r - How to change secondary line axis color in ggplot2 -


in ggplot2, how can modify axis.line.y on sec.axis (if possible)?

    p <- ggplot(mtcars, aes(cyl, mpg)) +       geom_point()      # create simple secondary axis     p + scale_y_continuous(sec.axis = sec_axis(~.+10)) +       theme(axis.line.y = element_line(color = "red"),             # can modify text color not sure line?             axis.text.y.right = element_text(color = "red"))

enter image description here

update: shown in comments beloew, full control on right axis elements comprised in development version of ggplot2 theme( axis.line.y.right = element_line(color = "red"), axis.ticks.y.right = element_line(color = "red"))

maybe there straight solution hack/workaround can think of using geom_segment:

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

enter image description here


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