grid.null
Null Graphical Object
Description
These functions create a NULL graphical object, which has zero width, zero height, and draw nothing. It can be used as a place-holder or as an invisible reference point for other drawing.
Usage
nullGrob(x = unit(0.5, "npc"), y = unit(0.5, "npc"), default.units = "npc", name = NULL, vp = NULL) grid.null(...)
Arguments
x | A numeric vector or unit object specifying x-location. |
y | A numeric vector or unit object specifying y-location. |
default.units | A string indicating the default units to use if |
name | A character identifier. |
vp | A Grid viewport object (or NULL). |
... | Arguments passed to |
Value
A null grob.
Author(s)
Paul Murrell
See Also
Examples
grid.newpage() grid.null(name="ref") grid.rect(height=grobHeight("ref")) grid.segments(0, 0, grobX("ref", 0), grobY("ref", 0))
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Licensed under the GNU General Public License.