垂直调整标题到剧情内 - vjust不工作 [英] Adjust title vertically to inside the plot - vjust not working

问题描述

我想将标题放置在绘图中而不是默认的顶部位置。
这里是一个简单的代码片段

  library（ggplot2）
 df<  -  data.frame x = c（1:10），y = rnorm（10,1,2））
 ggplot（df，aes（x，y））+ 
 geom_line（）+ 
 ggtitle Demo）+ 
 theme（plot.title = element_text（vjust = -3））
  

<过去，我可以通过改变 vjust 的值来实现这一点，但现在它无法工作。任何想法如何做到这一点？

解决方案

在

请参阅？margin 获取更多参数。

---

请注意，您应该为 axis.title.x 和 axis.title.y使用 margin 参数以及：

  ggplot（）+ ggtitle（this is title）+ xlab（这是x）+ ylab（this is y）+ 
 theme（plot.title = element_text（margin = margin（b = -10）），
 axis.title.x = element_text（保证金=保证金（t = -10）），
 axis.title.y = element_text（保证金=保证金（r = -10）））
  

I want to place the title inside the plot instead at the default top position. Here is a simple code snippet

library(ggplot2)
df <- data.frame(x = c(1:10), y = rnorm(10, 1, 2))
ggplot(df, aes(x, y))+
   geom_line() +
   ggtitle("Demo") + 
   theme(plot.title = element_text(vjust = -3)) 

In the past I was able to do this by varying vjust value, but now it is not working. Any idea how to do this?

解决方案

In the ggplot issue "vjust not working in v 2.0 for plot.title?", Hadley writes:

"All text elements now have a margin, which by default scale with the font size in the theme. This leads to nicer spacing, particularly at large font sizes. This means hacks with vjust and hjust no longer work. Instead, use the margin() parameter of element_text()"

Play around with the t and b arguments in margin to adjust the title, e.g.:

ggplot(df, aes(x, y))+
  geom_line() +
  ggtitle("Demo") + 
    theme(plot.title = element_text(margin = margin(t = 10, b = -20)))

See ?margin for further arguments.

---

Note that you should use the margin argument for axis.title.x and axis.title.y as well:

ggplot() + ggtitle("this is title") + xlab("this is x") + ylab("this is y") + 
  theme(plot.title = element_text(margin = margin(b = -10)),
        axis.title.x = element_text(margin = margin(t = -10)),
        axis.title.y = element_text(margin = margin(r = -10)))

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