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# IGraph R package
# Copyright (C) 2005-2012 Gabor Csardi <csardi.gabor@gmail.com>
# 334 Harvard street, Cambridge, MA 02139 USA
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
#
###################################################################
#' Run igraph demos, step by step
#'
#' Run one of the accompanying igraph demos, somewhat interactively, using a Tk
#' window.
#'
#' This function provides a somewhat nicer interface to igraph demos that come
#' with the package, than the standard \code{\link{demo}} function. Igraph
#' demos are divided into chunks and \code{igraph_demo} runs them chunk by
#' chunk, with the possibility of inspecting the workspace between two chunks.
#'
#' The \code{tcltk} package is needed for \code{igraph_demo}.
#'
#' @aliases igraphdemo
#' @param which If not given, then the names of the available demos are listed.
#' Otherwise it should be either a filename or the name of an igraph demo.
#' @return Returns \code{NULL}, invisibly.
#' @author Gabor Csardi \email{csardi.gabor@@gmail.com}
#' @seealso \code{\link{demo}}
#' @export
#' @keywords graphs
#' @examples
#'
#' igraph_demo()
#' if (interactive()) {
#' igraph_demo("centrality")
#' }
#'
igraph_demo <- function(which) {
if (missing(which)) {
demodir <- system.file("demo", package="igraph")
if (demodir=="") {
stop("Could not find igraph demos, broken igraph installation?")
}
return( sub("\\.R$", "", list.files(demodir)) )
}
if (!grepl("\\.R$", which)) {
which <- paste(which, sep=".", "R")
}
if (!file.exists(which) && ! grepl("^/", which)) {
which <- system.file( paste("demo", sep="/", which), package="igraph" )
}
if (which=="" || !file.exists(which)) {
stop("Could not find demo file")
}
.igraphdemo.next <- function(top, txt) {
act <- as.character(tcltk::tktag.nextrange(txt, "active", "0.0"))
if (length(act)==0) {
return()
}
options(keep.source=TRUE)
text <- tcltk::tclvalue(tcltk::tkget(txt, act[1], act[2]))
cat("=======================================================\n");
expr <- parse(text=text)
for (i in seq_along(expr)) {
co <- as.character(attributes(expr)$srcref[[i]])
co[1] <- paste("> ", sep="", co[1])
if (length(co)>1) {
co[-1] <- paste(" +", sep="", co[-1])
}
cat(co, sep="\n")
res <- withVisible(eval(expr[[i]], envir=.GlobalEnv))
if (res$visible) {
print(res$value)
}
}
cat("> -------------------------------------------------------\n");
cat(options()$prompt)
tcltk::tktag.remove(txt, "activechunk", act[1], act[2])
tcltk::tktag.remove(txt, "active", act[1], act[2])
nex <- as.character(tcltk::tktag.nextrange(txt, "activechunk", act[1]))
if (length(nex)!=0) {
tcltk::tktag.add(txt, "active", nex[1], nex[2])
tcltk::tksee(txt, paste(sep="", as.numeric(nex[2]), ".0"))
tcltk::tksee(txt, paste(sep="", as.numeric(nex[1]), ".0"))
}
}
.igraphdemo.close <- function(top) {
tcltk::tkdestroy(top)
}
.igraphdemo.reset <- function(top, txt, which) {
demolines <- readLines(which)
demolines <- demolines[!grepl("^pause\\(\\)$", demolines)]
demolines <- paste(" ", sep="", demolines)
ch <- grep("^[ ]*###", demolines)
ch <- c(ch, length(demolines)+1)
if (length(ch)==1) {
warning("Demo source file does not contain chunks")
} else {
demolines <- demolines[ch[1]:length(demolines)]
ch <- grep("^[ ]*###", demolines)
ch <- c(ch, length(demolines)+1)
}
tcltk::tkconfigure(txt, state="normal")
tcltk::tkdelete(txt, "0.0", "end")
tcltk::tkinsert(txt, "insert", paste(demolines, collapse="\n"))
tcltk::tkconfigure(txt, state="disabled")
for (i in seq_along(ch[-1])) {
from <- paste(sep="", ch[i], ".0")
to <- paste(sep="", ch[i+1]-1, ".0")
tcltk::tktag.add(txt, "chunk", from, to)
tcltk::tktag.add(txt, "activechunk", from, to)
}
tcltk::tktag.configure(txt, "chunk", "-borderwidth", "1")
tcltk::tktag.configure(txt, "chunk", "-relief", "sunken")
if (length(ch) >= 2) {
tcltk::tktag.add(txt, "active", paste(sep="", ch[1], ".0"),
paste(sep="", ch[2]-1, ".0"))
tcltk::tktag.configure(txt, "active", "-foreground", "red")
tcltk::tktag.configure(txt, "active", "-background", "lightgrey")
}
comm <- grep("^#", demolines)
for (i in comm) {
tcltk::tktag.add(txt, "comment", paste(sep="", i, ".0"),
paste(sep="", i, ".end"))
}
tcltk::tktag.configure(txt, "comment", "-font", "bold")
tcltk::tktag.configure(txt, "comment", "-foreground", "darkolivegreen")
}
top <- tcltk::tktoplevel(background="lightgrey")
tcltk::tktitle(top) <- paste("igraph demo:", which)
main.menu <- tcltk::tkmenu(top)
tcltk::tkadd(main.menu, "command", label="Close", command=function()
.igraphdemo.close(top))
tcltk::tkadd(main.menu, "command", label="Reset", command=function()
.igraphdemo.reset(top, txt, which))
tcltk::tkconfigure(top, "-menu", main.menu)
scr <- tcltk::tkscrollbar(top, repeatinterval=5,
command=function(...) tcltk::tkyview(txt,...))
txt <- tcltk::tktext(top, yscrollcommand=function(...) tcltk::tkset(scr, ...),
width=80, height=40)
but <- tcltk::tkbutton(top, text="Next", command=function()
.igraphdemo.next(top, txt))
tcltk::tkpack(but, side="bottom", fill="x", expand=0)
tcltk::tkpack(scr, side="right", fill="y", expand=0)
tcltk::tkpack(txt, side="left", fill="both", expand=1)
.igraphdemo.reset(top, txt, which)
invisible()
}
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