更改辅助线轴颜色 [英] Change secondary line axis color

问题描述

在ggplot2中，如何仅在sec.axis上修改axis.line.y(如果可能)?

In ggplot2, how can I modify axis.line.y only on the sec.axis (if possible)?

    p <- ggplot(mtcars, aes(cyl, mpg)) +
      geom_point()

    # Create a simple secondary axis
    p + scale_y_continuous(sec.axis = sec_axis(~.+10)) +
      theme(axis.line.y = element_line(color = "red"),
            # I can modify text color but not sure about line?
            axis.text.y.right = element_text(color = "red"))

如下面的注释所示， ggplot2 theme( axis.line.y.right = element_line(color = "red"), axis.ticks.y.right = element_line(color = "red"))

As shown in comments below, full control over right axis elements is now comprised in the development version of ggplot2 theme( axis.line.y.right = element_line(color = "red"), axis.ticks.y.right = element_line(color = "red"))

推荐答案

更新:

感谢评论在下面，可以通过使用;

Update:

Thanks to the comment below, this can be done by using latest dev.v of ggplot2;

install.packages("devtools")
devtools::install_github("tidyverse/ggplot2")
library(ggplot2)

p + theme( axis.line.y.right = element_line(color = "red"), 
       axis.ticks.y.right = element_line(color = "red"))

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也许有一个直接的解决方案，但这是我可以想到的使用geom_segment的一种hack/解决方法:

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Maybe there is a straight solution but this is a hack/workaround that I can think of using geom_segment:

p <- ggplot(mtcars, aes(cyl, mpg)) +
     geom_point()

#get the ylim and xlim
xmin <- min(ggplot_build(p)$layout$panel_ranges[[1]]$x.range) 
xmax <- max(ggplot_build(p)$layout$panel_ranges[[1]]$x.range)
ymin <- min(ggplot_build(p)$layout$panel_ranges[[1]]$y.range)
ymax <- max(ggplot_build(p)$layout$panel_ranges[[1]]$y.range)

# Create a simple secondary axis
p + scale_y_continuous(sec.axis = sec_axis(~.+10)) +
    theme(axis.text.y.right = element_text(color = "red"))+
    geom_segment(aes(x=xmax+0.2,xend=xmax+0.2,
                     y=ymin-2,yend=ymax+2), color = "red") +
    coord_cartesian(xlim=c(xmin, xmax), ylim=c(ymin, ymax))

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