1 /* $NetBSD: torped.c,v 1.14 2009/05/24 23:20:22 dholland Exp $ */
2
3 /*
4 * Copyright (c) 1980, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #include <sys/cdefs.h>
33 #ifndef lint
34 #if 0
35 static char sccsid[] = "@(#)torped.c 8.1 (Berkeley) 5/31/93";
36 #else
37 __RCSID("$NetBSD: torped.c,v 1.14 2009/05/24 23:20:22 dholland Exp $");
38 #endif
39 #endif /* not lint */
40
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <math.h>
44 #include "trek.h"
45 #include "getpar.h"
46
47 /*
48 ** PHOTON TORPEDO CONTROL
49 **
50 ** Either one or three photon torpedoes are fired. If three
51 ** are fired, it is called a "burst" and you also specify
52 ** a spread angle.
53 **
54 ** Torpedoes are never 100% accurate. There is always a random
55 ** cludge factor in their course which is increased if you have
56 ** your shields up. Hence, you will find that they are more
57 ** accurate at close range. However, they have the advantage that
58 ** at long range they don't lose any of their power as phasers
59 ** do, i.e., a hit is a hit is a hit, by any other name.
60 **
61 ** When the course spreads too much, you get a misfire, and the
62 ** course is randomized even more. You also have the chance that
63 ** the misfire damages your torpedo tubes.
64 */
65
66 static int randcourse(int);
67
68 /*ARGSUSED*/
69 void
torped(int v __unused)70 torped(int v __unused)
71 {
72 int ix, iy;
73 double x, y, dx, dy;
74 double angle;
75 int course, course2;
76 int k;
77 double bigger;
78 double sectsize;
79 int burst;
80 int n;
81
82 if (Ship.cloaked) {
83 printf("Federation regulations do not permit attack while "
84 "cloaked.\n");
85 return;
86 }
87 if (check_out(TORPED))
88 return;
89 if (Ship.torped <= 0) {
90 printf("All photon torpedos expended\n");
91 return;
92 }
93
94 /* get the course */
95 course = getintpar("Torpedo course");
96 if (course < 0 || course > 360)
97 return;
98 burst = -1;
99
100 /* need at least three torpedoes for a burst */
101 if (Ship.torped < 3) {
102 printf("No-burst mode selected\n");
103 burst = 0;
104 } else {
105 /* see if the user wants one */
106 if (!testnl()) {
107 k = ungetc(getchar(), stdin);
108 if (k >= '0' && k <= '9')
109 burst = 1;
110 }
111 }
112 if (burst < 0) {
113 burst = getynpar("Do you want a burst");
114 }
115 if (burst) {
116 burst = getintpar("burst angle");
117 if (burst <= 0)
118 return;
119 if (burst > 15) {
120 printf("Maximum burst angle is 15 degrees\n");
121 return;
122 }
123 }
124 sectsize = NSECTS;
125 n = -1;
126 if (burst) {
127 n = 1;
128 course -= burst;
129 }
130 for (; n && n <= 3; n++) {
131 /* select a nice random course */
132 course2 = course + randcourse(n);
133 /* convert to radians */
134 angle = course2 * 0.0174532925;
135 dx = -cos(angle);
136 dy = sin(angle);
137 bigger = fabs(dx);
138 x = fabs(dy);
139 if (x > bigger)
140 bigger = x;
141 dx /= bigger;
142 dy /= bigger;
143 x = Ship.sectx + 0.5;
144 y = Ship.secty + 0.5;
145 if (Ship.cond != DOCKED)
146 Ship.torped -= 1;
147 printf("Torpedo track");
148 if (n > 0)
149 printf(", torpedo number %d", n);
150 printf(":\n%6.1f\t%4.1f\n", x, y);
151 while (1) {
152 ix = x += dx;
153 iy = y += dy;
154 if (x < 0.0 || x >= sectsize ||
155 y < 0.0 || y >= sectsize) {
156 printf("Torpedo missed\n");
157 break;
158 }
159 printf("%6.1f\t%4.1f\n", x, y);
160 switch (Sect[ix][iy]) {
161 case EMPTY:
162 continue;
163
164 case HOLE:
165 printf("Torpedo disappears into a black "
166 "hole\n");
167 break;
168
169 case KLINGON:
170 for (k = 0; k < Etc.nkling; k++) {
171 if (Etc.klingon[k].x != ix ||
172 Etc.klingon[k].y != iy)
173 continue;
174 Etc.klingon[k].power -= 500 + ranf(501);
175 if (Etc.klingon[k].power > 0) {
176 printf("*** Hit on Klingon at "
177 "%d,%d: extensive "
178 "damages\n",
179 ix, iy);
180 break;
181 }
182 killk(ix, iy);
183 break;
184 }
185 break;
186
187 case STAR:
188 nova(ix, iy);
189 break;
190
191 case INHABIT:
192 kills(ix, iy, -1);
193 break;
194
195 case BASE:
196 killb(Ship.quadx, Ship.quady);
197 Game.killb += 1;
198 break;
199
200 default:
201 printf("Unknown object %c at %d,%d destroyed\n",
202 Sect[ix][iy], ix, iy);
203 Sect[ix][iy] = EMPTY;
204 break;
205 }
206 break;
207 }
208 if (damaged(TORPED) || Quad[Ship.quadx][Ship.quady].stars < 0)
209 break;
210 course += burst;
211 }
212 Move.free = 0;
213 }
214
215
216 /*
217 ** RANDOMIZE COURSE
218 **
219 ** This routine randomizes the course for torpedo number 'n'.
220 ** Other things handled by this routine are misfires, damages
221 ** to the tubes, etc.
222 */
223
224 static int
randcourse(int n)225 randcourse(int n)
226 {
227 double r;
228 int d;
229
230 d = ((franf() + franf()) - 1.0) * 20;
231 if (abs(d) > 12) {
232 printf("Photon tubes misfire");
233 if (n < 0)
234 printf("\n");
235 else
236 printf(" on torpedo %d\n", n);
237 if (ranf(2)) {
238 damage(TORPED, 0.2 * abs(d) * (franf() + 1.0));
239 }
240 d *= 1.0 + 2.0 * franf();
241 }
242 if (Ship.shldup || Ship.cond == DOCKED) {
243 r = Ship.shield;
244 r = 1.0 + r / Param.shield;
245 if (Ship.cond == DOCKED)
246 r = 2.0;
247 d *= r;
248 }
249 return (d);
250 }
251