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#' GMLGridFunction
#'
#' @docType class
#' @importFrom R6 R6Class
#' @export
#' @keywords ISO GML GridFunction
#' @return Object of \code{\link{R6Class}} for modelling an GML grid function
#' @format \code{\link{R6Class}} object.
#'
#' @note Class used internally by geometa
#'
#' @references
#' ISO 19136:2007 Geographic Information -- Geographic Markup Language.
#' http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=32554
#' OGC Geography Markup Language. http://www.opengeospatial.org/standards/gml
#'
#' @author Emmanuel Blondel <emmanuel.blondel1@@gmail.com>
#'
GMLGridFunction <- R6Class("GMLGridFunction",
inherit = GMLAbstractObject,
private = list(
xmlElement = "GridFunction",
xmlNamespacePrefix = "GML"
),
public = list(
#'@field sequenceRule sequence rule
sequenceRule = NULL,
#'@field startPoint start point
startPoint = matrix(NA,1,2),
#'@description Initializes object
#'@param xml object of class \link{XMLInternalNode-class}
#'@param element element name
#'@param attrs list of attributes
#'@param defaults list of default values
#'@param wrap wrap element?
initialize = function(xml = NULL, element = NULL, attrs = list(),
defaults = list(), wrap = TRUE){
if(is.null(element)) element <- private$xmlElement
super$initialize(xml, element = element, attrs = attrs,
defaults = defaults, wrap = wrap)
},
#'@description Set sequence rule
#'@param sequenceRule sequence rule, a value among: Linear,Boustrophedonic,
#' Cantor-diagonal,Spiral,Morton,Hilbert
setSequenceRule = function(sequenceRule){
allowedValues <- c("Linear","Boustrophedonic", "Cantor-diagonal",
"Spiral","Morton","Hilbert")
if(!(sequenceRule %in% allowedValues)){
stop(sprintf("The value should be one among [%s]", paste(allowedValues, collapse=",")))
}
self$sequenceRule <- GMLElement$create("sequenceRule", sequenceRule)
},
#'@description Set start point
#'@param x x
#'@param y y
setStartPoint = function(x,y){
self$startPoint <- GMLElement$create("startPoint", matrix(c(x,y),1,2))
}
)
)
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