md_wordcloud.module

<?php 
/**
 * Implements hook_block_info()
 */
function md_wordcloud_block_info() {
  $blocks = array();

  $taxonomy_vocabularies = taxonomy_get_vocabularies();
  if (is_array($taxonomy_vocabularies) && !empty($taxonomy_vocabularies)) {
    foreach ($taxonomy_vocabularies as $voc) {
      $blocks[$voc->vid]['info'] = 'Word Cloud in ' . $voc->name;
      $blocks[$voc->vid]['cache'] = DRUPAL_NO_CACHE;
    }
  }

  return $blocks;
}

/**
 * Implements hook_block_view()
 */
function md_wordcloud_block_view($delta = '') {
  $blocks_configure = variable_get('md_wordcloud_blocks_configure');
  if ($blocks_configure == NULL || !array_key_exists('block_' . $delta, $blocks_configure)) {
    return ;
  }

  $block_data = $blocks_configure['block_' . $delta];

  $number_words = $block_data['max_word'];
  $width = $block_data['width'];
  $height = $block_data['height'];
  $angle_from = $block_data['angle_from'];
  $angle_to = $block_data['angle_to'];
  $angle_count = $block_data['angle_count'];
  $words_scale = $block_data['words_scale'];
  $result = get_terms(array($delta), $number_words);

  global $base_url;

  drupal_add_js(drupal_get_path('module', 'md_wordcloud') . '/js/md_wordcloud.js');
  drupal_add_js(array('blocks_data' => array(array('block_id' => $delta, 'width' => $width, 'height' => $height, 'angle_from' => $angle_from, 'angle_to' => $angle_to, 'angle_count' => $angle_count, 'words_scale' => $words_scale, 'terms_url' => $result->terms_url, 'words' => $result->words, 'counts' => $result->counts))), 'setting');

  $blocks = array();
  if ($voc = taxonomy_vocabulary_load($delta)) {
    $blocks['subject'] = variable_get('md_wordcloud_block_title_' . $delta, t('Tags in @voc', array('@voc' => $voc->name)));
    $blocks['content'] = '<div id="terms-cloud-' . $delta . '" class="cloud-block"><svg></svg><div><a href="' . $base_url . '/md-taxonomy/page/' . $voc->vid . '">More</a></div></div>';
  }
  return $blocks;
}

/**
 * Implements hook_block_configure()
 */
function md_wordcloud_block_configure($delta = '') {
  $form = array();
  static $default_configure = array(
      'max_word' => 100,
      'width' => 300,
      'height' => 300,
      'angle_from' => -90,
      'angle_to' => 90,
      'angle_count' => 5,
      'words_scale' => 'linear',
  );

  $result = get_terms(array($delta));
  $blocks_configure = variable_get('md_wordcloud_blocks_configure');
  if ($blocks_configure == NULL || !array_key_exists('block_' . $delta, $blocks_configure)) {
    $block_data = $default_configure;
  }
  else {
    $block_data = $blocks_configure['block_' . $delta];
  }

  drupal_add_css(drupal_get_path('module', 'md_wordcloud') . '/css/md_wordcloud_preview.css');
  drupal_add_js(drupal_get_path('module', 'md_wordcloud') . '/js/md_wordcloud_preview.js');
  drupal_add_js(array('words' => $result->words, 'counts' => $result->counts), 'setting');

  $form['block_preview'] = array(
      '#markup' => '<div id="md-preview-wrap"><h3 class="preview-label">Preview</h3><div id="preview-md-taxonomy" class="cloud-preview"></div></div>',
  );

  $form['max_words'] = array(
      '#type' => 'textfield',
      '#title' => t('Max words to display'),
      '#default_value' => $block_data['max_word'],
  );

  $form['block_size'] = array(
      '#type' => 'label',
      '#title' => 'Block size',
  );

  $form['width'] = array(
      '#type' => 'textfield',
      '#title' => 'Width:',
      '#default_value' => $block_data['width'],
      '#prefix' => '<div class="md-angle">',
      '#field_suffix' => 'px',
  );

  $form['height'] = array(
      '#type' => 'textfield',
      '#title' => 'Height:',
      '#default_value' => $block_data['height'],
      '#suffix' => '</div><!-- /.md-angle -->',
      '#field_suffix' => 'px',
  );

  $form['words_scale'] = array(
      '#type' => 'radios',
      '#title' => t('Words scale'),
      '#options' => array('log' => t('log n'), 'sqrt' => t('√n'), 'linear' => t('n')),
      '#default_value' => $block_data['words_scale'],
  );

  $form['angle_count'] = array(
      '#type' => 'textfield',
      '#title' => t('Words orientation'),
      '#default_value' => $block_data['angle_count'],
      '#attributes' => array('min' => 0, 'max' => 100, ),
      '#prefix' => '<div class="md-angle">',
  );

  $form['angle_from'] = array(
      '#type' => 'textfield',
      '#title' => t('From:'),
      '#default_value' => $block_data['angle_from'],
      '#attributes' => array('min' => -90, 'max' => 90, ),
      '#field_suffix' => '&deg; to ',
  );

  $form['angle_to'] = array(
      '#type' => 'textfield',
      '#title' => t('to:'),
      '#attributes' => array('min' => -90, 'max' => 90, ),
      '#default_value' => $block_data['angle_to'],
      '#suffix' => '</div><!-- /.md-angle -->',
      '#field_suffix' => '&deg;',
  );

  $form['angle'] = array(
      '#markup' => '<div id="angles"></div>',
  );

  return $form;
}

/**
 * Implements hook_block_save()
 */
function md_wordcloud_block_save($delta = '', $edit = array()) {
  $blocks_configure = variable_get('md_wordcloud_blocks_configure', array());

  $block = array();
  $block['max_word'] = is_numeric($edit['max_words'])? $edit['max_words'] : 100;
  $block['width'] = is_numeric($edit['width']) ? $edit['width'] : 300;
  $block['height'] = is_numeric($edit['height']) ? $edit['height'] : 300;
  $block['angle_from'] = is_numeric($edit['angle_from']) ? $edit['angle_from'] : -90;
  $block['angle_to'] = is_numeric($edit['angle_to']) ? $edit['angle_to'] : 90;
  $block['angle_count'] = is_numeric($edit['angle_count']) ? $edit['angle_count'] : 5;
  $block['words_scale'] = $edit['words_scale'];

  $blocks_configure['block_' . $delta] = $block;
  variable_set('md_wordcloud_blocks_configure', $blocks_configure);
}

/**
 * Implements hook_menu()
 */
function md_wordcloud_menu() {
  $items = array();
  $items['md-taxonomy/page/%md_wordcloud_vocs'] = array(
      'title' => 'Word Cloud ',
      'page callback' => 'md_wordcloud_page_list',
      'page arguments' => array(2),
      'access callback' => 'user_access',
      'access arguments' => array('access content'),
      'type' => MENU_SUGGESTED_ITEM,
  );

  return $items;
}

/**
 * Generate page to display cloud tags
 * @param array $vocs_id - list vocabularies id
 * @return string block contains cloud data
 */
function md_wordcloud_page_list($vocs_id) {
  if (is_array($vocs_id)) {
    $results = get_terms($vocs_id);
    $blocks_configure = variable_get('md_wordcloud_blocks_configure');
    if ($blocks_configure == NULL || !array_key_exists('block_' . $vocs_id[0], $blocks_configure)) {
      return '<div id="page-terms"></div>';
    }

    $block_data = $blocks_configure['block_' . $vocs_id[0]];
    $setting = array(
        'terms_url' => $results->terms_url,
        'words' => $results->words,
        'counts' => $results->counts,
        'words_scale' => $block_data['words_scale'],
        'angle_count' => $block_data['angle_count'],
        'angle_from' => $block_data['angle_from'],
        'angle_to' => $block_data['angle_to'],
    );

    drupal_add_js(array('page_data' => $setting), 'setting');
  }

  drupal_add_js(drupal_get_path('module', 'md_wordcloud') . '/js/md_wordcloud_page.js');
  $term = taxonomy_vocabulary_load($vocs_id[0]);
  if ($term) {
    drupal_set_title(t('Word Cloud in ' . $term->name));
  }

  return '<div id="page-terms"></div>';
}

/**
 * Menu wildcard loader.
 */
function  md_wordcloud_vocs_load($vocs) {
  if (is_numeric($vocs)) {
    $vocs = array($vocs);
  }
  elseif (preg_match('/^([0-9]+,){1,5}[0-9]+$/', $vocs)) {
    $vocs = explode(',', $vocs);
  }
  return $vocs;
}

/**
 * Query to get terms  in database
 * Parameters: $vids - Array id of vocabularies
 * 						 $size - Number terms to get. Default is 100.
 * Return: Object contains terms, url's term, count's term.
 */
function get_terms($vids, $size = NULL) {
  global $base_url;
  $terms_url = array();
  $words = array();
  $counts = array();

  if (is_array($vids) && count($vids) > 0) {
    $string_query = 'SELECT COUNT(*) AS num, ttd.tid, ttd.vid, ttd.name, ttd.description FROM {taxonomy_term_data} ttd INNER JOIN {taxonomy_index} tind ON ttd.tid = tind.tid INNER JOIN {node} nod ON tind.nid = nod.nid WHERE ttd.vid IN (' . implode(',', array_fill(0, count($vids), '?')) . ') GROUP BY ttd.tid, ttd.vid, ttd.name, ttd.description HAVING COUNT(*) > 0 ORDER BY num DESC';

    if ($size) {
      $results = db_query_range($string_query, 0, $size, $vids);
    }
    else {
      $results = db_query($string_query, $vids);
    }

    foreach ($results as $tag) {
      $counts[] = $tag->num;
      $words[] =  $tag->name;
      $term_id = (object)array('tid' => $tag->tid);
      $org_url = taxonomy_term_uri($term_id);
      $url_alias = drupal_get_path_alias($org_url['path']);
      $terms_url[$tag->name] = $base_url . '/' . $url_alias;
    }

    $result = (object) array('terms_url' => $terms_url, 'words' => $words, 'counts' => $counts);
    return $result;
  }
}