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#' @name applyEmptyImageDimensions-methods
#' @docType methods
#' @aliases applyEmptyImageDimensions
#' @title Apply Subsetting from Empty Image Dimensions
#' @description Simple wrapper for subsetting an image with indices,
#' dropping empty dimensions.
#' @param img image, nifti object, or array
#' @param inds indices of subset from \code{\link{getEmptyImageDimensions}} or
#' \code{\link{dropEmptyImageDimensions}}.
#' @param reorient Should image be reoriented if a filename?
#' @param ... not used
#' @return Object of class \code{nifti} or \code{array} if \code{nifti}
#' is not supplied
#' @note \code{apply_empty_dim} is a shorthand for
#' \code{applyEmptyImageDimensions} with all the same arguments.
#' @seealso \code{\link{getEmptyImageDimensions}},
#' \code{\link{dropEmptyImageDimensions}}
#' @export
#' @examples
#' set.seed(5)
#' dims = rep(10, 3)
#' arr = array(rnorm(prod(dims)), dim = dims)
#' arr[,,10] = 0
#' nim = oro.nifti::nifti(arr)
#' inds = getEmptyImageDimensions(nim)
#' inds_arr = getEmptyImageDimensions(arr)
#' testthat::expect_equal(inds, inds_arr)
#'
#' out = applyEmptyImageDimensions(nim, inds = inds)
#' out_arr = applyEmptyImageDimensions(arr, inds = inds)
#' testthat::expect_equal(out_arr, array(out, dim = dim(out)))
#' out = apply_empty_dim(nim, inds = inds)
#'
#' set.seed(5)
#' dims = rep(10, 3)
#' arr = array(rnorm(prod(dims)), dim = dims)
#' arr[,,10] = 0
#' nim = oro.nifti::nifti(arr)
#' inds = getEmptyImageDimensions(nim)
#' rnifti = RNifti::asNifti(nim)
#' timg = tempimg(nim)
#' limg = list(factor(timg), factor(timg))
#' apply_empty_dim(nim, inds = inds)
#' func = function(...) applyEmptyImageDimensions(..., inds = inds)
#' func(arr)
#' func(nim)
#' func(rnifti)
#' func(timg)
#' func(limg)
#'
#'
#'
setGeneric("applyEmptyImageDimensions",
function(img,
inds,
reorient = FALSE,
...) standardGeneric("applyEmptyImageDimensions"))
.applyEmptyImageDimensions <- function(img,
inds,
reorient = FALSE,
...) {
dimg = dim(img)
ndim = length(dimg)
if (ndim > 3) {
stop(paste0("Only images with 3 dimensions supported, ",
"as checked by length(dim(img))"))
}
if (ndim == 2) {
i2 = img[inds[[1]], inds[[2]]]
} else {
i2 = img[inds[[1]], inds[[2]], inds[[3]]]
}
return(i2)
}
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,nifti-method
#' @export
setMethod("applyEmptyImageDimensions", "nifti",
function(img,
inds,
...) {
res = .applyEmptyImageDimensions(
img = img, inds = inds, ...)
res = copyNIfTIHeader(img = img,
arr = res,
drop = TRUE)
return(res)
})
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,nifti-method
#' @export
setMethod("applyEmptyImageDimensions", "character",
function(img,
inds,
reorient = FALSE,
...) {
img = check_nifti(img, reorient = reorient)
res = applyEmptyImageDimensions(img, inds = inds, ...)
return(res)
})
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,factor-method
#'
#' @export
setMethod("applyEmptyImageDimensions", "factor",
function(img,
inds,
reorient = FALSE,
...) {
img = as.character(img)
res = applyEmptyImageDimensions(img = img, inds = inds, ...)
return(res)
})
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,list-method
#' @export
setMethod("applyEmptyImageDimensions", "list",
function(img,
inds,
...) {
### add vector capability
res = lapply(img, applyEmptyImageDimensions,
inds = inds,
...)
return(res)
})
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,array-method
#' @export
setMethod("applyEmptyImageDimensions", "array",
function(img,
inds,
...) {
res = .applyEmptyImageDimensions(
img = img, inds = inds, ...)
return(res)
})
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,anlz-method
#' @export
setMethod("applyEmptyImageDimensions", "anlz",
function(img,
inds,
...) {
img = as.nifti(img)
res = applyEmptyImageDimensions(img = img, inds = inds, ...)
return(res)
})
#' @rdname applyEmptyImageDimensions-methods
#' @aliases applyEmptyImageDimensions,ANY-method
#' @export
setMethod("applyEmptyImageDimensions", "ANY",
function(img,
inds,
reorient = FALSE,
...) {
# workaround because can't get class
if (inherits(img, "niftiImage")) {
img = check_nifti(img, reorient = reorient)
res = applyEmptyImageDimensions(img = img, inds = inds, ...)
return(res)
} else {
stop("Not implemented for this type!")
}
return(img)
})
#' @rdname applyEmptyImageDimensions-methods
#' @export
apply_empty_dim <- function(img,
...) {
applyEmptyImageDimensions(img = img, ...)
}
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