grid.frame: Create a Frame for Packing Objects

Description

These functions, together with grid.pack, grid.place, packGrob, and placeGrob are part of a GUI-builder-like interface to constructing graphical images. The idea is that you create a frame with this function then use grid.pack or whatever to pack/place objects into the frame.

Usage

grid.frame(layout=NULL, name=NULL, gp=gpar(), vp=NULL, draw=TRUE)
frameGrob(layout=NULL, name=NULL, gp=gpar(), vp=NULL)

Arguments

layout

A Grid layout, or NULL. This can be used to initialise the frame with a number of rows and columns, with initial widths and heights, etc.

name

A character identifier.

An object of class viewport, or NULL.

An object of class gpar; typically the output from a call to the function gpar.

draw

Should the frame be drawn.

Value

A frame grob. grid.frame() returns the value invisibly.

Details

Both functions create a frame grob (a graphical object describing a frame), but only grid.frame() draws the frame (and then only if draw is TRUE). Nothing will actually be drawn, but it will put the frame on the display list, which means that the output will be dynamically updated as objects are packed into the frame. Possibly useful for debugging.

Examples

Run this code

grid.newpage()
grid.frame(name="gf", draw=TRUE)
grid.pack("gf", rectGrob(gp=gpar(fill="grey")), width=unit(1, "null"))
grid.pack("gf", textGrob("hi there"), side="right")

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