I have a tmap plot with two layers, a tm_polygon and a tm_borders. A minimal example would be
library(tmap)
library(sf)
library(tidyverse)
data("World")
continents <- World %>%
group_by(continent) %>%
summarise()
tm_shape(World) +
tm_polygons(col = "economy") +
tm_shape(continents) +
tm_borders(col = "red")
To the legend that is automatically created (explaining the fill colors of the first layer) I would like to add a field indicating what the red borders from the second layer stand for (e.g. using a white square with a red border and an appropriate label).
Is there any way to achieve this? Specifying the fill/border colors manually would be sufficient in my case because the number of legend items is small.
