我们可以在R（ggplot2）中的虚线上添加阴影吗？ [英] Can we add shadows to (dashed) lines in R (ggplot2)?

问题描述

我被要求在R中的虚线上添加阴影。它类似于我在网上找到的这张图片，不同的是它是用于非实线的：

b

我没有为此目的找到任何特定的控件/包。如果这是一条我需要阴影的实线，那么我会使用另一条具有不同不透明度和厚度的线来模拟阴影。但是对于非实线（虚线，点线等）来说，这种解决方法似乎行不通，因为当您更改厚度时，它们的间隙将不匹配。

有任何想法吗？

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图片是从

I was asked to add shadows to a dashed-line in R. It would be similar to this image I found on-line, except it is for non-solid lines:

I did not find any specific control/package for this purpose. If it was a solid line that I needed a shadow for, I would have simulated the shadow using another line with different opacity and thickness. But it seems for the non-solid lines (dashed, dotted, etc) this workaround won't work, since their gaps won't match as you change the thickness.

Any ideas?

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Image is copied from here only for the sake of clarity.

解决方案

You can only tweak this like

df <- data.frame(x = 1:20, y = cumsum(rnorm(20)))
ggplot(df, aes(x = x, y = y)) +
  geom_line(aes(x = x+0.15, y = y-0.15), alpha = 0.2, lwd = 1.2, linetype = 2) +
  geom_point(aes(x = x+0.15, y = y-0.15), alpha = 0.1, size = 2.5) +
  geom_line(lwd = 1, linetype = 2) + 
  geom_point(size = 2.5) +
  theme_bw()

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