diff options
Diffstat (limited to 'phpBB/includes/captcha/captcha_gd_wave.php')
| -rw-r--r-- | phpBB/includes/captcha/captcha_gd_wave.php | 45 |
1 files changed, 24 insertions, 21 deletions
diff --git a/phpBB/includes/captcha/captcha_gd_wave.php b/phpBB/includes/captcha/captcha_gd_wave.php index d911d574f7..f706c98d43 100644 --- a/phpBB/includes/captcha/captcha_gd_wave.php +++ b/phpBB/includes/captcha/captcha_gd_wave.php @@ -1,16 +1,18 @@ <?php -/** +/** * * @package VC * @version $Id$ -* @copyright (c) 2006 phpBB Group -* @license http://opensource.org/licenses/gpl-license.php GNU Public License +* @copyright (c) 2006 phpBB Group +* @license http://opensource.org/licenses/gpl-license.php GNU Public License * */ - -/** -* Wave3D CAPTCHA by Robert Hetzler +/** +* Wave3D CAPTCHA +* +* @author Robert Hetzler +* @package VC */ class captcha { @@ -20,10 +22,10 @@ class captcha function execute($code, $seed) { global $starttime; - + // seed the random generator mt_srand($seed); - + // set height and width $img_x = $this->width; $img_y = $this->height; @@ -32,7 +34,7 @@ class captcha $img = imagecreatetruecolor($img_x, $img_y); $x_grid = mt_rand(6, 10); $y_grid = mt_rand(6, 10); - + // Ok, so lets cut to the chase. We could accurately represent this in 3d and // do all the appropriate linear transforms. my questions is... why bother? // The computational overhead is unnecessary when you consider the simple fact: @@ -47,28 +49,29 @@ class captcha $plane_x = 100; $plane_y = 30; - $subdivision_factor = 3; + $subdivision_factor = 3; + // $box is the 4 points in img_space that correspond to the corners of the plane in 3-space $box = array( 'upper_left' => array( 'x' => mt_rand(5, 15), 'y' => mt_rand(10, 15) - ), + ), 'upper_right' => array( 'x' => mt_rand($img_x - 35, $img_x - 19), 'y' => mt_rand(10, 17) - ), + ), 'lower_left' => array( 'x' => mt_rand($img_x - 5, $img_x - 45), 'y' => mt_rand($img_y - 0, $img_y - 15) - ), + ), ); + $box['lower_right'] = array( - 'x' => $box['lower_left']['x'] + $box['upper_left']['x'] - $box['upper_right']['x'], - 'y' => $box['lower_left']['y'] + $box['upper_left']['y'] - $box['upper_right']['y'], + 'x' => $box['lower_left']['x'] + $box['upper_left']['x'] - $box['upper_right']['x'], + 'y' => $box['lower_left']['y'] + $box['upper_left']['y'] - $box['upper_right']['y'], ); - // TODO $background = imagecolorallocate($img, mt_rand(155, 255), mt_rand(155, 255), mt_rand(155, 255)); imagefill($img, 0, 0, $background); @@ -83,7 +86,7 @@ class captcha } $fontcolors[0] = imagecolorallocate($img, mt_rand(0, 120), mt_rand(0, 120), mt_rand(0, 120)); - + $colors = array(); $minr = mt_rand(20, 30); @@ -159,7 +162,7 @@ class captcha $cur_height = $this->wave_height($x, 0, $subdivision_factor); $offset = $cur_height - $prev_height; $img_pos_cur = array($img_pos_prev[0] + $dxx, $img_pos_prev[1] + $dxy + $offset); - + $img_buffer[0][$x] = $img_pos_cur; $img_pos_prev = $img_pos_cur; $prev_height = $cur_height; @@ -170,7 +173,7 @@ class captcha // swap buffers $buffer_cur = $y & 1; $buffer_prev = 1 - $buffer_cur; - + $prev_height = $this->wave_height(0, $y, $subdivision_factor); $offset = $prev_height - $this->wave_height(0, $y - 1, $subdivision_factor); $img_pos_cur = array($img_buffer[$buffer_prev][0][0] + $dyx, min($img_buffer[$buffer_prev][0][1] + $dyy + $offset, $img_y - 1)); @@ -179,7 +182,7 @@ class captcha $img_pos_prev = $img_pos_cur; $img_buffer[$buffer_cur][0] = $img_pos_cur; - + for ($x = 1; $x <= $full_x; ++$x) { $cur_height = $this->wave_height($x, $y, $subdivision_factor) + $this->grid_height($x, $y, 1, $x_grid, $y_grid); @@ -496,7 +499,7 @@ class captcha array(0,0,0,0,0,0,0,0,0), array(0,0,0,0,0,0,0,0,0), array(0,0,0,0,0,0,0,0,0), - ), + ), 'O' => array( array(0,0,0,1,1,1,0,0,0), array(0,0,1,0,0,0,1,0,0), |