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

[Patrick Giraudoux]

Great ! Thanks Roger.  On this basis, I have a way to explore the issue 
now. Will give a feed-back on the list once done.
Best,
Patrick

Le 15/03/2022 à 11:27, Roger Bivand a écrit :
> 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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