| grid.null | R Documentation |
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.
nullGrob(x = unit(0.5, "npc"), y = unit(0.5, "npc"),
default.units = "npc",
name = NULL, vp = NULL)
grid.null(...)
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 |
A null grob.
Paul Murrell
Grid,
viewport
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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