colorscale

R6 api for chroma.js & an RStudio add-in to create a color scale from a single color.

Installation

Install development version from GitHub with:

remotes::install_github("dreamRs/colorscale")

RStudio add-in

An add-in to create a color palette from a single color (largely inspired by https://github.com/hihayk/scale).

To launch the gadget use the "Addins" menu in RStudio or:

colorscale::addin_color_scale()

chroma.js API

Create a R6 class to access chroma.js methods:

library(colorscale)

ch <- chroma$new("hotpink")
ch$darken(2)
ch$eval()
#> [1] "#930058"

hsl <- chroma$new()
hsl$chroma.hsl(330, 1, 0.6)
view_cols(hsl$eval())
hsl$darken(seq(0.2, 3, 0.2))
view_cols(hsl$eval())

Some methods have wrapper for easier use:

# Mixes two colors
chroma_mix(color1 = "red", color2 = "blue")
#> [1] "#800080"

# Average between colors
chroma_avg(colors = c("#ddd", "yellow", "red", "teal"))
#> [1] "#b79757"

# Random colors
chroma_random()
#> [1] "#650a0c"
chroma_random(10)
#> [1] "#63e24b" "#909363" "#5a3d7d" "#41a505" "#8f5f13" "#df6535" "#da43d3" "#04fc8f" "#6ee31c" "#ac5c94"

# Euclidean distance between two colors
chroma_distance("#fff", "#ff0")
#> [1] 96.94758
chroma_distance("#fff", "#ff0", "rgb")
#> [1] 255

Convert color to specific color space:

ch <- chroma$new("orange")
ch$hex()
#> [1] "#ffa500"
ch$rgb()
#> [1] 255 165   0
ch$hsl()
#> [1] 38.82353  1.00000  0.50000
ch$lab()
#> [1] 74.93565 23.93317 78.94978
ch$gl()
#> [1] 1.0000000 0.6470588 0.0000000 1.0000000
ch$css()
#> [1] "rgb(255,165,0)"