get_asp_ratio ignores outside map components #39
Description
Is it intentional that get_asp_ratio calculates the ratio based only on the map region, and ignores legends, facet titles, map titles, etc. that are placed outside? Is it possible to include those components in the calculation of aspect ratio?
Consider the following examples:
library(tmap)
data(land, World)
p <- tm_shape(land) + tm_raster("cover") + tm_layout(outer.bg.color = "mistyrose")
asp <- tmaptools::get_asp_ratio(p) # asp = 2With the calculated aspect ratio of 2:1, there is excessive white space around the map.
tmap_save(p, filename = "test.png", width = 8, height = 8/asp, dpi = 300)With the legend suppressed, the aspect ratio of 2:1 is perfect.
tmap_save(
p + tm_layout(legend.show = FALSE),
filename = "test-noLegend.png", width = 8, height = 8/asp, dpi = 300
)We can use asp = 0 to stretch the map frame out to the edges of the image, but this causes excessive margins within the map frame, and leads to a suboptimal legend layout.
tmap_save(p, filename = "test-asp0.png", width = 8, height = 8/asp, dpi = 300, asp=0)Session Info
sessioninfo::session_info()
─ Session info ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
setting value
version R version 4.4.1 (2024-06-14)
os macOS Sonoma 14.7.4
system x86_64, darwin20
ui X11
language (EN)
collate en_US.UTF-8
ctype en_US.UTF-8
date 2025-03-21
pandoc 3.6.2 @ /usr/local/bin/pandoc
─ Packages ────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────
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[1] /Users/me/Library/R/x86_64/4.4/library
[2] /Library/Frameworks/R.framework/Versions/4.4-x86_64/Resources/library