[R] problem clipping R postscript plots within latex

[Peter Dalgaard BSA]

Stephen Eglen <stephen at cogsci.ed.ac.uk> writes:

>  > > generated by R into a latex document.  Specifically, the latex package
>  > > graphicsx allow you to specify the bounding box of the postscript
>  > > file, so that you can just show _part_ of the postscript file if you
>  > > tell it to also clip the area outside of the bounding box.
> ...
>  > Ow. This stems from the use of "initclip" in the R-generated PS. One
>  > shouldn't do that, one should bracket clipped graphics within
>  > gsave/grestore instead. Sounds a bit tricky to get right.
> 
> Thanks.  To solve my current problem, I changed the definition of the
> `cl' operator in the postscript file to:
> 
> /cl  { gsave initclip newpath 3 index 3 index moveto 1 index
>        4 -1 roll lineto  exch 1 index lineto lineto
>        closepath clip grestore newpath } def
> 
> [i.e. just adding the gsave ... grestore pair]
> 
> Whether this is the proper solution though is another matter...

It isn't. It grestore-s before actually plotting the stuff that needs
to be clipped, so effectively you just disabled R's clipping. A better
way would be to start the plotting with a "gs" and have

/cl  { gr gs newpath 3 index 3 index moveto 1 index
       4 -1 roll lineto  exch 1 index lineto lineto
       closepath clip newpath } def

and end everything with a "gr". Not too sure that is perfectly safe,
though... 

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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