I was trying to write a small routine using the tcltk library which
allows a little bit of interaction with a plot. Basically, using the
function locator(1), a user could click on an area of a graph which
would cause a little tcltk window to pop up. When they have finished
with the window, they click on a tcltk button, the window disappears,
allowing the user to select another point on the graph and repeat the
procedure.
This sort of works, but I can't get the tcltk window to disappear in
between mouse clicks, so the user clicks, the window pops up, they press
ok, but the window remains until _after_ a new point has been selected.
Here is an example:
plot(1)
for(i in 1:3) {
tq()
# I want the window from tq to disappear after pressing ok
# then wait until after a point has been selected before
# reappearing. But how?
locator(1)
}
where
"tq" <-
function(){
base <- tktoplevel()
done <- tclVar(0)
q.but <- tkbutton(base,text="Quit",
command=function()tclvalue(done) <- 1)
tkpack(q.but)
tkbind(base, "<Destroy>", function()tclvalue(done) <- 2)
tkwait.variable(done)
if(tclvalue(done)=="2") stop("aborted")
tkdestroy(base)
}
I am working on Solaris using R 1.5.0.
Robert Denham
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