I have encountered some unexpected behavior in the tmap
library and was wondering if there is a way around it. When producing a map with an expression in the legend title, the legend becomes too wide for some reason.
Here's some code to show what I mean:
library(tmap)
data("World")
# Produces normal legend window
tm_shape(World) +
tm_polygons("HPI") +
tm_layout(legend.bg.color = "#AAAAAA")
# Produces wide legend window
title <- expression(Local~G[i]^"*")
tm_shape(World) +
tm_polygons("HPI", title = title) +
tm_layout(legend.bg.color = "#AAAAAA")
I tried using the legend.width
parameter of tm_layout
, but that messes up the font and symbol size down the line. Any ideas how to fix this? Thanks!
It seems like tmap
just takes the unparsed length of your title as the legend.width
and since your expression width is substantial due to sub/superscripts, you end up with a very wide frame. I couldn't find a way to prevent tmap
from rescaling the text when legend.width
is used. One solution would be to just remove the background color. Not ideal, but takes care of the weird width issue.
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