NAME

blankscreen − turns screen refresh on and off

SPECIFICATION

C
blankscreen(bool)
Boolean bool;

FORTRAN
subroutine blanks(bool)
logical bool

Pascal
procedure blankscreen(bool: Boolean);

DESCRIPTION

blankscreen turns screen refresh on and off.  bool = TRUE (1) stops display; bool = FALSE (0) restarts display.  When bitplanes are simultaneously viewed and updated (as in single buffer mode, RGB mode, or when the front buffer is displayed in double buffer mode), there is competition for memory which reduces performance.  This is most true for non-interlaced monitors.  To speed up drawing in these cases, turn off the display while drawing. 

NOTE

This routine is available only in immediate mode. 

Version 2.5  —  April 22, 1987