Add CSS classes to theme function

I’m implementing hook_theme() in a custom module.

function monitor_chart_theme() {   return array(     'chart_monitor' => array(       'template' => 'monitor_chart',       'variables' => array(         'container' => null,         'theme' => null,         'classes' => null,         'chart' => null,       ),     ),   ); } 

On the template file, I would like to add additional CSS classes the theme function gets in its parameters. I declared a preprocess function with the following code.

function monitor_chart_preprocess_chart_monitor(&$vars) {   if ($vars['classes']) {     foreach ($vars['classes'] as $class) {       $vars['classes_array'][] = $class;     }   } } 

The template file contains the following code.

<div id="<?php print $container; ?>" class="<?php print $classes; ?>"></div> 

If I don’t use the preprocess function, the class attribute of <div> contains just 'chart-monitor', the name of the theme function.

Is there a more elegant way to pass extra variables to a template file?

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