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Click on two points of a plot (map) to obtain an object of class Extent ('bounding box')
drawExtent(show=TRUE, col="red")Extent
logical. If TRUE, the extent will be drawn on the map
sets the color of the lines of the extent
if (FALSE) {
r1 <- raster(nrow=10, ncol=10)
values(r1) <- runif(ncell(r1))
plot(r1)
# after running the following line, click on the map twice
e <- drawExtent()
# after running the following line, click on the map twice
mean(values(crop(r1, drawExtent())))
}
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