grid (version 3.2.4)

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 x, y, width, or height are only given as numeric vectors.
name
A character identifier.
vp
A Grid viewport object (or NULL).
...
Arguments passed to nullGrob().

Value

A null grob.

See Also

Grid, viewport

Examples

Run this code
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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