🚀 go-pugleaf

I have recently begun inserting more EPS files in to my troff documents
and was always quite frustrated as to where the "image" would
show up on the page. In particular I refer to idraw that appears
to set the coordinates at the lower-left of an 8.5X11 sheet so
that when the origin was translated to the present troff position
the image would be offset by its location in the idraw image.
Is this usual for EPS?

This macro takes the bounding box information and calculates
the proper space and offset for the image to be centered on
the page. Any suggestions/improvements?

--R J Auletta
  rauletta@gmuvax2.gmu.edu

.\" This macro centers an EPS file based on the bounding box information.
.\" Usage: .BB file Bounding_Box  Example: .BB test.eps 143 413 469 613
.\" Assumes the usage of Elan's macro package.
.\"
.de BB
.cS \\$1 \\$4p-\\$2p \\$5p-\\$3p ((\n(.l-(\\$4p-\\$2p)/2)-\\$2p)u \\$3p
..