R: Null Graphical Object

grid.null {grid}

R Documentation

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.

Author(s)

Paul Murrell

Examples

grid.newpage()
grid.null(name="ref")
grid.rect(height=grobHeight("ref"))
grid.segments(0, 0, grobX("ref", 0), grobY("ref", 0))

[Package grid version 3.4.1 Index]