TagCloudDashlet.php
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<?php
/**
* $Id: TagCloudDashlet.php,v 1.1 2006/02/28 16:53:49 nbm Exp $
*
* Copyright (c) 2007 Jam Warehouse http://www.jamwarehouse.com
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; using version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* -------------------------------------------------------------------------
*
* You can contact the copyright owner regarding licensing via the contact
* details that can be found on the KnowledgeTree web site:
*
* http://www.knowledgetree.com/
*/
require_once(KT_LIB_DIR . '/browse/browseutil.inc.php');
require_once(KT_LIB_DIR . '/plugins/pluginregistry.inc.php');
require_once(KT_LIB_DIR . '/plugins/plugin.inc.php');
class TagCloudDashlet extends KTBaseDashlet {
var $oUser;
var $sClass = 'ktBlock';
/**
* Constructor method
*
* @return TagCloudDashlet
*/
function TagCloudDashlet(){
$this->sTitle = _kt('Tag Cloud');
}
/**
* Check to see if user is active
*
* @param object $oUser
* @return boolean
*/
function is_active($oUser) {
$this->oUser = $oUser;
return true;
}
/**
* Render function for template
*
* @return unknown
*/
function render() {
$oTemplating =& KTTemplating::getSingleton();
$oTemplate = $oTemplating->loadTemplate('TagCloud/dashlet');
$aTags = & $this->get_relevant_tags();
$aTags = & $this->get_tag_weightings($aTags);
$oRegistry =& KTPluginRegistry::getSingleton();
$oPlugin =& $oRegistry->getPlugin('ktcore.tagcloud.plugin');
$url = $oPlugin->getPagePath('TagCloudRedirection');
$aTemplateData = array(
'tags' => $aTags,
'url'=>$url
);
return $oTemplate->render($aTemplateData);
}
/**
* Builds the weightings for tags based on their frequency
*
* @param array $aTags
* @return array
*/
function & get_tag_weightings(&$aTags)
{
$aTags = $this->get_relevant_tags();
if (count($aTags) == 0) $min_freq=$max_freq=0;
else
{
$min_freq = min(array_values($aTags));
$max_freq = max(array_values($aTags));
}
$min_size = 12;
$max_size = 30;
$distrib = $max_freq - $min_freq;
if ($distrib == 0) $distrib=1;
$step = ($max_size - $min_size)/($distrib);
foreach($aTags as $tag=>$freq)
{
$size = ceil($min_size + (($freq - $min_freq) * $step));
$aTags[$tag] = $size;
}
return $aTags;
}
/**
* Returns the relevant tags for the current user
*
* @return array
*/
function & get_relevant_tags()
{
list($where, $params, $joins) = KTSearchUtil::permissionToSQL($this->oUser, null);
$sql = "
SELECT
tw.tag, count(*) as freq
FROM
document_tags dt INNER JOIN tag_words tw ON dt.tag_id=tw.id
WHERE dt.document_id in (SELECT d.id FROM documents d $joins WHERE $where) GROUP BY tw.tag";
$tags = DBUtil::getResultArray(
array($sql,$params)
);
$aTags = array();
foreach($tags as $tag)
{
$word=$tag['tag'];
$freq=$tag['freq'];
$aTags[$word] = $freq;
}
return $aTags;
}
}
?>