Hey guys, It’s a quickly post about how to generate pdf with prawn and google charts. Prawn is a awesome lib in ruby for generating PDF documents and google charts is a API to generate charts. I like to create a class responsible to generate my pdf documents. Here is my implementation:

# encoding: UTF-8
require 'open-uri'
class GenderReportPdf < Prawn::Document
  
  def initialize(mens, womans)
    super(top_margin: 70)
    add_title
    @mens = mens
    @womans = womans
    add_count
    add_image
  end
  
  def add_title
    text "Report by Gender", size: 28, style: :bold, position: :center
  end
  
  def add_count
    move_down 20
    text "Mens #{@h_count}"
    text "Womans #{@m_count}"
  end
  
  def add_image
    move_down 20
    image get_external_image, :position => :center
  end
  
  def get_external_image
    img = URI.parse(URI.encode("https://chart.googleapis.com/chart?cht=p3&chd=t:#{@mens},#{@womans}&chs=250x100&chl=Mens|Womans")).to_s
    img = open(img)
  end
  
end