<?

/***************************************************************************\
|                                                                           |
|  Copyright 2007 Image Validator                                           |
|  Pavel Tzonkov <pavelc@users.sourceforge.net>                             |
|                                                                           |
|  Image Validator is free software; you can redistribute it and/or modify  |
|  it under the terms of the GNU General Public License as published by     |
|  the Free Software Foundation; either version 2 of the License, or (at    |
|  your option) any later version.                                          |
|                                                                           |
|  Image Validator is distributed in the hope that it will be useful, but   |
|  WITHOUT ANY WARRANTY; without even the implied warranty of               |
|  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU         |
|  General Public License for more details.                                 |
|                                                                           |
|  You should have received a copy of the GNU General Public License along  |
|  with Image Validator; if not, write to the Free Software Foundation,     |
|  Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA              |
|                                                                           |
\***************************************************************************/


session_start();

require "_config.php";

$line_colors = preg_split("/,\s*?/", CODE_LINE_COLORS);
$char_colors = preg_split("/,\s*?/", CODE_CHAR_COLORS);
$fonts = collect_files(PATH_TTF, "ttf");

$img = imagecreatetruecolor(CODE_WIDTH, CODE_HEIGHT);
imagefilledrectangle($img, 0, 0, CODE_WIDTH - 1, CODE_HEIGHT - 1, gd_color(CODE_BG_COLOR));


// Draw lines

for ($i = 0; $i < CODE_LINES_COUNT; $i++)
    imageline($img,
        rand(0, CODE_WIDTH - 1),
        rand(0, CODE_HEIGHT - 1),
        rand(0, CODE_WIDTH - 1),
        rand(0, CODE_HEIGHT - 1),
        gd_color($line_colors[rand(0, count($line_colors) - 1)])
    );


// Draw code

$code = "";
$y = (CODE_HEIGHT / 2) + (CODE_FONT_SIZE / 2);
for ($i = 0; $i < CODE_CHARS_COUNT; $i++) {
    $color = gd_color($char_colors[rand(0, count($char_colors) - 1)]);
    $angle = rand(-30, 30);
    $char = substr(CODE_ALLOWED_CHARS, rand(0, strlen(CODE_ALLOWED_CHARS) - 1), 1);
    $font = PATH_TTF . "/" . $fonts[rand(0, count($fonts) - 1)];
    $x = (intval((CODE_WIDTH / CODE_CHARS_COUNT) * $i) + (CODE_FONT_SIZE / 2));
    $code .= $char;
    imagettftext($img, CODE_FONT_SIZE, $angle, $x, $y, $color, $font, $char);
}

$_SESSION['__img_code__'] = md5($code);

header("Content-Type: image/png");
imagepng($img);
imagedestroy($img);


function gd_color($html_color) {
    return preg_match('/^#?([\dA-F]{6})$/i', $html_color, $rgb)
        ? hexdec($rgb[1]) : false;
}


function collect_files($dir, $ext) {
    if (false !== ($dir = opendir($dir))) {
        $files = array();

        while (false !== ($file = readdir($dir)))
            if (preg_match("/\\.$ext\$/i", $file))
                $files[] = $file;

        return $files;

    } else
        return false;
}

?>