pdfPrintSetOffset

Set the offset from the lower-left corner of the paper.
void pdfPrintSetOffset(PDFHandle pdf, double xOffset, double yOffset)
This function sets the offset from the lower-left corner of the paper. The distances (xOffset and yOffset) are in points.

pdfPrintResetParams resets this to its default value, which is zero offset.

C:
pdfPrintSetOffset(pdf, 18, 18);
pdfPrintResetParams