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Evaluates an expression that includes both calculations and generating a grob that depends on the calculations so that both the calculations and the grob generation will be rerun when the scene is redrawn (e.g., device resize or editing).
Intended only for expert use.
delayGrob(expr, list, name=NULL, gp=NULL, vp=NULL)
grid.delay(expr, list, name=NULL, gp=NULL, vp=NULL)
object of mode expression
or call
or
an unevaluated expression.
a list defining the environment in which expr
is to
be evaluated.
A character identifier.
An object of class gpar
, typically the output
from a call to the function gpar
. This is basically
a list of graphical parameter settings.
A Grid viewport object (or NULL).
A grob is created of special class "delayedgrob"
(and drawn, in the case of grid.delay
).
The makeContent
method for this class
evaluates the expression with the list as the evaluation
environment (and the grid Namespace as the parent of that
environment).
The expr
argument should return a grob as its result.
These functions are analogues of the grid.record()
and recordGrob()
functions; the difference is that
these functions are based on the makeContent()
hook,
while those functions are based on the drawDetails()
hook.
# NOT RUN {
grid.delay({
w <- convertWidth(unit(1, "inches"), "npc")
rectGrob(width=w)
},
list())
# }
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