The transform as a System.Drawing.Drawing2D Matrix.
This matrix type holds element values as single precision
floating point values so it is is less accurate than the underlying
Windows coordinates are measured in distances from the top left
of the drawing surface while PDF coordinates are measured from the
Remember that transforms operate on the underlying PDF
coordinates rather than on any Windows coordinates. So by
specifying a rotation around the origin you are specifying a
rotation anchored at the bottom left of the document page.