Rotation example with prawn

rotate_prawn.rb

require 'rubygems'
require 'prawn'

$pdf = Prawn::Document.new(:page_size => 'A4')
$pdf.line_width = 0.3

def test_box(origin, angle)
  $pdf.translate(*origin) do
    $pdf.rotate(angle, :origin => [0, 0]) do
      $pdf.stroke do
        $pdf.rectangle([0, 0], 200, 40)
        $pdf.horizontal_line(0, 200, :at => -20)
        $pdf.vertical_line(0, -40, :at => 100)
        $pdf.text_box('Romulo', :size => 20, :at => [0, 0], :width => 200, :height => 40,
            :align => :center, :valign => :center)
      end
    end
  end
end

test_box([0, 600], 45)
test_box([0, 600], 0)
test_box([250, 600], 90)
test_box([0, 500], 0)
test_box([250, 500], -45)

$pdf.render_file('a.pdf')
`cmd.exe /c start a.pdf`