Hello R users
When I want to zoom in on a map or any plot in R, I usually use the locator
function to reset the
limit of the plot and do something like:
library(maptools)
library(mapdata)
map('worldHires',ylim=c(40,55),xlim=c(-90,-60))
points(-71,47,col="red",pch=16)
text(-73,49,"Hello")
l<-locator(2)
map('worldHires',ylim=range(l$y),xlim=range(l$x))
points(-71,47,col="red",pch=16)
text(-73,49,"Hello")
I find this a bit annoying to type when there are a lot of things in a complex
map. Now, what
I would like to do is create a function that would zoom in on any type of plot
or map without having
to retype the steps that lead to the new rescaled plot. For this, I guess the
function would have to
find which calls/expressions led to the actual plot. Then, the function would
only need to change
the ylim and xlim in the expression leading to the plot creation and reevaluate
all expressions.
So my question is this: is there a function that can retrieve the call sequence
that led to the actual plot?
Perhaps a function similar to this already exists? I've looked into the zoom
and zoomInPlot functions,
but none of them do exactly what I want. The zoomInPlot function comes close,
but it seems to be
limited to simple plots.
Thanks
Francois Rousseu
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