[R-sig-Geo] layout and plot.stars

[Roger Bivand]

On Tue, 15 Mar 2022, Patrick Giraudoux wrote:

> Hi,
>
> I have a trouble with the combination of layout and plot.stars. e.g.
>
> nf <- layout(matrix(c(1,2),2,1,byrow = TRUE), c(3,3), c(3,1), TRUE)
> layout.show(nf)
>
> plot(st_geometry(mydept),col="grey",border="grey90")
> plot(st_rasterize(ztot),col=mypal(12),main="",breaks="equal",add=TRUE)

You have already noticed that sf and stars, like raster and terra, modify 
the assumptions of base plot methods, as graphics::filled.contour(), 
unless some ordering and argument conditions are met, crucially the 
non-base reset= argument. I do not think that you can use layout() at all.

library(stars)
nc <- st_read(system.file("gpkg/nc.gpkg", package="sf"))
bir74_rast <- st_rasterize(nc["BIR74"])
plot(bir74_rast, reset=FALSE)
plot(st_geometry(nc),border="grey90", add=TRUE)
gridGraphics::grid.echo()
library(grid)
g <- grid.grab()
plot(nc["BIR74"])
gridGraphics::grid.echo()
gv <- grid.grab()
grid.newpage()
gridExtra::grid.arrange(g, gv, ncol=2)

Grabbing the base graphics device state lets you use 
gridExtra::grid.arrange() to place multiple graphics objects; here I 
haven't tried to constrain aspect or relative sizes. I don't think that 
the plot methods in sf and stars play well with layout, because they use 
it themselves internally.

Hope this helps,

Roger

>
> plot(mypoly,col=mypal(12),border=mypal(12))
>
> I expect that the first two plots display in region #1, the second added 
> to the first, and the third plot in region #2. However, this is not what 
> happens: actually, the third plot displays in region 1 erasing the 
> others. I understand that plot.stars when not "added" does not respect 
> the layout definition (and displays its own regions), and that my 
> problem comes from the way plot.stars deals with that.
>
> Has anyone an idea about a workaround ?
>
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-- 
Roger Bivand
Emeritus Professor
Department of Economics, Norwegian School of Economics,
Postboks 3490 Ytre Sandviken, 5045 Bergen, Norway.
e-mail: Roger.Bivand using nhh.no
https://orcid.org/0000-0003-2392-6140
https://scholar.google.no/citations?user=AWeghB0AAAAJ&hl=en