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me too. I wanted it for the EAN13 barcode generator

then I would need to redo the barcode generator...

No. But for e.g. PDF format allows you to have a 2D "barcode", which 
can hold cca 64KB of data, or so I remember ....

easy to read description at www.grandzebu.net together with other 
barcode symbologies

I've seen a problem with a barcode reader that could not read codes 
printed from one expensive printer and it would read them fine if 
printed from another cheap printer

I didn't discover the error until I tried it on the expensive printer. 
besides the size and position of the line was supposed to be correct. 
the barcode was created with PDF Maker

louis, check out http://www.hmkdesign.dk/rebol/barcode/

There are no docs, but I hope the demos are a bit explanatory

I'm building EAN13 barcode support for PS now. not very hard

now I'm imagining: this is really lowlevel stuff, but I think it 
would be neat to build standardized higher level primitives. a barcode 
is such a primitive. barcharts, 3D views and complex symbols could 
be other types of primitives. just brainstorming...

that barcode thing.

you can't use a postscript barcode font?

no, the barcode is already working fine. it's the position of the 
image on the paper and general arrangement of the code that needs 
to be worked out

postscript [page [at 20x20 barcode 12345]]

there we go... http://www.hmkdesign.dk/barcode.ps

works fine with barcode readers. have tested with both cheap and 
expensive ones. just need a good printer

where's the barcode function?

http://www.hmkdesign.dk/rebol/barcode/ean13.r

Luckily I have no need for a barcode at present.

the string is necessary, but I should probably put the create function 
inside the barcode generator function

you can take any 12 digit string, but the 13th digit is a checksum 
which must be correct or the barcode can't be read

You can create the barcode in John's as an eps image, and insert 
it into the postscript.

I presume you don't really need to preview the barcode.

so, as the author says, you can include a barcode as simply as

50 450 moveto (1-86074-271) (includetext) isbn barcode

how is barcode part done?

pekr, sorry, this is a better link: http://www.hmkdesign.dk/rebol/barcode/

are you drawing your barcode and translating it to final location?

graham, the barcode is drawn as an image and then pasted into the 
preview