prawn：Prawn::Document.new

everyday Ruby 
#!/usr/bin/env ruby

require "prawn"

pdf = Prawn::Document.new

pdf.font "Times-Roman"
pdf.text "Hello World", :at => [200,720], :size => 32

pdf.render_file(File.basename($0, ".rb") + ".pdf")

#!/usr/bin/env ruby

require "prawn"

pdf = Prawn::Document.new(:page_size => "A4", :page_layout => :landscape)

pdf.font "Times-Roman"
pdf.text "Hello World", :at => [320,200], :size => 32

pdf.render_file(File.basename($0, ".rb") + ".pdf")

#!/usr/bin/env ruby

require "prawn"

pdf = Prawn::Document.new(:background => "#{Prawn::BASEDIR}/data/images/pigs.jpg")

pdf.render_file(File.basename($0, ".rb") + ".pdf")