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usecol

Use a color or color palette.

Description

usecol allows using a color or color palette pal (e.g., for plotting).

Usage

usecol(
  pal = pal_unikn,
  n = "all",
  alpha = NA,
  use_names = FALSE,
  use_col_ramp = FALSE
)

Arguments

pal

A color palette (as a vector of colors or color palettes). Default: pal = pal_unikn.
n

An integer value specifying the desired number of colors from the palette. Default: n = "all" (i.e., use all colors of a color palette). For the palettes defined by unikn, n is set to a pre-defined selection of colors if the desired number of colors is smaller than the available number. For all other palettes and values of n larger than length(pal), n compresses or extends the palette using colorRampPalette.
alpha

A factor modifying the opacity alpha (as in adjustcolor); to a value in [0,1]. Default: alpha = NA (i.e., no modification of opacity).
use_names

A logical value indicating whether colors should be returned as a named vector. Default: use_names = FALSE, for compatibility with ggplot.
use_col_ramp

A logical value specifying whether the default of using pre-selected colors should be overridden and colorRampPalette should be used to process n. Default: use_col_ramp = FALSE.

Details

usecol also allows modifying and combining color palettes in various ways.

Value

A vector of colors (in character format).

See Also

seecol to plot color palettes; pal_unikn for the default uni.kn color palette.

Other color functions: grepal(), newpal(), seecol()

Examples

usecol(pal = pal_unikn, n = "all")  # default color palette 
usecol(pal = pal_unikn, n =  4)     # selecting n dedicated colors
usecol(pal = pal_unikn, n = 20)     # extending color palette  

# Mixing a new color palette: 
pal_1 <- usecol(pal = c(rev(pal_seeblau), "white", pal_pinky))  
seecol(pal_1)

# Mixing and extending a color palette: 
pal_2 <- usecol(pal = c(rev(pal_seegruen), "white", pal_bordeaux), n = 20)  
seecol(pal_2)

# Defining and using a custom color palette:
pal_princeton_1 <- c("#E77500", "white", "black")
names(pal_princeton_1) <- c("orange_w", "white", "black")

pal_3 <- usecol(pal_princeton_1, n = 7)
seecol(pal_3)
unikn

Graphical Elements of the University of Konstanz's Corporate Design

v0.4.0
CC BY-SA 4.0
Authors
Hansjoerg Neth [aut, cre] (<https://orcid.org/0000-0001-5427-3141>), Nico Gradwohl [aut] (<https://orcid.org/0000-0002-8703-905X>)
Initial release
2021-03-25

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