/**
* answer the tag cloud html
*
* @param object Iterator $tags
* @param optional string $viewAction The action to use when clicking on a tag.
* Usually view or viewuser
* @param optional array $styles An array of style-strings to use for various
* levels of of tag occurrances.
* @param optional array $additionalParams An array of parameters to pass in the same namespace
* @param optional array $additionalNamespacedParams A two-dimensional array. Keys of the top
* array are the namespaces, the values of the top array are arrays
* of key/value pairs in that namespace.
* @return string
* @access public
* @static
* @since 11/7/06
*/
static function getTagCloud($tags, $viewAction = 'view', $styles = null, $additionalParams = null, array $additionalNamespacedParams = array())
{
ob_start();
if ($tags->hasNext()) {
$harmoni = Harmoni::instance();
$harmoni->request->startNamespace("polyphony-tags");
$tagArray = array();
$occArray = array();
$nameArray = array();
$tag = $tags->next();
$tagArray[] = $tag;
$nameArray[] = $tag->getValue();
$occArray[] = $tag->getOccurances();
$minFreq = $maxFreq = $tag->getOccurances();
while ($tags->hasNext()) {
$tag = $tags->next();
$tagArray[] = $tag;
$nameArray[] = $tag->getValue();
$occArray[] = $tag->getOccurances();
if ($tag->getOccurances() < $minFreq) {
$minFreq = $tag->getOccurances();
}
if ($tag->getOccurances() > $maxFreq) {
$maxFreq = $tag->getOccurances();
}
}
if (!is_array($styles)) {
$styles = TagAction::getDefaultStyles();
}
// First Try to get a meaningful Standard Deviation
$incrementSize = TagAction::deviation($occArray);
// If there are only two results, try this method
if (!$incrementSize) {
$incrementSize = ceil(($maxFreq - $minFreq) / count($styles));
}
// If we still don't have an increment size, use 1
if (!$incrementSize) {
$incrementSize = 1;
}
// printpre(TagAction::average($occArray));
// printpre($incrementSize);
array_multisort($nameArray, $tagArray);
for ($key = 0; $key < count($tagArray); $key++) {
$tag = $tagArray[$key];
$group = -1;
for ($i = $minFreq; $i <= $tag->getOccurances() && $group < count($styles) - 1; $i = $i + $incrementSize) {
$group++;
}
$group = max(0, $group);
$style = $styles[$group];
$url = $harmoni->request->mkURL('tags', $viewAction);
if (RequestContext::value('agent_id')) {
$url->setValue('agent_id', RequestContext::value('agent_id'));
}
if (is_array($additionalParams)) {
foreach ($additionalParams as $name => $value) {
$url->setValue($name, $value);
}
}
foreach ($additionalNamespacedParams as $namespace => $params) {
$harmoni->request->startNamespace($namespace);
foreach ($params as $name => $value) {
$url->setValue($name, $value);
}
$harmoni->request->endNamespace();
}
$url->setValue("tag", $tag->getValue());
print "\n\t<a rel='tag' href='" . $url->write() . "' ";
print " title=\"";
// print $group." ";
// print str_replace('%2', $tag->getValue(),
// str_replace('%1', $tag->getOccurances(),
// _("View (%1) items tagged with '%2'")));
print str_replace('%2', $tag->getOccurances(), str_replace('%1', $tag->getValue(), _("View items tagged with '%1'. ") . "(" . _("Frequency") . ": %2)"));
// span styles cloudStyle, rel and frequency NOT validating
print "\" style='" . $style . "'";
print " class='tag_cloud_group_" . $group . " tag_frequency_" . $tag->getOccurances() . "'";
print ">";
print $tag->getValue() . "</a> ";
}
$harmoni->request->endNamespace();
}
return ob_get_clean();
}
