Reversing color palettes

[hagertynw]

In tmap v4, it would be very helpful to be able to reverse the values of a color palette. I thought it could be done with a negative sign in front of the palette name, but it doesn't seem to work. These two lines produce identical maps for me:

tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "br_bg"))
tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "-br_bg"))

I couldn't find another argument in the documentation that would accomplish this. If there is another way to do it that I missed please let me know. Thanks!

[Rapsodia86]

Which version do you have? Mine is on Win10:

> packageVersion("tmap")
[1] ‘3.99.9002’

and it works for me: tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "br_bg")) tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "-br_bg"))

[hagertynw]

> packageVersion("tmap")
[1] ‘3.99.9003’

on Win10 Enterprise.

Do you know how to install an earlier version from Github?

[ar-puuk]

This should do that:

remotes::install_github("r-tmap/tmap@4b394a317de56c2c4605379cd958954246cb5860")

[hagertynw]

Thank you. I used that link to install tmap 3.99.9002, updated all package dependencies, and started a new session in which I loaded nothing besides tmap. It still doesn't work. Both lines of code above produce the first map, in which Russia is teal. I also tried tmap_save in case it was an issue with the RStudio viewer, and the output images are also identical.

In view mode I get this error message, in case it is a clue. I don't think I understand enough of how the color values are generated to interpret it. Appreciate the help.

> ttm()
ℹ tmap mode set to "view".
> tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "-br_bg"))
Registered S3 method overwritten by 'jsonlite':
  method     from   
  print.json jsonify
Warning message:
In checkDim(x, data) :
  Length of color vector does not match number of data rows.
  The vector is repeated to match the number of rows.
> tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "br_bg"))
Warning message:
In checkDim(x, data) :
  Length of color vector does not match number of data rows.
  The vector is repeated to match the number of rows.

[ar-puuk]

I am sorry, I am not skilled enough to fix the issue. But I checked and found that a commit seems to have broken it.

This should fix your issue for now.

## install the working version of the tmap package
# remotes::install_github("r-tmap/tmap@05bd6c605123cbc773cc09a86b39d60540f51163") # does not work
remotes::install_github("r-tmap/tmap@4b754be3143bbe0819920e28a3bfb227713638f8") # works

library(tmap)
#> 
#> Attaching package: 'tmap'
#> The following object is masked from 'package:datasets':
#> 
#>     rivers

packageVersion("tmap")
#> [1] '3.99.9002'

tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "br_bg"))
#> Multiple palettes called "br_bg" found: "brewer.br_bg", "matplotlib.br_bg". The first one, "brewer.br_bg", is returned.

tm_shape(World) + tm_polygons(fill = "area", fill.scale = tm_scale(values = "-br_bg"))
#> Multiple palettes called "br_bg" found: "brewer.br_bg", "matplotlib.br_bg". The first one, "brewer.br_bg", is returned.

^{Created on 2024-11-12 with reprex v2.1.1}

Session info

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[hagertynw]

Thank you! That solved my immediate problem.

[mtennekes]

Thx for this bug report @hagertynw Now fixed in the latest dev version.