R: Display grid viewports.

showViewport {grid} | R Documentation

## Display grid viewports.

### Description

Produces a graphical display of (by default) the current grid viewport tree. It is also possible to display only specific viewports. Each viewport is drawn as a rectangle and the leaf viewports are labelled with the viewport name.

### Usage

    showViewport(vp = NULL, recurse = TRUE, depth = NULL,
                 newpage = FALSE, leaves = FALSE,
                 col = rgb(0, 0, 1, 0.2), fill = rgb(0, 0, 1, 0.1),
                 label = TRUE, nrow = 3, ncol = nrow)

### Arguments

`vp` | If `NULL`, the current viewport tree is displayed. Otherwise, a viewport (or vpList, or vpStack, or vpTree) or a vpPath that specifies which viewport to display.
`recurse` | Should the children of the specified viewport also be displayed?
`depth` | Only display viewports at the specified depth (may be a vector of depths).
`newpage` | Start a new page for the display? Otherwise, the viewports are displayed on top of the current plot.
`leaves` | Produce a matrix of smaller displays, with each leaf viewport in its own display.
`col` | The colour used to draw the border of the rectangle for each viewport and to draw the label for each viewport. If a vector, then the first colour is used for the top-level viewport, the second colour is used for its children, the third colour for their children, and so on.
`fill` | The colour used to fill each viewport. May be a vector as per `col`.
`label` | Should the viewports be labelled (with the viewport name)?
`nrow, ncol` | The number of rows and columns when `leaves` is `TRUE`. Otherwise ignored.

### See Also

`viewport` and `grid.show.viewport`

### Examples

    showViewport(viewport(width=.5, height=.5))

    showViewport(vpStack(viewport(width=.5, height=.5),
                         viewport(width=.5, height=.5)),
                 newpage=TRUE)

    showViewport(vpStack(viewport(width=.5, height=.5),
                         viewport(width=.5, height=.5)),
                 fill=rgb(1:0, 0:1, 0, .1),
                 newpage=TRUE)

[Package grid version 2.15.1 Index]