Given several objects which are capable of being plotted, create a list containing these objects as if they were successive layers of a plot. The list can then be plotted in different ways.
Objects which can be plotted by
Default values of the plotting arguments for each of the objects.
A list of lists of arguments of the form
A list of objects.
Layering is a simple mechanism for controlling a high-level plot that is composed of several successive plots, for example, a background and a foreground plot. The layering mechanism makes it easier to issue the plot command, to switch on or off the plotting of each individual layer, to control the plotting arguments that are passed to each layer, and to zoom in.
Each individual layer in the plot should be saved as an object
that can be plotted using
plot. It will typically belong to
some class, which has a method for the generic function
layered simply saves the objects
as a list of class
"layered". This list can then be plotted by
plot.layered. Thus, you only need to
type a single
plot command to produce the multi-layered plot.
Individual layers of the plot can be switched on or off, or
manipulated, using arguments to
plotargs contains default values of the
plotting arguments for each layer. It should be a list, with one
entry for each object in
.... Each entry of
should be a list of arguments in the form
name=value, which are
recognised by the
plot method for the relevant layer.
plotargs can also include an argument named
specifying (the name of) a function to perform the plotting
instead of the generic
The length of
plotargs should either be equal to the
number of layers, or equal to 1. In the latter case it will be
replicated to the appropriate length.
A list, belonging to the class
There are methods for
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