defaultpf.trellis: defaultpf trellis
Description
If no Positioning Method specified, choose a default using this
function. The idea is that this is called with all the variables
in the environment of panel.superpose.dl, and this can be
user-customizable by setting the directlabels.defaultpf.lattice
option to a function like this.
Usage
defaultpf.trellis(lattice.fun.name, groups, type, ...)