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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)computer.c       8.1 (Berkeley) 5/31/93
  30  * $FreeBSD: src/games/trek/computer.c,v 1.5 1999/11/30 03:49:45 billf Exp $
  31  * $DragonFly: src/games/trek/computer.c,v 1.3 2006/09/07 21:19:44 pavalos Exp $
  32  */
  33
  34 #include "trek.h"
  35 #include "getpar.h"
  36
  37 static int kalc(int, int, int, int, double *);
  38 static void prkalc(int, double);
  39
  40 /*
  41 **  On-Board Computer
  42 **
  43 **      A computer request is fetched from the captain.  The requests
  44 **      are:
  45 **
  46 **      chart -- print a star chart of the known galaxy.  This includes
  47 **              every quadrant that has ever had a long range or
  48 **              a short range scan done of it, plus the location of
  49 **              all starbases.  This is of course updated by any sub-
  50 **              space radio broadcasts (unless the radio is out).
  51 **              The format is the same as that of a long range scan
  52 **              except that ".1." indicates that a starbase exists
  53 **              but we know nothing else.
  54 **
  55 **      trajectory -- gives the course and distance to every know
  56 **              Klingon in the quadrant.  Obviously this fails if the
  57 **              short range scanners are out.
  58 **
  59 **      course -- gives a course computation from whereever you are
  60 **              to any specified location.  If the course begins
  61 **              with a slash, the current quadrant is taken.
  62 **              Otherwise the input is quadrant and sector coordi-
  63 **              nates of the target sector.
  64 **
  65 **      move -- identical to course, except that the move is performed.
  66 **
  67 **      score -- prints out the current score.
  68 **
  69 **      pheff -- "PHaser EFFectiveness" at a given distance.  Tells
  70 **              you how much stuff you need to make it work.
  71 **
  72 **      warpcost -- Gives you the cost in time and units to move for
  73 **              a given distance under a given warp speed.
  74 **
  75 **      impcost -- Same for the impulse engines.
  76 **
  77 **      distresslist -- Gives a list of the currently known starsystems
  78 **              or starbases which are distressed, together with their
  79 **              quadrant coordinates.
  80 **
  81 **      If a command is terminated with a semicolon, you remain in
  82 **      the computer; otherwise, you escape immediately to the main
  83 **      command processor.
  84 */
  85
  86 struct cvntab Cputab[] = {
  87         { "ch", "art",                  (cmdfun)1,              0 },
  88         { "t",  "rajectory",            (cmdfun)2,              0 },
  89         { "c",  "ourse",                (cmdfun)3,              0 },
  90         { "m",  "ove",                  (cmdfun)3,              1 },
  91         { "s",  "core",                 (cmdfun)4,              0 },
  92         { "p",  "heff",                 (cmdfun)5,              0 },
  93         { "w",  "arpcost",              (cmdfun)6,              0 },
  94         { "i",  "mpcost",               (cmdfun)7,              0 },
  95         { "d",  "istresslist",          (cmdfun)8,              0 },
  96         { NULL, NULL,                   NULL,                   0 }
  97 };
  98
  99 void
 100 computer(int v __unused)
 101 {
 102         int             ix, iy;
 103         int             i, j;
 104         int             tqx, tqy;
 105         struct cvntab           *r;
 106         int             cost;
 107         int             course;
 108         double          dist, p_time;
 109         double          warpfact;
 110         struct quad     *q;
 111         struct event    *e;
 112
 113         if (check_out(COMPUTER))
 114                 return;
 115         while (1) {
 116                 r = getcodpar("\nRequest", Cputab);
 117                 switch ((long)r->value) {
 118
 119                   case 1:                       /* star chart */
 120                         printf("Computer record of galaxy for all long range sensor scans\n\n");
 121                         printf("  ");
 122                         /* print top header */
 123                         for (i = 0; i < NQUADS; i++)
 124                                 printf("-%d- ", i);
 125                         printf("\n");
 126                         for (i = 0; i < NQUADS; i++) {
 127                                 printf("%d ", i);
 128                                 for (j = 0; j < NQUADS; j++) {
 129                                         if (i == Ship.quadx && j == Ship.quady)
 130                                         {
 131                                                 printf("$$$ ");
 132                                                 continue;
 133                                         }
 134                                         q = &Quad[i][j];
 135                                         /* 1000 or 1001 is special case */
 136                                         if (q->scanned >= 1000)
 137                                                 if (q->scanned > 1000)
 138                                                         printf(".1. ");
 139                                                 else
 140                                                         printf("/// ");
 141                                         else
 142                                                 if (q->scanned < 0)
 143                                                         printf("... ");
 144                                                 else
 145                                                         printf("%3d ", q->scanned);
 146                                 }
 147                                 printf("%d\n", i);
 148                         }
 149                         printf("  ");
 150                         /* print bottom footer */
 151                         for (i = 0; i < NQUADS; i++)
 152                                 printf("-%d- ", i);
 153                         printf("\n");
 154                         break;
 155
 156                   case 2:                       /* trajectory */
 157                         if (check_out(SRSCAN)) {
 158                                 break;
 159                         }
 160                         if (Etc.nkling <= 0) {
 161                                 printf("No Klingons in this quadrant\n");
 162                                 break;
 163                         }
 164                         /* for each Klingon, give the course & distance */
 165                         for (i = 0; i < Etc.nkling; i++) {
 166                                 printf("Klingon at %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
 167                                 course = kalc(Ship.quadx, Ship.quady, Etc.klingon[i].x, Etc.klingon[i].y, &dist);
 168                                 prkalc(course, dist);
 169                         }
 170                         break;
 171
 172                   case 3:                       /* course calculation */
 173                         if (readdelim('/')) {
 174                                 tqx = Ship.quadx;
 175                                 tqy = Ship.quady;
 176                         } else {
 177                                 ix = getintpar("Quadrant");
 178                                 if (ix < 0 || ix >= NSECTS)
 179                                         break;
 180                                 iy = getintpar("q-y");
 181                                 if (iy < 0 || iy >= NSECTS)
 182                                         break;
 183                                 tqx = ix;
 184                                 tqy = iy;
 185                         }
 186                         ix = getintpar("Sector");
 187                         if (ix < 0 || ix >= NSECTS)
 188                                 break;
 189                         iy = getintpar("s-y");
 190                         if (iy < 0 || iy >= NSECTS)
 191                                 break;
 192                         course = kalc(tqx, tqy, ix, iy, &dist);
 193                         if (r->value2) {
 194                                 warp(-1, course, dist);
 195                                 break;
 196                         }
 197                         printf("%d,%d/%d,%d to %d,%d/%d,%d",
 198                                 Ship.quadx, Ship.quady, Ship.sectx, Ship.secty, tqx, tqy, ix, iy);
 199                         prkalc(course, dist);
 200                         break;
 201
 202                   case 4:                       /* score */
 203                         score();
 204                         break;
 205
 206                   case 5:                       /* phaser effectiveness */
 207                         dist = getfltpar("range");
 208                         if (dist < 0.0)
 209                                 break;
 210                         dist *= 10.0;
 211                         cost = pow(0.90, dist) * 98.0 + 0.5;
 212                         printf("Phasers are %d%% effective at that range\n", cost);
 213                         break;
 214
 215                   case 6:                       /* warp cost (time/energy) */
 216                         dist = getfltpar("distance");
 217                         if (dist < 0.0)
 218                                 break;
 219                         warpfact = getfltpar("warp factor");
 220                         if (warpfact <= 0.0)
 221                                 warpfact = Ship.warp;
 222                         cost = (dist + 0.05) * warpfact * warpfact * warpfact;
 223                         p_time = Param.warptime * dist / (warpfact * warpfact);
 224                         printf("Warp %.2f distance %.2f cost %.2f stardates %d (%d w/ shlds up) units\n",
 225                                 warpfact, dist, p_time, cost, cost + cost);
 226                         break;
 227
 228                   case 7:                       /* impulse cost */
 229                         dist = getfltpar("distance");
 230                         if (dist < 0.0)
 231                                 break;
 232                         cost = 20 + 100 * dist;
 233                         p_time = dist / 0.095;
 234                         printf("Distance %.2f cost %.2f stardates %d units\n",
 235                                 dist, p_time, cost);
 236                         break;
 237
 238                   case 8:                       /* distresslist */
 239                         j = 1;
 240                         printf("\n");
 241                         /* scan the event list */
 242                         for (i = 0; i < MAXEVENTS; i++) {
 243                                 e = &Event[i];
 244                                 /* ignore hidden entries */
 245                                 if (e->evcode & E_HIDDEN)
 246                                         continue;
 247                                 switch (e->evcode & E_EVENT) {
 248
 249                                   case E_KDESB:
 250                                         printf("Klingon is attacking starbase in quadrant %d,%d\n",
 251                                                 e->x, e->y);
 252                                         j = 0;
 253                                         break;
 254
 255                                   case E_ENSLV:
 256                                   case E_REPRO:
 257                                         printf("Starsystem %s in quadrant %d,%d is distressed\n",
 258                                                 Systemname[e->systemname], e->x, e->y);
 259                                         j = 0;
 260                                         break;
 261                                 }
 262                         }
 263                         if (j)
 264                                 printf("No known distress calls are active\n");
 265                         break;
 266
 267                 }
 268
 269                 /*
 270                  * Skip to next semicolon or newline.  Semicolon
 271                  * means get new computer request; newline means
 272                  * exit computer mode.
 273                  */
 274                 while ((i = cgetc(0)) != ';') {
 275                         if (i == '\0')
 276                                 exit(1);
 277                         if (i == '\n') {
 278                                 ungetc(i, stdin);
 279                                 return;
 280                         }
 281                 }
 282         }
 283 }
 284
 285
 286 /*
 287 **  Course Calculation
 288 **
 289 **      Computes and outputs the course and distance from position
 290 **      sqx,sqy/ssx,ssy to tqx,tqy/tsx,tsy.
 291 */
 292
 293 static int
 294 kalc(int tqx, int tqy, int tsx, int tsy, double *dist)
 295 {
 296         double                  dx, dy;
 297         double                  quadsize;
 298         double                  angle;
 299         int             course;
 300
 301         /* normalize to quadrant distances */
 302         quadsize = NSECTS;
 303         dx = (Ship.quadx + Ship.sectx / quadsize) - (tqx + tsx / quadsize);
 304         dy = (tqy + tsy / quadsize) - (Ship.quady + Ship.secty / quadsize);
 305
 306         /* get the angle */
 307         angle = atan2(dy, dx);
 308         /* make it 0 -> 2 pi */
 309         if (angle < 0.0)
 310                 angle += 6.283185307;
 311         /* convert from radians to degrees */
 312         course = angle * 57.29577951 + 0.5;
 313         dx = dx * dx + dy * dy;
 314         *dist = sqrt(dx);
 315         return (course);
 316 }
 317
 318 static void
 319 prkalc(int course, double dist)
 320 {
 321         printf(": course %d  dist %.3f\n", course, dist);
 322 }