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<?php
// EasyGiant is a PHP framework for creating and managing dynamic content
//
// Copyright (C) 2009 - 2011 Antonio Gallo
// See COPYRIGHT.txt and LICENSE.txt.
//
// This file is part of EasyGiant
//
// EasyGiant 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 3 of the License, or
// (at your option) any later version.
//
// EasyGiant 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 EasyGiant. If not, see <http://www.gnu.org/licenses/>.
if (!defined('EG')) die('Direct access not allowed!');
//class to create a captcha
//you have to call session_start() before to initialize a captcha object
class Image_Gd_Captcha
{
private $params = array(); //parameters of the object
private $string = null; //the text string of the captcha
public function __construct($params = null)
{
$here = realpath('.');
$defaultParams = array(
'boxWidth' => 150,
'boxHeight' => 100,
'charNumber' => 6,
'fontPath' => $here.'/External/Fonts/FreeFont/FreeMono.ttf',
'undulation' => true,
'align' => false,
'charHeight' => 28,
'sessionKey' => 'captchaString',
);
//set the $this->scaffold->params array
if (is_array($params))
{
foreach ($params as $key => $value)
{
$defaultParams[$key] = $value;
}
}
$this->params = $defaultParams;
$this->string = generateString($this->params['charNumber']);
}
public function render()
{
//space among characters
$space = $this->params['boxWidth'] / ($this->params['charNumber']+1);
//create the image box
$img = imagecreatetruecolor($this->params['boxWidth'],$this->params['boxHeight']);
$background = imagecolorallocate($img,255,255,255);
$border = imagecolorallocate($img,0,0,0);
$colors[] = imagecolorallocate($img,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));
$colors[] = imagecolorallocate($img,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));
$colors[] = imagecolorallocate($img,mt_rand(0,125),mt_rand(0,125),mt_rand(0,125));
//create the background
imagefilledrectangle($img,1,1,$this->params['boxWidth']-2,$this->params['boxHeight']-2,$background);
imagerectangle($img,0,0,$this->params['boxWidth']-1,$this->params['boxHeight']-2,$border);
//set the text
for ($i=0; $i< $this->params['charNumber']; $i++)
{
$color = $colors[$i % count($colors)];
$char = substr($this->string,$i,1);
$fontPath = $this->params['fontPath'];
$angle = $this->params['undulation'] === false ? 0 : -20+rand(0,40);
$yposFixed = (int)(($this->params['boxHeight'])/2);
$ypos = $this->params['align'] === true ? $yposFixed : $yposFixed + mt_rand(0,10);
$charHeight = $this->params['charHeight'];
imagettftext($img,$charHeight + rand(0,8),$angle,($i+0.3)*$space,$ypos,$color,$fontPath,$char);
}
$noiseColor = imagecolorallocate($img, mt_rand(125,255), mt_rand(125,255), mt_rand(125,255));
/* generate random dots in background */
for( $i=0; $i<($this->params['boxWidth'] * $this->params['boxHeight'])/7; $i++ ) {
imagefilledellipse($img, mt_rand(0,$this->params['boxWidth']), mt_rand(0,$this->params['boxHeight']), 1, 1, $noiseColor);
}
$_SESSION[$this->params['sessionKey']] = $this->string;
header('Content-Type: image/png');
imagepng($img);
imagedestroy($img);
}
}
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