tmap_grob creates an empty plot

[Nowosad]

tmap_grob() opens a new graphic device, which creates an empty plot (both in RStudio, but also in other sessions; see reprex below). It is a minor inconvenience, but hopefully it could be easily fixed.

library(tmap)
data(World)

tm1 = tm_shape(World) + tm_polygons("well_being", 
                                    title = "Well-being",
                                    palette = "RdYlGn")

tm1_grob = tmap_grob(tm1)
#> Note that the aspect ratio for which the grob has been generated is 1.4

^{Created on 2021-01-23 by the reprex package (v0.3.0)}

[mtennekes]

Yes, I am aware of it. I already found a way how to solve it, which will be applied in v4. If it isn't too much effort I'll fix it in v3 as well, but it has low priority.

[FelipeCarrillo]

Is this the same issue as below ?:

tmap_mode("view")
qtm(World)

The map gets displayed on my browser but an R empty device gets invoked as well.

[olivroy]

@mtennekes , another failure in Spatial Data Science with R was the absence of tmap_grob(), do you plan to add it back for tmap v4?

pol_pres15$sps1 <- sps[,mr]
tm1 <- tm_shape(pol_pres15) +
          tm_fill("sps1", title = "Shortest path\ncount")
coords[mr] |> 
    st_distance(coords) |> 
    c() |> 
    (function(x) x/1000)() |> 
    units::set_units(NULL) -> pol_pres15$dist_52
library(ggplot2)
g1 <- ggplot(pol_pres15, aes(x = sps1, y = dist_52)) +
        geom_point() +
        xlab("Shortest path count") +
        ylab("km distance")
gridExtra::grid.arrange(tmap_grob(tm1), g1, nrow=1)

This is in Chapter 14 https://r-spatial.org/book/14-Areal.html#fig-shortestpath