games/trek/torped.c

   1 /*      $NetBSD: torped.c,v 1.13 2009/05/24 22:55:03 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 1.13 2009/05/24 22:55:03 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
  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
 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 }