Allow to reverse the order of colours in a brewer palette

[jiho]

Use the same argument that scale_*_hue uses: direction

[jiho]

I kept the pull-request separated but I am not sure how this one will interact with #925. Please pull the other first, because it is larger. I will rebase this one if necessary.

[jiho]

The CI fails because it requires an updated version of scales which has the direction argument in brewer_pal

[jiho]

NB: an example in #925 uses this functionality. It won't fail but the output would be the same. This does not have to be pulled first but it would be best to pull the two together.

[jiho]

EDIT later today: actually it's using trans = "reverse", not direction so it's fine. Still the two are touching the same file and will surely conflict. Pull one and I'll rebase the other afterwards. This one is simpler so I would pull #925 first and I'll rebase this one afterwards (I'll probably alter the example to use direction too).

[jiho]

Rebased on master and acknowledge the existence of scale_*_distiller now. Should be ready to pull (but the corresponding PR in scales r-lib/scales#36 should be pulled simultaneously).

[jiho]

Forgot the NEWS, now it's ready to be pulled ;)

[hadley]

I might keep this on the shelf for now, because I'd rather not have to also release scales.

[jiho]

Any chance of including this here and in scales, now that a new version of ggplot2 is out, so that it would make it with the next version of ggplot2 + scales? Most diverging palettes of colorbrewer as useless without it because they associate warm colours to low numbers.

Thanks in advance.

[hadley]

Can you please merge/rebase? If it still needs the dev version of scales, can you please update the DESCRIPTION?

[jiho]

Ideally, I would need you to pull #1076 first. Then I'll rebase (or more probably just completely rewrite) this on top of it. The changes in scales are minimal (r-lib/scales#36) but should be released in order for this to not depend on a dev version of scales, which is probably unsuitable.

Do you plan on releasing scales also?

[hadley]

I'm planning on releasing scales tomorrow.

[hadley]

Can you please finish this off now that scales is out? You'll need to add an explicit version requirement in the DESCRIPTION

[jiho]

#1139 replaces this one (much simpler thanks to the change in scales and branches from a recent master)

[lock]

This old issue has been automatically locked. If you believe you have found a related problem, please file a new issue (with reprex) and link to this issue. https://reprex.tidyverse.org/