ggplot2，顶部和边缘的传说 [英] ggplot2, legend on top and margin

问题描述

Consider the following:

library(ggplot2)
library(grid)
ggplot(diamonds, aes(clarity, fill=cut)) + 
  geom_bar() +   
  theme(
    plot.margin=unit(x=c(0,0,0,0),units="mm"),
    legend.position="top",
    plot.background=element_rect(fill="red")) +
  guides(fill=guide_legend(title.position="top"))

输出如下所示：

在 plot.margin = unit（x = c（0， 0,0,0），units =mm）图例上方有一个不合适的白色（红色）空间。有谁知道如何补救？

The output of that looks something like this: In the context of plot.margin=unit(x=c(0,0,0,0),units="mm") there's an unseemly amount of white (red) space above the legend. Does anyone know how to remedy that?

感谢您的任何提示。

诚挚的，Joh

推荐答案

像你说的，我看不出你的例子，但我猜测margin是传说本身。您可以通过添加

Like you said, I can't see it in your example, but I'm guessing the margin is of the legend itself. You can eliminate the margin around the legend itself by adding

theme(legend.margin=unit(-0.6,"cm")) # version 0.9.x

到您的ggplot数字代码。

to your ggplot figure code.

更新：从版本2.1.0开始，语法已更改，您应该使用

UPDATE: As of version 2.1.0, the syntax has changed such that you should use

theme(legend.margin=margin(t = 0, unit='cm'))

请注意，至少现在，旧的解决方案仍然有效。

Note that, at least for now, the old solution still works as well.

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