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### =========================================================================
### Map reference array positions to grid positions and vice-versa
### -------------------------------------------------------------------------
setGeneric("mapToGrid", signature="grid",
function(Mindex, grid, linear=FALSE) standardGeneric("mapToGrid")
)
setGeneric("mapToRef", signature="grid",
function(major, minor, grid, linear=FALSE) standardGeneric("mapToRef")
)
### Return an integer matrix with 1 column per dimension.
.normarg_Mindex <- function(Mindex, ndim, what="'Mindex'")
{
if (!is.numeric(Mindex))
stop(wmsg(what, " must be a numeric vector or matrix"))
if (is.matrix(Mindex)) {
if (ncol(Mindex) != ndim)
stop(wmsg(what, " must have one column (or element ",
"if a vector) per dimension"))
} else {
if (is.array(Mindex))
stop(wmsg(what, " must be a numeric vector or matrix"))
if (length(Mindex) != ndim)
stop(wmsg(what, " must have one element (or column ",
"if a matrix) per dimension"))
Mindex <- matrix(Mindex, nrow=1)
}
if (storage.mode(Mindex) != "integer")
storage.mode(Mindex) <- "integer"
Mindex
}
### Return a numeric vector.
.normarg_ind <- function(ind, what="'ind'")
{
if (!is.numeric(ind))
stop(wmsg(what, " must be a numeric vector"))
if (is.matrix(ind))
stop(wmsg(what, " cannot be a matrix"))
if (suppressWarnings(min(ind, na.rm=TRUE)) < 1)
stop(wmsg(what, " must contain positive indices"))
ind
}
.major_minor_as_list <- function(major, minor, grid, linear=FALSE)
{
if (linear) {
major <- Mindex2Lindex(major, dim(grid))
## 'as.integer=TRUE' is safe to use here because the viewports in
## an ArrayGrid object cannot be longer than 2^31 - 1 (this in turn
## translates in 'all(rowProds(dims(grid)) < .Machine$integer.max)').
minor <- Mindex2Lindex(minor, dims(grid)[major, , drop=FALSE],
as.integer=TRUE)
}
list(major=major, minor=minor)
}
setMethod("mapToGrid", "ArbitraryArrayGrid",
function(Mindex, grid, linear=FALSE)
{
if (!isTRUEorFALSE(linear))
stop("'linear' must be TRUE or FALSE")
ndim <- length(grid@tickmarks)
Mindex <- .normarg_Mindex(Mindex, ndim)
major <- lapply(seq_len(ndim),
function(along) {
1L + findInterval(Mindex[ , along], grid@tickmarks[[along]] + 1L)
}
)
minor <- lapply(seq_len(ndim),
function(along) {
tm <- grid@tickmarks[[along]]
tm_len <- length(tm)
if (tm_len == 0L)
return(rep.int(NA_integer_, nrow(Mindex)))
offset <- c(0L, tm[-tm_len])
Mindex[ , along] - offset[major[[along]]]
}
)
major <- do.call(cbind, major)
minor <- do.call(cbind, minor)
.major_minor_as_list(major, minor, grid, linear=linear)
}
)
.normargs_major_minor <- function(major, minor, grid, linear)
{
if (!isTRUEorFALSE(linear))
stop("'linear' must be TRUE or FALSE")
if (linear) {
major <- .normarg_ind(major, what="when 'linear=TRUE', 'major'")
minor <- .normarg_ind(minor, what="when 'linear=TRUE', 'minor'")
if (length(major) != length(minor))
stop(wmsg("when 'linear=TRUE', 'major' and 'minor' ",
"must have the same length"))
minor <- Lindex2Mindex(minor, dims(grid)[major, , drop=FALSE])
major <- Lindex2Mindex(major, dim(grid))
} else {
ndim <- length(refdim(grid))
major <- .normarg_Mindex(major, ndim, what="'major'")
minor <- .normarg_Mindex(minor, ndim, what="'minor'")
if (nrow(major) != nrow(minor))
stop(wmsg("'major' and 'minor' must have the same number of rows"))
}
list(major=major, minor=minor)
}
setMethod("mapToRef", "ArbitraryArrayGrid",
function(major, minor, grid, linear=FALSE)
{
majmin <- .normargs_major_minor(major, minor, grid, linear)
ans <- majmin$minor
for (along in seq_len(ncol(ans))) {
tm <- grid@tickmarks[[along]]
tm_len <- length(tm)
if (tm_len == 0L)
next
offset <- c(0L, tm[-tm_len])
ans[ , along] <- ans[ , along] + offset[majmin$major[ , along]]
}
ans
}
)
setMethod("mapToGrid", "RegularArrayGrid",
function(Mindex, grid, linear=FALSE)
{
if (!isTRUEorFALSE(linear))
stop("'linear' must be TRUE or FALSE")
ndim <- length(grid@spacings)
Mindex <- .normarg_Mindex(Mindex, ndim)
d <- rep(grid@spacings, each=nrow(Mindex))
Mindex0 <- Mindex - 1L # 0-based indices
major <- 1L + Mindex0 %/% d
minor <- 1L + Mindex0 %% d
.major_minor_as_list(major, minor, grid, linear=linear)
}
)
setMethod("mapToRef", "RegularArrayGrid",
function(major, minor, grid, linear=FALSE)
{
majmin <- .normargs_major_minor(major, minor, grid, linear)
d <- rep(grid@spacings, each=nrow(majmin$major))
(majmin$major - 1L) * d + majmin$minor
}
)
|
