Changeset 3027

Timestamp:

07/10/2008 05:20:53 AM (5 months ago)

Author:

Geert

Message:

Finished Basic Captcha Driver, and the image_gradient helper method.

Location:

trunk/system

Files:

• controllers/captcha.php (modified) (1 diff)
• libraries/Captcha.php (modified) (1 diff)
• libraries/drivers/Captcha.php (modified) (6 diffs)
• libraries/drivers/Captcha/Basic.php (modified) (1 diff)

trunk/system/controllers/captcha.php

@@ -17 +17 @@
         {
                 // Output the Captcha challenge resource (no html)
-                $captcha = new Captcha;
-                $captcha->render(FALSE);
+                Captcha::factory()->render(FALSE);
         }
 

trunk/system/libraries/Captcha.php

@@ -144 +144 @@
          *
          * @param   boolean  TRUE to output html, e.g. <img src="#" />
-         * @return  mixed
+         * @return  mixed    html string or void
          */
         public function render($html = TRUE)

trunk/system/libraries/drivers/Captcha.php

@@ -13 +13 @@
 
         protected $image;              // Image resource identifier
-        protected $image_type = 'png'; // 'png', 'gif', or 'jpeg'
+        protected $image_type = 'png'; // 'png', 'gif' or 'jpeg'
 
         /**
@@ -71 +71 @@
          * If a background image is supplied, the image dimensions are used.
          *
-         * @chainable
          * @param   string  path to the background image file
-         * @return  object
+         * @return  void
          */
         public function image_create($background = NULL)
@@ -91 +90 @@
                         $this->image = imagecreatetruecolor(Captcha::$config['width'], Captcha::$config['height']);
                 }
-
-                return $this;
         }
 
@@ -98 +95 @@
          * Fills the background with a gradient.
          *
-         * @chainable
-         * @return  object
+         * @param   resource  gd image color identifier for start color
+         * @param   resource  gd image color identifier for end color
+         * @param   string    direction: 'horizontal' or 'vertical', 'random' by default
+         * @return  void
          */
-        public function image_gradient()
+        public function image_gradient($color1, $color2, $direction = NULL)
         {
-                // TODO: build
-                return $this;
+                $directions = array('horizontal', 'vertical');
+
+                // Pick a random direction if needed
+                if ( ! in_array($direction, $directions))
+                {
+                        $direction = $directions[array_rand($directions)];
+
+                        // Switch colors
+                        if (mt_rand(0, 1) === 1)
+                        {
+                                $temp = $color1;
+                                $color1 = $color2;
+                                $color2 = $temp;
+                        }
+                }
+
+                // Extract RGB values
+                $color1 = imagecolorsforindex($this->image, $color1);
+                $color2 = imagecolorsforindex($this->image, $color2);
+
+                // Preparations for the gradient loop
+                $steps = ($direction === 'horizontal') ? Captcha::$config['width'] : Captcha::$config['height'];
+
+                $r1 = ($color1['red'] - $color2['red']) / $steps;
+                $g1 = ($color1['green'] - $color2['green']) / $steps;
+                $b1 = ($color1['blue'] - $color2['blue']) / $steps;
+
+                if ($direction === 'horizontal')
+                {
+                        $x1 =& $i;
+                        $y1 = 0;
+                        $x2 =& $i;
+                        $y2 = Captcha::$config['height'];
+                }
+                else
+                {
+                        $x1 = 0;
+                        $y1 =& $i;
+                        $x2 = Captcha::$config['width'];
+                        $y2 =& $i;
+                }
+
+                // Execute the gradient loop
+                for ($i = 0; $i <= $steps; $i++)
+                {
+                        $r2 = $color1['red'] - floor($i * $r1);
+                        $g2 = $color1['green'] - floor($i * $g1);
+                        $b2 = $color1['blue'] - floor($i * $b1);
+                        $color = imagecolorallocate($this->image, $r2, $g2, $b2);
+
+                        imageline($this->image, $x1, $y1, $x2, $y2, $color);
+                }
         }
 
@@ -110 +159 @@
          * Outputs the image to the browser.
          *
-         * @return  void
+         * @param   boolean  html output
+         * @return  mixed    html string or void
          */
-        public function image_output()
+        public function image_render($html)
         {
+                // Output html element
+                if ($html)
+                        return '<img alt="Captcha" src="'.url::site('captcha').'" width="'.Captcha::$config['width'].'" height="'.Captcha::$config['height'].'" />';
+
                 // Send the correct HTTP header
                 header('Content-Type: image/'.$this->image_type);
@@ -125 +179 @@
         }
 
-        /**
-         * Generates html img element.
-         *
-         * @return  string
-         */
-        public function image_html()
-        {
-                return '<img alt="Captcha" src="'.url::site('captcha').'" width="'.Captcha::$config['width'].'" height="'.Captcha::$config['height'].'" />';
-        }
-
 } // End Captcha Driver

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

@@ -34 +34 @@
                 $this->image_create(Captcha::$config['background']);
 
-                // TODO: everything, font-size, spacing, colors, background, etc.
-                $color = imagecolorexact($this->image, 255, 255, 255);
-                imagefttext($this->image, 20, 5, 10, 40, $color, Captcha::$config['font'], Captcha::$answer);
+                // Add a random gradient
+                $color1 = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
+                $color2 = imagecolorallocate($this->image, mt_rand(0, 100), mt_rand(0, 100), mt_rand(0, 100));
+                $this->image_gradient($color1, $color2);
+
+                // Add a few random lines
+                for ($i = 0, $count = mt_rand(5, 10); $i < $count; $i++)
+                {
+                        $color = imagecolorallocatealpha($this->image, mt_rand(100, 255), mt_rand(100, 255), mt_rand(100, 255), mt_rand(60, 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);
+                $spacing = (int) (Captcha::$config['width'] * 0.9 / strlen(Captcha::$answer));
+
+                // Draw each Captcha character with varying attributes
+                for ($i = 0, $strlen = strlen(Captcha::$answer); $i < $strlen; $i++)
+                {
+                        // Allocate random color, size and rotation attributes to text
+                        $color = imagecolorallocate($this->image, mt_rand(150, 255), mt_rand(200, 255), mt_rand(0, 255));
+                        $angle = mt_rand(-40, 20);
+
+                        // 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]);
+
+                        // Calculate character starting coordinates
+                        $x = $spacing / 4 + $i * $spacing;
+                        $y = Captcha::$config['height'] / 2 + ($box[2] - $box[5]) / 4;
+
+                        // Write text character to image
+                        imagefttext($this->image, $size, $angle, $x, $y, $color, Captcha::$config['font'], Captcha::$answer[$i]);
+                }
 
                 // Output
-                return ($html) ? $this->image_html() : $this->image_output();
+                return $this->image_render($html);
         }