trek/torped.c

   1 /*
   2  * Copyright (c) 1980 Regents of the University of California.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifndef lint
  35 static char sccsid[] = "@(#)torped.c    5.4 (Berkeley) 6/1/90";
  36 #endif /* not lint */
  37
  38 # include       <stdio.h>
  39 # include       "trek.h"
  40
  41 /*
  42 **  PHOTON TORPEDO CONTROL
  43 **
  44 **      Either one or three photon torpedoes are fired.  If three
  45 **      are fired, it is called a "burst" and you also specify
  46 **      a spread angle.
  47 **
  48 **      Torpedoes are never 100% accurate.  There is always a random
  49 **      cludge factor in their course which is increased if you have
  50 **      your shields up.  Hence, you will find that they are more
  51 **      accurate at close range.  However, they have the advantage that
  52 **      at long range they don't lose any of their power as phasers
  53 **      do, i.e., a hit is a hit is a hit, by any other name.
  54 **
  55 **      When the course spreads too much, you get a misfire, and the
  56 **      course is randomized even more.  You also have the chance that
  57 **      the misfire damages your torpedo tubes.
  58 */
  59
  60
  61 torped()
  62 {
  63         register int            ix, iy;
  64         double                  x, y, dx, dy;
  65         double                  angle;
  66         int                     course, course2;
  67         register int            k;
  68         double                  bigger;
  69         double                  sectsize;
  70         int                     burst;
  71         int                     n;
  72
  73         if (Ship.cloaked)
  74         {
  75                 return (printf("Federation regulations do not permit attack while cloaked.\n"));
  76         }
  77         if (check_out(TORPED))
  78                 return;
  79         if (Ship.torped <= 0)
  80         {
  81                 return (printf("All photon torpedos expended\n"));
  82         }
  83
  84         /* get the course */
  85         course = getintpar("Torpedo course");
  86         if (course < 0 || course > 360)
  87                 return;
  88         burst = -1;
  89
  90         /* need at least three torpedoes for a burst */
  91         if (Ship.torped < 3)
  92         {
  93                 printf("No-burst mode selected\n");
  94                 burst = 0;
  95         }
  96         else
  97         {
  98                 /* see if the user wants one */
  99                 if (!testnl())
 100                 {
 101                         k = ungetc(cgetc(0), stdin);
 102                         if (k >= '0' && k <= '9')
 103                                 burst = 1;
 104                 }
 105         }
 106         if (burst < 0)
 107         {
 108                 burst = getynpar("Do you want a burst");
 109         }
 110         if (burst)
 111         {
 112                 burst = getintpar("burst angle");
 113                 if (burst <= 0)
 114                         return;
 115                 if (burst > 15)
 116                         return (printf("Maximum burst angle is 15 degrees\n"));
 117         }
 118         sectsize = NSECTS;
 119         n = -1;
 120         if (burst)
 121         {
 122                 n = 1;
 123                 course -= burst;
 124         }
 125         for (; n && n <= 3; n++)
 126         {
 127                 /* select a nice random course */
 128                 course2 = course + randcourse(n);
 129                 angle = course2 * 0.0174532925;                 /* convert to radians */
 130                 dx = -cos(angle);
 131                 dy =  sin(angle);
 132                 bigger = fabs(dx);
 133                 x = fabs(dy);
 134                 if (x > bigger)
 135                         bigger = x;
 136                 dx /= bigger;
 137                 dy /= bigger;
 138                 x = Ship.sectx + 0.5;
 139                 y = Ship.secty + 0.5;
 140                 if (Ship.cond != DOCKED)
 141                         Ship.torped -= 1;
 142                 printf("Torpedo track");
 143                 if (n > 0)
 144                         printf(", torpedo number %d", n);
 145                 printf(":\n%6.1f\t%4.1f\n", x, y);
 146                 while (1)
 147                 {
 148                         ix = x += dx;
 149                         iy = y += dy;
 150                         if (x < 0.0 || x >= sectsize || y < 0.0 || y >= sectsize)
 151                         {
 152                                 printf("Torpedo missed\n");
 153                                 break;
 154                         }
 155                         printf("%6.1f\t%4.1f\n", x, y);
 156                         switch (Sect[ix][iy])
 157                         {
 158                           case EMPTY:
 159                                 continue;
 160
 161                           case HOLE:
 162                                 printf("Torpedo disappears into a black hole\n");
 163                                 break;
 164
 165                           case KLINGON:
 166                                 for (k = 0; k < Etc.nkling; k++)
 167                                 {
 168                                         if (Etc.klingon[k].x != ix || Etc.klingon[k].y != iy)
 169                                                 continue;
 170                                         Etc.klingon[k].power -= 500 + ranf(501);
 171                                         if (Etc.klingon[k].power > 0)
 172                                         {
 173                                                 printf("*** Hit on Klingon at %d,%d: extensive damages\n",
 174                                                         ix, iy);
 175                                                 break;
 176                                         }
 177                                         killk(ix, iy);
 178                                         break;
 179                                 }
 180                                 break;
 181
 182                           case STAR:
 183                                 nova(ix, iy);
 184                                 break;
 185
 186                           case INHABIT:
 187                                 kills(ix, iy, -1);
 188                                 break;
 189
 190                           case BASE:
 191                                 killb(Ship.quadx, Ship.quady);
 192                                 Game.killb += 1;
 193                                 break;
 194                           default:
 195                                 printf("Unknown object %c at %d,%d destroyed\n",
 196                                         Sect[ix][iy], ix, iy);
 197                                 Sect[ix][iy] = EMPTY;
 198                                 break;
 199                         }
 200                         break;
 201                 }
 202                 if (damaged(TORPED) || Quad[Ship.quadx][Ship.quady].stars < 0)
 203                         break;
 204                 course += burst;
 205         }
 206         Move.free = 0;
 207 }
 208
 209
 210 /*
 211 **  RANDOMIZE COURSE
 212 **
 213 **      This routine randomizes the course for torpedo number 'n'.
 214 **      Other things handled by this routine are misfires, damages
 215 **      to the tubes, etc.
 216 */
 217
 218 randcourse(n)
 219 int     n;
 220 {
 221         double                  r;
 222         register int            d;
 223
 224         d = ((franf() + franf()) - 1.0) * 20;
 225         if (abs(d) > 12)
 226         {
 227                 printf("Photon tubes misfire");
 228                 if (n < 0)
 229                         printf("\n");
 230                 else
 231                         printf(" on torpedo %d\n", n);
 232                 if (ranf(2))
 233                 {
 234                         damage(TORPED, 0.2 * abs(d) * (franf() + 1.0));
 235                 }
 236                 d *= 1.0 + 2.0 * franf();
 237         }
 238         if (Ship.shldup || Ship.cond == DOCKED)
 239         {
 240                 r = Ship.shield;
 241                 r = 1.0 + r / Param.shield;
 242                 if (Ship.cond == DOCKED)
 243                         r = 2.0;
 244                 d *= r;
 245         }
 246         return (d);
 247 }