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<?php
/*
* Copyright (C) 2008-2009 Alcatel-Lucent
*
* This file is part of FusionForge. FusionForge 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; either version 2 of the Licence, or (at your option)
* any later version.
*
* FusionForge 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 FusionForge; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
/*
* Standard Alcatel-Lucent disclaimer for contributing to open source
*
* "The Tag Cloud ("Contribution") has not been tested and/or
* validated for release as or in products, combinations with products or
* other commercial use. Any use of the Contribution is entirely made at
* the user's own responsibility and the user can not rely on any features,
* functionalities or performances Alcatel-Lucent has attributed to the
* Contribution.
*
* THE CONTRIBUTION BY ALCATEL-LUCENT IS PROVIDED AS IS, WITHOUT WARRANTY
* OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
* WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, COMPLIANCE,
* NON-INTERFERENCE AND/OR INTERWORKING WITH THE SOFTWARE TO WHICH THE
* CONTRIBUTION HAS BEEN MADE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL
* ALCATEL-LUCENT BE LIABLE FOR ANY DAMAGES OR OTHER LIABLITY, WHETHER IN
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* CONTRIBUTION OR THE USE OR OTHER DEALINGS IN THE CONTRIBUTION, WHETHER
* TOGETHER WITH THE SOFTWARE TO WHICH THE CONTRIBUTION RELATES OR ON A STAND
* ALONE BASIS."
*/
$NB_MAX = 20;
$NB_SIZE = 5;
$CLASS_PREFIX = 'tag';
$SELECTED_STYLE = 'style="text-decoration:overline underline;"';
/**
* tag_cloud() - This function displays a tag cloug with the tags defined by projects.
* The size of each tag depends of its frequency.
* Each tag is a link to display a list of projects where the tag is defined.
* Delta between two font sizes is constant :
* function is F(count) = size = A * count + B
* If:
* Smin = size min
* Smax = size max
* Cmin = count min
* Cmax = count max
* So:
* Smin = A * Cmin + B
* Smax = A * Cmax + B
* A = (Smax - Smin) / (Cmax - Cmin)
* B = Smin - A * Cmin
* If Smin = 1 then Smax = number of size = N
* So:
* A = (N - 1) / (Cmax - Cmin)
* B = 1 - A * Cmin
* F(count) = size = A * count + 1 - A * Cmin
* => size = 1 + (count - Cmin) * A
*
* @param array $params selected tag, max tag displayed, number of sizes available,
* class prefix for css class, style for selected tag
* @return string
*/
function tag_cloud($params = array()) {
global $NB_SIZE;
global $NB_MAX;
global $CLASS_PREFIX;
global $SELECTED_STYLE;
if (! is_array($params)) $params = array();
if (! isset($params['selected'])) {
$params['selected'] = '';
}
if (! isset($params['nb_max'])) {
$params['nb_max'] = $NB_MAX;
}
if (! isset($params['nb_size'])) {
$params['nb_size'] = $NB_SIZE;
}
if (! isset($params['class_prefix'])) {
$params['class_prefix'] = $CLASS_PREFIX;
}
if (! isset($params['selected_style'])) {
$params['selected_style'] = $SELECTED_STYLE;
}
$return = '';
// count tag occurrence
$res = db_query_params ('SELECT project_tags.name,project_tags.group_id
FROM project_tags, groups
WHERE project_tags.group_id = groups.group_id
AND groups.status = $1 AND groups.type_id=1 AND groups.register_time > 0',
array ('A')) ;
$tag_count = array();
while ($row = db_fetch_array($res)) {
if (forge_check_perm ('project_read', $row['group_id'])) {
$tagname = $row['name'];
if (!isset ($tag_count[$tagname])) {
$tag_count[$tagname] = 0;
}
$tag_count[$tagname]++;
}
}
// order tags by popularity
$count_to_tags = array();
foreach ($tag_count as $name => $count) {
if (!isset($count_to_tags[$count])) {
$count_to_tags[$count] = array();
}
$count_to_tags[$count][] = $name;
}
$available_counts = array_keys($count_to_tags);
rsort ($available_counts, SORT_NUMERIC);
if (count($tag_count) > 0) {
$count_min = 0;
$count_max = 0;
$nb = 0;
foreach ($available_counts as $count) {
if ($count_min == 0 || $count < $count_min) $count_min = $count;
if ($count > $count_max) $count_max = $count;
$nb = $nb + count($count_to_tags[$count]);
if ($params['nb_max'] && $nb >= $params['nb_max']) break; // no limit if nb_max == 0
}
// Compute 'A' parameter of the function
if ($count_max != $count_min) // else we have a division by zero
{
$a = ($params['nb_size'] - 1) / ($count_max - $count_min);
}
else {
// Set value 0 for 'A' parameter just for initialised variable
// but it's not realy necessary because if $count_max == $count_min
// then $count - $count_min = 0 (see below)
$a = 0;
}
ksort($tag_count, SORT_STRING);
foreach ($tag_count as $name => $count) {
if ($count < $count_min) continue;
$size = intval(1 + ($count - $count_min) * $a);
$return .= '<a href="/softwaremap/tag_cloud.php?tag='
. urlencode($name)
. '" class="' . $params['class_prefix'] . $size . '" '
. (($name == $params['selected']) ? $params['selected_style'] : '' )
. '>' . htmlspecialchars($name) . '</a> ';
}
}
return $return;
}
/**
* list_project_tag() - Returns the list of the tags defined by the project.
* Each tag is a link to display a list of projects
* where the tag is defined.
*
* @param int Group ID
* @return string
*/
function list_project_tag($group_id) {
$req = 'SELECT name FROM project_tags WHERE group_id = $1';
$res = db_query_params($req, array($group_id));
$nb_tag = db_numrows($res);
$return = '';
$idx = 1;
if ($nb_tag) {
while ($row = db_fetch_array($res)) {
$return .= '<a href="/softwaremap/tag_cloud.php?tag='
. urlencode($row['name'])
. '">' . htmlspecialchars($row['name']) . '</a>' . (($idx < $nb_tag) ? ', ' : '');
$idx++;
}
}
return $return;
}
// Local Variables:
// mode: php
// c-file-style: "bsd"
// End:
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