rotate
Get/set the page rotation.
[read/write property]
rotate([out, retval] int *rotate)
rotate([in] int rotate)
This property contains the current rotation angle. The angle is in
degrees and can be 0 (the default), 90, 180, or 270. Normally, a PDF
file specifies the correct rotation for each page (e.g., 90 degrees
for landscape pages) - XpdfViewer handles this automatically, and it's
not necessary to change the rotate property. The rotate property is
primarily useful with misconfigured PDF files that don't have the
correct page rotation set.
VB:
viewer.rotate = 90