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# Convert a SpatialPolygons or SpatialPolygonsDataFrame object
# to a well-known binary (WKB) geometry representation of polygons
#' Convert SpatialPolygons to \acronym{WKB} MultiPolygon
#'
#' Converts an object of class \code{SpatialPolygons} or
#' \code{SpatialPolygonsDataFrame} to a list of well-known binary
#' (\acronym{WKB}) geometry representations of type MultiPolygon.
#'
#' This function is called by the \code{\link{writeWKB}} function. Call the
#' \code{\link{writeWKB}} function instead of calling this function directly.
#'
#' @param obj an object of class
#' \code{\link[sp:SpatialPolygons-class]{SpatialPolygons}} or
#' \code{\link[sp:SpatialPolygonsDataFrame-class]{SpatialPolygonsDataFrame}}.
#' @param endian The byte order (\code{"big"} or \code{"little"}) for encoding
#' numeric types. The default is \code{"little"}.
#' @return A \code{list} with class \code{AsIs}. The length of the returned list
#' is the same as the length of the argument \code{obj}. Each element of the
#' returned list is a \code{\link[base]{raw}} vector consisting of a
#' well-known binary (\acronym{WKB}) geometry representation of type
#' MultiPolygon.
#'
#' When this function is run in TIBCO Enterprise Runtime for R
#' (\acronym{TERR}), the return value has the SpotfireColumnMetaData attribute
#' set to enable TIBCO Spotfire to recognize it as a \acronym{WKB} geometry
#' representation.
#' @examples
#' # load package sp
#' library(sp)
#'
#' # create an object of class SpatialPolygons
#' triangle <- Polygons(
#' list(
#' Polygon(data.frame(x = c(2, 2.5, 3, 2), y = c(2, 3, 2, 2)))
#' ), "triangle")
#' rectangles <- Polygons(
#' list(
#' Polygon(data.frame(x = c(0, 0, 1, 1, 0), y = c(0, 1, 1, 0, 0))),
#' Polygon(data.frame(x = c(0, 0, 2, 2, 0), y = c(-2, -1, -1, -2, -2)))
#' ), "rectangles")
#' Sp <- SpatialPolygons(list(triangle, rectangles))
#'
#' # convert to WKB MultiPolygon
#' wkb <- wkb:::SpatialPolygonsToWKBMultiPolygon(Sp)
#'
#' # use as a column in a data frame
#' ds <- data.frame(ID = names(Sp), Geometry = wkb)
#'
#' # calculate envelope columns and cbind to the data frame
#' coords <- wkb:::SpatialPolygonsEnvelope(Sp)
#' ds <- cbind(ds, coords)
#' @seealso \code{\link{writeWKB}}, \code{\link{SpatialPolygonsEnvelope}}
#' @noRd
SpatialPolygonsToWKBMultiPolygon <- function(obj, endian) {
wkb <- lapply(X = obj@polygons, FUN = function(mymultipolygon) {
rc <- rawConnection(raw(0), "r+")
on.exit(close(rc))
if(endian == "big") {
writeBin(as.raw(0L), rc)
} else {
writeBin(as.raw(1L), rc)
}
writeBin(6L, rc, size = 4, endian = endian)
mypolygons <- mymultipolygon@Polygons
writeBin(length(mypolygons), rc, size = 4, endian = endian)
lapply(X = mypolygons, FUN = function(mypolygon) {
if(endian == "big") {
writeBin(as.raw(0L), rc)
} else {
writeBin(as.raw(1L), rc)
}
writeBin(3L, rc, size = 4, endian = endian)
writeBin(1L, rc, size = 4, endian = endian)
coords <- mypolygon@coords
writeBin(nrow(coords), rc, size = 4, endian = endian)
apply(X = coords, MARGIN = 1, FUN = function(coord) {
writeBin(coord[1], rc, size = 8, endian = endian)
writeBin(coord[2], rc, size = 8, endian = endian)
NULL
})
})
rawConnectionValue(rc)
})
if(identical(version$language, "TERR")) {
attr(wkb, "SpotfireColumnMetaData") <-
list(ContentType = "application/x-wkb", MapChart.ColumnTypeId = "Geometry")
}
I(wkb)
}
#' Convert SpatialPolygons to \acronym{WKB} Polygon
#'
#' Converts an object of class \code{SpatialPolygons} or
#' \code{SpatialPolygonsDataFrame} to a list of well-known binary
#' (\acronym{WKB}) geometry representations of type Polygon.
#'
#' This function is called by the \code{\link{writeWKB}} function. Call the
#' \code{\link{writeWKB}} function instead of calling this function directly.
#'
#' @param obj an object of class
#' \code{\link[sp:SpatialPolygons-class]{SpatialPolygons}} or
#' \code{\link[sp:SpatialPolygonsDataFrame-class]{SpatialPolygonsDataFrame}}.
#' @param endian The byte order (\code{"big"} or \code{"little"}) for encoding
#' numeric types. The default is \code{"little"}.
#' @return A \code{list} with class \code{AsIs}. The length of the returned list
#' is the same as the length of the argument \code{obj}. Each element of the
#' returned list is a \code{\link[base]{raw}} vector consisting of a
#' well-known binary (\acronym{WKB}) geometry representation of type Polygon.
#'
#' When this function is run in TIBCO Enterprise Runtime for R
#' (\acronym{TERR}), the return value has the SpotfireColumnMetaData attribute
#' set to enable TIBCO Spotfire to recognize it as a \acronym{WKB} geometry
#' representation.
#' @examples
#' # load package sp
#' library(sp)
#'
#' # create an object of class SpatialPolygons
#' triangle <- Polygons(
#' list(
#' Polygon(data.frame(x = c(2, 2.5, 3, 2), y = c(2, 3, 2, 2)))
#' ), "triangle")
#' rectangles <- Polygons(
#' list(
#' Polygon(data.frame(x = c(0, 0, 1, 1, 0), y = c(0, 1, 1, 0, 0))),
#' Polygon(data.frame(x = c(0, 0, 2, 2, 0), y = c(-2, -1, -1, -2, -2)))
#' ), "rectangles")
#' Sp <- SpatialPolygons(list(triangle, rectangles))
#'
#' # convert to WKB Polygon
#' wkb <- wkb:::SpatialPolygonsToWKBPolygon(Sp)
#'
#' # use as a column in a data frame
#' ds <- data.frame(ID = names(Sp), Geometry = wkb)
#'
#' # calculate envelope columns and cbind to the data frame
#' coords <- wkb:::SpatialPolygonsEnvelope(Sp)
#' ds <- cbind(ds, coords)
#' @seealso \code{\link{writeWKB}}, \code{\link{SpatialPolygonsEnvelope}}
#' @noRd
SpatialPolygonsToWKBPolygon <- function(obj, endian) {
wkb <- lapply(X = obj@polygons, FUN = function(mypolygon) {
rc <- rawConnection(raw(0), "r+")
on.exit(close(rc))
if(endian == "big") {
writeBin(as.raw(0L), rc)
} else {
writeBin(as.raw(1L), rc)
}
writeBin(3L, rc, size = 4, endian = endian)
rings <- mypolygon@Polygons
writeBin(length(rings), rc, size = 4, endian = endian)
lapply(X = rings, FUN = function(ring) {
coords <- ring@coords
writeBin(nrow(coords), rc, size = 4, endian = endian)
apply(X = coords, MARGIN = 1, FUN = function(coord) {
writeBin(coord[1], rc, size = 8, endian = endian)
writeBin(coord[2], rc, size = 8, endian = endian)
NULL
})
})
rawConnectionValue(rc)
})
if(identical(version$language, "TERR")) {
attr(wkb, "SpotfireColumnMetaData") <-
list(ContentType = "application/x-wkb", MapChart.ColumnTypeId = "Geometry")
}
I(wkb)
}
#' Envelope of SpatialPolygons
#'
#' Takes an object of class \code{SpatialPolygons} or
#' \code{SpatialPolygonsDataFrame} and returns a data frame with six columns
#' representing the envelope of each object of class \code{Polygons}.
#'
#' This function is called by the \code{\link{writeEnvelope}} function. Call the
#' \code{\link{writeEnvelope}} function instead of calling this function
#' directly.
#'
#' @param obj an object of class
#' \code{\link[sp:SpatialPolygons-class]{SpatialPolygons}} or
#' \code{\link[sp:SpatialPolygonsDataFrame-class]{SpatialPolygonsDataFrame}}.
#' @return A data frame with six columns named XMax, XMin, YMax, YMin, XCenter,
#' and YCenter. The first four columns represent the corners of the bounding
#' box of each object of class \code{Polygons}. The last two columns represent
#' the center of the bounding box of each object of class \code{Polygons}. The
#' number of rows in the returned data frame is the same as the length of the
#' argument \code{obj}.
#'
#' When this function is run in TIBCO Enterprise Runtime for R
#' (\acronym{TERR}), the columns of the returned data frame have the
#' SpotfireColumnMetaData attribute set to enable TIBCO Spotfire to recognize
#' them as containing envelope information.
#' @seealso \code{\link{writeEnvelope}}
#'
#' Example usage at \code{\link{SpatialPolygonsToWKBPolygon}}
#' @noRd
#' @importFrom sp bbox
SpatialPolygonsEnvelope <- function(obj) {
coords <- as.data.frame(t(vapply(X = obj@polygons, FUN = function(mypolygon) {
c(XMax = bbox(mypolygon)["x", "max"],
XMin = bbox(mypolygon)["x", "min"],
YMax = bbox(mypolygon)["y", "max"],
YMin = bbox(mypolygon)["y", "min"],
XCenter = mypolygon@labpt[1],
YCenter = mypolygon@labpt[2])
}, FUN.VALUE = rep(0, 6))))
if(identical(version$language, "TERR")) {
attr(coords$XMax, "SpotfireColumnMetaData") <- list(MapChart.ColumnTypeId = "XMax")
attr(coords$XMin, "SpotfireColumnMetaData") <- list(MapChart.ColumnTypeId = "XMin")
attr(coords$YMax, "SpotfireColumnMetaData") <- list(MapChart.ColumnTypeId = "YMax")
attr(coords$YMin, "SpotfireColumnMetaData") <- list(MapChart.ColumnTypeId = "YMin")
attr(coords$XCenter, "SpotfireColumnMetaData") <- list(MapChart.ColumnTypeId = "XCenter")
attr(coords$YCenter, "SpotfireColumnMetaData") <- list(MapChart.ColumnTypeId = "YCenter")
}
coords
}
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