# grobCoords

##### Calculate Points on the Perimeter of a Grob

These functions calculate points along the perimeter (or length) of a grob.

- Keywords
- dplot

##### Usage

```
grobCoords(x, closed, …)
grobPoints(x, closed, …)
emptyCoords
isEmptyCoords(coords)
```

##### Arguments

- x
A grob object.

- closed
Whether we are asking for points along the perimeter of a closed object or points along the length of an open object. Some grobs (e.g., X-splines) can do both.

- …
Arguments to be used by methods.

- coords
A set of grob coordinates (as generated by

`grobCoords`

).

##### Details

Custom grobs can write their own methods for `grobPoints`

.

The `emptyCoords`

object can be used to return a "null"
result (e.g., when asking for `closed`

coordinates on an
open line) and the `isEmptyCoords`

function can be used to check for
"null" results.

##### Value

A list of lists with components `x`

and `y`

.
All locations are in inches relative to the current grid viewport.

*Documentation reproduced from package grid, version 3.6.1, License: Part of R 3.6.1*

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