1 /* $NetBSD: torped.c,v 1.9 2007/12/15 19:44:45 perry 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 1.9 2007/12/15 19:44:45 perry 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 70 torped(v) 71 int v __unused; 72 { 73 int ix, iy; 74 double x, y, dx, dy; 75 double angle; 76 int course, course2; 77 int k; 78 double bigger; 79 double sectsize; 80 int burst; 81 int n; 82 83 if (Ship.cloaked) 84 { 85 printf("Federation regulations do not permit attack while cloaked.\n"); 86 return; 87 } 88 if (check_out(TORPED)) 89 return; 90 if (Ship.torped <= 0) 91 { 92 printf("All photon torpedos expended\n"); 93 return; 94 } 95 96 /* get the course */ 97 course = getintpar("Torpedo course"); 98 if (course < 0 || course > 360) 99 return; 100 burst = -1; 101 102 /* need at least three torpedoes for a burst */ 103 if (Ship.torped < 3) 104 { 105 printf("No-burst mode selected\n"); 106 burst = 0; 107 } 108 else 109 { 110 /* see if the user wants one */ 111 if (!testnl()) 112 { 113 k = ungetc(cgetc(0), stdin); 114 if (k >= '0' && k <= '9') 115 burst = 1; 116 } 117 } 118 if (burst < 0) 119 { 120 burst = getynpar("Do you want a burst"); 121 } 122 if (burst) 123 { 124 burst = getintpar("burst angle"); 125 if (burst <= 0) 126 return; 127 if (burst > 15) { 128 printf("Maximum burst angle is 15 degrees\n"); 129 return; 130 } 131 } 132 sectsize = NSECTS; 133 n = -1; 134 if (burst) 135 { 136 n = 1; 137 course -= burst; 138 } 139 for (; n && n <= 3; n++) 140 { 141 /* select a nice random course */ 142 course2 = course + randcourse(n); 143 angle = course2 * 0.0174532925; /* convert to radians */ 144 dx = -cos(angle); 145 dy = sin(angle); 146 bigger = fabs(dx); 147 x = fabs(dy); 148 if (x > bigger) 149 bigger = x; 150 dx /= bigger; 151 dy /= bigger; 152 x = Ship.sectx + 0.5; 153 y = Ship.secty + 0.5; 154 if (Ship.cond != DOCKED) 155 Ship.torped -= 1; 156 printf("Torpedo track"); 157 if (n > 0) 158 printf(", torpedo number %d", n); 159 printf(":\n%6.1f\t%4.1f\n", x, y); 160 while (1) 161 { 162 ix = x += dx; 163 iy = y += dy; 164 if (x < 0.0 || x >= sectsize || y < 0.0 || y >= sectsize) 165 { 166 printf("Torpedo missed\n"); 167 break; 168 } 169 printf("%6.1f\t%4.1f\n", x, y); 170 switch (Sect[ix][iy]) 171 { 172 case EMPTY: 173 continue; 174 175 case HOLE: 176 printf("Torpedo disappears into a black hole\n"); 177 break; 178 179 case KLINGON: 180 for (k = 0; k < Etc.nkling; k++) 181 { 182 if (Etc.klingon[k].x != ix || Etc.klingon[k].y != iy) 183 continue; 184 Etc.klingon[k].power -= 500 + ranf(501); 185 if (Etc.klingon[k].power > 0) 186 { 187 printf("*** Hit on Klingon at %d,%d: extensive damages\n", 188 ix, iy); 189 break; 190 } 191 killk(ix, iy); 192 break; 193 } 194 break; 195 196 case STAR: 197 nova(ix, iy); 198 break; 199 200 case INHABIT: 201 kills(ix, iy, -1); 202 break; 203 204 case BASE: 205 killb(Ship.quadx, Ship.quady); 206 Game.killb += 1; 207 break; 208 default: 209 printf("Unknown object %c at %d,%d destroyed\n", 210 Sect[ix][iy], ix, iy); 211 Sect[ix][iy] = EMPTY; 212 break; 213 } 214 break; 215 } 216 if (damaged(TORPED) || Quad[Ship.quadx][Ship.quady].stars < 0) 217 break; 218 course += burst; 219 } 220 Move.free = 0; 221 } 222 223 224 /* 225 ** RANDOMIZE COURSE 226 ** 227 ** This routine randomizes the course for torpedo number 'n'. 228 ** Other things handled by this routine are misfires, damages 229 ** to the tubes, etc. 230 */ 231 232 static int 233 randcourse(n) 234 int n; 235 { 236 double r; 237 int d; 238 239 d = ((franf() + franf()) - 1.0) * 20; 240 if (abs(d) > 12) 241 { 242 printf("Photon tubes misfire"); 243 if (n < 0) 244 printf("\n"); 245 else 246 printf(" on torpedo %d\n", n); 247 if (ranf(2)) 248 { 249 damage(TORPED, 0.2 * abs(d) * (franf() + 1.0)); 250 } 251 d *= 1.0 + 2.0 * franf(); 252 } 253 if (Ship.shldup || Ship.cond == DOCKED) 254 { 255 r = Ship.shield; 256 r = 1.0 + r / Param.shield; 257 if (Ship.cond == DOCKED) 258 r = 2.0; 259 d *= r; 260 } 261 return (d); 262 } 263