trek/torped.c

   1 /*      $NetBSD: torped.c,v 1.4 1997/10/12 21:25:22 christos 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 #include <sys/cdefs.h>
  37 #ifndef lint
  38 #if 0
  39 static char sccsid[] = "@(#)torped.c    8.1 (Berkeley) 5/31/93";
  40 #else
  41 __RCSID("$NetBSD: torped.c,v 1.4 1997/10/12 21:25:22 christos Exp $");
  42 #endif
  43 #endif /* not lint */
  44
  45 #include <stdio.h>
  46 #include <math.h>
  47 #include "trek.h"
  48 #include "getpar.h"
  49
  50 /*
  51 **  PHOTON TORPEDO CONTROL
  52 **
  53 **      Either one or three photon torpedoes are fired.  If three
  54 **      are fired, it is called a "burst" and you also specify
  55 **      a spread angle.
  56 **
  57 **      Torpedoes are never 100% accurate.  There is always a random
  58 **      cludge factor in their course which is increased if you have
  59 **      your shields up.  Hence, you will find that they are more
  60 **      accurate at close range.  However, they have the advantage that
  61 **      at long range they don't lose any of their power as phasers
  62 **      do, i.e., a hit is a hit is a hit, by any other name.
  63 **
  64 **      When the course spreads too much, you get a misfire, and the
  65 **      course is randomized even more.  You also have the chance that
  66 **      the misfire damages your torpedo tubes.
  67 */
  68
  69 static int randcourse __P((int));
  70
  71 /*ARGSUSED*/
  72 void
  73 torped(v)
  74         int v;
  75 {
  76         int             ix, iy;
  77         double          x, y, dx, dy;
  78         double          angle;
  79         int             course, course2;
  80         int             k;
  81         double          bigger;
  82         double          sectsize;
  83         int             burst;
  84         int             n;
  85
  86         if (Ship.cloaked)
  87         {
  88                 printf("Federation regulations do not permit attack while cloaked.\n");
  89                 return;
  90         }
  91         if (check_out(TORPED))
  92                 return;
  93         if (Ship.torped <= 0)
  94         {
  95                 printf("All photon torpedos expended\n");
  96                 return;
  97         }
  98
  99         /* get the course */
 100         course = getintpar("Torpedo course");
 101         if (course < 0 || course > 360)
 102                 return;
 103         burst = -1;
 104
 105         /* need at least three torpedoes for a burst */
 106         if (Ship.torped < 3)
 107         {
 108                 printf("No-burst mode selected\n");
 109                 burst = 0;
 110         }
 111         else
 112         {
 113                 /* see if the user wants one */
 114                 if (!testnl())
 115                 {
 116                         k = ungetc(cgetc(0), stdin);
 117                         if (k >= '0' && k <= '9')
 118                                 burst = 1;
 119                 }
 120         }
 121         if (burst < 0)
 122         {
 123                 burst = getynpar("Do you want a burst");
 124         }
 125         if (burst)
 126         {
 127                 burst = getintpar("burst angle");
 128                 if (burst <= 0)
 129                         return;
 130                 if (burst > 15) {
 131                         printf("Maximum burst angle is 15 degrees\n");
 132                         return;
 133                 }
 134         }
 135         sectsize = NSECTS;
 136         n = -1;
 137         if (burst)
 138         {
 139                 n = 1;
 140                 course -= burst;
 141         }
 142         for (; n && n <= 3; n++)
 143         {
 144                 /* select a nice random course */
 145                 course2 = course + randcourse(n);
 146                 angle = course2 * 0.0174532925;                 /* convert to radians */
 147                 dx = -cos(angle);
 148                 dy =  sin(angle);
 149                 bigger = fabs(dx);
 150                 x = fabs(dy);
 151                 if (x > bigger)
 152                         bigger = x;
 153                 dx /= bigger;
 154                 dy /= bigger;
 155                 x = Ship.sectx + 0.5;
 156                 y = Ship.secty + 0.5;
 157                 if (Ship.cond != DOCKED)
 158                         Ship.torped -= 1;
 159                 printf("Torpedo track");
 160                 if (n > 0)
 161                         printf(", torpedo number %d", n);
 162                 printf(":\n%6.1f\t%4.1f\n", x, y);
 163                 while (1)
 164                 {
 165                         ix = x += dx;
 166                         iy = y += dy;
 167                         if (x < 0.0 || x >= sectsize || y < 0.0 || y >= sectsize)
 168                         {
 169                                 printf("Torpedo missed\n");
 170                                 break;
 171                         }
 172                         printf("%6.1f\t%4.1f\n", x, y);
 173                         switch (Sect[ix][iy])
 174                         {
 175                           case EMPTY:
 176                                 continue;
 177
 178                           case HOLE:
 179                                 printf("Torpedo disappears into a black hole\n");
 180                                 break;
 181
 182                           case KLINGON:
 183                                 for (k = 0; k < Etc.nkling; k++)
 184                                 {
 185                                         if (Etc.klingon[k].x != ix || Etc.klingon[k].y != iy)
 186                                                 continue;
 187                                         Etc.klingon[k].power -= 500 + ranf(501);
 188                                         if (Etc.klingon[k].power > 0)
 189                                         {
 190                                                 printf("*** Hit on Klingon at %d,%d: extensive damages\n",
 191                                                         ix, iy);
 192                                                 break;
 193                                         }
 194                                         killk(ix, iy);
 195                                         break;
 196                                 }
 197                                 break;
 198
 199                           case STAR:
 200                                 nova(ix, iy);
 201                                 break;
 202
 203                           case INHABIT:
 204                                 kills(ix, iy, -1);
 205                                 break;
 206
 207                           case BASE:
 208                                 killb(Ship.quadx, Ship.quady);
 209                                 Game.killb += 1;
 210                                 break;
 211                           default:
 212                                 printf("Unknown object %c at %d,%d destroyed\n",
 213                                         Sect[ix][iy], ix, iy);
 214                                 Sect[ix][iy] = EMPTY;
 215                                 break;
 216                         }
 217                         break;
 218                 }
 219                 if (damaged(TORPED) || Quad[Ship.quadx][Ship.quady].stars < 0)
 220                         break;
 221                 course += burst;
 222         }
 223         Move.free = 0;
 224 }
 225
 226
 227 /*
 228 **  RANDOMIZE COURSE
 229 **
 230 **      This routine randomizes the course for torpedo number 'n'.
 231 **      Other things handled by this routine are misfires, damages
 232 **      to the tubes, etc.
 233 */
 234
 235 static int
 236 randcourse(n)
 237 int     n;
 238 {
 239         double                  r;
 240         int             d;
 241
 242         d = ((franf() + franf()) - 1.0) * 20;
 243         if (abs(d) > 12)
 244         {
 245                 printf("Photon tubes misfire");
 246                 if (n < 0)
 247                         printf("\n");
 248                 else
 249                         printf(" on torpedo %d\n", n);
 250                 if (ranf(2))
 251                 {
 252                         damage(TORPED, 0.2 * abs(d) * (franf() + 1.0));
 253                 }
 254                 d *= 1.0 + 2.0 * franf();
 255         }
 256         if (Ship.shldup || Ship.cond == DOCKED)
 257         {
 258                 r = Ship.shield;
 259                 r = 1.0 + r / Param.shield;
 260                 if (Ship.cond == DOCKED)
 261                         r = 2.0;
 262                 d *= r;
 263         }
 264         return (d);
 265 }