Set the vertical position of the watermark. The default values are va_center and 0. The distance is measured from the top edge of the page to the top edge of the watermark (va_top), from the center of the page to the center of the watermark (va_center), or from the bottom edge of the page to the bottom edge of the watermark. For va_bottom and va_center, positive values push the watermark up, for va_top, positive values push the watermark down.

public void setVerticalPosition(
	VerticalAlignment alignment,
	double distance
)