function admin_enqueue_assets() {
    $base_url = plugins_url( '', __FILE__ );
    wp_enqueue_style( $this->prefix, $base_url . '/pointerplus.css', array( 'wp-pointer' ) );
    wp_enqueue_script( $this->prefix, $base_url . '/pointerplus.js?var=' . str_replace( '-', '_', $this->prefix ) . '_pointerplus', array( 'wp-pointer' ) );
    wp_localize_script( $this->prefix, str_replace( '-', '_', $this->prefix ) . '_pointerplus', apply_filters( $this->prefix . '_pointerplus_js_vars', $this->pointers ) );
  }