Data Engineering and BI courses are free this week!
ac adjusts the transparency of a color or color palette col
to an opacity level alpha (in [0, 1]).
ac(col, alpha = 0.5, use_names = TRUE)A color vector of the same length as col,
transformed by adjustcolor.
A (required) color or color palette (as a vector).
A factor modifying the opacity alpha
(as alpha.f in adjustcolor) to a value in [0, 1].
Default: alpha = .50 (i.e., medium opacity).
A logical value indicating whether color names should be adjusted
to include the values of alpha.
Default: use_names = TRUE.
ac is mostly a wrapper for adjustcolor
of the grDevices package, but allows for more flexible
combinations of (multiple) col and alpha values.
The name ac is an abbreviation of "adjust color",
but is also a mnemonic aid for providing "air conditioning".
seecol for plotting/seeing color palettes;
usecol for using color palettes;
simcol for finding similar colors;
newpal for defining new color palettes;
grepal for finding named colors.
Other color functions:
demopal(),
grepal(),
newpal(),
seecol(),
shades_of(),
simcol(),
usecol()
ac("black") # using alpha = .5 by default
# multiple colors:
cols <- ac(c("black", "gold", "deepskyblue"), alpha = .50)
seecol(cols, main = "Transparent colors")
# multiple alphas:
blacks <- ac("black", alpha = 5:0/5)
seecol(blacks, main = "One col several alpha values")
bgc <- ac(c("black", "gold"), alpha = 1:6/6)
seecol(bgc, main = "More alpha values than cols")
# Using a color palette:
seecol(ac(pal_unikn_pref, 2/3), main = "Adding color transparency by ac()")
# Color names:
seecol(ac(col = pal_unikn_pref, alpha = c(1/5, 4/5), use_names = TRUE))
seecol(ac(col = pal_unikn_pref, alpha = c(1/5, 4/5), use_names = FALSE))
Run the code above in your browser using DataLab