# File temp/Graph/Line.rb, line 110
      def max_value
        max = 0
        
        if (stacked == true) then
          sums = Array.new(@config[:fields].length).fill(0)

          @data.each do |data|
            sums.each_index do |i|
              sums[i] += data[:data][i].to_f
            end
          end
          
          max = sums.max
        else
          max = @data.collect{|x| x[:data].max}.max
        end

        return max
      end