/trunk/library/Dnez/Captcha/Image/Transparent.php
PHP | 186 lines | 111 code | 24 blank | 51 comment | 34 complexity | c8e9a7d767b784d2f3f0f1803b98424e MD5 | raw file
Possible License(s): AGPL-1.0, LGPL-2.1
- <?php
- /**
- * Zend Framework
- *
- * LICENSE
- *
- * This source file is subject to the new BSD license that is bundled
- * with this package in the file LICENSE.txt.
- * It is also available through the world-wide-web at this URL:
- * http://framework.zend.com/license/new-bsd
- * If you did not receive a copy of the license and are unable to
- * obtain it through the world-wide-web, please send an email
- * to license@zend.com so we can send you a copy immediately.
- *
- * @category Zend
- * @package Zend_Captcha
- * @subpackage Adapter
- * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- * @version $Id: Image.php 16971 2009-07-22 18:05:45Z mikaelkael $
- */
-
- /** Zend_Captcha_Word */
- require_once 'Zend/Captcha/Word.php';
-
- /**
- * Image-based captcha element
- *
- * Generates image displaying random word
- *
- * @category Zend
- * @package Zend_Captcha
- * @subpackage Adapter
- * @copyright Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
- * @license http://framework.zend.com/license/new-bsd New BSD License
- */
- class Dnez_Captcha_Image_Transparent extends Zend_Captcha_Image
- {
- private $transparent = false;
-
- /**
- * Generate image captcha
- *
- * Override this function if you want different image generator
- * Wave transform from http://www.captcha.ru/captchas/multiwave/
- *
- * @param string $id Captcha ID
- * @param string $word Captcha word
- */
- protected function _generateImage($id, $word)
- {
- if (!extension_loaded("gd")) {
- require_once 'Zend/Captcha/Exception.php';
- throw new Zend_Captcha_Exception("Image CAPTCHA requires GD extension");
- }
-
- if (!function_exists("imagepng")) {
- require_once 'Zend/Captcha/Exception.php';
- throw new Zend_Captcha_Exception("Image CAPTCHA requires PNG support");
- }
-
- if (!function_exists("imageftbbox")) {
- require_once 'Zend/Captcha/Exception.php';
- throw new Zend_Captcha_Exception("Image CAPTCHA requires FT fonts support");
- }
-
- $font = $this->getFont();
-
- if (empty($font)) {
- require_once 'Zend/Captcha/Exception.php';
- throw new Zend_Captcha_Exception("Image CAPTCHA requires font");
- }
-
- $w = $this->getWidth();
- $h = $this->getHeight();
- $fsize = $this->getFontSize();
-
- $img_file = $this->getImgDir() . $id . $this->getSuffix();
- if(empty($this->_startImage)) {
- $img = imagecreatetruecolor($w, $h);
- } else {
- $img = imagecreatefrompng($this->_startImage);
- if(!$img) {
- require_once 'Zend/Captcha/Exception.php';
- throw new Zend_Captcha_Exception("Can not load start image");
- }
- $w = imagesx($img);
- $h = imagesy($img);
- }
- $text_color = imagecolorallocate($img, 0, 0, 0);
- imagealphablending($img, false);
- $bg_color = imagecolorallocatealpha($img,255,255,255,127);
- imagefilledrectangle($img, 0, 0, $w-1, $h-1, $bg_color);
- imagealphablending($img,true);
-
- $textbox = imageftbbox($fsize, 0, $font, $word);
- $x = ($w - ($textbox[2] - $textbox[0])) / 2;
- $y = ($h - ($textbox[7] - $textbox[1])) / 2;
- imagefttext($img, $fsize, 0, $x, $y, $text_color, $font, $word);
-
- // generate noise
- for ($i=0; $i<$this->_dotNoiseLevel; $i++) {
- imagefilledellipse($img, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);
- }
- for($i=0; $i<$this->_lineNoiseLevel; $i++) {
- imageline($img, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);
- }
-
- // transformed image
- $img2 = imagecreatetruecolor($w, $h);
-
- imagealphablending($img2, false);
- $bg_color = imagecolorallocatealpha($img2,255,255,255,127);
- imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);
- imagealphablending($img2,true);
-
- // $bg_color = imagecolorallocate($img2, 255, 255, 255);
- // imagefilledrectangle($img2, 0, 0, $w-1, $h-1, $bg_color);
- // apply wave transforms
- $freq1 = $this->_randomFreq();
- $freq2 = $this->_randomFreq();
- $freq3 = $this->_randomFreq();
- $freq4 = $this->_randomFreq();
-
- $ph1 = $this->_randomPhase();
- $ph2 = $this->_randomPhase();
- $ph3 = $this->_randomPhase();
- $ph4 = $this->_randomPhase();
-
- $szx = $this->_randomSize();
- $szy = $this->_randomSize();
-
- for ($x = 0; $x < $w; $x++) {
- for ($y = 0; $y < $h; $y++) {
- $sx = $x + (sin($x*$freq1 + $ph1) + sin($y*$freq3 + $ph3)) * $szx;
- $sy = $y + (sin($x*$freq2 + $ph2) + sin($y*$freq4 + $ph4)) * $szy;
-
- if ($sx < 0 || $sy < 0 || $sx >= $w - 1 || $sy >= $h - 1) {
- continue;
- } else {
- $color = (imagecolorat($img, $sx, $sy) >> 16) & 0xFF;
- $color_x = (imagecolorat($img, $sx + 1, $sy) >> 16) & 0xFF;
- $color_y = (imagecolorat($img, $sx, $sy + 1) >> 16) & 0xFF;
- $color_xy = (imagecolorat($img, $sx + 1, $sy + 1) >> 16) & 0xFF;
- }
- if ($color == 255 && $color_x == 255 && $color_y == 255 && $color_xy == 255) {
- // ignore background
- continue;
- } elseif ($color == 0 && $color_x == 0 && $color_y == 0 && $color_xy == 0) {
- // transfer inside of the image as-is
- $newcolor = 0;
- } else {
- // do antialiasing for border items
- $frac_x = $sx-floor($sx);
- $frac_y = $sy-floor($sy);
- $frac_x1 = 1-$frac_x;
- $frac_y1 = 1-$frac_y;
-
- $newcolor = $color * $frac_x1 * $frac_y1
- + $color_x * $frac_x * $frac_y1
- + $color_y * $frac_x1 * $frac_y
- + $color_xy * $frac_x * $frac_y;
- }
- imagesetpixel($img2, $x, $y, imagecolorallocate($img2, $newcolor, $newcolor, $newcolor));
- }
- }
-
- // generate noise
- for ($i=0; $i<$this->_dotNoiseLevel; $i++) {
- imagefilledellipse($img2, mt_rand(0,$w), mt_rand(0,$h), 2, 2, $text_color);
- }
- for ($i=0; $i<$this->_lineNoiseLevel; $i++) {
- imageline($img2, mt_rand(0,$w), mt_rand(0,$h), mt_rand(0,$w), mt_rand(0,$h), $text_color);
- }
-
- // imagealphablending($img,false);
- imagealphablending($img2,false);
-
- imagesavealpha($img2,true);
-
- imagepng($img2, $img_file);
- imagedestroy($img);
- imagedestroy($img2);
- }
-
- }