R: Draw a Diagram of a Grid Layout

grid.show.layout {grid} | R Documentation

## Draw a Diagram of a Grid Layout

### Description

This function uses Grid graphics to draw a diagram of a Grid layout.

### Usage

    grid.show.layout(l, newpage=TRUE, vp.ex = 0.8, bg = "light grey",
                 cell.border = "blue", cell.fill = "light blue",
                 cell.label = TRUE, label.col = "blue",
                 unit.col = "red", vp = NULL)

### Arguments

`l` | A Grid layout object.
`newpage` | A logical value indicating whether to move on to a new page before drawing the diagram.
`vp.ex` | positive number, typically in (0,1], specifying the scaling of the layout.
`bg` | The colour used for the background.
`cell.border` | The colour used to draw the borders of the cells in the layout.
`cell.fill` | The colour used to fill the cells in the layout.
`cell.label` | A logical indicating whether the layout cells should be labelled.
`label.col` | The colour used for layout cell labels.
`unit.col` | The colour used for labelling the widths/heights of columns/rows.
`vp` | A Grid viewport object (or NULL).

### Details

A viewport is created within `vp` to provide a margin for annotation, and the layout is drawn within that new viewport. The margin is filled with light grey, the new viewport is filled with white and framed with a black border, and the layout regions are filled with light blue and framed with a blue border. The diagram is annotated with the widths and heights (including units) of the columns and rows of the layout using red text. (All colours are defaults and may be customised via function arguments.)

### Value

None.

### Author(s)

Paul Murrell

### See Also

Grid, `viewport`, `grid.layout`

### Examples

    ## Diagram of a simple layout
    grid.show.layout(grid.layout(4,2,
                         heights=unit(rep(1, 4),
                                      c("lines", "lines", "lines", "null")),
                         widths=unit(c(1, 1), "inches")))

[Package grid version 3.1.2 Index]