Add the DragonFly cvs id and perform general cleanups on cvs/rcs/sccs ids. Most
[dragonfly.git] / games / trek / compkl.c
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1/*
2 * Copyright (c) 1980, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by the University of
16 * California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
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32 *
33 * @(#)compkl.c 8.1 (Berkeley) 5/31/93
34 * $FreeBSD: src/games/trek/compkl.c,v 1.4 1999/11/30 03:49:44 billf Exp $
35 * $DragonFly: src/games/trek/compkl.c,v 1.2 2003/06/17 04:25:25 dillon Exp $
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36 */
37
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38# include "trek.h"
39
40/*
41** compute klingon distances
42**
43** The klingon list has the distances for all klingons recomputed
44** and sorted. The parameter is a Boolean flag which is set if
45** we have just entered a new quadrant.
46**
47** This routine is used every time the Enterprise or the Klingons
48** move.
49*/
50
51compkldist(f)
52int f; /* set if new quadrant */
53{
54 int i, dx, dy;
55 double d;
56 double temp;
57
58 if (Etc.nkling == 0)
59 return;
60 for (i = 0; i < Etc.nkling; i++)
61 {
62 /* compute distance to the Klingon */
63 dx = Ship.sectx - Etc.klingon[i].x;
64 dy = Ship.secty - Etc.klingon[i].y;
65 d = dx * dx + dy * dy;
66 d = sqrt(d);
67
68 /* compute average of new and old distances to Klingon */
69 if (!f)
70 {
71 temp = Etc.klingon[i].dist;
72 Etc.klingon[i].avgdist = 0.5 * (temp + d);
73 }
74 else
75 {
76 /* new quadrant: average is current */
77 Etc.klingon[i].avgdist = d;
78 }
79 Etc.klingon[i].dist = d;
80 }
81
82 /* leave them sorted */
83 sortkl();
84}
85
86
87/*
88** sort klingons
89**
90** bubble sort on ascending distance
91*/
92
93sortkl()
94{
95 struct kling t;
96 int f, i, m;
97
98 m = Etc.nkling - 1;
99 f = 1;
100 while (f)
101 {
102 f = 0;
103 for (i = 0; i < m; i++)
104 if (Etc.klingon[i].dist > Etc.klingon[i+1].dist)
105 {
106 bmove(&Etc.klingon[i], &t, sizeof t);
107 bmove(&Etc.klingon[i+1], &Etc.klingon[i], sizeof t);
108 bmove(&t, &Etc.klingon[i+1], sizeof t);
109 f = 1;
110 }
111 }
112}