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Convert color to Hex string

Source: R/strings.R
col2hexStr.Rd

Convert color to Hex string

Usage

col2hexStr(col, alpha = NULL, prefix = "#", ...)

Arguments

col

character or integer indicating color

alpha

NULL or numeric, transparency. See grDevices::rgb

prefix

character, default is "#"

...

passing to adjustcolor

Value

characters containing the hex value of each color. See details

Details

col2hexStr converts colors such as 1, 2, 3, "red", "blue", ... into hex strings that can be easily recognized by `HTML`, `CSS` and `JavaScript`. Internally this function uses adjustcolor with two differences:

  1. the returned hex string does not contain alpha value if alpha is NULL;

  2. the leading prefix "#" can be customized

See also

adjustcolor

Examples


col2hexStr(1, prefix = '0x')      # "0x000000"
#> [1] "0x000000"
col2hexStr('blue')                # "#0000FF"
#> [1] "#0000FF"

# Change default palette, see "grDevices::colors()"
grDevices::palette(c('orange3', 'skyblue1'))
col2hexStr(1)                     # Instead of #000000, #CD8500
#> [1] "#CD8500"