initial import of 386bsd-0.1 sources

1 files changed, 112 insertions, 0 deletions

diff --git a/trek/compkl.c b/trek/compkl.c
new file mode 100644
index 00000000..ad1d61cf
--- /dev/null
+++ b/trek/compkl.c
@@ -0,0 +1,112 @@
+/*
+ * Copyright (c) 1980 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)compkl.c	5.4 (Berkeley) 6/1/90";
+#endif /* not lint */
+
+# include	"trek.h"
+
+/*
+**  compute klingon distances
+**
+**	The klingon list has the distances for all klingons recomputed
+**	and sorted.  The parameter is a Boolean flag which is set if
+**	we have just entered a new quadrant.
+**
+**	This routine is used every time the Enterprise or the Klingons
+**	move.
+*/
+
+compkldist(f)
+int	f;		/* set if new quadrant */
+{
+	register int		i, dx, dy;
+	double			d;
+	double			temp;
+
+	if (Etc.nkling == 0)
+		return;
+	for (i = 0; i < Etc.nkling; i++)
+	{
+		/* compute distance to the Klingon */
+		dx = Ship.sectx - Etc.klingon[i].x;
+		dy = Ship.secty - Etc.klingon[i].y;
+		d = dx * dx + dy * dy;
+		d = sqrt(d);
+
+		/* compute average of new and old distances to Klingon */
+		if (!f)
+		{
+			temp = Etc.klingon[i].dist;
+			Etc.klingon[i].avgdist = 0.5 * (temp + d);
+		}
+		else
+		{
+			/* new quadrant: average is current */
+			Etc.klingon[i].avgdist = d;
+		}
+		Etc.klingon[i].dist = d;
+	}
+
+	/* leave them sorted */
+	sortkl();
+}
+
+
+/*
+**  sort klingons
+**
+**	bubble sort on ascending distance
+*/
+
+sortkl()
+{
+	struct kling		t;
+	register int		f, i, m;
+
+	m = Etc.nkling - 1;
+	f = 1;
+	while (f)
+	{
+		f = 0;
+		for (i = 0; i < m; i++)
+			if (Etc.klingon[i].dist > Etc.klingon[i+1].dist)
+			{
+				bmove(&Etc.klingon[i], &t, sizeof t);
+				bmove(&Etc.klingon[i+1], &Etc.klingon[i], sizeof t);
+				bmove(&t, &Etc.klingon[i+1], sizeof t);
+				f = 1;
+			}
+	}
+}