ievent.wait {iplots}

R Documentation

Interactive events

Description

This function provides a way of building interactive event loops in R. Currently SJava interface has no stable callbacks, therefore this is the only way of defining new interactions in iPlots.

ievent.wait waits until some iPlots event (iEvent) occurs. The most commonly used events include selection change and the "break" event. It is possible to generate user-definable events (such as events sent by custom buttons or menu entries) with low-level API (via SJava)

Note that in the current implementation the Windows GUI "freezes" until the function returns.

Usage

ievent.wait()

Value

NULL is the break event occured or a ievent object if some other event occured.

Examples

  data(iris)
  attach(iris)
  iplot(Sepal.Length, Petal.Length)

  d<-iplot.data()

  iabline(lm(d$y ~ d$x), col = "red")
  ilines(lowess(d$x,d$y), col = "#0000c0")
  ilines(c(0,0),c(0,0), col = "marked", visible = FALSE)

  cat("Select 'Break' from the menu of any plot to return back to R.\n")

  while (!is.null(ievent.wait())) {
    if (iset.sel.changed()) {
      s <- iset.selected()
      if (length(s) > 1) 
        iobj.opt(x=lowess(d$x[s],d$y[s]),visible = TRUE)
      else iobj.opt(visible = FALSE)
    }
  }
  for(i in 1:3) iobj.rm()
  iplot.off()

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