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

1 2 3 4 | ```
grobCoords(x, closed, ...)
grobPoints(x, closed, ...)
emptyCoords
isEmptyCoords(coords)
``` |

`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 |

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.

A list of lists with components `x`

and `y`

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

Paul Murrell

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