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/* This file contains the erase method, which is a standard part of the
libplot. It erases the graphics device display. */
#include "sys-defines.h"
#include "plot.h"
#include "extern.h"
int
#ifdef _HAVE_PROTOS
_t_erase (void)
#else
_t_erase ()
#endif
{
if (!_plotter->open)
{
_plotter->error ("erase: invalid operation");
return -1;
}
_plotter->endpath (); /* flush polyline if any (could simply
interrupt it in mid-assemblage) */
if (_plotter->outstream)
fputs ("\033\014", _plotter->outstream); /* ASCII ESC C-l, i.e. ^[^l */
_plotter->mode = MODE_ALPHA; /* erase enters alpha mode */
/* Note: kermit Tek emulator seems to enter graphics mode on seeing ESC
C-l , not alpha mode. Maybe we should specify MODE_PLOT above,
instead of MODE_ALPHA? The above won't hurt though, because we don't
use MODE_ALPHA anyway (we'll have to switch away from it). */
if (_plotter->outstream)
fflush (_plotter->outstream);
#ifdef GENUINE_TEKTRONIX
if (_plotter->display_type == D_GENERIC)
sleep(1); /* give storage tube time to clear */
#endif
return 0;
}
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