#' makeTrans
#'
#' Some function from stack exchange that makes a colour transparent according to a given alpha.
#' @param alpha The alpha required.
#' @name makeTrans
#' @export
makeTrans <- function(..., alpha=0.5) {
if(alpha<0 | alpha>1) {
stop("alpha must be between 0 and 1")
}
alpha <- floor(255*alpha)
newColor <- col2rgb(col=unlist(list(...)), alpha=FALSE)
.makeTrans <- function(col, alpha) {
rgb(red=col[1], green=col[2], blue=col[3], alpha=alpha, maxColorValue=255)
}
newColor <- apply(newColor, 2, .makeTrans, alpha=alpha)
return(newColor)
}
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