if (FALSE) {
## These cannot be run by examples() but should be OK when pasted
## into an interactive R session with the tcltk package loaded
tt <- tktoplevel()
bb<-1
img <-tkrplot(tt, function() plot(1:20,(1:20)^bb))
f<-function(...) {
    b <- as.numeric(tclvalue("bb"))
    if (b != bb) {
        bb <<- b
        tkrreplot(img)
    }
}
s <- tkscale(tt, command=f, from=0.05, to=2.00, variable="bb",
             showvalue=FALSE, resolution=0.05, orient="horiz")
tkpack(img,s)
}
Run the code above in your browser using DataLab