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Allow to reverse the order of colours in a brewer palette #924

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Allow to reverse the order of colours in a brewer palette #924

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3b04275
Allow to reverse the order of colours in a brewer palette
jiho May 16, 2013
ca3f12e
Make scale_*_distiller work with the direction argument
jiho Mar 21, 2014
d7069c1
Add documentation for the direction argument
jiho Mar 21, 2014
5534a5c
Add NEWS bit
jiho Mar 21, 2014
cb4bb17
Add PR number of NEWS bit for brewer scales direction
jiho Mar 21, 2014
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5 changes: 5 additions & 0 deletions NEWS
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Original file line number Diff line number Diff line change
@@ -1,5 +1,10 @@
ggplot2 0.9.3.1.99
----------------------------------------------------------------

* Add a `direction` argument to brewer scales to be able to reverse the order of
colours. In many diverging scales, the warm colours get associated with lowest
values in an ordered factor. (@jiho, #924)

* `stat_ellipse()` adds data ellipses. It supports bivariate normal and t distributions,
as well as a euclidian distance circle. (@jofrhwld, #926)

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21 changes: 12 additions & 9 deletions R/scale-brewer.r
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Expand Up @@ -33,6 +33,9 @@
#' d + scale_colour_brewer(palette = "Blues")
#' d + scale_colour_brewer(palette = "Set1")
#'
#' # The order of colours in the palette can be swapped
#' d + scale_colour_brewer(palette = "Blues", direction = -1)
#'
#' # scale_fill_brewer works just the same as
#' # scale_colour_brewer but for fill colours
#' ggplot(diamonds, aes(x = price, fill = cut)) +
Expand All @@ -51,41 +54,41 @@
#' v + scale_fill_distiller(palette = 2)
#' v + scale_fill_distiller(type = "div")
#' v + scale_fill_distiller(palette = "Spectral")
#' v + scale_fill_distiller(palette = "Spectral", trans = "reverse")
#' v + scale_fill_distiller(palette = "Spectral", direction = -1)
#' v + scale_fill_distiller(type = "qual")
#' # Not appropriate for continuous data, issues a warning
scale_colour_brewer <- function(..., type = "seq", palette = 1) {
discrete_scale("colour", "brewer", brewer_pal(type, palette), ...)
scale_colour_brewer <- function(..., type = "seq", palette = 1, direction = 1) {
discrete_scale("colour", "brewer", brewer_pal(type, palette, direction), ...)
}

#' @export
#' @rdname scale_brewer
scale_fill_brewer <- function(..., type = "seq", palette = 1) {
discrete_scale("fill", "brewer", brewer_pal(type, palette), ...)
scale_fill_brewer <- function(..., type = "seq", palette = 1, direction = 1) {
discrete_scale("fill", "brewer", brewer_pal(type, palette, direction), ...)
}

#' @export
#' @rdname scale_brewer
scale_colour_distiller <- function(..., type = "seq", palette = 1, values = NULL, space = "Lab", na.value = "grey50") {
scale_colour_distiller <- function(..., type = "seq", palette = 1, direction = -1, values = NULL, space = "Lab", na.value = "grey50") {
# warn about using a qualitative brewer palette to generate the gradient
type <- match.arg(type, c("seq", "div", "qual"))
if (type == "qual") {
warning("Using a discrete colour palette in a continuous scale.\n Consider using type = \"seq\" or type = \"div\" instead", call. = FALSE)
}
continuous_scale("colour", "distiller",
gradient_n_pal(brewer_pal(type, palette)(6), values, space), na.value = na.value, ...)
gradient_n_pal(brewer_pal(type, palette, direction)(6), values, space), na.value = na.value, ...)
# NB: 6 colours per palette gives nice gradients; more results in more saturated colours which do not look as good
}

#' @export
#' @rdname scale_brewer
scale_fill_distiller <- function(..., type = "seq", palette = 1, values = NULL, space = "Lab", na.value = "grey50") {
scale_fill_distiller <- function(..., type = "seq", palette = 1, direction = 1, values = NULL, space = "Lab", na.value = "grey50") {
type <- match.arg(type, c("seq", "div", "qual"))
if (type == "qual") {
warning("Using a discrete colour palette in a continuous scale.\n Consider using type = \"seq\" or type = \"div\" instead", call. = FALSE)
}
continuous_scale("fill", "distiller",
gradient_n_pal(brewer_pal(type, palette)(6), values, space), na.value = na.value, ...)
gradient_n_pal(brewer_pal(type, palette, direction)(6), values, space), na.value = na.value, ...)
}

# icon.brewer <- function() {
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4 changes: 2 additions & 2 deletions man/scale_brewer.Rd
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Expand Up @@ -8,9 +8,9 @@
\alias{scale_fill_distiller}
\title{Sequential, diverging and qualitative colour scales from colorbrewer.org}
\usage{
scale_colour_brewer(..., type = "seq", palette = 1)
scale_colour_brewer(..., type = "seq", palette = 1, direction = 1)

scale_fill_brewer(..., type = "seq", palette = 1)
scale_fill_brewer(..., type = "seq", palette = 1, direction = 1)

scale_colour_distiller(..., type = "seq", palette = 1, values = NULL,
space = "Lab", na.value = "grey50")
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