[R] locator() via tcltk

From: Sebastian Luque <spluque_at_gmail.com>
Date: Sat 04 Jun 2005 - 11:51:23 EST


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.

Regards,
Sebastian

-- 
Sebastian P. Luque

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Received on Sat Jun 04 11:59:15 2005

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