Hi
Deepayan Sarkar wrote:
On Wed, Dec 9, 2009 at 10:08 AM, Cable, Samuel B Civ USAF AFMC
AFRL/RVBXI <samuel.ca...@hanscom.af.mil> wrote:
Thanks, all, for the help. Much obliged. I realize now that I should
have said that I am using lattice graphics. The par() command has not
been helpful in convincing lattice to plot outside of the default
window. Any other advice is appreciated. Thanks again.
[Sorry for the late reply, I missed your mail the first time around.]
I think you need the 'legend' functionality. A naive example is:
arrowFun <- function(x = c(0.25, 0.75), ...)
{
require(grid)
linesGrob(x = x, y = 0.5, default.units = "npc",
arrow = arrow(...))
}
xyplot(1 ~ 1, legend = list(top = list(fun = arrowFun, args = list(x =
c(0.1, 0.5)))))
xyplot(1 ~ 1, legend = list(top = list(fun = arrowFun(type = "closed"))))
Your actual requirements would be more complicated because (1) your
grob will be more complicated (but see draw.key and draw.colorkey for
examples) and (2) your legend has to get resized in sync with the
plot. The second part is more complicated, and the simplest approach
would be to fix the absolute size of your panels (see ?print.trellis).
Of course the easiest solution would be to draw your arrow inside the
panel.
Or you could draw the arrow from within the context of the panel, BUT
locate the drawing outside the panel. It's not clear exactly what you
need, but perhaps something like this ...
xyplot(1:10 ~ 1:10)
trellis.focus("panel", 1, 1, clip.off=TRUE)
grid.segments(x0=unit(1, "native"),
y0=unit(1, "npc") + unit(1.5, "lines"),
x1=unit(5, "native"),
y1=unit(1, "npc") + unit(1.5, "lines"),
arrow=arrow(type="closed"))
trellis.unfocus()
... where the x-locations of the line segment are relative to the x-axis
scale on the panel, but the y-locations place it outside the panel (a
similar call to grid.text() would work for the labelling) gives you some
ideas (?)
Paul
-Deepayan
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The University of Auckland
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