Initial revision

git-svn-id: file:///srv/svn/joey/bsdgames-trunk@5086 a4a2c43b-8ac3-0310-8836-e0e880c912e2
2025-12-20 19:04:49 +00:00 · 1999-09-08 23:56:51 +00:00
commit 03272d67da
623 changed files with 243457 additions and 0 deletions
--- a/trek/compkl.c
+++ b/trek/compkl.c
@@ -0,0 +1,124 @@
+/*	$NetBSD: compkl.c,v 1.4 1997/10/12 21:24:33 christos Exp $	*/
+
+/*
+ * Copyright (c) 1980, 1993
+ *	The 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.
+ */
+
+#include <sys/cdefs.h>
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)compkl.c	8.1 (Berkeley) 5/31/93";
+#else
+__RCSID("$NetBSD: compkl.c,v 1.4 1997/10/12 21:24:33 christos Exp $");
+#endif
+#endif /* not lint */
+
+#include <math.h>
+#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.
+*/
+
+static void sortkl __P((void));
+
+void
+compkldist(f)
+int	f;		/* set if new quadrant */
+{
+	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
+*/
+
+static void
+sortkl()
+{
+	struct kling		t;
+	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)
+			{
+				t =  Etc.klingon[i];
+				Etc.klingon[i] = Etc.klingon[i+1];
+				Etc.klingon[i+1] = t;
+				f = 1;
+			}
+	}
+}