trek/torped.c

   1 /*      $NetBSD: torped.c,v 1.7 2003/08/07 09:37:54 agc 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 1.7 2003/08/07 09:37:54 agc 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 __P((int));
  67
  68 /*ARGSUSED*/
  69 void
  70 torped(v)
  71         int v __attribute__((__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 }