121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/* $NetBSD: compkl.c,v 1.6 2004/01/27 20:30:30 jsm Exp $ */
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/*
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* Copyright (c) 1980, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)compkl.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: compkl.c,v 1.6 2004/01/27 20:30:30 jsm Exp $");
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#endif
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#endif /* not lint */
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#include <math.h>
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#include "trek.h"
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/*
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** compute klingon distances
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**
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** The klingon list has the distances for all klingons recomputed
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** and sorted. The parameter is a Boolean flag which is set if
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** we have just entered a new quadrant.
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**
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** This routine is used every time the Enterprise or the Klingons
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** move.
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*/
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static void sortkl(void);
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void
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compkldist(f)
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int f; /* set if new quadrant */
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{
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int i, dx, dy;
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double d;
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double temp;
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if (Etc.nkling == 0)
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return;
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for (i = 0; i < Etc.nkling; i++)
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{
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/* compute distance to the Klingon */
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dx = Ship.sectx - Etc.klingon[i].x;
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dy = Ship.secty - Etc.klingon[i].y;
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d = dx * dx + dy * dy;
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d = sqrt(d);
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/* compute average of new and old distances to Klingon */
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if (!f)
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{
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temp = Etc.klingon[i].dist;
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Etc.klingon[i].avgdist = 0.5 * (temp + d);
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}
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else
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{
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/* new quadrant: average is current */
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Etc.klingon[i].avgdist = d;
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}
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Etc.klingon[i].dist = d;
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}
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/* leave them sorted */
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sortkl();
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}
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/*
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** sort klingons
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**
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** bubble sort on ascending distance
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*/
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static void
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sortkl()
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{
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struct kling t;
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int f, i, m;
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m = Etc.nkling - 1;
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f = 1;
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while (f)
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{
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f = 0;
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for (i = 0; i < m; i++)
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if (Etc.klingon[i].dist > Etc.klingon[i+1].dist)
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{
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t = Etc.klingon[i];
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Etc.klingon[i] = Etc.klingon[i+1];
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Etc.klingon[i+1] = t;
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f = 1;
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}
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}
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}
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