Class Gruff::AccumulatorBar
In: lib/gruff/accumulator_bar.rb
Parent: Gruff::StackedBar

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.

Methods

draw  

Public Instance methods

[Source]

# File lib/gruff/accumulator_bar.rb, line 10
  def draw
    raise(Gruff::IncorrectNumberOfDatasetsException) unless @data.length == 1
    
    accumulator_array = []
    index = 0

    increment_array = @data.first[DATA_VALUES_INDEX].inject([]) {|memo, value| 
        memo << ((index > 0) ? (value + memo.max) : value)
        accumulator_array << memo[index] - value
        index += 1
        memo
      }
    data "Accumulator", accumulator_array
    
    super
  end

[Validate]