setThumbnailDimensions example

$this->authorUrl = $author_url;

    if (isset($cache_age) && is_numeric($cache_age)) {
      // If the cache age is too big, it can overflow the 'expire' column of       // database cache backends, causing SQL exceptions. To prevent that,       // arbitrarily limit the cache age to 5 years. That should be enough.       $this->cacheMaxAge = Cache::mergeMaxAges((int) $cache_age, 157680000);
    }

    if ($thumbnail_url) {
      $this->thumbnailUrl = $thumbnail_url;
      $this->setThumbnailDimensions($thumbnail_width, $thumbnail_height);
    }
  }

  /** * Creates a link resource. * * @param string $url * (optional) The URL of the resource. * @param \Drupal\media\OEmbed\Provider $provider * (optional) The resource provider. * @param string $title * (optional) A text title, describing the resource. * @param string $author_name * (optional) The name of the author/owner of the resource. * @param string $author_url * (optional) A URL for the author/owner of the resource. * @param int $cache_age * (optional) The suggested cache lifetime for this resource, in seconds. * @param string $thumbnail_url * (optional) A URL to a thumbnail image representing the resource. If this * parameter is present, $thumbnail_width and $thumbnail_height must also be * present. * @param int $thumbnail_width * (optional) The width of the thumbnail, in pixels. If this parameter is * present, $thumbnail_url and $thumbnail_height must also be present. * @param int $thumbnail_height * (optional) The height of the thumbnail, in pixels. If this parameter is * present, $thumbnail_url and $thumbnail_width must also be present. * * @return static */