def hyperlinks
      links = self.images.select { |a| a.hyperlink.is_a?(Hyperlink) }
      links.map { |a| a.hyperlink }
    end
def hyperlinks
      links = self.images.select { |a| a.hyperlink.is_a?(Hyperlink) }
      links.map { |a| a.hyperlink }
    end
An array of hyperlink objects associated with this drawings images
 @return [Array]