FSA: col2rgbt – R documentation

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col2rgbt

Converts an R color to RGB (red/green/blue) including a transparency (alpha channel).

Description

Converts an R color to RGB (red/green/blue) including a transparency (alpha channel). Similar to col2rgb except that a transparency (alpha channel) can be included.

Usage

col2rgbt(col, transp = 1)

Arguments

`col`	A vector of any of the three kinds of R color specifications (i.e., either a color name (as listed by `colors`()), a hexadecimal string of the form "#rrggbb" or "#rrggbbaa" (see `rgb`), or a positive integer i meaning `palette`()[i].
`transp`	A numeric vector that indicates the transparency level for the color. The transparency values must be greater than 0. Transparency values greater than 1 are interpreted as the number of points plotted on top of each other before the transparency is lost and is, thus, transformed to the inverse of the transparency value provided.

Value

A vector of hexadecimal strings of the form "#rrggbbaa" as would be returned by rgb.

Author(s)

Derek H. Ogle, derek@derekogle.com

Examples

col2rgbt("black")
col2rgbt("black",1/4)
clrs <- c("black","blue","red","green")
col2rgbt(clrs)
col2rgbt(clrs,1/4)
trans <- (1:4)/5
col2rgbt(clrs,trans)

FSA

Simple Fisheries Stock Assessment Methods

v0.8.32

GPL (>= 2)

Authors

Derek Ogle [aut, cre] (<https://orcid.org/0000-0002-0370-9299>), Powell Wheeler [aut], Alexis Dinno [aut] (Provided base functionality of dunnTest())

Initial release

2021-1-15