You have two asynchronous processes here: your R function will return,
leaving a Tk widget up. Duncan Murdoch's solution is to give you a
function that will retrieve at some future stage the result of the last
press (if any) of "Get coordinates" button. Is that what you want?
I think it is more likely you want to wait for the Tk interaction and then
return the results, that is use a `modal' widget. If so, take a look at
the examples in src/library/tcltk/R/utils.R which are modal and return
their results.
On Fri, 3 Jun 2005, Sebastian Luque wrote:
Hello,
I'm trying to write a function using tcltk to interactively modify a plot
and gather locator() data. I've read Peter's articles in Rnews, the help
pages in tcltk, http://bioinf.wehi.edu.au/~wettenhall/RTclTkExamples/,
plus a post in R-help sometime ago, but haven't found a solution.
The idea goes something like this:
require(tcltk)
testplot <- function() {
getcoords <- function(...) {
locator(5)
}
x <- 1:1000
y <- rnorm(1000)
plot(x, y)
base <- tktoplevel()
loc.pts <- tkbutton(base, text = "Get coordinates", command = getcoords)
quit.but <- tkbutton(base, text = "Quit",
command = function() tkdestroy(base))
tkpack(loc.pts, quit.but)
}
I'd like testplot to return the value from getcoords. The "Get
coordinates" button seems to be correctly calling getcoords, and locator
is doing its job, but I don't know how to store its value. Any help is
very much appreciated.
--
Brian D. Ripley, [EMAIL PROTECTED]
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
Oxford OX1 3TG, UK Fax: +44 1865 272595
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