🚀 go-pugleaf

The first thing you should try for mirror imaging is probably to see
if the printer has a "mirror" button.  It's a common option on color
printers and typesetters (on the latter, the orientations are called
Right-Reading Emulsion-Down, or RRED, and Right-Reading Emulsion-Up,
RREU).

In article <b#dg8qa@rpi.edu>, rodney@sun.ipl.rpi.edu (Rodney Peck II) writes:
|> 8.5 72 mul 0 translate
|> -1 1 scale
|> 
|>  . . .
|> 
|> If you use some strange page size, you should use it's
|> width in points instead of 8.5 72 mul.

Alert of Rodney to mention that it's size specific.  It seems that
lots of people are taught to code the page size into their documents,
but it's not necessary, and often can lead to problems when you print
on more than one type of printer.  The PostScript interpreter can
ALWAYS tell your program the size of the page.  Add the following
procedure to your bag of tricks:

/printable-area { % - => llx lly urx ury
   gsave clippath pathbbox grestore
} bind def

leaves the dimensions of the current clip area, in current user
coordinates, on the top of the stack.  (This probably qualifies for
the FAQ list.)  If it's done before anyone has done any clipping, the
current clip area = the imageable area.  (If your document has been
included in another one, the including document should have set your
clip area for you, so it's probably better that you *not* do an
initclip, though an alert program designer will overshadow initclip
when including documents, for just this reason.)

To mirror image the document, try

printable-area   % stack: llx lly urx ury
0 exch                  % llx lly urx 0 ury
translate               % llx lly urx 
pop pop pop             % -
-1 1 scale

-- Rich