Playing around with prawn for pdf-generation. See docs at http://rdoc.info/github/sandal/prawn/ and manual at http://prawn.majesticseacreature.com/manual.pdf

Gemfile

source 'https://rubygems.org'

gem 'prawn'

gem 'rb-fsevent', '~> 0.9'
gem 'guard'
gem 'guard-shell'

Guardfile

guard :shell do
  watch(/(.*).rb/) do |m|
    `ruby #{m[0]} && open #{m[1]}.pdf`
  end
end

test.rb

require "prawn"
require "prawn/measurement_extensions"

Prawn::Document.generate("test.pdf", page_size: "A4") do
  text "Hello world", align: :center, size: 17.mm
  move_down 1.5.cm

  # image open("logo.png"), width: 80.mm, position: :center

  stroke_bounds

  font("Courier", :size => 10) do
    text "Yeah, using Courier 10 courtesy of the font method."
  end

  table([ ["Ruby", "Great"], ["Java", "Not so much"] ])

  bounding_box [100,500], width: 200, height: 100 do
    stroke_bounds
    text "happy days "*10
  end

  stroke_color "FF0000"
  fill_color "00ff00"
  self.line_width = 10
  stroke do
    move_to 0, 0
    line_to 100, 100
    line_to 0, 100
    curve_to [150, 250], :bounds => [[20, 200], [120, 200]]
    curve_to [200, 0], :bounds => [[150, 200], [450, 10]]
  end

  fill_ellipse [200, 100], 100, 50

  start_new_page

  text "On the new page", align: :center, size: 8.mm
end