EMPTY Procedure
Causes all buffered output for the current graphics device to be written.
Usage
Parameters
None.
Keywords
None.
Discussion
PV‑WAVE uses buffered output on many image devices for reasons of efficiency. This leads to rare occasions where a program needs to be certain that data are not waiting in a buffer, but have actually been output. This procedure is handy for such occasions.
EMPTY is a low-level graphics routine. PV‑WAVE graphics routines generally handle the flushing of buffered data transparently to you, so the need for EMPTY is extremely rare.
