includes/tagcloud.php
author Dan
Sun, 05 Aug 2007 15:58:50 -0400
changeset 81 d7fc25acd3f3
parent 80 cb7dde69c301
child 83 80facec76d9f
permissions -rw-r--r--
Replaced the menu in the admin theme with something much more visually pleasureable; minor fix in Special:UploadFile; finished patching a couple of XSS problems from Banshee; finished Admin:PageGroups; removed unneeded code in flyin.js; finished tag system (except tag cloud); 1.0.1 release candidate
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<?php
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/*
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 * Enano - an open-source CMS capable of wiki functions, Drupal-like sidebar blocks, and everything in between
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 * Version 1.0.1 (Loch Ness)
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 * Copyright (C) 2006-2007 Dan Fuhry
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 *
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 * This program is Free Software; you can redistribute and/or modify it under the terms of the GNU General Public License
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 * as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied
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 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for details.
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 */
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/**
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 * Class for formatting and displaying tag clouds. Loosely based the reference cloud engine from <http://www.lotsofcode.com/php/tutorials/tag-cloud>.
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 * @package Enano
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 * @subpackage Presentation/UI
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 * @copyright (C) 2007 Dan Fuhry
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 * @license GNU General Public License, version 2 or at your option any later versionc
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 */
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class TagCloud
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{
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  /**
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   * The list of words in the cloud.
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   * @var array
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   */
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  var $words = array();
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  /**
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   * Constructor.
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   * @param array Optional. An initial list of words, just a plain old array.
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   */
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  function __construct($words)
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  {
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    if ( count($words) > 0 )
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    {
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      foreach ( $words as $word )
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        $this->add_word($word);
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    }
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  }
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  /**
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   * Adds a word into the word list.
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   * @param string The word to add
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   */
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  function add_word($word)
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  {
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    $word = strtolower($word);
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    if ( isset($this->words[$word]) )
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      $this->words[$word] += 1;
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    else
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      $this->words[$word] = 1;
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  }
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  /**
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   * Returns the total size of the cloud.
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   * @return int
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   */
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  function get_cloud_size()
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  {
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    return array_sum($this->words);
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  }
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  /**
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   * Shuffles the cloud.
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   */
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  function shuffle_cloud()
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  {
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    $keys = array_keys($this->words);
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    if ( !$keys || empty($keys) || !is_array($keys) )
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      return null;
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    shuffle($keys);
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    if ( !$keys || empty($keys) || !is_array($keys) )
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      return null;
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    $temp = $this->words;
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    $this->words = array();
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    foreach ( $keys as $word )
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    {
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      $this->words[$word] = $temp[$word];
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    }
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    unset($temp);
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  }
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  /**
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   * Returns the popularity index (scale class) for a 1-100 number.
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   * @param int
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   * @return int
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   */
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  function get_scale_class($val)
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  {
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    $ret = 0;
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    if ( $val >= 99 )
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      $ret = 1;
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    else if ( $val >= 70 )
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      $ret = 2;
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    else if ( $val >= 60 )
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      $ret = 3;
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    else if ( $val >= 50 )
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      $ret = 4;
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    else if ( $val >= 40 )
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      $ret = 5;
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    else if ( $val >= 30 )
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      $ret = 6;
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    else if ( $val >= 20 )
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      $ret = 7;
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    else if ( $val >= 10 )
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      $ret = 8;
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    else if ( $val >= 5 )
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      $ret = 9;
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    return $ret;
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  }
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   125
  
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  /**
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   * Generates and returns HTML for the cloud.
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   * @return string
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   */
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  function make_html()
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  {
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    $html = array();
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    $max  = max($this->words);
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    $size = $this->get_cloud_size();
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    if ( count($this->words) > 0 )
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    {
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      foreach ( $this->words as $word => $popularity )
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      {
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        $word = htmlspecialchars($word);
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        $percent = ( $popularity / $max ) * 100;
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        $index = $this->get_scale_class($percent);
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        $html[] = "<span class='tc_word tc_index_$index'>$word</span>";
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      }
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    }
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    $html = implode("\n", $html);
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    return $html;
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  }
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}
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?>