def extract_drawing_filepath
      # Read drawing relationship ID from the sheet.
      sheet_filepath = "xl/#{@sheetfile}"
      drawing = parse_xml(sheet_filepath).css('drawing').first
      return if drawing.nil?

      drawing_rid = drawing.attributes['id'].value

      # Read sheet rels to find drawing file's location.
      sheet_rels_filepath = expand_to_rels_path(sheet_filepath)
      parse_xml(sheet_rels_filepath).css("Relationship[@Id='#{drawing_rid}']").first.attributes['Target'].value
    end
def extract_drawing_filepath
      # Read drawing relationship ID from the sheet.
      sheet_filepath = "xl/#{@sheetfile}"
      drawing = parse_xml(sheet_filepath).css('drawing').first
      return if drawing.nil?

      drawing_rid = drawing.attributes['id'].value

      # Read sheet rels to find drawing file's location.
      sheet_rels_filepath = expand_to_rels_path(sheet_filepath)
      parse_xml(sheet_rels_filepath).css("Relationship[@Id='#{drawing_rid}']").first.attributes['Target'].value
    end
Find drawing filepath for the current sheet.
 Sheet xml contains drawing relationship ID.
 Sheet relationships xml contains drawing file's location.