# TODO:
# this function is from http://www.magesblog.com/2013/04/how-to-change-alpha-value-of-colours-in.html
# so may need a rewrite
# old name: add.alpha
#' @export
add_alpha_ <- function(col, alpha = 1){
if(missing(col))
stop("Please provide a vector of colours.")
if(length(col) == 0) {
stop("col is of length 0")
}
apply(sapply(col, col2rgb)/255, 2,
function(x)
rgb(x[1], x[2], x[3], alpha=alpha))
}
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