Hi
Gabor Grothendieck wrote:
Here is the code once again. This time I have supplied two
names methods and a getChildren.viewport function to
encapsulate the corresponding grid internals. It would
be easiest if grid provided these itself but in the absence
of that this does encapsulate dependencies on grid
internals to a well defined set of functions. Note that
names is only used in 'with' and 'with' will be eliminated
once Deepayan adds the use.viewport= (or whatever
its called) to print. I am not sure from your response
whether or not you intend to add these items to the grid
API but in any case this provides an intermediate
level of safety.
Yep, I've made a note to look at adding these to the grid API.
Thanks.
Paul
library(grid)
library(lattice)
pushLayout <- function(nr, nc, name="layout") {
pushViewport(viewport(layout=grid.layout(nr, nc), name=name))
for (i in 1:nr) {
for (j in 1:nc) {
pushViewport(viewport(layout.pos.row=i, layout.pos.col=j))
upViewport()
}
}
upViewport()
}
names.vpPath <- names.viewport <- function(x) x$name
with.vpPath <- with.viewport <- function(data, expr, ...) {
# if data is a vpPath it cannot be ROOT since
# NULL will never dispatch here
depth <- if (data$name == "ROOT") 0 else downViewport(names(data))
result <- eval.parent(substitute(expr))
upViewport(depth)
invisible(result)
}
getChildren.viewport <- function(x) x$children
grid.newpage()
# specify number of cells to fill and number of rows
n <- 5; nr <- 3
nc <- ceiling(n/nr)
downViewport(pushLayout(nr, nc))
vpt <- current.vpTree(all = FALSE)
for(k in 1:n) with(getChildren.viewport(vpt)[[k]],
print( xyplot(v ~ v, list(v = 1:k)), newpage = FALSE )
)
--
Dr Paul Murrell
Department of Statistics
The University of Auckland
Private Bag 92019
Auckland
New Zealand
64 9 3737599 x85392
[EMAIL PROTECTED]
http://www.stat.auckland.ac.nz/~paul/
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