Nothing
w <- gwindow("Example of canvas device within gWidgetsWWW")
g <- ggroup(cont = w, horizontal=FALSE)
ghtml(paste("Example of using the canvas device with gWidgetsWWW. Requires HTML5-compliant browser to work.",
"<br>",
"The canvas device uses javascript to write the graphic, not an image.",
"It is an alternative to the gsvg device, which requires its image to be loaded from a file.",
collapse="\n"), cont=g)
##' make a plot. This would, of course, be modified
makePlot <- function() {
## load packaage quietly
require(canvas, quietly=TRUE, warn=FALSE)
f <- paste(getStaticTmpFile(), ".canvas", sep="")
canvas(f, width=500, height=500, bg="#ffffff") # transparent will allow overplot
hist(rnorm(100))
dev.off()
f
}
if(!require(canvas)) {
glabel("This needs the canvas package to be installed", cont=g)
} else {
## Use a canvas widget
canvas <- gcanvas(cont = g, width=500, height=500)
svalue(canvas) <- makePlot()
b <- gbutton("click me for another", cont = g, handler = function(h,...) {
svalue(canvas) <- makePlot()
})
}
## add status bar and show off
gstatusbar("Powered by RApache and gWidgetsWWW", cont = w)
visible(w) <- TRUE
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