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# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
include <mach.h>
include "gkt.h"
# GKT_CLEAR -- Advance a frame on the plotter. All attribute packets are
# initialized to their default values. Redundant calls or calls immediately
# after a workstation open (before anything has been drawn) are ignored.
procedure gkt_clear (dummy)
int dummy # not used at present
int gkt_mfopen()
errchk gkt_mfopen
include "gkt.com"
begin
# This is a no-op if nothing has been drawn.
if (g_kt == NULL || g_ndraw == 0)
return
# Start a new frame. This is done either by calling NSPP to do a frame
# advance or by starting a new metafile. Close the output file and
# start a new metafile if the maximum frame count has been reached.
# This disposes of the metafile to the system, causing the actual
# plots to be drawn. Open a new metafile ready to receive next frame.
g_nframes = g_nframes + 1
if (g_nframes >= g_maxframes) {
# Does this device require a frame advance at end of metafile?
if (GKT_ENDFRAME(g_kt) == YES)
call frame()
# The call to the NSPP flush procedure must be escaped to avoid
# interpretation as the FIO flush procedure.
% call mcflsh
g_nframes = 0
call close (g_out)
g_out = gkt_mfopen (g_tty, NEW_FILE)
# Does this device require a frame advance at beginning of metafile?
if (GKT_STARTFRAME(g_kt) == YES)
call frame()
} else {
# Merely output NSPP frame instruction to start a new frame in
# the same metafile.
call frame()
}
# Init kernel data structures.
call gkt_reset()
g_ndraw = 0
end
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