games: Massive style(9) cleanup commit. Reduces differences to NetBSD.
[dragonfly.git] / games / trek / move.c
CommitLineData
6693db17 1/*-
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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.
6693db17 13 * 3. Neither the name of the University nor the names of its contributors
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14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
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28 *
29 * @(#)move.c 8.1 (Berkeley) 5/31/93
30 * $FreeBSD: src/games/trek/move.c,v 1.6 1999/11/30 03:49:50 billf Exp $
ac79378f 31 * $DragonFly: src/games/trek/move.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
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32 */
33
6693db17 34#include "trek.h"
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35
36/*
37** Move Under Warp or Impulse Power
38**
39** `Ramflag' is set if we are to be allowed to ram stars,
40** Klingons, etc. This is passed from warp(), which gets it from
41** either play() or ram(). Course is the course (0 -> 360) at
42** which we want to move. `Speed' is the speed we
ac79378f 43** want to go, and `p_time' is the expected time. It
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44** can get cut short if a long range tractor beam is to occur. We
45** cut short the move so that the user doesn't get docked time and
46** energy for distance which he didn't travel.
47**
48** We check the course through the current quadrant to see that he
49** doesn't run into anything. After that, though, space sort of
50** bends around him. Note that this puts us in the awkward posi-
51** tion of being able to be dropped into a sector which is com-
52** pletely surrounded by stars. Oh Well.
53**
54** If the SINS (Space Inertial Navigation System) is out, we ran-
55** domize the course accordingly before ever starting to move.
56** We will still move in a straight line.
57**
58** Note that if your computer is out, you ram things anyway. In
59** other words, if your computer and sins are both out, you're in
60** potentially very bad shape.
61**
62** Klingons get a chance to zap you as you leave the quadrant.
63** By the way, they also try to follow you (heh heh).
64**
65** Return value is the actual amount of time used.
66**
67**
68** Uses trace flag 4.
69*/
70
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71double
72move(int ramflag, int course, double p_time, double speed)
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73{
74 double angle;
75 double x, y, dx, dy;
76 int ix, iy;
77 double bigger;
78 int n;
79 int i;
80 double dist;
81 double sectsize;
82 double xn;
83 double evtime;
84
ac79378f 85 ix = iy = 0;
6693db17 86#ifdef xTRACE
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87 if (Trace)
88 printf("move: ramflag %d course %d time %.2f speed %.2f\n",
ac79378f 89 ramflag, course, p_time, speed);
6693db17 90#endif
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91 sectsize = NSECTS;
92 /* initialize delta factors for move */
93 angle = course * 0.0174532925;
94 if (damaged(SINS))
95 angle += Param.navigcrud[1] * (franf() - 0.5);
96 else
97 if (Ship.sinsbad)
98 angle += Param.navigcrud[0] * (franf() - 0.5);
99 dx = -cos(angle);
100 dy = sin(angle);
101 bigger = fabs(dx);
102 dist = fabs(dy);
103 if (dist > bigger)
104 bigger = dist;
105 dx /= bigger;
106 dy /= bigger;
107
108 /* check for long range tractor beams */
109 /**** TEMPORARY CODE == DEBUGGING ****/
110 evtime = Now.eventptr[E_LRTB]->date - Now.date;
6693db17 111#ifdef xTRACE
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112 if (Trace)
113 printf("E.ep = %p, ->evcode = %d, ->date = %.2f, evtime = %.2f\n",
114 (void *)Now.eventptr[E_LRTB],
115 Now.eventptr[E_LRTB]->evcode,
116 Now.eventptr[E_LRTB]->date, evtime);
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117#endif
118 if (p_time > evtime && Etc.nkling < 3) {
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119 /* then we got a LRTB */
120 evtime += 0.005;
ac79378f 121 p_time = evtime;
6693db17 122 } else
984263bc 123 evtime = -1.0e50;
ac79378f 124 dist = p_time * speed;
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125
126 /* move within quadrant */
127 Sect[Ship.sectx][Ship.secty] = EMPTY;
128 x = Ship.sectx + 0.5;
129 y = Ship.secty + 0.5;
130 xn = NSECTS * dist * bigger;
131 n = xn + 0.5;
6693db17 132#ifdef xTRACE
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133 if (Trace)
134 printf("dx = %.2f, dy = %.2f, xn = %.2f, n = %d\n", dx, dy, xn, n);
6693db17 135#endif
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136 Move.free = 0;
137
6693db17 138 for (i = 0; i < n; i++) {
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139 ix = (x += dx);
140 iy = (y += dy);
6693db17 141#ifdef xTRACE
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142 if (Trace)
143 printf("ix = %d, x = %.2f, iy = %d, y = %.2f\n", ix, x, iy, y);
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144#endif
145 if (x < 0.0 || y < 0.0 || x >= sectsize || y >= sectsize) {
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146 /* enter new quadrant */
147 dx = Ship.quadx * NSECTS + Ship.sectx + dx * xn;
148 dy = Ship.quady * NSECTS + Ship.secty + dy * xn;
149 if (dx < 0.0)
150 ix = -1;
151 else
152 ix = dx + 0.5;
153 if (dy < 0.0)
154 iy = -1;
155 else
156 iy = dy + 0.5;
6693db17 157#ifdef xTRACE
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158 if (Trace)
159 printf("New quad: ix = %d, iy = %d\n", ix, iy);
6693db17 160#endif
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161 Ship.sectx = x;
162 Ship.secty = y;
163 compkldist(0);
164 Move.newquad = 2;
165 attack(0);
166 checkcond();
167 Ship.quadx = ix / NSECTS;
168 Ship.quady = iy / NSECTS;
169 Ship.sectx = ix % NSECTS;
170 Ship.secty = iy % NSECTS;
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171 if (ix < 0 || Ship.quadx >= NQUADS || iy < 0 ||
172 Ship.quady >= NQUADS) {
173 if (!damaged(COMPUTER)) {
984263bc 174 dumpme(0);
6693db17 175 } else
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176 lose(L_NEGENB);
177 }
178 initquad(0);
179 n = 0;
180 break;
181 }
6693db17 182 if (Sect[ix][iy] != EMPTY) {
984263bc 183 /* we just hit something */
6693db17 184 if (!damaged(COMPUTER) && ramflag <= 0) {
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185 ix = x - dx;
186 iy = y - dy;
187 printf("Computer reports navigation error; %s stopped at %d,%d\n",
188 Ship.shipname, ix, iy);
189 Ship.energy -= Param.stopengy * speed;
190 break;
191 }
192 /* test for a black hole */
6693db17 193 if (Sect[ix][iy] == HOLE) {
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194 /* get dumped elsewhere in the galaxy */
195 dumpme(1);
196 initquad(0);
197 n = 0;
198 break;
199 }
200 ram(ix, iy);
201 break;
202 }
203 }
6693db17 204 if (n > 0) {
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205 dx = Ship.sectx - ix;
206 dy = Ship.secty - iy;
207 dist = sqrt(dx * dx + dy * dy) / NSECTS;
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208 p_time = dist / speed;
209 if (evtime > p_time)
210 p_time = evtime; /* spring the LRTB trap */
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211 Ship.sectx = ix;
212 Ship.secty = iy;
213 }
214 Sect[Ship.sectx][Ship.secty] = Ship.ship;
215 compkldist(0);
ac79378f 216 return (p_time);
984263bc 217}