diff options
Diffstat (limited to 'system/libraries/drivers/Captcha/Black.php')
| -rw-r--r-- | system/libraries/drivers/Captcha/Black.php | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/system/libraries/drivers/Captcha/Black.php b/system/libraries/drivers/Captcha/Black.php new file mode 100644 index 00000000..6a2e2226 --- /dev/null +++ b/system/libraries/drivers/Captcha/Black.php @@ -0,0 +1,72 @@ +<?php defined('SYSPATH') OR die('No direct access allowed.'); +/** + * Captcha driver for "black" style. + * + * $Id: Black.php 3769 2008-12-15 00:48:56Z zombor $ + * + * @package Captcha + * @author Kohana Team + * @copyright (c) 2007-2008 Kohana Team + * @license http://kohanaphp.com/license.html + */ +class Captcha_Black_Driver extends Captcha_Driver { + + /** + * Generates a new Captcha challenge. + * + * @return string the challenge answer + */ + public function generate_challenge() + { + // Complexity setting is used as character count + return text::random('distinct', max(1, ceil(Captcha::$config['complexity'] / 1.5))); + } + + /** + * Outputs the Captcha image. + * + * @param boolean html output + * @return mixed + */ + public function render($html) + { + // Creates a black image to start from + $this->image_create(Captcha::$config['background']); + + // Add random white/gray arcs, amount depends on complexity setting + $count = (Captcha::$config['width'] + Captcha::$config['height']) / 2; + $count = $count / 5 * min(10, Captcha::$config['complexity']); + for ($i = 0; $i < $count; $i++) + { + imagesetthickness($this->image, mt_rand(1, 2)); + $color = imagecolorallocatealpha($this->image, 255, 255, 255, mt_rand(0, 120)); + imagearc($this->image, mt_rand(-Captcha::$config['width'], Captcha::$config['width']), mt_rand(-Captcha::$config['height'], Captcha::$config['height']), mt_rand(-Captcha::$config['width'], Captcha::$config['width']), mt_rand(-Captcha::$config['height'], Captcha::$config['height']), mt_rand(0, 360), mt_rand(0, 360), $color); + } + + // Use different fonts if available + $font = Captcha::$config['fontpath'].Captcha::$config['fonts'][array_rand(Captcha::$config['fonts'])]; + + // Draw the character's white shadows + $size = (int) min(Captcha::$config['height'] / 2, Captcha::$config['width'] * 0.8 / strlen($this->response)); + $angle = mt_rand(-15 + strlen($this->response), 15 - strlen($this->response)); + $x = mt_rand(1, Captcha::$config['width'] * 0.9 - $size * strlen($this->response)); + $y = ((Captcha::$config['height'] - $size) / 2) + $size; + $color = imagecolorallocate($this->image, 255, 255, 255); + imagefttext($this->image, $size, $angle, $x + 1, $y + 1, $color, $font, $this->response); + + // Add more shadows for lower complexities + (Captcha::$config['complexity'] < 10) and imagefttext($this->image, $size, $angle, $x - 1, $y - 1, $color, $font , $this->response); + (Captcha::$config['complexity'] < 8) and imagefttext($this->image, $size, $angle, $x - 2, $y + 2, $color, $font , $this->response); + (Captcha::$config['complexity'] < 6) and imagefttext($this->image, $size, $angle, $x + 2, $y - 2, $color, $font , $this->response); + (Captcha::$config['complexity'] < 4) and imagefttext($this->image, $size, $angle, $x + 3, $y + 3, $color, $font , $this->response); + (Captcha::$config['complexity'] < 2) and imagefttext($this->image, $size, $angle, $x - 3, $y - 3, $color, $font , $this->response); + + // Finally draw the foreground characters + $color = imagecolorallocate($this->image, 0, 0, 0); + imagefttext($this->image, $size, $angle, $x, $y, $color, $font, $this->response); + + // Output + return $this->image_render($html); + } + +} // End Captcha Black Driver Class
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