WordPress Top Rated Posts Template

I’m using a ‘top rated posts’ plugin [‘Post Ratings’ by Digitalnature] for my wordpress installation, which allows users to vote on posts using a 5 star rating system.

The plugin then allows you to pull the top rated posts in to your template files so that you can create a page listing the ‘Top 20’ for example.

The readme file that comes with the plugin has the following example code:

= How do I manually get the most rated posts using PHP? =

      <code>$posts = PostRatings()->getTopRated($arguments);</code>

    Possible arguments, and their defaults:

        'post_type' => 'post',
        'number'       => 10,                   // max. number of posts to retrieve
        'offset'       => 0,                    // offset from where to start
        'sortby'       => 'bayesian_rating',    // bayesian_rating, rating or votes
        'order'        => 'DESC',               // ASC or DESC
        'date_limit'   => 0,                    // date limit in days

    Return value is an array of post objects containing the usual post properties + 3 extra properties:

        $post->votes                            // number of votes
        $post->rating                           // average rating
        $post->bayesian_rating                  // weighted rating

    Example usage:

        global $post;
        $results = PostRatings()->getTopRated();

        foreach($results as $post){
          setup_postdata($post); ?>

          // here is the usual loop
          <?php the_title(); ?> - <?php printf(_n('%d vote', '%d votes', $post->votes), $post->votes); ?>

          <?php
        }

        // restore original post
        wp_reset_postdata();

My standard Page template file that i’m trying to integrate this with is as follows:

/*---------------------------------
    	Template Name: Top Rated Mixtapes
    ------------------------------------*/

    	get_header();
    	$k1 = 0;
    	$k2 = 0;

    ?>
    		<section id="portfolio" class="folioGrid clearfix">
    			<?php while (have_posts()) : the_post(); 

    				$paged = get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1;

    				$args = array( 'posts_per_page' => 20,
    					   'offset'=> 0,
    					   'post_type' => 'portfolio');

    				$all_posts = new WP_Query($args);

    				while($all_posts->have_posts()) : $all_posts->the_post();

    				$portfolio_terms = wp_get_object_terms($post->ID, 'portfolio_category');
    				$portfolio_class = "folioItem " . $portfolio_terms[0]->slug;
    				$portfolio_sort = $portfolio_terms[0]->slug . '[1][0]';
    				$portfolio_type = $portfolio_terms[0]->slug;

    			?>

    			<a>" class="<?php echo $portfolio_class; ?>" data-sort="<?php echo $portfolio_sort; ?>" data-type="<?php echo $portfolio_type; ?>" href="<?php the_permalink(); ?>" data-name="<?php echo $post->post_name; ?>" data-external="<?php echo get_post_meta($post->ID, 'rb_post_url_d', true) != '' ? get_post_meta($post->ID, 'rb_post_url_d', true) : 'no'; ?>">

    				<?php the_post_thumbnail('portfolio-thumb', array('class' => 'folioThumb'));?>

    				<div class="folioTextHolder">
    					<div class="folioText">
    						<h3><?php the_title(); ?></h3>
    						<p><?php rb_excerpt('rb_excerptlength_folio', 'rb_excerptmore'); ?></p>
    					</div>
    				</div>

    			</a>
    			<?php endwhile; ?>
    		<?php endwhile; ?>

What i can’t seem to understand is how to implement it.
Any advice appreciated.