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## Initial version by Linlin Yan <linlin.yan@cos.name>
## URL: http://cos.name/cn/topic/101199
## Modified by Yihui Xie <yihui.xie@cos.name>
hanoi <- function(n, color = rainbow(n), interval = 0.5, ...) {
tower <- list(1:n, NULL, NULL)
draw.hanoi <- function() {
par(mfrow = c(1, 3), mar = rep(1, 4), ann = FALSE, xaxt = 'n', yaxt = 'n')
for (i in 1:3) {
plot(c(-n, n), c(0, n + 2), type = 'n')
if (length(tower[[i]]) > 0) {
barplot(rev(tower[[i]]), add = TRUE, horiz = TRUE,
col = color[rev(tower[[i]])], ...)
barplot(-rev(tower[[i]]), add = TRUE, horiz = TRUE,
col = color[rev(tower[[i]])], ...)
}
}
}
move.hanoi <- function(k, from, to, via) {
if (k > 1) {
move.hanoi(k - 1, from, via, to)
move.hanoi(1, from, to, via)
move.hanoi(k - 1, via, to, from)
}
else {
cat('Move ', tower[[from]][1], ' from ', LETTERS[from],
' to ', LETTERS[to], '\n')
flush.console()
tower[[to]] <<- c(tower[[from]][1], tower[[to]])
tower[[from]] <<- tower[[from]][-1]
dev.hold()
draw.hanoi()
ani.pause()
}
}
draw.hanoi()
move.hanoi(n, 1, 2, 3)
}
x11(width = 7, height = 4)
hanoi(7)
# faster, more layers
hanoi(10, interval = 0.1)
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