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require File.dirname(__FILE__) + '/base'
##
# A special bar graph that shows a single dataset as a set of
# stacked bars. The bottom bar shows the running total and
# the top bar shows the new value being added to the array.
class Gruff::AccumulatorBar < Gruff::StackedBar
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
end
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