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#' ISOImageryGCPCollection
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @keywords ISO imagery gcp collection
#' @return Object of \code{\link{R6Class}} for modelling an ISO imagery gcp collection
#' @format \code{\link{R6Class}} object.
#'
#' @examples
#' md <- ISOImageryGCP$new()
#' require(sf)
#' pt <- sf::st_point(c(1,1))
#' md$setGeographicCoordinates(sfg = pt)
#' xml <- md$encode()
#'
#' @references
#' ISO 19115-2:2009 - Geographic information -- Metadata Part 2: Extensions for imagery and gridded data
#'
#' @author Emmanuel Blondel <emmanuel.blondel1@@gmail.com>
#'
ISOImageryGCP <- R6Class("ISOImageryGCP",
inherit = GMLAbstractObject,
private = list(
xmlElement = "MI_GCP",
xmlNamespacePrefix = "GMI"
),
public = list(
#'@field geographicCoordinates geographicCoordinates
geographicCoordinates = matrix(NA_real_, 1, 2),
#'@description Initializes object
#'@param xml object of class \link{XMLInternalNode-class}
initialize = function(xml = NULL){
super$initialize(xml = xml, wrap = TRUE)
},
#'@description Set geographic coordinates
#'@param sfg simple feature object from \pkg{sf}
#'@param m object of class \link{matrix}
setGeographicCoordinates = function(sfg = NULL, m = NULL){
if(!is.null(sfg)){
if(!all(sapply(c("sfg","POINT"), function(x){is(sfg, x)}))) stop("Input 'sfg' object should be a 'point'")
m <- as.matrix(sfg)
}else if(!is.null(m)){
if(!is.matrix(m)){
stop("The argument 'm' should a matrix")
}
}
self$geographicCoordinates <- GMLElement$create(element = "geographicCoordinates", xmlNamespacePrefix = "GMI")
self$geographicCoordinates$pos <- GMLElement$create(element = "pos", value = m)
}
)
)
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