trek/computer.c

   1 /*      $NetBSD: computer.c,v 1.11 2007/12/15 19:44:44 perry 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 #if 0
  35 static char sccsid[] = "@(#)computer.c  8.1 (Berkeley) 5/31/93";
  36 #else
  37 __RCSID("$NetBSD: computer.c,v 1.11 2007/12/15 19:44:44 perry Exp $");
  38 #endif
  39 #endif /* not lint */
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <math.h>
  44 #include "trek.h"
  45 #include "getpar.h"
  46
  47 /*
  48 **  On-Board Computer
  49 **
  50 **      A computer request is fetched from the captain.  The requests
  51 **      are:
  52 **
  53 **      chart -- print a star chart of the known galaxy.  This includes
  54 **              every quadrant that has ever had a long range or
  55 **              a short range scan done of it, plus the location of
  56 **              all starbases.  This is of course updated by any sub-
  57 **              space radio broadcasts (unless the radio is out).
  58 **              The format is the same as that of a long range scan
  59 **              except that ".1." indicates that a starbase exists
  60 **              but we know nothing else.
  61 **
  62 **      trajectory -- gives the course and distance to every know
  63 **              Klingon in the quadrant.  Obviously this fails if the
  64 **              short range scanners are out.
  65 **
  66 **      course -- gives a course computation from whereever you are
  67 **              to any specified location.  If the course begins
  68 **              with a slash, the current quadrant is taken.
  69 **              Otherwise the input is quadrant and sector coordi-
  70 **              nates of the target sector.
  71 **
  72 **      move -- identical to course, except that the move is performed.
  73 **
  74 **      score -- prints out the current score.
  75 **
  76 **      pheff -- "PHaser EFFectiveness" at a given distance.  Tells
  77 **              you how much stuff you need to make it work.
  78 **
  79 **      warpcost -- Gives you the cost in time and units to move for
  80 **              a given distance under a given warp speed.
  81 **
  82 **      impcost -- Same for the impulse engines.
  83 **
  84 **      distresslist -- Gives a list of the currently known starsystems
  85 **              or starbases which are distressed, together with their
  86 **              quadrant coordinates.
  87 **
  88 **      If a command is terminated with a semicolon, you remain in
  89 **      the computer; otherwise, you escape immediately to the main
  90 **      command processor.
  91 */
  92
  93 struct cvntab   Cputab[] =
  94 {
  95         { "ch",         "art",                  (cmdfun)1,              0 },
  96         { "t",          "rajectory",            (cmdfun)2,              0 },
  97         { "c",          "ourse",                (cmdfun)3,              0 },
  98         { "m",          "ove",                  (cmdfun)3,              1 },
  99         { "s",          "core",                 (cmdfun)4,              0 },
 100         { "p",          "heff",                 (cmdfun)5,              0 },
 101         { "w",          "arpcost",              (cmdfun)6,              0 },
 102         { "i",          "mpcost",               (cmdfun)7,              0 },
 103         { "d",          "istresslist",          (cmdfun)8,              0 },
 104         { NULL,         NULL,                   NULL,                   0 }
 105 };
 106
 107 static int kalc(int, int, int, int, double *);
 108 static void prkalc(int, double);
 109
 110 /*ARGSUSED*/
 111 void
 112 computer(v)
 113         int v __unused;
 114 {
 115         int             ix, iy;
 116         int             i, j;
 117         int             tqx, tqy;
 118         const struct cvntab     *r;
 119         int             cost;
 120         int             course;
 121         double          dist, time;
 122         double          warpfact;
 123         struct quad     *q;
 124         struct event    *e;
 125
 126         if (check_out(COMPUTER))
 127                 return;
 128         while (1)
 129         {
 130                 r = getcodpar("\nRequest", Cputab);
 131                 switch ((long)r->value)
 132                 {
 133
 134                   case 1:                       /* star chart */
 135                         printf("Computer record of galaxy for all long range sensor scans\n\n");
 136                         printf("  ");
 137                         /* print top header */
 138                         for (i = 0; i < NQUADS; i++)
 139                                 printf("-%d- ", i);
 140                         printf("\n");
 141                         for (i = 0; i < NQUADS; i++)
 142                         {
 143                                 printf("%d ", i);
 144                                 for (j = 0; j < NQUADS; j++)
 145                                 {
 146                                         if (i == Ship.quadx && j == Ship.quady)
 147                                         {
 148                                                 printf("$$$ ");
 149                                                 continue;
 150                                         }
 151                                         q = &Quad[i][j];
 152                                         /* 1000 or 1001 is special case */
 153                                         if (q->scanned >= 1000)
 154                                                 if (q->scanned > 1000)
 155                                                         printf(".1. ");
 156                                                 else
 157                                                         printf("/// ");
 158                                         else
 159                                                 if (q->scanned < 0)
 160                                                         printf("... ");
 161                                                 else
 162                                                         printf("%3d ", q->scanned);
 163                                 }
 164                                 printf("%d\n", i);
 165                         }
 166                         printf("  ");
 167                         /* print bottom footer */
 168                         for (i = 0; i < NQUADS; i++)
 169                                 printf("-%d- ", i);
 170                         printf("\n");
 171                         break;
 172
 173                   case 2:                       /* trajectory */
 174                         if (check_out(SRSCAN))
 175                         {
 176                                 break;
 177                         }
 178                         if (Etc.nkling <= 0)
 179                         {
 180                                 printf("No Klingons in this quadrant\n");
 181                                 break;
 182                         }
 183                         /* for each Klingon, give the course & distance */
 184                         for (i = 0; i < Etc.nkling; i++)
 185                         {
 186                                 printf("Klingon at %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
 187                                 course = kalc(Ship.quadx, Ship.quady, Etc.klingon[i].x, Etc.klingon[i].y, &dist);
 188                                 prkalc(course, dist);
 189                         }
 190                         break;
 191
 192                   case 3:                       /* course calculation */
 193                         if (readdelim('/'))
 194                         {
 195                                 tqx = Ship.quadx;
 196                                 tqy = Ship.quady;
 197                         }
 198                         else
 199                         {
 200                                 ix = getintpar("Quadrant");
 201                                 if (ix < 0 || ix >= NSECTS)
 202                                         break;
 203                                 iy = getintpar("q-y");
 204                                 if (iy < 0 || iy >= NSECTS)
 205                                         break;
 206                                 tqx = ix;
 207                                 tqy = iy;
 208                         }
 209                         ix = getintpar("Sector");
 210                         if (ix < 0 || ix >= NSECTS)
 211                                 break;
 212                         iy = getintpar("s-y");
 213                         if (iy < 0 || iy >= NSECTS)
 214                                 break;
 215                         course = kalc(tqx, tqy, ix, iy, &dist);
 216                         if (r->value2)
 217                         {
 218                                 warp(-1, course, dist);
 219                                 break;
 220                         }
 221                         printf("%d,%d/%d,%d to %d,%d/%d,%d",
 222                                 Ship.quadx, Ship.quady, Ship.sectx, Ship.secty, tqx, tqy, ix, iy);
 223                         prkalc(course, dist);
 224                         break;
 225
 226                   case 4:                       /* score */
 227                         score();
 228                         break;
 229
 230                   case 5:                       /* phaser effectiveness */
 231                         dist = getfltpar("range");
 232                         if (dist < 0.0)
 233                                 break;
 234                         dist *= 10.0;
 235                         cost = pow(0.90, dist) * 98.0 + 0.5;
 236                         printf("Phasers are %d%% effective at that range\n", cost);
 237                         break;
 238
 239                   case 6:                       /* warp cost (time/energy) */
 240                         dist = getfltpar("distance");
 241                         if (dist < 0.0)
 242                                 break;
 243                         warpfact = getfltpar("warp factor");
 244                         if (warpfact <= 0.0)
 245                                 warpfact = Ship.warp;
 246                         cost = (dist + 0.05) * warpfact * warpfact * warpfact;
 247                         time = Param.warptime * dist / (warpfact * warpfact);
 248                         printf("Warp %.2f distance %.2f cost %.2f stardates %d (%d w/ shlds up) units\n",
 249                                 warpfact, dist, time, cost, cost + cost);
 250                         break;
 251
 252                   case 7:                       /* impulse cost */
 253                         dist = getfltpar("distance");
 254                         if (dist < 0.0)
 255                                 break;
 256                         cost = 20 + 100 * dist;
 257                         time = dist / 0.095;
 258                         printf("Distance %.2f cost %.2f stardates %d units\n",
 259                                 dist, time, cost);
 260                         break;
 261
 262                   case 8:                       /* distresslist */
 263                         j = 1;
 264                         printf("\n");
 265                         /* scan the event list */
 266                         for (i = 0; i < MAXEVENTS; i++)
 267                         {
 268                                 e = &Event[i];
 269                                 /* ignore hidden entries */
 270                                 if (e->evcode & E_HIDDEN)
 271                                         continue;
 272                                 switch (e->evcode & E_EVENT)
 273                                 {
 274
 275                                   case E_KDESB:
 276                                         printf("Klingon is attacking starbase in quadrant %d,%d\n",
 277                                                 e->x, e->y);
 278                                         j = 0;
 279                                         break;
 280
 281                                   case E_ENSLV:
 282                                   case E_REPRO:
 283                                         printf("Starsystem %s in quadrant %d,%d is distressed\n",
 284                                                 Systemname[e->systemname], e->x, e->y);
 285                                         j = 0;
 286                                         break;
 287                                 }
 288                         }
 289                         if (j)
 290                                 printf("No known distress calls are active\n");
 291                         break;
 292
 293                 }
 294
 295                 /* skip to next semicolon or newline.  Semicolon
 296                  * means get new computer request; newline means
 297                  * exit computer mode. */
 298                 while ((i = cgetc(0)) != ';')
 299                 {
 300                         if (i == '\0')
 301                                 exit(1);
 302                         if (i == '\n')
 303                         {
 304                                 ungetc(i, stdin);
 305                                 return;
 306                         }
 307                 }
 308         }
 309 }
 310
 311
 312 /*
 313 **  Course Calculation
 314 **
 315 **      Computes and outputs the course and distance from position
 316 **      sqx,sqy/ssx,ssy to tqx,tqy/tsx,tsy.
 317 */
 318
 319 static int
 320 kalc(tqx, tqy, tsx, tsy, dist)
 321 int     tqx;
 322 int     tqy;
 323 int     tsx;
 324 int     tsy;
 325 double  *dist;
 326 {
 327         double                  dx, dy;
 328         double                  quadsize;
 329         double                  angle;
 330         int             course;
 331
 332         /* normalize to quadrant distances */
 333         quadsize = NSECTS;
 334         dx = (Ship.quadx + Ship.sectx / quadsize) - (tqx + tsx / quadsize);
 335         dy = (tqy + tsy / quadsize) - (Ship.quady + Ship.secty / quadsize);
 336
 337         /* get the angle */
 338         angle = atan2(dy, dx);
 339         /* make it 0 -> 2 pi */
 340         if (angle < 0.0)
 341                 angle += 6.283185307;
 342         /* convert from radians to degrees */
 343         course = angle * 57.29577951 + 0.5;
 344         dx = dx * dx + dy * dy;
 345         *dist = sqrt(dx);
 346         return (course);
 347 }
 348
 349 static void
 350 prkalc(course, dist)
 351 int     course;
 352 double  dist;
 353 {
 354         printf(": course %d  dist %.3f\n", course, dist);
 355 }