Added "length" option and changed the parameters names

DependencyInjection/Configuration.php

@@ -17,15 +17,12 @@ class Configuration implements ConfigurationInterface
         $rootNode = $treeBuilder->root('gregwar_captcha', 'array');
         
         $rootNode
-            ->children()
-                ->arrayNode('image')
             ->addDefaultsIfNotSet()
             ->children()
+                ->scalarNode('length')->defaultValue(5)->end()
                 ->scalarNode('width')->defaultValue(120)->end()
                 ->scalarNode('height')->defaultValue(40)->end()
             ->end()
-                ->end()
-            ->end()
         ;
         return $treeBuilder;
     }

DependencyInjection/GregwarCaptchaExtension.php

@@ -19,8 +19,10 @@ class GregwarCaptchaExtension extends Extension
         $configuration = new Configuration();
         $config = $this->processConfiguration($configuration, $configs);
 
-        $container->setParameter('gregwar_captcha.image.height', $config['image']['height']);
-        $container->setParameter('gregwar_captcha.image.width', $config['image']['width']);
+        $container->setParameter('gregwar_captcha.length', $config['length']);
+        $container->setParameter('gregwar_captcha.height', $config['height']);
+        $container->setParameter('gregwar_captcha.width', $config['width']);
+
         $resources = $container->getParameter('twig.form.resources');
         $container->setParameter('twig.form.resources',array_merge(array('GregwarCaptchaBundle::captcha.html.twig'), $resources));
         

Generator/CaptchaGenerator.php

@@ -41,7 +41,7 @@ class CaptchaGenerator {
         }
 
         // Write CAPTCHA text
-        $size = $width/5.0;
+        $size = $width/strlen($this->value);
         $font = __DIR__.'/Font/captcha.ttf';
         $box = imagettfbbox($size, 0, $font, $this->value);
         $txt_width = $box[2] - $box[0];

Resources/config/services.yml

@@ -3,6 +3,6 @@ services:
     # captcha type
     captcha.type:
         class: Gregwar\CaptchaBundle\Type\CaptchaType
-        arguments: [@session, %gregwar_captcha.image.width%, %gregwar_captcha.image.height%]
+        arguments: [@session, %gregwar_captcha.width%, %gregwar_captcha.height%, %gregwar_captcha.length%]
         tags:
             - { name: form.type, alias: captcha }

Type/CaptchaType.php

@@ -33,6 +33,12 @@ class CaptchaType extends AbstractType
      */
     protected $height;
 
+    /**
+     * The code length
+     * @var integer
+     */
+    protected $length;
+
     /** 
      * The session
      * @var Symfony\Component\HttpFoundation\Session
@@ -42,12 +48,12 @@ class CaptchaType extends AbstractType
     private $key = 'captcha';
 
 
-    public function __construct(Session $session, $width, $height)
+    public function __construct(Session $session, $width, $height, $length)
     {
         $this->session = $session;
         $this->width = $width;
         $this->height = $height;
-        
+        $this->length = $length;
     }
 
     public function buildForm(FormBuilder $builder, array $options)
@@ -70,12 +76,18 @@ class CaptchaType extends AbstractType
     {
         if (isset($options['width'])) {
             $this->width = $options['width'];
+        }
+        if (isset($options['height'])) {
             $this->height = $options['height'];
         }
+        if (isset($options['length'])) {
+            $this->length = $options['length'];
+        }
 
         return array(
             'width' => $this->width,
-            'height' => $this->height
+            'height' => $this->height,
+            'length' => $this->length
         );
     }
 
@@ -95,7 +107,7 @@ class CaptchaType extends AbstractType
         $value = '';
         $chars = str_split($charset);
 
-        for ($i=0; $i<5; $i++) {
+        for ($i=0; $i<$this->length; $i++) {
             $value.= $chars[array_rand($chars)];
         }