From fa080de7afc95aa1c19a6e6fc0e0708ced2eadc4 Mon Sep 17 00:00:00 2001
From: Joseph Hunkeler <jhunkeler@gmail.com>
Date: Wed, 8 Jul 2015 20:46:52 -0400
Subject: Initial commit

---
 sys/gio/imdkern/imdclear.x | 55 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 sys/gio/imdkern/imdclear.x

(limited to 'sys/gio/imdkern/imdclear.x')

diff --git a/sys/gio/imdkern/imdclear.x b/sys/gio/imdkern/imdclear.x
new file mode 100644
index 00000000..bf471998
--- /dev/null
+++ b/sys/gio/imdkern/imdclear.x
@@ -0,0 +1,55 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<mach.h>
+include	"imd.h"
+
+# IMD_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 imd_clear (dummy)
+
+int	dummy			# not used at present
+
+int	idk_open()
+errchk	idk_open
+include	"imd.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 issuing the frame advance
+	# instruction 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 (IMD_ENDFRAME(g_kt) == YES)
+		call idk_frame (g_out)
+
+	    g_nframes = 0
+	    call idk_close (g_out)
+	    #g_out = idk_open (Memc[IMD_DEVNAME(g_kt)], g_tty)
+	    g_out = idk_open (g_frame, g_color, g_tty)
+
+	    # Does this device require a frame advance at beginning of metafile?
+	    if (IMD_STARTFRAME(g_kt) == YES)
+		call idk_frame (g_out)
+
+	} else {
+	    # Merely output frame instruction to start a new frame in the same
+	    # metafile.
+
+	    call idk_frame (g_out)
+	}
+
+	# Init kernel data structures.
+	call imd_reset()
+	g_ndraw = 0
+end
-- 
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