This function can be used to generate a viewport path for use
in downViewport or seekViewport. A viewport path is a list of nested viewport names.
Usage
vpPath(...)
Arguments
…
Character values which are viewport names.
Value
A vpPath object.
Details
Viewport names must only be unique amongst viewports which
share the same parent in the viewport tree. This function can be used to generate a specification for
a viewport that includes the viewport's parent's name
(and the name of its parent and so on). For interactive use, it is possible to directly specify
a path, but it is strongly recommended that this function
is used otherwise in case the path separator is changed
in future versions of grid.