[barcode] rotating a barcode -- thanks

[s.blood]

Wow. You guys are fast. Thanks. 

The easiest solution to my problem was Alessandro's which worked
effortlessly. 

Thanks,
steve

ps- I was serious about sending some Copyleft stuff. Or, if you wanted to,
you could create a cool bar code shirt and I could add it to the lineup
and send you some. 







On Thu, 14 Nov 2002, Alessandro Rubini wrote:

> 
> Hi.
> 
> > Just check out the site and drop me an email --
> > and, yes, I'll happily ship to Italy).
> 
> Thanks :)
> 
> > At any rate, one small thing I'd like to be able to do is rotate a barcode
> > 90 degrees. [...]
> 
> Since you include the generated postscript in a bigger document, I think
> the best solution is to use postscript's management of device space.
> 
> If you want the bottom-left corner of the barcode (i.e., bottom-right
> of the drawing as seen on the page) to be at pos XPOS,YPOS, you can
> print the barcode at offset 0,0 and the do this stuff:
> 
> 	gsave
> 	  XPOS YPOS translate
> 	  90 rotate
> 	  <postscript generated by GNU barcode>
> 	grestore
> 
> This uses the "graphic state" stack, saving and then restoring the
> previous transformation matrix and changing the current transformation
> before including the barcode. Note that this approach is safe with any
> other trasnformation that you may want to apply (like mpage, psnup or
> anything else).
> 
> > After looking at the postscript output, I tried doing a regular expression
> > which swapped the x and y coordinates. So, this:
> > [...]
> > That seemed like a reasonable approach and the result was a barcode, but
> > the bars get munged somehow and are not decodable.
> 
> I think the problem here is the one outlined by Christoph Pross.
> 
> Please tell me if you have problems with the approach outlined above.
> 
> BTW: if you want to see translate and rotate in action in some _simple_
> postscript, you might want to look at my business cards, written with vi.
> ftp://ar.linux.it/pub/misc/bigghietti.ps.gz
> 
> Hope this helps
> 
> /alessandro, who knows the best drawing program is metapost, after vi.
> -- 
> Alessandro Rubini, free software developer.
> Device drivers, embedded systems, courses.
> http://ar.linux.it/
>