Changeset 3031 for trunk/system/libraries/drivers/Captcha/Basic.php

Timestamp:

07/10/2008 11:06:23 AM (5 months ago)

Author:

Geert

Message:

A few minor tweaks to Basic and Alpha Captcha style in order to preserve enough readability and make both styles differ a bit more.

Also changed internal terminology to the "official" convention: http://en.wikipedia.org/wiki/Challenge-response_authentication

Files:

• trunk/system/libraries/drivers/Captcha/Basic.php (modified) (3 diffs)

trunk/system/libraries/drivers/Captcha/Basic.php

@@ -40 +40 @@
 
                 // Add a few random lines
-                for ($i = 0, $count = mt_rand(5, 10); $i < $count; $i++)
+                for ($i = 0, $count = mt_rand(5, Captcha::$config['complexity'] * 3); $i < $count; $i++)
                 {
-                        $color = imagecolorallocatealpha($this->image, mt_rand(100, 255), mt_rand(100, 255), mt_rand(100, 255), mt_rand(60, 120));
+                        $color = imagecolorallocatealpha($this->image, mt_rand(100, 255), mt_rand(100, 255), mt_rand(100, 255), mt_rand(50, 120));
                         imageline($this->image, mt_rand(0, Captcha::$config['width']), mt_rand(0, Captcha::$config['height']), mt_rand(0, Captcha::$config['width']), mt_rand(0, Captcha::$config['height']), $color);
                 }
 
                 // Calculate character font-size and spacing
-                $default_size = min(Captcha::$config['width'], Captcha::$config['height'] * 2) / (strlen(Captcha::$answer) + 1);
-                $spacing = (int) (Captcha::$config['width'] * 0.9 / strlen(Captcha::$answer));
+                $default_size = min(Captcha::$config['width'], Captcha::$config['height'] * 2) / (strlen(Captcha::$response) + 1);
+                $spacing = (int) (Captcha::$config['width'] * 0.9 / strlen(Captcha::$response));
 
                 // Draw each Captcha character with varying attributes
-                for ($i = 0, $strlen = strlen(Captcha::$answer); $i < $strlen; $i++)
+                for ($i = 0, $strlen = strlen(Captcha::$response); $i < $strlen; $i++)
                 {
                         // Allocate random color, size and rotation attributes to text
@@ -59 +59 @@
                         // Scale the character size on image height
                         $size = $default_size / 10 * mt_rand(8, 12);
-                        $box = imageftbbox($size, $angle, Captcha::$config['font'], Captcha::$answer[$i]);
+                        $box = imageftbbox($size, $angle, Captcha::$config['font'], Captcha::$response[$i]);
 
                         // Calculate character starting coordinates
@@ -66 +66 @@
 
                         // Write text character to image
-                        imagefttext($this->image, $size, $angle, $x, $y, $color, Captcha::$config['font'], Captcha::$answer[$i]);
+                        imagefttext($this->image, $size, $angle, $x, $y, $color, Captcha::$config['font'], Captcha::$response[$i]);
                 }