alphacol(col, alpha = FALSE)
colors()
), a hexadecimal string of the form
"#rrggbb"
or "#rrggbbaa"
(see
rgb
), or a positive integer i
meaning palette()[i]
. Non-numeric values
are coerced to character.alphacol
adds an alpha value to a colour
specification and convert to a hexadecimal colour string.
# Alphasalphacol('red') # do nothing[1] "#ff0000"alphacol('red', 10)[1] "#ff0000ff"alphacol('#aabbcc', 5)[1] "#aabbccff"alphacol(4, 5)[1] "#0000ffff"