Causes all buffered output for the current graphics device to be written.

None.

None.

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.

FLUSH