games/trek/computer.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  * @(#)computer.c       8.1 (Berkeley) 5/31/93
  34  * $FreeBSD: src/games/trek/computer.c,v 1.5 1999/11/30 03:49:45 billf Exp $
  35  * $DragonFly: src/games/trek/computer.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  36  */
  37
  38 # include       "trek.h"
  39 # include       "getpar.h"
  40
  41 static int      kalc(int, int, int, int, double *);
  42 static void     prkalc(int, double);
  43
  44 /*
  45 **  On-Board Computer
  46 **
  47 **      A computer request is fetched from the captain.  The requests
  48 **      are:
  49 **
  50 **      chart -- print a star chart of the known galaxy.  This includes
  51 **              every quadrant that has ever had a long range or
  52 **              a short range scan done of it, plus the location of
  53 **              all starbases.  This is of course updated by any sub-
  54 **              space radio broadcasts (unless the radio is out).
  55 **              The format is the same as that of a long range scan
  56 **              except that ".1." indicates that a starbase exists
  57 **              but we know nothing else.
  58 **
  59 **      trajectory -- gives the course and distance to every know
  60 **              Klingon in the quadrant.  Obviously this fails if the
  61 **              short range scanners are out.
  62 **
  63 **      course -- gives a course computation from whereever you are
  64 **              to any specified location.  If the course begins
  65 **              with a slash, the current quadrant is taken.
  66 **              Otherwise the input is quadrant and sector coordi-
  67 **              nates of the target sector.
  68 **
  69 **      move -- identical to course, except that the move is performed.
  70 **
  71 **      score -- prints out the current score.
  72 **
  73 **      pheff -- "PHaser EFFectiveness" at a given distance.  Tells
  74 **              you how much stuff you need to make it work.
  75 **
  76 **      warpcost -- Gives you the cost in time and units to move for
  77 **              a given distance under a given warp speed.
  78 **
  79 **      impcost -- Same for the impulse engines.
  80 **
  81 **      distresslist -- Gives a list of the currently known starsystems
  82 **              or starbases which are distressed, together with their
  83 **              quadrant coordinates.
  84 **
  85 **      If a command is terminated with a semicolon, you remain in
  86 **      the computer; otherwise, you escape immediately to the main
  87 **      command processor.
  88 */
  89
  90 struct cvntab   Cputab[] =
  91 {
  92         { "ch", "art",                  (void (*)(int))1,       0 },
  93         { "t",  "rajectory",            (void (*)(int))2,       0 },
  94         { "c",  "ourse",                (void (*)(int))3,       0 },
  95         { "m",  "ove",                  (void (*)(int))3,       1 },
  96         { "s",  "core",                 (void (*)(int))4,       0 },
  97         { "p",  "heff",                 (void (*)(int))5,       0 },
  98         { "w",  "arpcost",              (void (*)(int))6,       0 },
  99         { "i",  "mpcost",               (void (*)(int))7,       0 },
 100         { "d",  "istresslist",          (void (*)(int))8,       0 },
 101         { NULL, NULL,                   NULL,                   0 }
 102 };
 103
 104 void
 105 computer(__unused int unused)
 106 {
 107         int                     ix, iy;
 108         int             i, j;
 109         int                     tqx, tqy;
 110         struct cvntab           *r;
 111         int                     cost;
 112         int                     course;
 113         double                  dist, p_time;
 114         double                  warpfact;
 115         struct quad             *q;
 116         struct event    *e;
 117
 118         if (check_out(COMPUTER))
 119                 return;
 120         while (1)
 121         {
 122                 r = getcodpar("\nRequest", Cputab);
 123                 switch ((long)r->value)
 124                 {
 125
 126                   case 1:                       /* star chart */
 127                         printf("Computer record of galaxy for all long range sensor scans\n\n");
 128                         printf("  ");
 129                         /* print top header */
 130                         for (i = 0; i < NQUADS; i++)
 131                                 printf("-%d- ", i);
 132                         printf("\n");
 133                         for (i = 0; i < NQUADS; i++)
 134                         {
 135                                 printf("%d ", i);
 136                                 for (j = 0; j < NQUADS; j++)
 137                                 {
 138                                         if (i == Ship.quadx && j == Ship.quady)
 139                                         {
 140                                                 printf("$$$ ");
 141                                                 continue;
 142                                         }
 143                                         q = &Quad[i][j];
 144                                         /* 1000 or 1001 is special case */
 145                                         if (q->scanned >= 1000)
 146                                                 if (q->scanned > 1000)
 147                                                         printf(".1. ");
 148                                                 else
 149                                                         printf("/// ");
 150                                         else
 151                                                 if (q->scanned < 0)
 152                                                         printf("... ");
 153                                                 else
 154                                                         printf("%3d ", q->scanned);
 155                                 }
 156                                 printf("%d\n", i);
 157                         }
 158                         printf("  ");
 159                         /* print bottom footer */
 160                         for (i = 0; i < NQUADS; i++)
 161                                 printf("-%d- ", i);
 162                         printf("\n");
 163                         break;
 164
 165                   case 2:                       /* trajectory */
 166                         if (check_out(SRSCAN))
 167                         {
 168                                 break;
 169                         }
 170                         if (Etc.nkling <= 0)
 171                         {
 172                                 printf("No Klingons in this quadrant\n");
 173                                 break;
 174                         }
 175                         /* for each Klingon, give the course & distance */
 176                         for (i = 0; i < Etc.nkling; i++)
 177                         {
 178                                 printf("Klingon at %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
 179                                 course = kalc(Ship.quadx, Ship.quady, Etc.klingon[i].x, Etc.klingon[i].y, &dist);
 180                                 prkalc(course, dist);
 181                         }
 182                         break;
 183
 184                   case 3:                       /* course calculation */
 185                         if (readdelim('/'))
 186                         {
 187                                 tqx = Ship.quadx;
 188                                 tqy = Ship.quady;
 189                         }
 190                         else
 191                         {
 192                                 ix = getintpar("Quadrant");
 193                                 if (ix < 0 || ix >= NSECTS)
 194                                         break;
 195                                 iy = getintpar("q-y");
 196                                 if (iy < 0 || iy >= NSECTS)
 197                                         break;
 198                                 tqx = ix;
 199                                 tqy = iy;
 200                         }
 201                         ix = getintpar("Sector");
 202                         if (ix < 0 || ix >= NSECTS)
 203                                 break;
 204                         iy = getintpar("s-y");
 205                         if (iy < 0 || iy >= NSECTS)
 206                                 break;
 207                         course = kalc(tqx, tqy, ix, iy, &dist);
 208                         if (r->value2)
 209                         {
 210                                 warp(-1, course, dist);
 211                                 break;
 212                         }
 213                         printf("%d,%d/%d,%d to %d,%d/%d,%d",
 214                                 Ship.quadx, Ship.quady, Ship.sectx, Ship.secty, tqx, tqy, ix, iy);
 215                         prkalc(course, dist);
 216                         break;
 217
 218                   case 4:                       /* score */
 219                         score();
 220                         break;
 221
 222                   case 5:                       /* phaser effectiveness */
 223                         dist = getfltpar("range");
 224                         if (dist < 0.0)
 225                                 break;
 226                         dist *= 10.0;
 227                         cost = pow(0.90, dist) * 98.0 + 0.5;
 228                         printf("Phasers are %d%% effective at that range\n", cost);
 229                         break;
 230
 231                   case 6:                       /* warp cost (time/energy) */
 232                         dist = getfltpar("distance");
 233                         if (dist < 0.0)
 234                                 break;
 235                         warpfact = getfltpar("warp factor");
 236                         if (warpfact <= 0.0)
 237                                 warpfact = Ship.warp;
 238                         cost = (dist + 0.05) * warpfact * warpfact * warpfact;
 239                         p_time = Param.warptime * dist / (warpfact * warpfact);
 240                         printf("Warp %.2f distance %.2f cost %.2f stardates %d (%d w/ shlds up) units\n",
 241                                 warpfact, dist, p_time, cost, cost + cost);
 242                         break;
 243
 244                   case 7:                       /* impulse cost */
 245                         dist = getfltpar("distance");
 246                         if (dist < 0.0)
 247                                 break;
 248                         cost = 20 + 100 * dist;
 249                         p_time = dist / 0.095;
 250                         printf("Distance %.2f cost %.2f stardates %d units\n",
 251                                 dist, p_time, cost);
 252                         break;
 253
 254                   case 8:                       /* distresslist */
 255                         j = 1;
 256                         printf("\n");
 257                         /* scan the event list */
 258                         for (i = 0; i < MAXEVENTS; i++)
 259                         {
 260                                 e = &Event[i];
 261                                 /* ignore hidden entries */
 262                                 if (e->evcode & E_HIDDEN)
 263                                         continue;
 264                                 switch (e->evcode & E_EVENT)
 265                                 {
 266
 267                                   case E_KDESB:
 268                                         printf("Klingon is attacking starbase in quadrant %d,%d\n",
 269                                                 e->x, e->y);
 270                                         j = 0;
 271                                         break;
 272
 273                                   case E_ENSLV:
 274                                   case E_REPRO:
 275                                         printf("Starsystem %s in quadrant %d,%d is distressed\n",
 276                                                 Systemname[e->systemname], e->x, e->y);
 277                                         j = 0;
 278                                         break;
 279                                 }
 280                         }
 281                         if (j)
 282                                 printf("No known distress calls are active\n");
 283                         break;
 284
 285                 }
 286
 287                 /* skip to next semicolon or newline.  Semicolon
 288                  * means get new computer request; newline means
 289                  * exit computer mode. */
 290                 while ((i = cgetc(0)) != ';')
 291                 {
 292                         if (i == '\0')
 293                                 exit(1);
 294                         if (i == '\n')
 295                         {
 296                                 ungetc(i, stdin);
 297                                 return;
 298                         }
 299                 }
 300         }
 301 }
 302
 303
 304 /*
 305 **  Course Calculation
 306 **
 307 **      Computes and outputs the course and distance from position
 308 **      sqx,sqy/ssx,ssy to tqx,tqy/tsx,tsy.
 309 */
 310
 311 static int
 312 kalc(int tqx, int tqy, int tsx, int tsy, double *dist)
 313 {
 314         double                  dx, dy;
 315         double                  quadsize;
 316         double                  angle;
 317         int             course;
 318
 319         /* normalize to quadrant distances */
 320         quadsize = NSECTS;
 321         dx = (Ship.quadx + Ship.sectx / quadsize) - (tqx + tsx / quadsize);
 322         dy = (tqy + tsy / quadsize) - (Ship.quady + Ship.secty / quadsize);
 323
 324         /* get the angle */
 325         angle = atan2(dy, dx);
 326         /* make it 0 -> 2 pi */
 327         if (angle < 0.0)
 328                 angle += 6.283185307;
 329         /* convert from radians to degrees */
 330         course = angle * 57.29577951 + 0.5;
 331         dx = dx * dx + dy * dy;
 332         *dist = sqrt(dx);
 333         return (course);
 334 }
 335
 336 static void
 337 prkalc(int course, double dist)
 338 {
 339         printf(": course %d  dist %.3f\n", course, dist);
 340 }