On Jul 24, 2014, at 2:05 PM, Julien Million wrote:
> Hi,
>
> i want to automatise the creation of some maps with R, however, I would need
> to be able to retrieve the coordinates of the axes that R is automatically
> generated.
>
> When using the package MAPS,
Case matters in R so this is the wrong spelling.
> and creating a map, R will automatically adjust
> the plot to the region that you are plotting.
>
> for example the two command:
> map(regions="Morocco")
> or
> map(regions="France")
> will generate plots with completely different axis and scale. If I want to
> automatically generate a map and add a legend to it, I would need to be able
> to retrieve the coordinates of my axis that were automatically generated in
> order to give coordinate to place my legend on the map.
>
> Basically I would like to automatise the following with a function, and be
> able to automatically get the coordinates for my legend)
>
require(maps)
> map(regions="Morocco")
> map.axes()
> legend(-12,34, "blablabla")
Perhaps something like this:
legend(-12,35.5, paste( paste("Xrange = ", round( par("usr")[1:2],2),
collapse=" "),
paste( "Yrange = ", round( par("usr")[3:4],2) ,
collapse=" "),
sep="\n") )
?par # since pkg::maps uses base graphics.
>
> map(regions="France")
> map.axes()
> legend(-150,40, "blablabla")
>
> mapcountry <- function(country) {
> map(regions=country)
> map.axes()
> legend(xxxx, yyyy, "blablabla")
> }
>
> I want to be able to extract the xxxx and yyyy automatically to be able to
> generate the legend within the function.
>
> Thanks
>
> Julien
>
>
>
> [[alternative HTML version deleted]]
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>
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
And thank you for providing working code.
--
David Winsemius
Alameda, CA, USA
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