[Rd] Re: [R] problem clipping R postscript plots within latex (PR#623)

[p.dalgaard@biostat.ku.dk]

Martin Maechler <maechler@stat.math.ethz.ch> writes:

> (from R-help)
>     PD> Stephen Eglen <stephen@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...
> 
>     PD> It isn't. It grestore-s before actually plotting the stuff that
>     PD> needs to be clipped, so effectively you just disabled R's
>     PD> clipping. A better way would be to start the plotting with a "gs"
>     PD> 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
> 
>     PD> and end everything with a "gr". Not too sure that is perfectly
>     PD> safe, though...
> 
> Are you working on this, Peter?
> Otherwise, "R-bugs" should probably get about the above report..

Done... 

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

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