# File temp/Graph/Pie.rb, line 171
      def keys
        total = 0
        max_value = 0
        @data.each {|x| total += x }
        percent_scale = 100.0 / total
        count = -1
        a = @config[:fields].collect{ |x|
          count += 1
          v = @data[count]
          perc = show_key_percent ? " "+(v * percent_scale).round.to_s+"%" : ""
          x + " [" + v.to_s + "]" + perc
        }
      end