# File lib/prawn/graph.rb, line 44 def bar_chart(data, options = {}) if data.nil? || data.empty? raise Prawn::Errors::NoGraphData, "data must be a non-empty, non-nil, two dimensional array " + "in the form [ [ 'Title', SomeValue ] ]" end Prawn::Chart::Bar.new(data, self, options).draw end