1 <?php

     2 

     3 /*

     4  * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between

     5  * Version 1.0.1 (Loch Ness)

     6  * Copyright (C) 2006-2007 Dan Fuhry

     7  *

     8  * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License

     9  * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

    10  *

    11  * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied

    12  * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.

    13  */

    14 

    15 /**

    16  * Class for formatting and displaying tag clouds. Loosely based the reference cloud engine from <http://www.lotsofcode.com/php/tutorials/tag-cloud>.

    17  * @package Enano

    18  * @subpackage Presentation/UI

    19  * @copyright (C) 2007 Dan Fuhry

    20  * @license GNU General Public License, version 2 or at your option any later versionc

    21  */

    22 

    23 class TagCloud

    24 {

    25   

    26   /**

    27    * The list of words in the cloud.

    28    * @var array

    29    */

    30   

    31   var $words = array();

    32   

    33   /**

    34    * Constructor.

    35    * @param array Optional. An initial list of words, just a plain old array.

    36    */

    37   

    38   function __construct($words)

    39   {

    40     if ( count($words) > 0 )

    41     {

    42       foreach ( $words as $word )

    43         $this->add_word($word);

    44     }

    45   }

    46   

    47   /**

    48    * Adds a word into the word list.

    49    * @param string The word to add

    50    */

    51   

    52   function add_word($word)

    53   {

    54     $word = strtolower($word);

    55     

    56     if ( isset($this->words[$word]) )

    57       $this->words[$word] += 1;

    58     else

    59       $this->words[$word] = 1;

    60   }

    61   

    62   /**

    63    * Returns the total size of the cloud.

    64    * @return int

    65    */

    66   

    67   function get_cloud_size()

    68   {

    69     return array_sum($this->words);

    70   }

    71   

    72   /**

    73    * Shuffles the cloud.

    74    */

    75   

    76   function shuffle_cloud()

    77   {

    78     $keys = array_keys($this->words);

    79     if ( !$keys || empty($keys) || !is_array($keys) )

    80       return null;

    81     

    82     shuffle($keys);

    83     if ( !$keys || empty($keys) || !is_array($keys) )

    84       return null;

    85     

    86     $temp = $this->words;

    87     $this->words = array();

    88     foreach ( $keys as $word )

    89     {

    90       $this->words[$word] = $temp[$word];

    91     }

    92     

    93     unset($temp);

    94   }

    95   

    96   /**

    97    * Returns the popularity index (scale class) for a 1-100 number.

    98    * @param int

    99    * @return int

   100    */

   101   

   102   function get_scale_class($val)

   103   {

   104     $ret = 0;

   105     if ( $val >= 99 )

   106       $ret = 1;

   107     else if ( $val >= 70 )

   108       $ret = 2;

   109     else if ( $val >= 60 )

   110       $ret = 3;

   111     else if ( $val >= 50 )

   112       $ret = 4;

   113     else if ( $val >= 40 )

   114       $ret = 5;

   115     else if ( $val >= 30 )

   116       $ret = 6;

   117     else if ( $val >= 20 )

   118       $ret = 7;

   119     else if ( $val >= 10 )

   120       $ret = 8;

   121     else if ( $val >= 5 )

   122       $ret = 9;

   123     return $ret;

   124   }

   125   

   126   /**

   127    * Generates and returns HTML for the cloud.

   128    * @return string

   129    */

   130    

   131   function make_html()

   132   {

   133     $html = array();

   134     $max  = max($this->words);

   135     $size = $this->get_cloud_size();

   136     if ( count($this->words) > 0 )

   137     {

   138       foreach ( $this->words as $word => $popularity )

   139       {

   140         $word = htmlspecialchars($word);

   141         $percent = ( $popularity / $max ) * 100;

   142         $index = $this->get_scale_class($percent);

   143         $html[] = "<span class='tc_word tc_index_$index'>$word</span>";

   144       }

   145     }

   146     $html = implode("\n", $html);

   147     return $html;

   148   }

   149    

   150   

   151 }

   152 

   153 ?>