grid.add {grid} | R Documentation

## Add a Grid Graphical Object

### Description

Add a grob to a gTree or a descendant of a gTree.

### Usage

    grid.add(gPath, child, strict = FALSE, grep = FALSE,
             global = FALSE, allDevices = FALSE, redraw = TRUE)

    addGrob(gTree, child, gPath = NULL, strict = FALSE, grep = FALSE,
            global = FALSE, warn = TRUE)

    setChildren(x, children)

### Arguments

`gTree, x` | A gTree object.
`gPath` | A gPath object. For `grid.add` this specifies a gTree on the display list. For `addGrob` this specifies a descendant of the specified gTree.
`child` | A grob object.
`children` | A gList object.
`strict` | A boolean indicating whether the gPath must be matched exactly.
`grep` | A boolean indicating whether the `gPath` should be treated as a regular expression. Values are recycled across elements of the `gPath` (e.g., `c(TRUE, FALSE)` means that every odd element of the `gPath` will be treated as a regular expression).
`global` | A boolean indicating whether the function should affect just the first match of the `gPath`, or whether all matches should be affected.
`warn` | A logical to indicate whether failing to find the specified gPath should trigger an error.
`allDevices` | A boolean indicating whether all open devices should be searched for matches, or just the current device. NOT YET IMPLEMENTED.
`redraw` | A logical value to indicate whether to redraw the grob.

### Details

`addGrob` copies the specified grob and returns a modified grob.

`grid.add` destructively modifies a grob on the display list. If `redraw` is `TRUE` it then redraws everything to reflect the change.

`setChildren` is a basic function for setting all children of a gTree at once (instead of repeated calls to `addGrob`).

### Value

`addGrob` returns a grob object; `grid.add` returns `NULL`.

### Author(s)

Paul Murrell

### See Also

`grob`, `getGrob`, `addGrob`, `removeGrob`.

[Package grid version 3.3.2 Index]