R: Create Sets of Coordinates for Grid Grobs

gridCoords {grid}

R Documentation

Create Sets of Coordinates for Grid Grobs

Description

These functions support the development of grobPoints methods for custom grobs.

Usage

gridCoords(x, y)
gridGrobCoords(x, name, rule = NULL)
gridGTreeCoords(x, name)
emptyCoords
emptyGrobCoords(name)
emptyGTreeCoords(name)
isEmptyCoords(coords)

Arguments

`x`	For `gridCoords` a numeric vector. For `gridGrobCoords` a list of `"GridCoords"` objects. For `gridGTreeCoords` a list of either `"GridGrobCoords"` or `"GridGTreeCoords"` objects.
`y`	A numeric vector.
`name`	A character value.
`rule`	A fill rule, either `"winding"` or `"evenodd"`, or `NULL`.
`coords`	A set of grob coordinates (as generated by `grobCoords`).

Details

These functions help the developer of a grobPoints method to generate the coordinates from a custom grob.

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

For gridCoords a "GridCoords" object. For gridGrobCoords a "GridGrobCoords" object. For gridGTreeCoords a "GridGTreeCoords" object.

Author(s)

Paul Murrell

[Package grid version 4.4.1 Index]