在ggplot2中旋转图例

Question

我希望将ggplot2图例旋转90°

这

qplot(mpg, wt, data=mtcars, colour=cyl)

生产

Answer 1

类似的东西：

p <- qplot(mpg, wt, data=mtcars, colour=cyl)
p + scale_colour_continuous(guide = guide_legend(direction = "horizontal", title.position = "top",
                             label.position="bottom", label.hjust = 0.5, label.vjust = 0.5,
                             label.theme = element_text(angle = 90))) + 
      theme(legend.position = c(0.5, 0.9))

参考：ggplot docs

Answer 2

你可以试试这个

library(ggplot2)
qplot(mpg, wt, data=mtcars, colour=cyl) + theme(legend.position = "top")

Answer 3

要完全正确，我认为您需要在label.theme中使用title.theme以及guide_legend。我认为使用title.position = "left"会更好。

（复制粘贴先前解决方案的部分）

library(ggplot2)
qplot(mpg, wt, data=mtcars, colour=cyl) +
    scale_colour_continuous(guide = guide_legend(direction = "horizontal", title.position = "left", title.theme = element_text(angle = 90),
                             label.position="bottom", label.hjust = 0.5, label.vjust = 0.5,
                             label.theme = element_text(angle = 90))) + 
      theme(legend.position = c(0.5, 0.9))