A generic function used by l_facet when facetting an existing loon plot.
get_facets(widget, ...)A list containing the named components plots, subtitles,
child = child, and new.toplevel containing the facets as plots
and other relevant information to construct the facetted plot.
the loon widget
other arguments to the function used to create
the loon plot for each facet. Depending on the plot being facetted, these
include the arguments by, on, parent, layout,
inheritLayers, separate, and bySubstitute.
See l_facet for details on these parameters.
Other loon plot constructor parameters can be passed as well this way.
l_facet