Runs the same algorithm as in plot.euler() / panel.euler.labels() to
label the overlaps in the Euler diagram. This is useful if you want to
use your own solution to plot the final diagram.
label(x, labels)An object of class 'euler'
An optional character vector of labels for the diagram.
A numeric matrix of x and y coordinates for the labels, as well as the quantities and proportions for the overlaps depicted in the labels.
In the cases where x is a list of Euler diagrams (if the by argument
was used in the call to euler()), this function returns a list of
matrices with coordinates.