require 'rubygems'require 'sparklines'require 'base64'def embedded_sparkline  %{<img src="data:image/png;base64,#{Base64.encode64(yield)}">}end# This method scales data so that the smallest item becomes 0 and the# largest becomes 100.def scale(data)  min, max = data.min, data.max  data.collect { |x| (x - min) / (max - min) * 100}end# Randomly generate closing prices for the past month.prices = [rand(10)]30.times { prices << prices.last + (rand - 0.5) }# Generate HTML containing a stock graph as an embedded sparkline.sparkline = embedded_sparkline { Sparklines.plot(scale(prices)) }open('stock.html', 'w') do |f|  f << "Is EvilCorp (NASDAQ:EVIL #{sparkline}) poised for a comeback?"end#---agree_percentages = [ 55, 71, 44, 55, 81, 68 ]speech = %{This country faces a crisis and a crossroads. %s Our taxesare too high %s and our poodles are too well-groomed. %s Our childrenlearn less in school %s and listen to louder music at home. %s TheInternet scares me. %s}open('speech.html', 'w') do |f|  sparklines = agree_percentages.collect do |p|     embedded_sparkline do      Sparklines.plot([p], :type => 'pie', :remain_color => 'pink',                           :share_color=>'blue',                           :background_color=>'transparent')    end  end  f << speech % sparklinesend#---$ ./script/generate sparklines      create  app/controllers/sparklines_controller.rb      create  app/helpers/sparklines_helper.rb#---This country faces a crisis and a crossroads. <%= sparkline_tag [55, 10, 10, 20, 30], :type => "pie", :remain_color=>"pink",:share_color => "blue", :background_color => "transparent" %>#---This country faces a crisis and a crossroads. <img src="/sparklines?share_color=blue&remain_color=pink&results=55&type=pie&background_color=transparent"class="sparkline" alt="Sparkline Graph" />#---