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## alex.R (2017-04-18)
## Alignment Explorer With Multiple Devices
## Copyright 2012-2017 Emmanuel Paradis
## This file is part of the R-package `ape'.
## See the file ../COPYING for licensing issues.
alex <- function(x, ...)
{
n <- nrow(x)
s <- ncol(x)
devmain <- dev.cur()
on.exit(dev.set(devmain))
NEW <- TRUE
cat("Click on two opposite corners of the zone you want to zoom-in.
Right-click to exit.\n")
repeat {
xy <- locator(2)
if (is.null(xy)) break
xy$y <- n - xy$y + 1
xy <- lapply(xy, function(x) sort(round(x)))
i1 <- xy$y[1L]; i2 <- xy$y[2L]
j1 <- xy$x[1L]; j2 <- xy$x[2L]
if (i1 > n || j1 > s) cat("Try again!\n") else {
if (i1 <= 0) i1 <- 1L
if (j1 <= 0) j1 <- 1L
if (i2 > n) i2 <- n
if (j2 > s) j2 <- s
if (NEW) {
dev.new()
devsub <- dev.cur()
NEW <- FALSE
} else dev.set(devsub)
image(x[i1:i2, j1:j2], xaxt = "n", ...)
atx <- axTicks(1)
axis(1, atx, labels = (j1:j2)[atx])
title(sub = paste("From", sQuote(deparse(substitute(x)))))
dev.set(devmain)
}
}
}
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