Document guide_colourbar() ticks behaviour (#6660)

* document tick behaviour

* include different ticks in pre-existing test

Author: teunbrand

R/guide-colorbar.R

@@ -45,6 +45,10 @@ NULL
 #' @param available_aes A vector of character strings listing the aesthetics
 #'   for which a colourbar can be drawn.
 #' @param ... ignored.
+#' @details
+#' The `legend.ticks.length` theme option can be set to a length 2 unit to
+#' control ticks at the right/bottom and left/top sides independently.
+#'
 #' @return A guide object
 #' @export
 #' @family guides

man/guide_colourbar.Rd

@@ -78,7 +78,7 @@ test_that("colorbar can be styled", {
         theme = theme(
           legend.frame = element_rect(colour = "green", linewidth = 1.5 / .pt),
           legend.ticks = element_line("black", linewidth = 2.5 / .pt),
-          legend.ticks.length = unit(0.4, "npc")
+          legend.ticks.length = unit(c(0.2, 0.4), "npc")
         ), alpha = 0.75
       )
     ) + labs(subtitle = "white-to-red semitransparent colorbar, long thick black ticks, green frame")