And now I would tell you how to show tag cloud in a block.

Solutions

• Use a snippet to show tag cloud for a specified vocabulary
• Use tagadelic module

Snippet to show tag cloud for a specified vocabulary

Shows tag cloud for a specified vocabulary – $voc variable.

<?php
$max_fontsize = 150; // Размер шрифта для тэга с максимальным весом
$min_fontsize = 90; // Размер шрифта для тэга с минимальным весом
$metrics = ‘%'; // в чем измеряется размер px,pt,em,%
$voc = 3; // vid словаря
// получим максимальны и минимальный вес терминов в словаре
$result = db_query(db_rewrite_sql(“SELECT max(cnt) AS maxcnt,min(cnt) AS mincnt
FROM {term_data} td  INNER JOIN
(SELECT tn.tid,COUNT(tn.nid) as cnt  FROM {term_node} tn
INNER JOIN {node} n ON n.nid=tn.nid GROUP BY tn.tid) n
ON n.tid=td.tid AND td.vid=%d”),$voc);
$term = db_fetch_object($result);
$min_weight = $term->mincnt;
$max_weight = $term->maxcnt;
// вычислим коэффициент для размера шрифта
if ($min_weight == $max_weight ) {
$font_metric_koof = 0;
}
else {
$font_metric_koof = ($max_fontsize – $min_fontsize) / ($max_weight – $min_weight);
}
$result = db_query(db_rewrite_sql(“SELECT td.tid,td.name,n.cnt
FROM {term_data} td  INNER JOIN
(SELECT tn.tid,COUNT(tn.nid) as cnt  FROM {term_node} tn
INNER JOIN {node} n ON n.nid=tn.nid GROUP BY tn.tid) n
ON n.tid=td.tid AND td.vid=%d ORDER BY td.name”),$voc);
$tags = ”;
while($term = db_fetch_object($result)) {
$size = $min_fontsize + ($term->cnt – $min_weight) * $font_metric_koof;
$style = ‘font-size: ‘.$size.$metrics.';';
$tags .= l($term->name,’taxonomy/term/’.$term->tid,
array(‘attributes’ => array(‘style’ => $style,’class’ => ‘tags-voc-‘.$voc))).’ ‘;
}
if (!empty($tags)) {
print ‘<tags class=”voc-‘.$voc.'”>’.$tags.'</tags>';
}
?>

Themization
For themization of a.tags-voc-vocabulary-number terms, you can use tags.voc-vocabulary-number stylization.

tagadelic module

• Install Tagadelic module (http://drupal.org/project/tagadelic)
• Enable block with tag cloud on the page of blocks settings for the required vocabulary.