barchart.rb

def create_bar_chart(opts, data)  
  g = Gruff::Bar.new(opts[:size])  
  g.title = opts[:title]  
  g.minimum_value = opts[:minimum]  
  g.maximum_value = opts[:maximum]  
  g.labels = data.map { |e| e.category }  
  g.data(opts[:legend], data.map { |e| e.count } )  
  g.x_axis_label = opts[:x_axis_label]  
  g.y_axis_label = opts[:y_axis_label]  
  return g.to_blob  
end