# File lib/pdf/writer/graphics.rb, line 762
762:   def rotate_axis(angle)
763:     rad = PDF::Math.deg2rad(angle)
764:     tt  = "\n%.3f %.3f %.3f %.3f 0 0 cm"
765:     tx  = [ Math.cos(rad), Math.sin(rad), -Math.sin(rad), Math.cos(rad) ]
766:     add_content(tt % tx)
767:     self
768:   end