trek/torped.c

   1 /*      $NetBSD: torped.c,v 1.3 1995/04/22 10:59:34 cgd 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. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by the University of
  18  *      California, Berkeley and its contributors.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #ifndef lint
  37 #if 0
  38 static char sccsid[] = "@(#)torped.c    8.1 (Berkeley) 5/31/93";
  39 #else
  40 static char rcsid[] = "$NetBSD: torped.c,v 1.3 1995/04/22 10:59:34 cgd Exp $";
  41 #endif
  42 #endif /* not lint */
  43
  44 # include       <stdio.h>
  45 # include       "trek.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
  67 torped()
  68 {
  69         register int            ix, iy;
  70         double                  x, y, dx, dy;
  71         double                  angle;
  72         int                     course, course2;
  73         register int            k;
  74         double                  bigger;
  75         double                  sectsize;
  76         int                     burst;
  77         int                     n;
  78
  79         if (Ship.cloaked)
  80         {
  81                 return (printf("Federation regulations do not permit attack while cloaked.\n"));
  82         }
  83         if (check_out(TORPED))
  84                 return;
  85         if (Ship.torped <= 0)
  86         {
  87                 return (printf("All photon torpedos expended\n"));
  88         }
  89
  90         /* get the course */
  91         course = getintpar("Torpedo course");
  92         if (course < 0 || course > 360)
  93                 return;
  94         burst = -1;
  95
  96         /* need at least three torpedoes for a burst */
  97         if (Ship.torped < 3)
  98         {
  99                 printf("No-burst mode selected\n");
 100                 burst = 0;
 101         }
 102         else
 103         {
 104                 /* see if the user wants one */
 105                 if (!testnl())
 106                 {
 107                         k = ungetc(cgetc(0), stdin);
 108                         if (k >= '0' && k <= '9')
 109                                 burst = 1;
 110                 }
 111         }
 112         if (burst < 0)
 113         {
 114                 burst = getynpar("Do you want a burst");
 115         }
 116         if (burst)
 117         {
 118                 burst = getintpar("burst angle");
 119                 if (burst <= 0)
 120                         return;
 121                 if (burst > 15)
 122                         return (printf("Maximum burst angle is 15 degrees\n"));
 123         }
 124         sectsize = NSECTS;
 125         n = -1;
 126         if (burst)
 127         {
 128                 n = 1;
 129                 course -= burst;
 130         }
 131         for (; n && n <= 3; n++)
 132         {
 133                 /* select a nice random course */
 134                 course2 = course + randcourse(n);
 135                 angle = course2 * 0.0174532925;                 /* convert to radians */
 136                 dx = -cos(angle);
 137                 dy =  sin(angle);
 138                 bigger = fabs(dx);
 139                 x = fabs(dy);
 140                 if (x > bigger)
 141                         bigger = x;
 142                 dx /= bigger;
 143                 dy /= bigger;
 144                 x = Ship.sectx + 0.5;
 145                 y = Ship.secty + 0.5;
 146                 if (Ship.cond != DOCKED)
 147                         Ship.torped -= 1;
 148                 printf("Torpedo track");
 149                 if (n > 0)
 150                         printf(", torpedo number %d", n);
 151                 printf(":\n%6.1f\t%4.1f\n", x, y);
 152                 while (1)
 153                 {
 154                         ix = x += dx;
 155                         iy = y += dy;
 156                         if (x < 0.0 || x >= sectsize || y < 0.0 || y >= sectsize)
 157                         {
 158                                 printf("Torpedo missed\n");
 159                                 break;
 160                         }
 161                         printf("%6.1f\t%4.1f\n", x, y);
 162                         switch (Sect[ix][iy])
 163                         {
 164                           case EMPTY:
 165                                 continue;
 166
 167                           case HOLE:
 168                                 printf("Torpedo disappears into a black hole\n");
 169                                 break;
 170
 171                           case KLINGON:
 172                                 for (k = 0; k < Etc.nkling; k++)
 173                                 {
 174                                         if (Etc.klingon[k].x != ix || Etc.klingon[k].y != iy)
 175                                                 continue;
 176                                         Etc.klingon[k].power -= 500 + ranf(501);
 177                                         if (Etc.klingon[k].power > 0)
 178                                         {
 179                                                 printf("*** Hit on Klingon at %d,%d: extensive damages\n",
 180                                                         ix, iy);
 181                                                 break;
 182                                         }
 183                                         killk(ix, iy);
 184                                         break;
 185                                 }
 186                                 break;
 187
 188                           case STAR:
 189                                 nova(ix, iy);
 190                                 break;
 191
 192                           case INHABIT:
 193                                 kills(ix, iy, -1);
 194                                 break;
 195
 196                           case BASE:
 197                                 killb(Ship.quadx, Ship.quady);
 198                                 Game.killb += 1;
 199                                 break;
 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 randcourse(n)
 225 int     n;
 226 {
 227         double                  r;
 228         register int            d;
 229
 230         d = ((franf() + franf()) - 1.0) * 20;
 231         if (abs(d) > 12)
 232         {
 233                 printf("Photon tubes misfire");
 234                 if (n < 0)
 235                         printf("\n");
 236                 else
 237                         printf(" on torpedo %d\n", n);
 238                 if (ranf(2))
 239                 {
 240                         damage(TORPED, 0.2 * abs(d) * (franf() + 1.0));
 241                 }
 242                 d *= 1.0 + 2.0 * franf();
 243         }
 244         if (Ship.shldup || Ship.cond == DOCKED)
 245         {
 246                 r = Ship.shield;
 247                 r = 1.0 + r / Param.shield;
 248                 if (Ship.cond == DOCKED)
 249                         r = 2.0;
 250                 d *= r;
 251         }
 252         return (d);
 253 }