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#' @include mesh.R
#' @include deprecated.R
#' @importFrom sp coordinates proj4string proj4string<-
# fm_as_segm ####
#' @export
#' @rdname fm_as_segm
#' @param crs A crs object
#' @param closed logical; whether to treat a point sequence as a closed polygon.
#' Default: `FALSE`
fm_as_segm.matrix <-
function(x, reverse = FALSE, grp = NULL, is.bnd = FALSE, crs = NULL, closed = FALSE, ...) {
loc <- x
n <- dim(loc)[1L]
if (closed) {
idx <- c(seq_len(n), 1L)
} else {
idx <- seq_len(n)
}
if (reverse) {
idx <- rev(idx)
if (!is.null(grp)) {
grp <- rev(grp)
}
}
fm_segm(
loc = loc, idx = idx, grp = grp, is.bnd = is.bnd, crs = fm_CRS(crs)
)
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.SpatialPoints <-
function(x, reverse = FALSE, grp = NULL, is.bnd = TRUE, closed = FALSE, ...) {
crs <- fm_CRS(x)
loc <- sp::coordinates(x)
n <- dim(loc)[1L]
if (closed) {
idx <- c(seq_len(n), 1L)
} else {
idx <- seq_len(n)
}
if (reverse) {
idx <- rev(idx)
if (!is.null(grp)) {
grp <- rev(grp)
}
}
fm_segm(
loc = loc, idx = idx, grp = grp, is.bnd = is.bnd, crs = crs
)
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.SpatialPointsDataFrame <-
function(x, ...) {
fm_as_segm.SpatialPoints(x, ...)
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.Line <-
function(x, reverse = FALSE, grp = NULL, crs = NULL, ...) {
loc <- x@coords
n <- dim(loc)[1L]
if (reverse) {
idx <- seq(n, 1L, length.out = n)
if (!is.null(grp)) {
grp <- rev(grp)
}
} else {
idx <- seq_len(n)
}
fm_segm(
loc = loc, idx = idx, grp = grp, is.bnd = FALSE, crs = fm_CRS(crs)
)
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.Lines <-
function(x, join = TRUE, grp = NULL, crs = NULL, ...) {
segm <- as.list(lapply(
seq_len(length(x@Lines)),
function(k) {
x <- x@Lines[[k]]
if (!is.null(grp)) {
grp_ <- grp[k]
} else {
grp_ <- NULL
}
fm_as_segm(x, grp = grp_, crs = crs, ...)
}
))
if (join) {
segm <- fm_segm_join(segm, grp = grp)
}
segm
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.SpatialLines <-
function(x, join = TRUE, grp = NULL, ...) {
crs <- fm_CRS(x)
segm <- list()
for (k in seq_len(length(x@lines))) {
segm[[k]] <- fm_as_segm(x@lines[[k]],
join = TRUE,
crs = crs, ...
)
}
if (join) {
if (missing(grp)) {
grp <- seq_len(length(segm))
}
segm <- fm_segm_join(segm, grp = grp)
}
segm
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.SpatialLinesDataFrame <-
function(x, ...) {
fm_as_segm.SpatialLines(x, ...)
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.SpatialPolygons <-
function(x, join = TRUE, grp = NULL, ...) {
crs <- fm_CRS(x)
segm <- list()
for (k in seq_len(length(x@polygons))) {
segm[[k]] <-
fm_as_segm(x@polygons[[k]], join = TRUE, crs = crs)
}
if (join) {
if (missing(grp)) {
grp <- seq_len(length(segm))
}
segm <- fm_segm_join(segm, grp = grp)
}
segm
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.SpatialPolygonsDataFrame <-
function(x, ...) {
fm_as_segm.SpatialPolygons(x, ...)
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.Polygons <-
function(x, join = TRUE, crs = NULL, grp = NULL, ...) {
segm <- as.list(lapply(
x@Polygons,
function(x) fm_as_segm(x, crs = fm_CRS(crs), ...)
))
if (join) {
if (missing(grp)) {
grp <- seq_len(length(segm))
}
segm <- fm_segm_join(segm, grp = grp)
}
segm
}
#' @export
#' @rdname fm_as_segm
fm_as_segm.Polygon <-
function(x, crs = NULL, ...) {
loc <- x@coords[-dim(x@coords)[1L], , drop = FALSE]
n <- dim(loc)[1L]
if (x@hole) {
if (x@ringDir == 1) {
idx <- c(1L:n, 1L)
} else {
idx <- c(1L, seq(n, 1L, length.out = n))
}
} else if (x@ringDir == 1) {
idx <- c(1L, seq(n, 1L, length.out = n))
} else {
idx <- c(1L:n, 1L)
}
fm_segm(
loc = loc,
idx = idx,
is.bnd = TRUE,
crs = fm_CRS(crs)
)
}
#' @export
#' @describeIn fmesher-deprecated `r lifecycle::badge("deprecated")` in favour of
#' [fm_as_segm()]
fm_sp2segment <- function(...) {
fm_as_segm(...)
}
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