R help - Aug 2012 - Controlling line-join style in Lattice

R users,

I am creating a series of scatterplots with Lattice's xyplot().  Some of the
plotting symbols are squares with thick borders.  The corners of the squares are
rounded by default; I would like them to be square.  In base graphics this is
easily done with par(ljoin = "mitre"), and in grid graphics with
gpar(linejoin = "mitre").  Is there an analogous parameter in Lattice?
Passing ljoin as an argument to xyplot() or panel functions doesn't seem to
work, and I can't find anything promising in lattice.par.get().

Thanks,
Andrew Morgan
Department of Genetics
University of North Carolina - Chapel Hill

You can set grid parameters in the grid.pars component of
trellis.par.get().

  x <- 1:4; y <- c(1,3,2,4)
  xyplot(y ~ x, type = "l", lwd = 20)  # default linejoin

  ## set linejoin to 'mitre'
  trellis.par.set(grid.pars = list(linejoin = "mitre"))
  xyplot(y ~ x, type = "l", lwd = 20)

Peter Ehlers

On 2012-08-22 11:09, Morgan, Andrew Parker wrote:
> R users,
>
> I am creating a series of scatterplots with Lattice's xyplot().  Some
of the plotting symbols are squares with thick borders.  The corners of the
squares are rounded by default; I would like them to be square.  In base
graphics this is easily done with par(ljoin = "mitre"), and in grid
graphics with gpar(linejoin = "mitre").  Is there an analogous
parameter in Lattice?  Passing ljoin as an argument to xyplot() or panel
functions doesn't seem to work, and I can't find anything promising in
lattice.par.get().
>
> Thanks,
> Andrew Morgan
> Department of Genetics
> University of North Carolina - Chapel Hill
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