对齐水平ggplot条形图的标题，字幕和标题 [英] Aligning title, subtitle and caption for horizontal ggplot barchart

问题描述

我想在水平ggplot2条形图中左对齐plot.title，plot.subtitle和plot.caption.

I would like to left align the plot.title, plot.subtitle and plot.caption in a horizontal ggplot2 barchart.

示例:

library("ggplot2") # ggplot2 2.2
df <- data.frame(type=factor(c("Brooklyn",
                               "Manhatten and\n Queens")),
                 value=c(15,30))

# manual hjust for title, subtitle & caption
myhjust <- -0.2

ggplot(df,
       aes(x=type, y=value)) +
  geom_bar(stat='identity') +
  coord_flip() +
  labs(
    title = "This is a nice title",
    subtitle = "A subtitle",
    caption  = "We even have a caption. A very long one indeed.") +
  theme(axis.title=element_blank(),
        plot.title=element_text(hjust = myhjust),
        plot.subtitle=element_text(hjust = myhjust ),
        plot.caption=element_text(hjust = myhjust))

如何将所有3个labs元素(plot.title，plot.subtitle和plot.caption)对齐到axis.text的起始位置(红色垂直线，Manhatten的"M")?

How can I align all 3 labs elements (plot.title, plot.subtitle and plot.caption) to where the axis.text starts (red vertical line, "M" of Manhatten)?

此外:为什么固定的myhjust会导致plot.title，plot.subtitle和plot.caption的3个不同的水平位置?

Besides: Why does a fixed myhjust result in 3 different horizontal positions for plot.title, plot.subtitle and plot.caption?

推荐答案

此问题涉及github tidyverse/ggplot2解决的问题: https://github.com/tidyverse/ggplot2/issues/3252

This question refers to this github tidyverse/ggplot2 solved issue: https://github.com/tidyverse/ggplot2/issues/3252

它在ggplot2(开发版本)中实现: https://github .com/tidyverse/ggplot2/blob/15263f7580d6b5100989f7c1da5d2f5255e480f9/NEWS.md

And it is implemented in ggplot2 (development version): https://github.com/tidyverse/ggplot2/blob/15263f7580d6b5100989f7c1da5d2f5255e480f9/NEWS.md

主题获得了两个新参数plot.title.position和plot.caption.position，可用于自定义情节标题/字幕和情节标题相对于整个情节的位置(@ clauswilke，#3252)

Themes have gained two new parameters, plot.title.position and plot.caption.position, that can be used to customize how plot title/subtitle and plot caption are positioned relative to the overall plot (@clauswilke, #3252).

以您的示例作为代表:

# First install the development version from GitHub:
#install.packages("devtools") #If required
#devtools::install_github("tidyverse/ggplot2")

library(ggplot2)
packageVersion("ggplot2")
#> [1] '3.2.1.9000'

df <- data.frame(type=factor(c("Brooklyn","Manhatten and\n Queens")),
                 value=c(15,30))

ggplot(df, aes(x=type, y=value)) +
  geom_bar(stat='identity') +
  coord_flip() +
  labs(title = "This is a nice title",
       subtitle = "A subtitle",
       caption  = "We even have a caption. A very long one indeed.") +
  theme(plot.caption = element_text(hjust = 0, face= "italic"), #Default is hjust=1
        plot.title.position = "plot", #NEW parameter. Apply for subtitle too.
        plot.caption.position =  "plot") #NEW parameter

^{由 reprex软件包(v0.3.0)}

^{Created on 2019-09-04 by the reprex package (v0.3.0)}

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