graphics changes

[Paul Murrell]

hi

i have just made a couple of graphics changes to R to make graphics clipping
more consistent and to make par(xpd) compatible with S.

as a result of these changes, there is a possibility that some graphics
output may "disappear" from existing R code
(i) because the output from rect() is now clipped in PostScript  and
(ii) because par(xpd=T) now means clip to figure region rather than clip to
device region.

the solution to the latter problem is to use par(xpd=NA) instead of
par(xpd=T) - if you have never used par(xpd) then nothing should change.
the solution to the former problem is to start using par(xpd) :)

these changes will only affect the R-release snapshots in the short term,
but ultimately they will be part of the R-devel prerelease and then release
0.65.

paul




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