Nothing
local({
## Example from Hans Rosling Talk
## https://www.ted.com/talks/hans_rosling_shows_the_best_stats_you_ve_ever_seen
data("UsAndThem")
scale01 <- function(x) {(x-min(x))/diff(range(x))}
tt <- tktoplevel()
tktitle(tt) <- "Us and Them"
colorkey = list('America'='#E5FF2F',
'Europe & Central Asia'='#FF982F',
'Middle East & North Africa'='#68FF5E',
'Sub-Saharan Africa'='#3F4FFF',
'South Asia'='#36BEE3',
'East Asia & Pacific'='#FF2F2F')
sel <- UsAndThem$Year==1962
p <- with(UsAndThem,
l_plot(x=Fertility[sel], y=LifeExpectancy[sel],
parent=tt,
color=unlist(colorkey)[match(Geographic.Region[sel],
names(colorkey))],
size=scale01(Population[sel])*200,
title="Us and Them",
xlabel="Fertility", ylabel="Life Expectancy",
itemLabel=as.character(Country[sel]),
glyph='ccircle',
linkingKey=as.character(Country[sel])))
updateYear <- function() {
year <- as.numeric(tclvalue(SliderValue))
sel <- UsAndThem$Year==year
if (sum(sel) > 0) {
with(UsAndThem,
l_configure(p,
x=Fertility[sel], y=LifeExpectancy[sel],
color=unlist(colorkey)[match(Geographic.Region[sel],
names(colorkey))],
size=scale01(Population[sel])*200,
itemLabel=as.character(Country[sel]),
glyph='ccircle',
linkingKey=as.character(Country[sel]),
sync='pull'))
l_configure(tl, text=year)
tcl("update", "idletasks")
}
}
tl <- l_layer_text(p, x=2, y=30, text="1962", size=60, index="end", color="gray70")
slider <- tkscale(tt, from=min(UsAndThem$Year),to=max(UsAndThem$Year),resolution=1, showvalue=TRUE, orient="horizontal" )
SliderValue <- tclVar("1962")
tkconfigure(slider, variable=SliderValue, command=function(...)updateYear())
tkpack(slider, fill="x", side='bottom')
tkpack(p, side='bottom', fill="both", expand=1)
})
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