($diff_x)<=1 && abs($diff_y)<=1 && (abs($diff_x)+abs($diff_y)>=1) );

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	}

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	public function __toString() {

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		return 'King';

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	}

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}

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class Queen extends Piece {

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	public function can_move($diff_x, $diff_y) {

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		return (

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			(abs($diff_x)==abs(diff_y)) || ($diff_x==0 && abs($diff_y)>0) || ($diff_y==0 && abs($diff_x)>0) &&

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			$this->parent->is_free($this->x, $this->y, $this->x+$diff_x, $this->y+$diff_y)

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		);

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	}

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	public function __toString() {

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		return 'Queen';

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	}

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}

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//black up (y=0), white down (y=7)

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class board {

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	public $grid;

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	public $width;

93-
			if($this->get_piece($src_x+$px*$i, $src_y+$py*$i) instanceof Piece) return false;

93+
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	public $cur_color;

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	public function __construct() {

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		$this->grid=array();

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		$this->width=8;

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		$this->height=8;

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		for($i=0;$i<$this->height;++$i) {

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			$this->grid[$i]=array();

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			for($j=0;$j<$this->width;++$j) {

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				$this->grid[$i][$j]='&nbsp;';

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			}

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		}

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	}

106-
$board->grid[7][0]='Rook';

106+
107-
$board->grid[7][1]='Knight';

107+
108-
$board->grid[7][2]='Bishop';

108+
109-
$board->grid[7][3]='Queen';

109+
110-
$board->grid[7][4]='King';

110+
111-
$board->grid[7][5]='Bishop';

111+
112-
$board->grid[7][6]='Knight';

112+
113-
for($i=0;$i<8;++$i) {

113+
114-
	$board->grid[6][$i]=new Pawn($board);

114+
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		for($i=1; $i<max(abs($diff_x),abs($diff_y)); ++$i) {

116-
$board->grid[7][7]='Rook';

116+
			if($this->is_empty($src_x+$px*$i, $src_y+$py*$i)) return false;

117
		}

118-
var_dump($board->grid[6][0]->parent->grid[7][7]);

118+
119-
$test=new Rook($board);

119+
120-
$test->x=0;

120+
121-
$test->y=7;

121+
122-
$board->grid[7][0]=clone $test;

122+
123-
$test->x=7;

123+
124-
$board->grid[7][7]=clone $test;

124+
125-
var_dump($board->grid[7][0]->x);

125+
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	public function add_piece($x, $y, $piece) {

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		$p=new $piece($this);

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		$p->x=$x;

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		$p->y=$y;

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		$p->color=$this->cur_color;

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		$this->grid[$y][$x]=$p;

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	}

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};

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$board=new board();

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//var_dump($board->grid);

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$board->cur_color='W';

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$h=7;

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	$board->add_piece(0, $h, 'Rook');

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	$board->add_piece(1, $h, 'Knight');

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	$board->add_piece(2, $h, 'Bishop');

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	$board->add_piece(3, $h, 'Queen');

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	$board->add_piece(4, $h, 'King');

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	$board->add_piece(5, $h, 'Bishop');

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	$board->add_piece(6, $h, 'Knight');

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	$board->add_piece(7, $h, 'Rook');

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--$h;

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	for($i=0;$i<8;++$i) {

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		$board->add_piece($i, $h, 'Pawn');

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	}

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$board->cur_color='B';

151
$h=0;

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	$board->add_piece(0, $h, 'Rook');

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	$board->add_piece(1, $h, 'Knight');

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	$board->add_piece(2, $h, 'Bishop');

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	$board->add_piece(3, $h, 'Queen');

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	$board->add_piece(4, $h, 'King');

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	$board->add_piece(5, $h, 'Bishop');

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	$board->add_piece(6, $h, 'Knight');

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	$board->add_piece(7, $h, 'Rook');

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++$h;

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	for($i=0;$i<8;++$i) {

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		$board->add_piece($i, $h, 'Pawn');

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	}

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?><table border="1"><?php

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for($y=0;$y<8;++$y) {

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?>

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	<tr>

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<?php

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	for($x=0;$x<8;++$x) {

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?>		<td><?php echo $board->get_piece($x, $y); ?></td>

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<?php

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	}

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?>	</tr><?php

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}

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?>

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</table>

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</body>

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</html>
        

    


            


                                


        

            



                
    

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