<?php 

/***************************************************************************
 * Product Name			: AJ Classifides
 * Version 			: V 3.0
 * Release Date			: Friday, March 13, 2009
 * Copyright			: (C) 2009 AJ Square Inc
 * Email			: info@ajsquare.com
 * Company URL			: www.ajsquare.com
 

 ***************************************************************************/
 

/****************************************************************************
 
*      Licence Agreement: 
 
*     This program is a Commercial licensed software. You are not authorized to redistribute it and/or modify/and or sell it under any publication either user and enterprise versions of the License (or) any later version is applicable for the same. If you have received this software without a license, you must not use it, and you must destroy your copy of it immediately. If anybody illegally uses this software, please contact info@ajsquare.com.
 
*****************************************************************************/

 ?>
<?php
session_start();

/*
* File: CaptchaSecurityImages.php
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 03/08/06
* Updated: 07/02/07
* Requirements: PHP 4/5 with GD and FreeType libraries
* Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php
* 
* This program 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.
* 
* This program 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: 
* http://www.gnu.org/licenses/gpl.html
*
*/

class Lib_Captcha {

	var $font = 'includes/Alan Den.ttf';

	function generateCode($characters) {
		/* list all possible characters, similar looking characters and vowels have been removed */
		$possible = '1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ';
		$code = '';
		$i = 0;
		while ($i < $characters) { 
			$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
			$i++;
		}
		return $code;
	}

	function Lib_Captcha($width='200',$height='40',$characters='6') {
		$code = $this->generateCode($characters);
		/* font size will be 75% of the image height */
		$font_size = 60;//$height * 0.45; //10;//
		$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
		/* set the colours */
		$background_color = imagecolorallocate($image, 255, 255, 255);
		$text_color = imagecolorallocate($image, 0, 0, 0);
		$noise_color = imagecolorallocate($image, 255,255,255);
		/* generate random dots in background */
		for( $i=0; $i<($width*$height)/5; $i++ ) {
			imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
		}
		/* generate random lines in background */
		for( $i=0; $i<($width*$height)/300; $i++ ) {
			//imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
		}
		/* create textbox and add text */
		$textbox = imagettfbbox($font_size, 0, $this->font, $code) or die('Error in imagettfbbox function');
		$x = ($width - $textbox[4])/2;
		$y = ($height - $textbox[5])/2;
		imagettftext($image, $font_size, 0, $x, $y, $text_color, $this->font , $code) or die('Error in imagettftext function');
		/* output captcha image to browser */
		header('Content-Type: image/jpeg');
		header('Cache-Control: no-cache, must-revalidate');
		imagejpeg($image);
		imagedestroy($image);
		$_SESSION['security_code'] = $code;		
	}

}

$width =  '320';
$height = '90';
$characters = '4';
$captcha = new Lib_Captcha($width,$height,$characters);

?>