# File lib/gruff/accumulator_bar.rb, line 9 def draw raise(Gruff::IncorrectNumberOfDatasetsException) unless @data.length == 1 accum_array = @data.first[DATA_VALUES_INDEX][0..-2].inject([0]) { |a, v| a << a.last + v} data 'Accumulator', accum_array set_colors @data.reverse! super end