[R] Stop tkbind

[jpara3]

Hi, I´m trying this example from the
website(http://www.sciviews.org/_rgui/tcltk/InteractiveTkrPlot.html), but
the problem is that i wnat to integrate to it an stop button that stops the
tkbind. Can someone please help me?

THanks!!

The code->>>

####################################

xCoords<-(-12:13)
yCoords<-xCoords*xCoords
labelsVec <- LETTERS
require(tcltk)
require(tkrplot)
indexLabeled<-c()
labeledPoints <- list()
tt <- tktoplevel()
tkwm.title(tt,"Click on a point to label it")
parPlotSize <- c()
usrCoords <- c()

plotFunction <- function()
{
  params <- par(bg="white")
  plot(xCoords,yCoords,main="Click on a point to label it")
  if (length(indexLabeled)>0)
    for (i in (1:length(indexLabeled)))
    {
      indexClosest <- indexLabeled[i]
      text(xCoords[indexClosest],yCoords[indexClosest],
           labels=labelsVec[indexClosest],pos=3)
    }
  parPlotSize <<- par("plt")
  usrCoords   <<- par("usr")
  par(params)
}

img <- tkrplot(tt,fun=plotFunction,hscale=1.5,vscale=1.5)
tkgrid(img)

labelClosestPoint <- function(xClick,yClick,imgXcoords,imgYcoords)
{
  squared.Distance <- (xClick-imgXcoords)^2 + (yClick-imgYcoords)^2
  indexClosest <- which.min(squared.Distance)
  indexLabeled <<- c(indexLabeled,indexClosest)
  tkrreplot(img)
}

OnLeftClick <- function(x,y)
{
  xClick <- x
  yClick <- y
  require(tcltk)
  width  <- as.numeric(tclvalue(tkwinfo("reqwidth",img)))
  height <- as.numeric(tclvalue(tkwinfo("reqheight",img)))

  xMin <- parPlotSize[1] * width
  xMax <- parPlotSize[2] * width
  yMin <- parPlotSize[3] * height
  yMax <- parPlotSize[4] * height

  rangeX <- usrCoords[2] - usrCoords[1]
  rangeY <- usrCoords[4] - usrCoords[3]

  imgXcoords <- (xCoords-usrCoords[1])*(xMax-xMin)/rangeX + xMin
  imgYcoords <- (yCoords-usrCoords[3])*(yMax-yMin)/rangeY + yMin

  xClick <- as.numeric(xClick)+0.5
  yClick <- as.numeric(yClick)+0.5
  yClick <- height - yClick

  xPlotCoord <- usrCoords[1]+(xClick-xMin)*rangeX/(xMax-xMin)
  yPlotCoord <- usrCoords[3]+(yClick-yMin)*rangeY/(yMax-yMin)

  msg <- paste("Label the point closest to these approximate plot
coordinates: \n",
               "x =",format(xPlotCoord,digits=2),",y
=",format(yPlotCoord,digits=2),"?")
  mbval<- tkmessageBox(title="Label Point Closest to These Approximate Plot
Coordinates",
                       message=msg,type="yesno",icon="question")

  if (tclvalue(mbval)=="yes")
    labelClosestPoint(xClick,yClick,imgXcoords,imgYcoords)
}

tkbind(img, "<Button-1>",OnLeftClick)
tkconfigure(img,cursor="hand2")






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