From 824eac0454ad341f6b285c9159c69317772986ca Mon Sep 17 00:00:00 2001
From: Andreas Gohr <gohr@cosmocode.de>
Date: Mon, 11 Sep 2006 14:01:15 +0200
Subject: [PATCH] weighted tagcloud

darcs-hash:20060911120115-6e07b-de95c8d8d3abb9e2334ee4971aab4c26b94ab4f1.gz
---
 README              |  4 ++--
 VERSION             |  2 +-
 tags.php            | 33 ++++++++++++++++++++++++++++-----
 templates/style.css | 30 ++++++++----------------------
 4 files changed, 39 insertions(+), 30 deletions(-)

diff --git a/README b/README
index 4d3cee7..d37c796 100644
--- a/README
+++ b/README
@@ -11,8 +11,8 @@ You need to have a running LDAP Server with some users (objectClass=posixUser)
 in it. It is important that you already have these users because LDAPab uses
 them to authenticate.
 
-You need a webserver (peferable Apache) with PHP4. PHP4 needs to be compiled
-with LDAP support (compiled in or as extension)
+You need a webserver (peferable Apache) with PHP (4.3 or higher). PHP needs to
+be compiled with LDAP support (compiled in or as extension)
 
 === SETUP LDAPab ===
 
diff --git a/VERSION b/VERSION
index be58634..bd73f47 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.3
+0.4
diff --git a/tags.php b/tags.php
index bd26632..443ed67 100644
--- a/tags.php
+++ b/tags.php
@@ -13,10 +13,11 @@
     global $conf;
     global $LDAP_CON;
     if(!$conf['extended']) return;
-    
+
     $result = ldap_queryabooks('(objectClass=contactPerson)','marker');
 
     $max = 0;
+    $min = 999999999;
     $tags = array();
     foreach ($result as $entry){
       if(!empty($entry['marker']) && count($entry['marker'])){
@@ -25,20 +26,42 @@
           if (empty($tags[$marker])) { $tags[$marker]=0; }
           $tags[$marker] += 1;
           if($tags[$marker] > $max) $max = $tags[$marker];
+          if($tags[$marker] < $min) $min = $tags[$marker];
         }
       }
     }
     ksort($tags);
+    tag_cloud_weight(&$tags,$min,$max,6);
 
     $out = '';
     foreach($tags as $tag => $cnt){
-      $pct = round($cnt * 20 / $max); // percents from 0 to 20
-
-      $out .= '<a href="index.php?marker='.rawurlencode($tag).'" class="tc'.$pct.'">';
+      $out .= '<a href="index.php?marker='.rawurlencode($tag).'" class="cloud_'.$cnt.'">';
       $out .= htmlspecialchars($tag).'</a> ';
     }
 
     return $out;
   }
 
-?>
+  /**
+   * Calculate weights for a nicer tagcloud distribution
+   */
+  function tag_cloud_weight(&$tags,$min,$max,$levels){
+    // calculate tresholds
+    $tresholds = array();
+    for($i=0; $i<=$levels; $i++){
+        $tresholds[$i] = pow($max - $min + 1, $i/$levels);
+    }
+
+    // assign weights
+    foreach($tags as $tag => $cnt){
+        foreach($tresholds as $tresh => $val){
+            if($cnt <= $val){
+                $tags[$tag] = $tresh;
+                break;
+            }
+            $tags[$tag] = $levels;
+        }
+    }
+  }
+
+
diff --git a/templates/style.css b/templates/style.css
index b0f4a58..6034799 100644
--- a/templates/style.css
+++ b/templates/style.css
@@ -54,7 +54,7 @@ td    {background-color:#66CCFF:margin:3px}
               margin:2px;
               font-family:Lucida,Helvetica,Verdana,Arial,Sans-Serif;
               font-size: 12px;}
-               
+
 .photo {
   margin-top: 1em;
   border-width:1px;
@@ -140,27 +140,13 @@ h1 img {
 }
 
 /* TagCloud */
-a.tc0  { font-size: 80%; }
-a.tc1  { font-size: 100%; }
-a.tc2  { font-size: 120%; }
-a.tc3  { font-size: 130%; }
-a.tc4  { font-size: 140%; }
-a.tc5  { font-size: 150%; }
-a.tc6  { font-size: 160%; }
-a.tc7  { font-size: 170%; }
-a.tc8  { font-size: 180%; }
-a.tc9  { font-size: 190%; }
-a.tc10 { font-size: 200%; }
-a.tc11 { font-size: 210%; }
-a.tc12 { font-size: 220%; }
-a.tc13 { font-size: 230%; }
-a.tc14 { font-size: 240%; }
-a.tc15 { font-size: 250%; }
-a.tc16 { font-size: 260%; }
-a.tc17 { font-size: 270%; }
-a.tc18 { font-size: 280%; }
-a.tc19 { font-size: 290%; }
-a.tc20 { font-size: 300%; }
+a.cloud_0 {font-size: 90%; }
+a.cloud_1 {font-size: 110%; }
+a.cloud_2 {font-size: 140%; }
+a.cloud_3 {font-size: 150%; }
+a.cloud_4 {font-size: 160%; }
+a.cloud_5 {font-size: 180%; }
+a.cloud_6 {font-size: 200%; }
 
 a.tag {
   background: url(../pix/tag_blue.png) left center no-repeat;
-- 
2.39.5