From eba717f95f586d2538007bd18da6e9b32b076c30 Mon Sep 17 00:00:00 2001
From: Bharat Mediratta <bharat@menalto.com>
Date: Fri, 31 Oct 2008 22:12:14 +0000
Subject: Merge over vendor code.

git-svn-id: http://gallery.svn.sourceforge.net/svnroot/gallery/trunk/eval/gx/gallery3/trunk@18408 57fcd75e-5312-0410-8df3-f5eb6fbb1595
---
 kohana/libraries/drivers/Captcha/Black.php | 72 ++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 kohana/libraries/drivers/Captcha/Black.php

(limited to 'kohana/libraries/drivers/Captcha/Black.php')

diff --git a/kohana/libraries/drivers/Captcha/Black.php b/kohana/libraries/drivers/Captcha/Black.php
new file mode 100644
index 00000000..6f1997e9
--- /dev/null
+++ b/kohana/libraries/drivers/Captcha/Black.php
@@ -0,0 +1,72 @@
+<?php defined('SYSPATH') or die('No direct script access.');
+/**
+ * Captcha driver for "black" style.
+ *
+ * $Id$
+ *
+ * @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
\ No newline at end of file
-- 
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