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[] = "from: @(#)torped.c    5.4 (Berkeley) 6/1/90";*/
  36 static char rcsid[] = "$Id: torped.c,v 1.2 1993/08/01 18:49:55 mycroft Exp $";
  37 #endif /* not lint */
  38
  39 # include       <stdio.h>
  40 # include       "trek.h"
  41
  42 /*
  43 **  PHOTON TORPEDO CONTROL
  44 **
  45 **      Either one or three photon torpedoes are fired.  If three
  46 **      are fired, it is called a "burst" and you also specify
  47 **      a spread angle.
  48 **
  49 **      Torpedoes are never 100% accurate.  There is always a random
  50 **      cludge factor in their course which is increased if you have
  51 **      your shields up.  Hence, you will find that they are more
  52 **      accurate at close range.  However, they have the advantage that
  53 **      at long range they don't lose any of their power as phasers
  54 **      do, i.e., a hit is a hit is a hit, by any other name.
  55 **
  56 **      When the course spreads too much, you get a misfire, and the
  57 **      course is randomized even more.  You also have the chance that
  58 **      the misfire damages your torpedo tubes.
  59 */
  60
  61
  62 torped()
  63 {
  64         register int            ix, iy;
  65         double                  x, y, dx, dy;
  66         double                  angle;
  67         int                     course, course2;
  68         register int            k;
  69         double                  bigger;
  70         double                  sectsize;
  71         int                     burst;
  72         int                     n;
  73
  74         if (Ship.cloaked)
  75         {
  76                 return (printf("Federation regulations do not permit attack while cloaked.\n"));
  77         }
  78         if (check_out(TORPED))
  79                 return;
  80         if (Ship.torped <= 0)
  81         {
  82                 return (printf("All photon torpedos expended\n"));
  83         }
  84
  85         /* get the course */
  86         course = getintpar("Torpedo course");
  87         if (course < 0 || course > 360)
  88                 return;
  89         burst = -1;
  90
  91         /* need at least three torpedoes for a burst */
  92         if (Ship.torped < 3)
  93         {
  94                 printf("No-burst mode selected\n");
  95                 burst = 0;
  96         }
  97         else
  98         {
  99                 /* see if the user wants one */
 100                 if (!testnl())
 101                 {
 102                         k = ungetc(cgetc(0), stdin);
 103                         if (k >= '0' && k <= '9')
 104                                 burst = 1;
 105                 }
 106         }
 107         if (burst < 0)
 108         {
 109                 burst = getynpar("Do you want a burst");
 110         }
 111         if (burst)
 112         {
 113                 burst = getintpar("burst angle");
 114                 if (burst <= 0)
 115                         return;
 116                 if (burst > 15)
 117                         return (printf("Maximum burst angle is 15 degrees\n"));
 118         }
 119         sectsize = NSECTS;
 120         n = -1;
 121         if (burst)
 122         {
 123                 n = 1;
 124                 course -= burst;
 125         }
 126         for (; n && n <= 3; n++)
 127         {
 128                 /* select a nice random course */
 129                 course2 = course + randcourse(n);
 130                 angle = course2 * 0.0174532925;                 /* convert to radians */
 131                 dx = -cos(angle);
 132                 dy =  sin(angle);
 133                 bigger = fabs(dx);
 134                 x = fabs(dy);
 135                 if (x > bigger)
 136                         bigger = x;
 137                 dx /= bigger;
 138                 dy /= bigger;
 139                 x = Ship.sectx + 0.5;
 140                 y = Ship.secty + 0.5;
 141                 if (Ship.cond != DOCKED)
 142                         Ship.torped -= 1;
 143                 printf("Torpedo track");
 144                 if (n > 0)
 145                         printf(", torpedo number %d", n);
 146                 printf(":\n%6.1f\t%4.1f\n", x, y);
 147                 while (1)
 148                 {
 149                         ix = x += dx;
 150                         iy = y += dy;
 151                         if (x < 0.0 || x >= sectsize || y < 0.0 || y >= sectsize)
 152                         {
 153                                 printf("Torpedo missed\n");
 154                                 break;
 155                         }
 156                         printf("%6.1f\t%4.1f\n", x, y);
 157                         switch (Sect[ix][iy])
 158                         {
 159                           case EMPTY:
 160                                 continue;
 161
 162                           case HOLE:
 163                                 printf("Torpedo disappears into a black hole\n");
 164                                 break;
 165
 166                           case KLINGON:
 167                                 for (k = 0; k < Etc.nkling; k++)
 168                                 {
 169                                         if (Etc.klingon[k].x != ix || Etc.klingon[k].y != iy)
 170                                                 continue;
 171                                         Etc.klingon[k].power -= 500 + ranf(501);
 172                                         if (Etc.klingon[k].power > 0)
 173                                         {
 174                                                 printf("*** Hit on Klingon at %d,%d: extensive damages\n",
 175                                                         ix, iy);
 176                                                 break;
 177                                         }
 178                                         killk(ix, iy);
 179                                         break;
 180                                 }
 181                                 break;
 182
 183                           case STAR:
 184                                 nova(ix, iy);
 185                                 break;
 186
 187                           case INHABIT:
 188                                 kills(ix, iy, -1);
 189                                 break;
 190
 191                           case BASE:
 192                                 killb(Ship.quadx, Ship.quady);
 193                                 Game.killb += 1;
 194                                 break;
 195                           default:
 196                                 printf("Unknown object %c at %d,%d destroyed\n",
 197                                         Sect[ix][iy], ix, iy);
 198                                 Sect[ix][iy] = EMPTY;
 199                                 break;
 200                         }
 201                         break;
 202                 }
 203                 if (damaged(TORPED) || Quad[Ship.quadx][Ship.quady].stars < 0)
 204                         break;
 205                 course += burst;
 206         }
 207         Move.free = 0;
 208 }
 209
 210
 211 /*
 212 **  RANDOMIZE COURSE
 213 **
 214 **      This routine randomizes the course for torpedo number 'n'.
 215 **      Other things handled by this routine are misfires, damages
 216 **      to the tubes, etc.
 217 */
 218
 219 randcourse(n)
 220 int     n;
 221 {
 222         double                  r;
 223         register int            d;
 224
 225         d = ((franf() + franf()) - 1.0) * 20;
 226         if (abs(d) > 12)
 227         {
 228                 printf("Photon tubes misfire");
 229                 if (n < 0)
 230                         printf("\n");
 231                 else
 232                         printf(" on torpedo %d\n", n);
 233                 if (ranf(2))
 234                 {
 235                         damage(TORPED, 0.2 * abs(d) * (franf() + 1.0));
 236                 }
 237                 d *= 1.0 + 2.0 * franf();
 238         }
 239         if (Ship.shldup || Ship.cond == DOCKED)
 240         {
 241                 r = Ship.shield;
 242                 r = 1.0 + r / Param.shield;
 243                 if (Ship.cond == DOCKED)
 244                         r = 2.0;
 245                 d *= r;
 246         }
 247         return (d);
 248 }