| grobCoords {grid} | R Documentation |
Calculate Points on the Perimeter of a Grob
Description
These functions calculate points along the perimeter (or length) of a grob.
Usage
grobCoords(x, closed, ...)
grobPoints(x, closed, ...)
emptyCoords
isEmptyCoords(coords)
Arguments
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 |
Details
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.
Value
A list of lists with components x and y.
All locations are in inches relative to the current grid viewport.
Author(s)
Paul Murrell