Tagcloud.module

<?php

class Tagcloud extends WireData implements Module {
    public static $defaultOptions = array (
        'minSize' => 0.8,
        'maxSize' => 1.8,
        'unit' => 'em',
    );

    public static function getModuleInfo () {
        return array(
            'title' => 'Tagcloud',
            'version' => 001,
            'summary' => 'Renders a tagcloud',
            'singular' => false,
            'autoload' => false
        );
    }

    public function init () {
        /* Maybe we could cache the tag cloud between page edits
         * Need to look at hooks for that.
        */
    }

    public function render(Array $options = null, $tagroot = "/tags") {

        if ($options != null && is_array($options)) {
            $options = array_merge(self::$defaultOptions, $options);
        } else {
            $options = self::$defaultOptions;
        }
        $diffFontSize = $options['maxSize'] - $options['minSize'];

        $tags = $this->pages->get($tagroot)->children;

        $items = array();
        $min = 1e9;
        $max = -1e9;

        foreach ($tags as $tag) {
            $count = $this->pages->count('tags=' . $tag);

            $min = min ($min, $count);
            $max = max ($max, $count);

            $items[$tag->title] = array("count" => $count, "url" => $tag->url);
        }

        $diff = log($max) - log($min);

        foreach ($items as $tag => $values) {
            $count = $values["count"];
            $url = $values["url"];
            $relative = (log($count) - log($min)) / $diff;
            $size = $options['minSize'] + $relative * $diffFontSize;

            echo "<a class=\"tag\" href=\"{$url}\" style=\"font-size: {$size}{$options['unit']}\">{$tag}</a> ";
        }
    }
}
?>