1 /* $OpenBSD: attack.c,v 1.8 2016/01/07 14:37:51 mestre Exp $ */
2 /* $NetBSD: attack.c,v 1.3 1995/04/22 10:58:26 cgd Exp $ */
3
4 /*
5 * Copyright (c) 1980, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #include <math.h>
34 #include <stdio.h>
35
36 #include "trek.h"
37
38 /*
39 ** Klingon Attack Routine
40 **
41 ** This routine performs the Klingon attack provided that
42 ** (1) Something happened this move (i.e., not free), and
43 ** (2) You are not cloaked. Note that if you issue the
44 ** cloak command, you are not considered cloaked until you
45 ** expend some time.
46 **
47 ** Klingons are permitted to move both before and after the
48 ** attack. They will tend to move toward you before the
49 ** attack and away from you after the attack.
50 **
51 ** Under certain conditions you can get a critical hit. This
52 ** sort of hit damages devices. The probability that a given
53 ** device is damaged depends on the device. Well protected
54 ** devices (such as the computer, which is in the core of the
55 ** ship and has considerable redundancy) almost never get
56 ** damaged, whereas devices which are exposed (such as the
57 ** warp engines) or which are particularly delicate (such as
58 ** the transporter) have a much higher probability of being
59 ** damaged.
60 **
61 ** The actual amount of damage (i.e., how long it takes to fix
62 ** it) depends on the amount of the hit and the "damfac[]"
63 ** entry for the particular device.
64 **
65 ** Casualties can also occur.
66 */
67
68 /* argument is set if attack while resting */
69 void
attack(int resting)70 attack(int resting)
71 {
72 int hit, i, l;
73 int maxhit, tothit, shldabsb;
74 double chgfac, propor, extradm;
75 double dustfac, tothe;
76 int cas;
77 int hitflag;
78
79 if (Move.free)
80 return;
81 if (Etc.nkling <= 0 || Quad[Ship.quadx][Ship.quady].stars < 0)
82 return;
83 if (Ship.cloaked && Ship.cloakgood)
84 return;
85 /* move before attack */
86 klmove(0);
87 if (Ship.cond == DOCKED)
88 {
89 if (!resting)
90 printf("Starbase shields protect the %s\n", Ship.shipname);
91 return;
92 }
93 /* setup shield effectiveness */
94 chgfac = 1.0;
95 if (Move.shldchg)
96 chgfac = 0.25 + 0.50 * franf();
97 maxhit = tothit = 0;
98 hitflag = 0;
99
100 /* let each Klingon do his damndest */
101 for (i = 0; i < Etc.nkling; i++)
102 {
103 /* if he's low on power he won't attack */
104 if (Etc.klingon[i].power < 20)
105 continue;
106 if (!hitflag)
107 {
108 printf("\nStardate %.2f: Klingon attack:\n",
109 Now.date);
110 hitflag++;
111 }
112 /* complete the hit */
113 dustfac = 0.90 + 0.01 * franf();
114 tothe = Etc.klingon[i].avgdist;
115 hit = Etc.klingon[i].power * pow(dustfac, tothe) * Param.hitfac;
116 /* deplete his energy */
117 dustfac = Etc.klingon[i].power;
118 Etc.klingon[i].power = dustfac * Param.phasfac * (1.0 + (franf() - 0.5) * 0.2);
119 /* see how much of hit shields will absorb */
120 shldabsb = 0;
121 if (Ship.shldup || Move.shldchg)
122 {
123 propor = Ship.shield;
124 propor /= Param.shield;
125 shldabsb = propor * chgfac * hit;
126 if (shldabsb > Ship.shield)
127 shldabsb = Ship.shield;
128 Ship.shield -= shldabsb;
129 }
130 /* actually do the hit */
131 printf("\aHIT: %d units", hit);
132 if (!damaged(SRSCAN))
133 printf(" from %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
134 cas = (shldabsb * 100) / hit;
135 hit -= shldabsb;
136 if (shldabsb > 0)
137 printf(", shields absorb %d%%, effective hit %d\n",
138 cas, hit);
139 else
140 printf("\n");
141 tothit += hit;
142 if (hit > maxhit)
143 maxhit = hit;
144 Ship.energy -= hit;
145 /* see if damages occurred */
146 if (hit >= (15 - Game.skill) * (25 - ranf(12)))
147 {
148 printf("\aCRITICAL HIT!!!\a\n");
149 /* select a device from probability vector */
150 cas = ranf(1000);
151 for (l = 0; cas >= 0; l++)
152 cas -= Param.damprob[l];
153 l -= 1;
154 /* compute amount of damage */
155 extradm = (hit * Param.damfac[l]) / (75 + ranf(25)) + 0.5;
156 /* damage the device */
157 damage(l, extradm);
158 if (damaged(SHIELD))
159 {
160 if (Ship.shldup)
161 printf("Sulu: Shields knocked down, captain.\n");
162 Ship.shldup = 0;
163 Move.shldchg = 0;
164 }
165 }
166 if (Ship.energy <= 0)
167 lose(L_DSTRYD);
168 }
169
170 /* see what our casualities are like */
171 if (maxhit >= 200 || tothit >= 500)
172 {
173 cas = tothit * 0.015 * franf();
174 if (cas >= 2)
175 {
176 printf("McCoy: we suffered %d casualties in that attack.\n",
177 cas);
178 Game.deaths += cas;
179 Ship.crew -= cas;
180 }
181 }
182
183 /* allow Klingons to move after attacking */
184 klmove(1);
185 }
186