模拟 ggplot2 默认调色板 [英] Emulate ggplot2 default color palette

问题描述

我可以使用什么函数来模拟 ggplot2 的默认调色板以获得所需的颜色数.例如，输入 3 将生成具有以下颜色的 HEX 颜色字符向量:

What function can I use to emulate ggplot2's default color palette for a desired number of colors. For example, an input of 3 would produce a character vector of HEX colors with these colors:

推荐答案

它只是围绕色轮等距的色调，从 15 开始:

It is just equally spaced hues around the color wheel, starting from 15:

gg_color_hue <- function(n) {
  hues = seq(15, 375, length = n + 1)
  hcl(h = hues, l = 65, c = 100)[1:n]
}

例如:

n = 4
cols = gg_color_hue(n)

dev.new(width = 4, height = 4)
plot(1:n, pch = 16, cex = 2, col = cols)

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