1 files changed, 57 insertions, 0 deletions
diff --git a/usr/src/ucbcmd/plot/libplot/dumb/subr.c b/usr/src/ucbcmd/plot/libplot/dumb/subr.c
new file mode 100644
index 0000000000..102c483878
--- /dev/null
+++ b/usr/src/ucbcmd/plot/libplot/dumb/subr.c
@@ -0,0 +1,57 @@
+/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
+/*	  All Rights Reserved  	*/
+
+
+#ident	"%Z%%M%	%I%	%E% SMI"	/* SVr4.0 1.1	*/
+
+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved. The Berkeley software License Agreement
+ * specifies the terms and conditions for redistribution.
+ */
+
+/*
+ * Copyright (c) 1983, 1984 1985, 1986, 1987, 1988, Sun Microsystems, Inc.
+ * All Rights Reserved.
+ */
+
+
+#include "dumb.h"
+
+/* Does not plot first point -- assumed that it is already plotted */
+dda_line(ch, x0, y0, x1, y1)
+	char ch;
+	int x0, y0;	/* already transformed to screen coords */
+	int x1, y1;	/* untransformed */
+{
+	int length, i;
+	double deltaX, deltaY;
+	double x, y;
+	double floor();
+	int abs();
+
+	scale(x1, y1);
+
+	length = abs(x1 - x0);
+	if (abs(y1 -y0) > length)
+		length = abs(y1 - y0);
+
+	if (length == 0)
+		return;
+
+	deltaX = (double) (x1 - x0)/(double) length;
+	deltaY = (double) (y1 - y0)/(double) length;
+
+	x = (double) x0 + 0.5;
+	y = (double) y0 + 0.5;
+
+	for (i=0; i < length; ++i) {
+		x += deltaX;
+		y += deltaY;
+		x0 = floor(x);
+		y0 = floor(y);
+		currentx = x0;
+		currenty = y0;
+		screenmat[currentx][currenty] = ch;
+	}
+}