Encapsulate calculations and drawing

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Description

Evaluates an expression that includes both calculations and drawing that depends on the calculations so that both the calculations and the drawing will be rerun when the scene is redrawn (e.g., device resize or editing).

Intended only for expert use.

Usage

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recordGrob(expr, list, name=NULL, gp=NULL, vp=NULL)
grid.record(expr, list, name=NULL, gp=NULL, vp=NULL)

Arguments

expr

object of mode expression or call or an unevaluated expression.

list

a list defining the environment in which expr is to be evaluated.

name

A character identifier.

gp

An object of class gpar, typically the output from a call to the function gpar. This is basically a list of graphical parameter settings.

vp

A Grid viewport object (or NULL).

Details

A grob is created of special class "recordedGrob" (and drawn, in the case of grid.record). The drawDetails method for this class evaluates the expression with the list as the evaluation environment (and the grid Namespace as the parent of that environment).

Note

This function must be used instead of the function recordGraphics; all of the dire warnings about using recordGraphics responsibly also apply here.

Author(s)

Paul Murrell

See Also

recordGraphics

Examples

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grid.record({
              w <- convertWidth(unit(1, "inches"), "npc")
              grid.rect(width=w)
            },
            list())

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