[R] update'ing trellis object

[Gabor Grothendieck]

On Sun, Oct 4, 2009 at 3:45 PM, Deepayan Sarkar
<deepayan.sarkar at gmail.com> wrote:
>
> Yes, unfortunately the trellis object cannot distinguish between the
> "legend" and the "key" any more.
>

If you are willing to muck around at the grid level you can do it.
First list out the grid objects using grid.ls(). Now looking for 3
grid text objects in proximity we see 3 such objects as descendants of
GRID.frame.215 and we examine the first one which, GRID.text.218,
which indeed contains setosa in its label.  Finally we zap the labels
of those three grid text objects.

> library(grid)
> print(fig)
> grid.ls()
GRID.rect.233
plot1.xlab
plot1.ylab
GRID.segments.234
GRID.segments.235
GRID.text.236
GRID.segments.237
GRID.text.238
GRID.segments.239
GRID.points.240
GRID.points.241
GRID.points.242
GRID.rect.243
GRID.frame.215
  GRID.cellGrob.217
    GRID.rect.216
  GRID.cellGrob.219
    GRID.text.218
  GRID.cellGrob.221
    GRID.text.220
  GRID.cellGrob.223
    GRID.text.222
GRID.frame.224
  GRID.cellGrob.226
    GRID.rect.225
  GRID.cellGrob.228
    GRID.text.227
> str(grid.get("GRID.text.218"))
List of 11
 $ label        : chr "setosa"
 $ x            :Class 'unit'  atomic [1:1] 0
  .. ..- attr(*, "unit")= chr "npc"
  .. ..- attr(*, "valid.unit")= int 0
 $ y            :Class 'unit'  atomic [1:1] 0.5
  .. ..- attr(*, "unit")= chr "npc"
  .. ..- attr(*, "valid.unit")= int 0
 $ just         : chr "centre"
 $ hjust        : num 0
 $ vjust        : NULL
 $ rot          : num 0
 $ check.overlap: logi FALSE
 $ name         : chr "GRID.text.218"
 $ gp           :List of 6
  ..$ col       : chr "black"
  ..$ alpha     : num 1
  ..$ lineheight: num 1
  ..$ fontface  : num 1
  ..$ cex       : num 1
  ..$ font      : int 1
  ..- attr(*, "class")= chr "gpar"
 $ vp           : NULL
 - attr(*, "class")= chr [1:3] "text" "grob" "gDesc"
> grid.edit("GRID.text.218", label = "")
> grid.edit("GRID.text.220", label = "")
> grid.edit("GRID.text.222", label = "")