c4a_options: Set cols4all options

In cols4all: Colors for all

Set cols4all options

Description

Get or set global options for c4a. Works similar as the base function options

Usage

c4a_options(...)

Arguments

...	Use character values to retrieve options. To set options, either use named arguments (where the names refer to the options), a list that consists of those options.

Details

Option	Description
defaults	Default palettes per type
CBF_th	Parameters that label a palette as color blind friendly
CBVF_th	Parameters that label a palette as very color blind friendly
CBU_th	Parameters that label a palette as color blind unfriendly
CrangeFair	Maximum chroma range for which a palette is considered harmonic
CrangeUnfair	Minimum chroma range for which a palette is considered disharmonic
LrangeFair	Maximum luminance range for which a palette is considered harmonic
LrangeUnfair	Minimum luminance range for which a palette is considered disharmonic
Cintense	Chroma of colors that are considered intense
Cpastel	Chroma of colors that are considered 'pastel'
HwidthDivRainbow	A diverging palette is labeled as 'rainbow hue' if HwidthL or HwidthR are at least HwidthDivRainbow
HwidthDivSingle	A diverging palette is labeled as 'single hue' if HwidthL and HwidthR are at most HwidthDivSingle
HwidthSeqRainbow	A sequential palette is labeled as 'rainbow hue' if Hwidth is at least HwidthSeqRainbow
HwidthSeqSingle	A sequential palette is labeled as 'single hue' if Hwidth is at most HwidthSeqSingle
naming_fun	Function that returns a distance matrix with the naming_colors (see examples)
naming_fun_args	List of arguments for naming_fun
naming_colors	Vector of prototype colors for the color names (see examples)
naming_softmax	List of parameters for the softmax function applied to the distance matrix

Value

A list of options

Examples

# Example how to lower the color-blind friendly threshold
# for categorical palettes (so more smileys in the GUI!)
# CBF_th: one smiley
# CBVF_th: two smileys

# current table
## Not run: 
c4a_table(n = 9, sort = "cbfriendly")

opts = c4a_options("CBF_th", "CBVF_th")
opts$CBF_th$cat["min_dist"] = 7
opts$CBVF_th$cat["min_dist"] = 10


old = c4a_options(opts)

# more smileys :-) :-)
c4a_table(n = 9, sort = "cbfriendly")

# set the old settings back
c4a_options(old)

## End(Not run)

# Example how to use own nameability function
#
# This function should:
# - have an argument "pal" (vector of colors)
# - optionally have other arguments
# - return a distance matrix of n rows (length of pal) and k columns (classes).
#   It shoud have columns names that correspond to the naming colors (see below).
naming_RGB = function(pal) {
	cols = colorspace::hex2RGB(pal)
	coords = cols@coords

	cls = apply(coords, MARGIN = 1, which.max)
	mx = apply(coords, MARGIN = 1, max)
	dominance = ((mx + 0.001) / (rowSums(coords) + 0.001))
	cls[dominance < 0.4] = 4L

	m = matrix(0, nrow = length(pal), ncol = 4,
        dimnames = list(NULL, c("Red", "Green", "Blue", "Other")))
	for (i in 1:nrow(m)) {
		m[i, cls[i]] = 1
	}

	-m
}

# testing this function...
naming_RGB(c4a("brewer.set1")) #fair enough

# This vector should contain the 'prototype' colors, and have names that correspond
# to the column names of the returned matrices by the function above.
names_RGB =
    c("Red" = "#FF0000",
      "Green" = "#00FF00",
      "Blue" = "#0000FF",
      "Other" = "#AAAAAA")

# Set the options (may take a while because if calculated the nameability scores)
## Not run: 
c4a_options(naming_fun = naming_RGB,
			naming_fun_args = list(),
			naming_colors = names_RGB)

## End(Not run)

cols4all documentation built on Oct. 17, 2024, 1:07 a.m.