chessdiagram.php

<?php

require('chessset.php');

$whites = $_GET['w'];
$blacks = $_GET['b'];

$board = array();

parsePieces($whites, 'w', $board);
parsePieces($blacks, 'b', $board);

$set = new ChessSet();

header("Content-type: image/png");
header('Content-Disposition: attachment; filename="chess-diagra-matic.png"');

imagepng(placePieces($board, $set));

function parsePieces($pieces, $color, &$board)
{
    foreach (explode(",", $pieces) as $piece)
    {
        $piece = trim ($piece);
        
        if (strlen($piece) == 2)
        {
            $piece = 'P' . $piece;
        }
        
        if (strlen($piece) != 3)
            continue;
        
        $code = strtoupper(substr($piece, 0, 1));
        $col  = strtolower(substr($piece, 1, 1));
        $row  = intval(substr($piece, 2, 1));
        
        $board[$row][$col] = $color . $code;
    }
}

function placePieces($board, $set)
{
    $cols = array ('a', 'b', 'c', 'd', 'e', 'f', 'g', 'h');
    $rows = array (8, 7, 6, 5, 4, 3, 2, 1);
    
    $boardImg = $set->getBoard();
    $size = $set->getSquareSize();
    
    $background = 'w';
    
    $offy = $set->getMarginTop();
    
    foreach ($rows as $row)
    {
        $offx = $set->getMarginLeft();
        
        foreach ($cols as $col)
        {
            if (isset($board[$row][$col]))
            {
                $color = substr($board[$row][$col], 0, 1);
                $code  = substr($board[$row][$col], 1, 1);
                
                if ($set->isTransparent())
                {
                    $pieceImg = $set->getPiece($code, $color, $background);
                    
                    $pieceImgTrueColor = imagecreatetruecolor($size, $size);
                    
                    imagecopy(
                        $pieceImgTrueColor,
                        $pieceImg,
                        0,
                        0,
                        0,
                        0,
                        $size,
                        $size);
                    
                    imagecolortransparent($pieceImgTrueColor, imagecolorat($pieceImgTrueColor, 0, 0));
                    
                    imagecopymerge(
                        $boardImg,
                        $pieceImgTrueColor,
                        $offx,
                        $offy,
                        0,
                        0,
                        $size,
                        $size,
                        100);
                }
                else
                    imagecopy(
                        $boardImg,
                        $set->getPiece($code, $color, $background),
                        $offx,
                        $offy,
                        0,
                        0,
                        $size,
                        $size);
            }
            
            $background = $background == 'w' ? 'b' : 'w';
            
            $offx += $size;
        }
            
        $background = $background == 'w' ? 'b' : 'w';
        
        $offy += $size;
    }
    
    return $boardImg;
}

?>