在 tmap 中对齐图例标题

Question

Is it possible to center the legend title in tmap ? Utilizing the first example from the tmap getting started vignette :

library(tmap)
data("World")

tm_shape(World) +
  tm_polygons("HPI") 

yields

but I want:

I have scoured the documentation for tm_layout but can't figure out how to align the text of the legend title. It seems that the only options for legend.title in tm_layout are (1) legend.title.color , (2) legend.title.size , (3) legend.title.fontface , and (4) legend.title.fontfamily , none of which control the alignment. Am I missing something obvious?

Answer 1

Well... aparently there is not an argument to control the location of the legend title, have you considered report this as an issue?

A workaround though could be:

library(tmap)
data("World")

tm_shape(World) +
  tm_polygons("HPI", 
              title = "     HPI")

Yes, I know how ugly this looks, but it gets you the result.