Starts a new page.
pdf_document
The document handle, returned by cpdf_open().
page_number
The page number
orientation
0 for portrait and 1 for landscape
height
The page height
width
The page width
unit
The unit for the coordinate system. The value should be the number of postscript points per unit. Since one inch is equal to 72 points, a value of 72 would set the unit to one inch. The default is also 72.