如何在ggplot2中访问由geo_text绘制的标签的尺寸?

问题描述

据我所知ggplot2 知道 geom_text绘制的标签尺寸.否则check_overlap选项将不起作用.

As far as I can see ggplot2 knows the dimensions of labels plotted by geom_text. Otherwise the check_overlap option would not work.

这些尺寸存储在哪里，如何访问它们?

Where are these dimensions stored and how can I access them?

说明性例子

library(ggplot2)
df <- data.frame(x = c(1, 2),
                 y = c(1, 1),
                 label = c("label-one-that-might-overlap-another-label",
                           "label-two-that-might-overlap-another-label"),
                 stringsAsFactors = FALSE)

使用check_overlap = FALSE(默认设置)时，标签会相互重叠.

With check_overlap = FALSE (the default), the labels overplot each other.

ggplot(df, aes(x, y)) +
  geom_text(aes(label = label)) +
  xlim(0, 3)

对于check_overlap = TRUE，不会绘制第二个标签，因为ggplot发现重叠.

With check_overlap = TRUE, the second label is not plotted, because ggplot finds an overlap.

ggplot(df, aes(x, y)) +
  geom_text(aes(label = label), check_overlap = TRUE) +
  xlim(0, 3)

ggplot2如何知道这些标签重叠?我如何访问该信息?

How does ggplot2 know that those labels overlap? How can I access that information?

推荐答案

如果您只是想避免标签重叠，则ggrepel软件包的效果很好.

If you are just looking to avoid overlapping labels, the ggrepel package works pretty well.

library(ggplot2)
library(ggrepel)
df <- data.frame(x = c(1, 2),
                 y = c(1, 1),
                 label = c("label-one-that-might-overlap-another-label",
                           "label-two-that-might-overlap-another-label"),
                 stringsAsFactors = FALSE)
ggplot(df, aes(x, y)) +
  geom_text_repel(aes(label = label), check_overlap = F) +
  xlim(0, 3)

上面的代码产生下图.

The above code produces the graph below.

这篇关于如何在ggplot2中访问由geo_text绘制的标签的尺寸?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！