function _image_captcha_settings_form in CAPTCHA 5.3

Helper function for the configuration form for image_captcha Called by image_captcha_settings_form() (which determines the real form_id 'image_captcha_settings_form')

1 call to _image_captcha_settings_form()

image_captcha_settings_form in image_captcha/image_captcha.module

Configuration form for image_captcha Implemented by _image_captcha_settings_form() in image_captcha.admin.inc

File

image_captcha/image_captcha.admin.inc, line 31

Implementation of the administration UI of the image CAPTCHA module.

Code

function _image_captcha_settings_form() {
  if (!function_exists('imagejpeg')) {
    drupal_set_message(t('Images cannot be generated, because your PHP installation\'s GD library has no JPEG support.'), 'error');
  }
  $form = array();
  $form['image_captcha_code_settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('Code settings'),
  );
  $form['image_captcha_code_settings']['image_captcha_image_allowed_chars'] = array(
    '#type' => 'textfield',
    '#title' => t('Characters to use in the code'),
    '#default_value' => variable_get('image_captcha_image_allowed_chars', IMAGE_CAPTCHA_ALLOWED_CHARACTERS),
  );
  $form['image_captcha_code_settings']['image_captcha_code_length'] = array(
    '#type' => 'select',
    '#title' => t('Code length'),
    '#options' => array(
      2 => 2,
      3,
      4,
      5,
      6,
      7,
      8,
      9,
      10,
    ),
    '#default_value' => (int) variable_get('image_captcha_code_length', 5),
    '#description' => t('The code length influences the size of the image. Note that larger values make the image generation more CPU intensive.'),
  );

  // Option fo case insensitive validation
  $form['image_captcha_code_settings']['image_captcha_case_insensitive'] = array(
    '#type' => 'checkbox',
    '#title' => t('Case insensitive validation'),
    '#description' => t('Enable this option to ignore uppercase/lowercase errors in the response. This can be usefull for adapting the challenge to your audience or for certain fonts where the differences between upper and lower case are too small.'),
    '#default_value' => variable_get('image_captcha_case_insensitive', FALSE),
  );

  // font related stuff
  $form['image_captcha_font_settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('Font settings'),
  );
  $available_fonts = _image_captcha_available_fonts();
  list($default_font, $errmsg) = _image_captcha_get_font();
  $form['image_captcha_font_settings']['image_captcha_font'] = array(
    '#type' => 'select',
    '#title' => t('Font'),
    '#default_value' => $default_font,
    '#description' => t('The TrueType font (.ttf) to use for the text in the image CAPTCHA.'),
    '#options' => $available_fonts,
  );

  // add a prerender procedure for checking that a font should be set.
  $form['#pre_render'] = array(
    'image_captcha_settings_form_pre_render',
  );

  // font size
  if ($default_font != 'BUILTIN') {
    $form['image_captcha_font_settings']['image_captcha_font_size'] = array(
      '#type' => 'select',
      '#title' => t('Font size'),
      '#options' => array(
        12 => t('tiny'),
        20 => t('small'),
        30 => t('normal'),
        40 => t('large'),
      ),
      '#default_value' => (int) variable_get('image_captcha_font_size', 30),
      '#description' => t('The font size influences the size of the image. Note that larger values make the image generation more CPU intensive.'),
    );
  }

  // character spacing
  $form['image_captcha_font_settings']['image_captcha_character_spacing'] = array(
    '#type' => 'select',
    '#title' => t('Character spacing'),
    '#description' => t('Define the average spacing between characters. Note that larger values make the image generation more CPU intensive.'),
    '#default_value' => variable_get('image_captcha_character_spacing', '1.2'),
    '#options' => array(
      '1' => t('small'),
      '1.2' => t('normal'),
      '1.5' => t('large'),
    ),
  );

  // color settings
  $form['image_captcha_color_settings'] = array(
    '#type' => 'fieldset',
    '#title' => t('Color settings'),
    '#description' => t('Configuration of the background and text colors in the image CAPTCHA.'),
  );
  $form['image_captcha_color_settings']['image_captcha_background_color'] = array(
    '#type' => 'textfield',
    '#title' => t('Background color'),
    '#description' => t('Enter the hexadecimal code for the background color (e.g. #FFF or #FFCE90).'),
    '#default_value' => variable_get('image_captcha_background_color', '#ffffff'),
    '#maxlength' => 7,
    '#size' => 8,
  );
  $form['image_captcha_color_settings']['image_captcha_foreground_color'] = array(
    '#type' => 'textfield',
    '#title' => t('Text color'),
    '#description' => t('Enter the hexadecimal code for the text color (e.g. #000 or #004283).'),
    '#default_value' => variable_get('image_captcha_foreground_color', '#000000'),
    '#maxlength' => 7,
    '#size' => 8,
  );
  $form['image_captcha_color_settings']['image_captcha_foreground_color_randomness'] = array(
    '#type' => 'select',
    '#title' => t('Additional variation of text color'),
    '#options' => array(
      0 => t('none'),
      50 => t('small'),
      100 => t('moderate'),
      150 => t('high'),
      200 => t('very high'),
    ),
    '#default_value' => (int) variable_get('image_captcha_foreground_color_randomness', 100),
    '#description' => t('The different characters will have randomized colors in the specified range around the text color.'),
  );

  // distortion and noise settings
  $form['image_captcha_distortion_and_noise'] = array(
    '#type' => 'fieldset',
    '#title' => t('Distortion and noise'),
    '#description' => t('With these settings you can control the degree of obfuscation by distortion and added noise. Do not exaggerate the obfuscation and assure that the code in the image is reasonably readable. For example, do not combine high levels of distortion and noise.'),
  );

  // distortion
  $form['image_captcha_distortion_and_noise']['image_captcha_distortion_amplitude'] = array(
    '#type' => 'select',
    '#title' => t('Distortion level'),
    '#options' => array(
      0 => t('none'),
      2 => t('low'),
      4 => t('moderate'),
      6 => t('normal'),
      8 => t('high'),
      10 => t('severe'),
    ),
    '#default_value' => (int) variable_get('image_captcha_distortion_amplitude', 6),
    '#description' => t('Set the degree of wave distortion in the image.'),
  );
  $form['image_captcha_distortion_and_noise']['image_captcha_bilinair_interpolation'] = array(
    '#type' => 'checkbox',
    '#title' => t('Smooth distortion'),
    '#default_value' => variable_get('image_captcha_bilinair_interpolation', FALSE),
    '#description' => t('This option enables bilinear interpolation of the distortion which makes the image look smoother, but it is more CPU intensive.'),
  );

  //double vision
  $form['image_captcha_distortion_and_noise']['image_captcha_double_vision'] = array(
    '#type' => 'checkbox',
    '#title' => t('Double vision'),
    '#default_value' => variable_get('image_captcha_double_vision', 0),
    '#description' => t('When enabled, characters appear twice in the image, overlaid onto each other.'),
  );

  // noise
  $form['image_captcha_distortion_and_noise']['image_captcha_dot_noise'] = array(
    '#type' => 'checkbox',
    '#title' => t('Add salt and pepper noise'),
    '#default_value' => variable_get('image_captcha_dot_noise', 0),
    '#description' => t('This option adds randomly colored point noise.'),
  );
  $form['image_captcha_distortion_and_noise']['image_captcha_line_noise'] = array(
    '#type' => 'checkbox',
    '#title' => t('Add line noise'),
    '#default_value' => variable_get('image_captcha_line_noise', 0),
    '#description' => t('This option enables lines randomly drawn on top of the text code.'),
  );
  $form['image_captcha_distortion_and_noise']['image_captcha_noise_level'] = array(
    '#type' => 'select',
    '#title' => t('Noise level'),
    '#options' => array(
      2 => t('low'),
      5 => t('normal'),
      7 => t('high'),
      10 => t('severe'),
    ),
    '#default_value' => (int) variable_get('image_captcha_noise_level', 5),
  );
  return system_settings_form($form);
}