rainbowHCL: HCL rainbow palette

In AkselA/R-ymse: Ymse (Various)

Description

HCL version of rainbow. Create a vector of n contiguous colours by specifying a range of Hues, and fixed Chroma and Luminance

Usage

rainbowHCL(n, c = 100, l = 75, start = 0, end = max(1, n - 1)/n,
  alpha = 1, s = NULL, v = NULL)

Arguments

n	number of colours
c, l	the ‘chroma’ and ‘luminance’ to be used to complete the HSV color descriptions
start, end	the hue in [0,1] at which the rainbow begins/ends
alpha	the alpha transparency, a number in [0,1], see argument alpha in hsv
s, v	'saturation' and 'value' passed to adjustcolorHSV. Overrides 'chroma' and 'luminance' if specified.

Examples

mat2grid <- function(x) {
	eg <- expand.grid(1:NCOL(x), NROW(x):1)
	gd <- data.frame(eg, c(t(x)), stringsAsFactors=FALSE)
	colnames(gd) <- c("x", "y", "z")
	gd
}

n <- 25
hcl0 <- rainbowHCL(n)
hcl1 <- rainbowHCL(n, c=150, l=85)
hcl2 <- rainbowHCL(n, s=1, v=1)
hsv0 <- rainbow(n)

cols <- rbind(hcl0, hcl1, hcl2, hsv0)

pos <- mat2grid(cols)
plot(pos[,1:2], pch=17, cex=3.5, col=pos[,3], ylim=c(0.5, 4.5))

AkselA/R-ymse documentation built on March 21, 2020, 9:52 a.m.