Nothing
app <- Builder$new(
URLMap$new(
'^/.*\\.html$' = function(env){
req <- Request$new(env)
res <- Response$new()
if (is.null(req$GET()$n)){
n <- 100
} else {
n <- as.integer(req$GET()$n)
}
res$write('How many squares?\n')
res$write('<form method="GET">\n')
res$write(sprintf('<input type="text" name="n" value="%d">\n',n))
res$write('<input type="submit" name="Submit">\n</form>\n<br>')
if (n>0){
res$write(paste('<img src="',req$to_url('/plot.png',n=n),'">',sep=''))
}
res$finish()
},
'^/.*\\.png$' = function(env){
req <- Request$new(env)
res <- Response$new()
res$header('Content-type','image/png')
if (is.null(req$GET()$n)){
n <- 100
} else {
n <- as.integer(req$GET()$n)
}
t <- tempfile()
png(file=t)
png(t,type="cairo",width=200,height=200)
par(mar=rep(0,4))
plot(rnorm(n),col=rainbow(n,alpha=runif(n,0,1)),pch='.',cex=c(2,3,4,5,10,50))
dev.off()
res$body <- t
names(res$body) <- 'file'
res$finish()
},
'.*' = Redirect$new('/index.html')
)
)
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