Dorlin cartograms
tm_shape(World, crs = "+proj=robin") +
tm_polygons() +
tm_cartogram_dorling(size = "pop_est", fill = "yellow")
#> Cartogram in progress...
We can the bubble fill color to show some other data, such as press freedom:
tm_shape(World, crs = "+proj=robin") +
tm_cartogram_dorling(size = "pop_est",
fill = "press",
fill.scale = tm_scale_continuous(values = "cols4all.pu_gn_div", midpoint = 50),
fill.legend = tm_legend("", height = 30)) +
tm_title("World Press Freedom Index")
View mode
These maps are also available interactively. As noted above the trick
in tmap is to disable basemaps. This can be done with
tm_basemap(NULL):
tmap_mode("view")
#> ℹ tmap mode set to "view".
tm_shape(World, crs = "+proj=robin") +
tm_cartogram_dorling(size = "pop_est",
fill = "press",
fill.scale = tm_scale_continuous(values = "cols4all.pu_gn_div", midpoint = 50),
fill.legend = tm_legend("", height = 30)) +
tm_title("World Press Freedom Index") +
tm_basemap(NULL)
#> [view mode] WebGL does not work (yet) with projected map projections, so it has
#> been disabled.
#> This message is displayed once per session.