R/negtrans.gui.R

In in2extRemes: Into the extRemes Package

negtrans.gui <- function(base.txt) {
    
    # This function provides a gui interface for finding the negative (for mins)
    # transformation of a dataset.  The gui will list all objects of class
    # "in2extRemesDataObject" and the column names of the user selected object.
    # After taking the negative of the selected data, will add a new column to the
    # data object with the extension ".neg" attached to the original column name(s).

    # Internal functions
    
    refresh <- function() {
    
        # When data is selected, this function fills the lists for the columns of
        # the data set so that the user can select which column(s) to transform.
    
    	tkdelete(col.listbox, 0.0, "end")
    
    	if(!is.nothing) {

    	    data.select <- as.numeric(tkcurselection( data.listbox))+1
    	    dd <- get(full.list[ data.select])

    	} else dd <- in2extRemesData
    
    	for(i in 1:ncol(dd$data)) tkinsert(col.listbox, "end", paste(colnames(dd$data)[i]))

    	invisible()

    } # end of refresh fcn
    
    neg.trans <- function() {

            # Function invoked when the "ok" button is pressed.  Actually takes negative
            # transformation of the data.
            
            if(!is.nothing) {

            	data.select <- as.numeric(tkcurselection(data.listbox))+1
            	dd.cmd <- paste( "dd <- get(\"", full.list[ data.select], "\")", sep="")

            } else dd.cmd <- "dd <- in2extRemesData"
            eval(parse(text = dd.cmd))
            write(dd.cmd, file = "in2extRemes.log", append = TRUE) 
            
            cols.selected.cmd <- "cols.selected <- character(0)"
            eval(parse(text = cols.selected.cmd))
            write(cols.selected.cmd, file = "in2extRemes.log", append = TRUE)
            
            cnamesCMD <- "cnames <- colnames(dd[[\"data\"]])"
            eval( parse( text=cnamesCMD))
            write( cnamesCMD, file="in2extRemes.log", append=TRUE)
            
            temp <- as.numeric(tkcurselection(col.listbox)) + 1
            
            # Make sure a column has been selected.
            if( length( temp) == 0) return()
            
            # cols.selected <- cnames[temp]
            for(i in 1:length(temp)) {

            	cols.selected.cmd <- paste( "cols.selected <- c( cols.selected, \"", cnames[temp[i]], "\")", sep="")
            	eval( parse( text=cols.selected.cmd))
            	write( cols.selected.cmd, file="in2extRemes.log", append=TRUE)

            } # end of for 'i' loop.
            
            negCMD <- "neg <- -dd[[\"data\"]][, cols.selected]"
            eval( parse( text=negCMD))
            write( negCMD, file="in2extRemes.log", append=TRUE)
            
            newnames <- paste( cnames[temp], ".neg", sep="")

            for(i in 1:length(newnames)) {

            	cnamesCMD <- paste( "cnames <- c( cnames, \"", newnames[i], "\")", sep="")
            	eval( parse( text=cnamesCMD))
            	write( cnamesCMD, file="in2extRemes.log", append=TRUE)

	    } # end of for 'i' loop.

            dataCMD <- "dd[[\"data\"]] <- cbind( dd[[\"data\"]], neg)"
            eval( parse( text=dataCMD))
            write( dataCMD, file="in2extRemes.log", append=TRUE)

            colnamesCMD <- "colnames( dd[[\"data\"]]) <- cnames"
            eval(parse(text = colnamesCMD))
            write(colnamesCMD, file = "in2extRemes.log", append = TRUE)

            assignCMD <- paste( "assign(\"", full.list[data.select], "\", dd, pos = \".GlobalEnv\")", sep = "")
            eval(parse(text = assignCMD))
            write(assignCMD, file = "in2extRemes.log", append = TRUE)
            
            msg <- paste("\n", "Negative transformation taken for", "\n",
            		" ", cols.selected, " and assigned to ", newnames, sep="")
            cat(msg)
            tkdestroy( base)

            invisible()

    	} # end of internal 'neg.trans' fcn
    
    neghelp <- function() {

    	help.msg1 <- paste( " ", "This is a simple function that takes a data set X and returns -X.", "  ",
    			"Column binds the resulting vector onto the same data frame as X.", sep = "\n")
    	cat(help.msg1)

    	invisible()

    } # end of internal 'neghelp' fcn
    
    endprog <- function() {

    	tkdestroy(base)

    } # end of internal 'endprog' function.
    
    #####################
    # Frame/button setup
    #####################
    
    base <- tktoplevel()
    tkwm.title( base, "Negative Transformation")
    
    top.frm <- tkframe( base, borderwidth=2, relief="groove")
    mid.frm <- tkframe( base, borderwidth=2, relief="groove")
    bot.frm <- tkframe( base, borderwidth=2, relief="groove")
    
    # Top frame for data sets...
    
    data.listbox <- tklistbox( top.frm,
    			yscrollcommand=function(...) tkset(data.scroll, ...),
    			selectmode="single",
    			width=20,
    			height=5,
    			exportselection=0)
    
    data.scroll <- tkscrollbar( top.frm, orient="vert",
    			command=function(...) tkyview( data.listbox, ...))
    
    temp <- ls(all.names=TRUE, name=".GlobalEnv")
    full.list <- character(0)
    is.nothing <- TRUE
    for( i in 1:length( temp)) {
            if( is.null( class( get( temp[i])))) next
            if( (class(get( temp[i]))[1] == "in2extRemesDataObject")) {
                    tkinsert( data.listbox, "end", paste( temp[i]))
            	full.list <- c( full.list, temp[i])
    		is.nothing <- FALSE
    		}
    } # end of for i loop
    
    tkpack( tklabel( top.frm, text="Data Object", padx=4), side="top")
    tkpack( data.listbox, data.scroll, side="left", fill="y")
    tkpack( top.frm)
    tkbind( data.listbox, "<Button-1>", "")
    tkbind( data.listbox, "<ButtonRelease-1>", refresh)
    
    # Middle frame for columns of chosen dataset...
    
    col.listbox <- tklistbox( mid.frm,
    			yscrollcommand=function(...) tkset( col.scroll, ...),
    			selectmode="multiple",
    			width=20,
    			height=5,
    			exportselection=0)
    
    col.scroll <- tkscrollbar( mid.frm, orient="vert",
    			command=function(...) tkyview( col.listbox, ...))
    
    if( is.nothing) {
    for( i in 1:ncol( in2extRemesData$data))
    	tkinsert( col.listbox, "end", paste( colnames( dd$data)[i]))
    # end of for i loop
    	} else tkinsert( col.listbox, "end", "")
    
    tkpack( tklabel( mid.frm, text="Variables to Transform", padx=4),
    		side="top")
    tkpack( col.listbox, side="left")
    tkpack( col.scroll, side="right")
    
    ok.but <- tkbutton( bot.frm, text="OK", command=neg.trans)
    cancel.but <- tkbutton( bot.frm, text="Cancel", command=endprog)
    
    help.but <- tkbutton( bot.frm, text="Help", command=neghelp)
    
    tkpack( ok.but, cancel.but, side="left")
    tkpack( help.but, side="right")
    
    # place bindings for return key.
    tkbind( ok.but, "<Return>", neg.trans)
    tkbind( cancel.but, "<Return>", endprog)
    tkbind( help.but, "<Return>", neghelp)
    
    tkpack( top.frm, fill="x")
    tkpack( mid.frm, fill="x")
    tkpack( bot.frm, side="bottom")

} # end of 'negtrans.gui' fcn