#' S3 Method to get
#'
#' @importFrom lattice latticeParseFormula
#' @keywords internal
#' @noRd
#' @examples
#' getLayer(mpg ~ wt, data = mtcars)
#' getLayer('mpg', 'wt', data = mtcars, color = 'cyl')
getLayer <- function(x, ...){
UseMethod('getLayer')
}
getLayer.formula <- function(x, data, ...){
fml = lattice::latticeParseFormula(x, data = data)
params_ = list(x = fml$right.name, y = fml$left.name,
data = data, facet = names(fml$condition), ...)
fixLayer(params_)
}
getLayer.default <- function(x, y, data, facet = NULL, ...){
params_ = list(x = x, y = y, data = data, facet = facet, ...)
fixLayer(params_)
}
#' Fix an incomplete layer by adding relevant summaries and modifying the data
#'
#' @keywords internal
#' @noRd
#'
fixLayer <- function(params_){
if (length(params_$y) == 0){
variables = c(params_$x, params_$group)
params_$data = count(params_$data, variables[variables != ""])
params_$y = 'freq'
}
return(params_)
}
#' Convert faceting variable to format required by PolyChartJS
#'
#' @keywords internal
#' @noRd
#' @examples
#' getFacet(c('x', 'y'))
#' getFacet(list(var = "x", type = "wrap", nrows = 1))
#'
getFacet <- function(facet){
if (is.null(facet)) return(list())
if (is.list(facet)) return(facet)
if (length(facet) == 1){
facet = list(type = 'wrap', var = facet)
} else {
facet = list(type = 'grid', x = facet[1], y = facet[2])
}
return(facet)
}
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