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## update elements of a list recursively.
updateList <-
function (x, val)
{
if (is.null(x))
x <- list()
modifyList(x, val)
}
## common operations that only make sense in certain contexts
useOuterStrips <-
function(x,
strip = strip.default,
strip.left = strip.custom(horizontal = FALSE),
strip.lines = 1,
strip.left.lines = strip.lines)
{
dimx <- dim(x)
stopifnot(inherits(x, "trellis"))
stopifnot(length(dimx) == 2)
opar <- if (is.null(x$par.settings)) list() else x$par.settings
par.settings <-
modifyList(opar,
list(layout.heights =
if (x$as.table) list(strip = c(strip.lines, rep(0, dimx[2]-1)))
else list(strip = c(rep(0, dimx[2]-1), strip.lines)),
layout.widths =
list(strip.left = c(strip.left.lines, rep(0, dimx[1]-1)))))
if (is.character(strip))
strip <- get(strip)
if (is.logical(strip) && strip)
strip <- strip.default
new.strip <-
if (is.function(strip))
{
function(which.given, which.panel, var.name, ...) {
if (which.given == 1)
strip(which.given = 1,
which.panel = which.panel[1],
var.name = var.name[1],
...)
}
}
else strip
if (is.character(strip.left))
strip.left <- get(strip.left)
if (is.logical(strip.left) && strip.left)
strip.left <- strip.custom(horizontal = FALSE)
new.strip.left <-
if (is.function(strip.left))
{
function(which.given, which.panel, var.name, ...) {
if (which.given == 2)
strip.left(which.given = 1,
which.panel = which.panel[2],
var.name = var.name[2],
...)
}
}
else strip.left
update(x,
par.settings = par.settings,
strip = new.strip,
strip.left = new.strip.left,
par.strip.text = list(lines = 0.5),
layout = dimx)
}
resizePanels <-
function(x, h = 1, w = 1)
{
if (!missing(x))
return(update(x,
par.settings =
list(layout.heights = list(panel = h),
layout.widths = list(panel = w))))
cl <- trellis.currentLayout()
if (all(dim(cl) > 1))
stop("layout must have single column or single row.")
if (all(dim(cl) == 1))
{
message("Nothing to be done.")
return()
}
if (any(cl == 0)) stop("missing panels not allowed")
if (dim(cl)[2] == 1) ## single column
{
pos <- seq(length = dim(cl)[1])
heights <-
sapply(pos,
function(i) {
trellis.focus("panel", 1, i, highlight = FALSE)
ylim <- current.panel.limits()$ylim
trellis.unfocus()
diff(range(ylim))
})
return(trellis.last.object(par.settings =
list(layout.heights = list(panel = heights))))
}
else if (dim(cl)[1] == 1) ## single row
{
pos <- seq(length = dim(cl)[2])
widths <-
sapply(pos,
function(i) {
trellis.focus("panel", i, 1, highlight = FALSE)
xlim <- current.panel.limits()$xlim
trellis.unfocus()
diff(range(xlim))
})
return(trellis.last.object(par.settings =
list(layout.widths = list(panel = widths))))
}
print(dim(cl))
stop("shouldn't come here")
}
## utility functions to extract components of a formula. Don't work
## reliably with unusual symbols
.responseName <- function(formula)
{
if (length(formula) == 3) as.character(formula[2])
else stop("invalid formula")
}
.covariateName <- function(formula)
{
RHS <-
if (length(formula) == 3) as.character(formula[3])
else if (length(formula) == 2) as.character(formula[2])
else stop("invalid formula")
RHS <- strsplit(RHS, " | ", fixed = TRUE)[[1]]
RHS[1]
}
.groupsName <- function(formula)
{
RHS <-
if (length(formula) == 3) as.character(formula[3])
else if (length(formula) == 2) as.character(formula[2])
else stop("invalid formula")
RHS <- strsplit(RHS, " | ", fixed = TRUE)[[1]]
RHS[2]
}
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