games/trek/torped.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  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  * @(#)torped.c 8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/torped.c,v 1.5 1999/11/30 03:49:55 billf Exp $
  35  * $DragonFly: src/games/trek/torped.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  36  */
  37
  38 # include       "getpar.h"
  39 # include       "trek.h"
  40
  41 static int      randcourse(int);
  42
  43 /*
  44 **  PHOTON TORPEDO CONTROL
  45 **
  46 **      Either one or three photon torpedoes are fired.  If three
  47 **      are fired, it is called a "burst" and you also specify
  48 **      a spread angle.
  49 **
  50 **      Torpedoes are never 100% accurate.  There is always a random
  51 **      cludge factor in their course which is increased if you have
  52 **      your shields up.  Hence, you will find that they are more
  53 **      accurate at close range.  However, they have the advantage that
  54 **      at long range they don't lose any of their power as phasers
  55 **      do, i.e., a hit is a hit is a hit, by any other name.
  56 **
  57 **      When the course spreads too much, you get a misfire, and the
  58 **      course is randomized even more.  You also have the chance that
  59 **      the misfire damages your torpedo tubes.
  60 */
  61
  62 void
  63 torped(__unused int unused)
  64 {
  65         int             ix, iy;
  66         double                  x, y, dx, dy;
  67         double                  angle;
  68         int                     course, course2;
  69         int             k;
  70         double                  bigger;
  71         double                  sectsize;
  72         int                     burst;
  73         int                     n;
  74
  75         if (Ship.cloaked)
  76         {
  77                 printf("Federation regulations do not permit attack while cloaked.\n");
  78                 return;
  79         }
  80         if (check_out(TORPED))
  81                 return;
  82         if (Ship.torped <= 0)
  83         {
  84                 printf("All photon torpedos expended\n");
  85                 return;
  86         }
  87
  88         /* get the course */
  89         course = getintpar("Torpedo course");
  90         if (course < 0 || course > 360)
  91                 return;
  92         burst = -1;
  93
  94         /* need at least three torpedoes for a burst */
  95         if (Ship.torped < 3)
  96         {
  97                 printf("No-burst mode selected\n");
  98                 burst = 0;
  99         }
 100         else
 101         {
 102                 /* see if the user wants one */
 103                 if (!testnl())
 104                 {
 105                         k = ungetc(cgetc(0), stdin);
 106                         if (k >= '0' && k <= '9')
 107                                 burst = 1;
 108                 }
 109         }
 110         if (burst < 0)
 111         {
 112                 burst = getynpar("Do you want a burst");
 113         }
 114         if (burst)
 115         {
 116                 burst = getintpar("burst angle");
 117                 if (burst <= 0)
 118                         return;
 119                 if (burst > 15) {
 120                         printf("Maximum burst angle is 15 degrees\n");
 121                         return;
 122                 }
 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 static int
 225 randcourse(int n)
 226 {
 227         double                  r;
 228         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 }