Records arbitrary code on the graphics engine display list. Useful for encapsulating calculations with graphical output that depends on the calculations. Intended only for expert use.
object of mode
a list defining the environment in which
The code in
expr is evaluated in an environment constructed
env as the parent of that environment.
All three arguments are saved on the graphics engine display list so that on a device resize or copying between devices, the original evaluation environment can be recreated and the code can be re-evaluated to reproduce the graphical output.
The value from evaluating
This function is not intended for general use. Incorrect or improper use of this function could lead to unintended and/or undesirable results.
An example of acceptable use is querying the current state of a graphics device or graphics system setting and then calling a graphics function.
An example of improper use would be calling the
to performing assignments in the global environment.
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