These functions calculate points along the perimeter (or length) of a grob.
grobCoords(x, closed, …)
grobPoints(x, closed, …)
emptyCoords
isEmptyCoords(coords)A grob object.
Whether we are asking for points along the perimeter of a closed object or points along the length of an open object. Some grobs (e.g., X-splines) can do both.
Arguments to be used by methods.
A set of grob coordinates (as generated by grobCoords).
A list of lists with components x and y.
All locations are in inches relative to the current grid viewport.
Custom grobs can write their own methods for grobPoints.
The emptyCoords object can be used to return a "null"
result (e.g., when asking for closed coordinates on an
open line) and the isEmptyCoords function can be used to check for
"null" results.