n种颜色的渐变，范围从颜色1和颜色2 [英] Gradient of n colors ranging from color 1 and color 2

问题描述

我经常使用ggplot2来改善渐变效果​​(点击此处查看示例).我需要在基础上工作，我认为scales也可以在其中使用以创建颜色渐变，但是我对如何做到这一点很不满意.基本目标是生成n种颜色的调色板，范围从x颜色到y颜色.该解决方案需要在基础上工作.这是一个起点，但没有输入n的位置.

I often work with ggplot2 that makes gradients nice (click here for an example). I have a need to work in base and I think scales can be used there to create color gradients as well but I'm severely off the mark on how. The basic goal is generate a palette of n colors that ranges from x color to y color. The solution needs to work in base though. This was a starting point but there's no place to input an n.

 scale_colour_gradientn(colours=c("red", "blue"))

我很清楚:

brewer.pal(8, "Spectral") 

来自RColorBrewer的

.我正在寻找更多类似于ggplot2处理渐变的方法，该方法表示我有这两种颜色，并且一路上需要15种颜色.我该怎么办?

from RColorBrewer. I'm looking more for the approach similar to how ggplot2 handles gradients that says I have these two colors and I want 15 colors along the way. How can I do that?

推荐答案

colorRampPalette在这里可能是您的朋友:

colorRampPalette could be your friend here:

colfunc <- colorRampPalette(c("black", "white"))
colfunc(10)
# [1] "#000000" "#1C1C1C" "#383838" "#555555" "#717171" "#8D8D8D" "#AAAAAA"
# [8] "#C6C6C6" "#E2E2E2" "#FFFFFF"

并且为了展示它的工作原理:

And just to show it works:

plot(rep(1,10),col=colfunc(10),pch=19,cex=3)

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