grobCoords {grid} | R Documentation |
These functions calculate points along the perimeter (or length) of a grob.
grobCoords(x, closed, ...) grobPoints(x, closed, ...) emptyCoords isEmptyCoords(coords)
x |
A grob object. |
closed |
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. |
coords |
A set of grob coordinates (as generated by |
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.
A list of lists with components x
and y
.
All locations are in inches relative to the current grid viewport.
Paul Murrell