Nothing
#' Shape palette (discrete)
#'
#' @param solid should shapes be solid or not?
#' @export
shape_pal <- function(solid = TRUE) {
force(solid)
function(n) {
if (n > 6) {
msg <- paste("The shape palette can deal with a maximum of 6 discrete ",
"values because more than 6 becomes difficult to discriminate; ",
"you have ", n, ". Consider specifying shapes manually if you ",
"must have them.",
sep = ""
)
warning(paste(strwrap(msg), collapse = "\n"), call. = FALSE)
}
if (solid) {
c(16, 17, 15, 3, 7, 8)[seq_len(n)]
} else {
c(1, 2, 0, 3, 7, 8)[seq_len(n)]
}
}
}
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