trellis.par.get(name)
trellis.par.set(name, value)

name:

character string giving the name of a Trellis parameter list.

value:

a list giving the new value for parameter name. It must have exactly the same component names as the existing list.

Trellis parameters are stored as an attribute named trellis.settings of the currently active device.

Current parameters are named: add.line add.text bar.fill box.3d box.dot box.rectangle box.umbrella cloud.3d dot.line dot.symbol fill pie.fill plot.line plot.symbol reference.line regions strip.background strip.shingle superpose.line superpose.symbol wires