games/trek/computer.c

   1 /*      @(#)computer.c  8.1 (Berkeley) 5/31/93                          */
   2 /*      $NetBSD: computer.c,v 1.16 2009/08/12 08:54:54 dholland Exp $   */
   3
   4 /*
   5  * Copyright (c) 1980, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include <stdio.h>
  34 #include <stdlib.h>
  35 #include <math.h>
  36 #include "trek.h"
  37 #include "getpar.h"
  38
  39 /*
  40 **  On-Board Computer
  41 **
  42 **      A computer request is fetched from the captain.  The requests
  43 **      are:
  44 **
  45 **      chart -- print a star chart of the known galaxy.  This includes
  46 **              every quadrant that has ever had a long range or
  47 **              a short range scan done of it, plus the location of
  48 **              all starbases.  This is of course updated by any sub-
  49 **              space radio broadcasts (unless the radio is out).
  50 **              The format is the same as that of a long range scan
  51 **              except that ".1." indicates that a starbase exists
  52 **              but we know nothing else.
  53 **
  54 **      trajectory -- gives the course and distance to every know
  55 **              Klingon in the quadrant.  Obviously this fails if the
  56 **              short range scanners are out.
  57 **
  58 **      course -- gives a course computation from whereever you are
  59 **              to any specified location.  If the course begins
  60 **              with a slash, the current quadrant is taken.
  61 **              Otherwise the input is quadrant and sector coordi-
  62 **              nates of the target sector.
  63 **
  64 **      move -- identical to course, except that the move is performed.
  65 **
  66 **      score -- prints out the current score.
  67 **
  68 **      pheff -- "PHaser EFFectiveness" at a given distance.  Tells
  69 **              you how much stuff you need to make it work.
  70 **
  71 **      warpcost -- Gives you the cost in time and units to move for
  72 **              a given distance under a given warp speed.
  73 **
  74 **      impcost -- Same for the impulse engines.
  75 **
  76 **      distresslist -- Gives a list of the currently known starsystems
  77 **              or starbases which are distressed, together with their
  78 **              quadrant coordinates.
  79 **
  80 **      If a command is terminated with a semicolon, you remain in
  81 **      the computer; otherwise, you escape immediately to the main
  82 **      command processor.
  83 */
  84
  85 static struct cvntab Cputab[] = {
  86         { "ch",         "art",                  (cmdfun)1,              0 },
  87         { "t",          "rajectory",            (cmdfun)2,              0 },
  88         { "c",          "ourse",                (cmdfun)3,              0 },
  89         { "m",          "ove",                  (cmdfun)3,              1 },
  90         { "s",          "core",                 (cmdfun)4,              0 },
  91         { "p",          "heff",                 (cmdfun)5,              0 },
  92         { "w",          "arpcost",              (cmdfun)6,              0 },
  93         { "i",          "mpcost",               (cmdfun)7,              0 },
  94         { "d",          "istresslist",          (cmdfun)8,              0 },
  95         { NULL,         NULL,                   NULL,                   0 }
  96 };
  97
  98 static int kalc(int, int, int, int, double *);
  99 static void prkalc(int, double);
 100
 101 /*ARGSUSED*/
 102 void
 103 computer(int v __unused)
 104 {
 105         int             ix, iy;
 106         int             i, j;
 107         int             tqx, tqy;
 108         const struct cvntab     *r;
 109         int             cost;
 110         int             course;
 111         double          dist, time;
 112         double          warpfact;
 113         struct quad     *q;
 114         struct event    *e;
 115
 116         if (check_out(COMPUTER))
 117                 return;
 118         while (1) {
 119                 r = getcodpar("\nRequest", Cputab);
 120                 switch ((long)r->value) {
 121
 122                   case 1:                       /* star chart */
 123                         printf("Computer record of galaxy for all long range "
 124                                "sensor scans\n\n");
 125                         printf("  ");
 126                         /* print top header */
 127                         for (i = 0; i < NQUADS; i++)
 128                                 printf("-%d- ", i);
 129                         printf("\n");
 130                         for (i = 0; i < NQUADS; i++) {
 131                                 printf("%d ", i);
 132                                 for (j = 0; j < NQUADS; j++) {
 133                                         if (i == Ship.quadx &&
 134                                             j == Ship.quady) {
 135                                                 printf("$$$ ");
 136                                                 continue;
 137                                         }
 138                                         q = &Quad[i][j];
 139                                         /* 1000 or 1001 is special case */
 140                                         if (q->scanned >= 1000)
 141                                                 if (q->scanned > 1000)
 142                                                         printf(".1. ");
 143                                                 else
 144                                                         printf("/// ");
 145                                         else
 146                                                 if (q->scanned < 0)
 147                                                         printf("... ");
 148                                                 else
 149                                                         printf("%3d ",
 150                                                                 q->scanned);
 151                                 }
 152                                 printf("%d\n", i);
 153                         }
 154                         printf("  ");
 155                         /* print bottom footer */
 156                         for (i = 0; i < NQUADS; i++)
 157                                 printf("-%d- ", i);
 158                         printf("\n");
 159                         break;
 160
 161                   case 2:                       /* trajectory */
 162                         if (check_out(SRSCAN)) {
 163                                 break;
 164                         }
 165                         if (Etc.nkling <= 0) {
 166                                 printf("No Klingons in this quadrant\n");
 167                                 break;
 168                         }
 169                         /* for each Klingon, give the course & distance */
 170                         for (i = 0; i < Etc.nkling; i++) {
 171                                 printf("Klingon at %d,%d",
 172                                         Etc.klingon[i].x, Etc.klingon[i].y);
 173                                 course = kalc(Ship.quadx, Ship.quady,
 174                                               Etc.klingon[i].x,
 175                                               Etc.klingon[i].y, &dist);
 176                                 prkalc(course, dist);
 177                         }
 178                         break;
 179
 180                   case 3:                       /* course calculation */
 181                         if (readdelim('/')) {
 182                                 tqx = Ship.quadx;
 183                                 tqy = Ship.quady;
 184                         } else {
 185                                 ix = getintpar("Quadrant");
 186                                 if (ix < 0 || ix >= NSECTS)
 187                                         break;
 188                                 iy = getintpar("q-y");
 189                                 if (iy < 0 || iy >= NSECTS)
 190                                         break;
 191                                 tqx = ix;
 192                                 tqy = iy;
 193                         }
 194                         ix = getintpar("Sector");
 195                         if (ix < 0 || ix >= NSECTS)
 196                                 break;
 197                         iy = getintpar("s-y");
 198                         if (iy < 0 || iy >= NSECTS)
 199                                 break;
 200                         course = kalc(tqx, tqy, ix, iy, &dist);
 201                         if (r->value2) {
 202                                 warp(-1, course, dist);
 203                                 break;
 204                         }
 205                         printf("%d,%d/%d,%d to %d,%d/%d,%d",
 206                                 Ship.quadx, Ship.quady, Ship.sectx, Ship.secty,
 207                                 tqx, tqy, ix, iy);
 208                         prkalc(course, dist);
 209                         break;
 210
 211                   case 4:                       /* score */
 212                         score();
 213                         break;
 214
 215                   case 5:                       /* phaser effectiveness */
 216                         dist = getfltpar("range");
 217                         if (dist < 0.0)
 218                                 break;
 219                         dist *= 10.0;
 220                         cost = pow(0.90, dist) * 98.0 + 0.5;
 221                         printf("Phasers are %d%% effective at that range\n",
 222                                 cost);
 223                         break;
 224
 225                   case 6:                       /* warp cost (time/energy) */
 226                         dist = getfltpar("distance");
 227                         if (dist < 0.0)
 228                                 break;
 229                         warpfact = getfltpar("warp factor");
 230                         if (warpfact <= 0.0)
 231                                 warpfact = Ship.warp;
 232                         cost = (dist + 0.05) * warpfact * warpfact * warpfact;
 233                         time = Param.warptime * dist / (warpfact * warpfact);
 234                         printf("Warp %.2f distance %.2f cost %.2f "
 235                                "stardates %d (%d w/ shlds up) units\n",
 236                                 warpfact, dist, time, cost, cost + cost);
 237                         break;
 238
 239                   case 7:                       /* impulse cost */
 240                         dist = getfltpar("distance");
 241                         if (dist < 0.0)
 242                                 break;
 243                         cost = 20 + 100 * dist;
 244                         time = dist / 0.095;
 245                         printf("Distance %.2f cost %.2f stardates %d units\n",
 246                                 dist, time, cost);
 247                         break;
 248
 249                   case 8:                       /* distresslist */
 250                         j = 1;
 251                         printf("\n");
 252                         /* scan the event list */
 253                         for (i = 0; i < MAXEVENTS; i++) {
 254                                 e = &Event[i];
 255                                 /* ignore hidden entries */
 256                                 if (e->evcode & E_HIDDEN)
 257                                         continue;
 258                                 switch (e->evcode & E_EVENT) {
 259
 260                                   case E_KDESB:
 261                                         printf("Klingon is attacking starbase "
 262                                                "in quadrant %d,%d\n",
 263                                                 e->x, e->y);
 264                                         j = 0;
 265                                         break;
 266
 267                                   case E_ENSLV:
 268                                   case E_REPRO:
 269                                         printf("Starsystem %s in quadrant "
 270                                                "%d,%d is distressed\n",
 271                                                 Systemname[e->systemname],
 272                                                 e->x, e->y);
 273                                         j = 0;
 274                                         break;
 275                                 }
 276                         }
 277                         if (j)
 278                                 printf("No known distress calls are active\n");
 279                         break;
 280
 281                 }
 282
 283                 /*
 284                  * Skip to next semicolon or newline.  Semicolon
 285                  * means get new computer request; newline means
 286                  * exit computer mode.
 287                  */
 288                 while ((i = getchar()) != ';') {
 289                         if (i == EOF)
 290                                 exit(1);
 291                         if (i == '\n') {
 292                                 ungetc(i, stdin);
 293                                 return;
 294                         }
 295                 }
 296         }
 297 }
 298
 299
 300 /*
 301 **  Course Calculation
 302 **
 303 **      Computes and outputs the course and distance from position
 304 **      sqx,sqy/ssx,ssy to tqx,tqy/tsx,tsy.
 305 */
 306
 307 static int
 308 kalc(int tqx, int tqy, int tsx, int tsy, double *dist)
 309 {
 310         double                  dx, dy;
 311         double                  quadsize;
 312         double                  angle;
 313         int             course;
 314
 315         /* normalize to quadrant distances */
 316         quadsize = NSECTS;
 317         dx = (Ship.quadx + Ship.sectx / quadsize) - (tqx + tsx / quadsize);
 318         dy = (tqy + tsy / quadsize) - (Ship.quady + Ship.secty / quadsize);
 319
 320         /* get the angle */
 321         angle = atan2(dy, dx);
 322         /* make it 0 -> 2 pi */
 323         if (angle < 0.0)
 324                 angle += 6.283185307;
 325         /* convert from radians to degrees */
 326         course = angle * 57.29577951 + 0.5;
 327         dx = dx * dx + dy * dy;
 328         *dist = sqrt(dx);
 329         return (course);
 330 }
 331
 332 static void
 333 prkalc(int course, double dist)
 334 {
 335         printf(": course %d  dist %.3f\n", course, dist);
 336 }