usr/src/games/trek/computer.c

#ifndef lint
static char sccsid[] = "@(#)computer.c  4.2     (Berkeley)      %G%";
#endif not lint

# include       "trek.h"
# include       "getpar.h"
# include       <stdio.h>
/*
**  On-Board Computer
**
**      A computer request is fetched from the captain.  The requests
**      are:
**
**      chart -- print a star chart of the known galaxy.  This includes
**              every quadrant that has ever had a long range or
**              a short range scan done of it, plus the location of
**              all starbases.  This is of course updated by any sub-
**              space radio broadcasts (unless the radio is out).
**              The format is the same as that of a long range scan
**              except that ".1." indicates that a starbase exists
**              but we know nothing else.
**
**      trajectory -- gives the course and distance to every know
**              Klingon in the quadrant.  Obviously this fails if the
**              short range scanners are out.
**
**      course -- gives a course computation from whereever you are
**              to any specified location.  If the course begins
**              with a slash, the current quadrant is taken.
**              Otherwise the input is quadrant and sector coordi-
**              nates of the target sector.
**
**      move -- identical to course, except that the move is performed.
**
**      score -- prints out the current score.
**
**      pheff -- "PHaser EFFectiveness" at a given distance.  Tells
**              you how much stuff you need to make it work.
**
**      warpcost -- Gives you the cost in time and units to move for
**              a given distance under a given warp speed.
**
**      impcost -- Same for the impulse engines.
**
**      distresslist -- Gives a list of the currently known starsystems
**              or starbases which are distressed, together with their
**              quadrant coordinates.
**
**      If a command is terminated with a semicolon, you remain in
**      the computer; otherwise, you escape immediately to the main
**      command processor.
*/

struct cvntab   Cputab[] =
{
        "ch",                   "art",                  (int (*)())1,           0,
        "t",                    "rajectory",            (int (*)())2,           0,
        "c",                    "ourse",                (int (*)())3,           0,
        "m",                    "ove",                  (int (*)())3,           1,
        "s",                    "core",                 (int (*)())4,           0,
        "p",                    "heff",                 (int (*)())5,           0,
        "w",                    "arpcost",              (int (*)())6,           0,
        "i",                    "mpcost",               (int (*)())7,           0,
        "d",                    "istresslist",          (int (*)())8,           0,
        0
};

computer()
{
        int                     ix, iy;
        register int            i, j;
        int                     numout;
        int                     tqx, tqy;
        struct cvntab           *r;
        int                     cost;
        int                     course;
        double                  dist, time;
        double                  warpfact;
        struct quad             *q;
        register struct event   *e;

        if (check_out(COMPUTER))
                return;
        while (1)
        {
                r = getcodpar("\nRequest", Cputab);
                switch (r->value)
                {

                  case 1:                       /* star chart */
                        printf("Computer record of galaxy for all long range sensor scans\n\n");
                        printf("  ");
                        /* print top header */
                        for (i = 0; i < NQUADS; i++)
                                printf("-%d- ", i);
                        printf("\n");
                        for (i = 0; i < NQUADS; i++)
                        {
                                printf("%d ", i);
                                for (j = 0; j < NQUADS; j++)
                                {
                                        if (i == Ship.quadx && j == Ship.quady)
                                        {
                                                printf("$$$ ");
                                                continue;
                                        }
                                        q = &Quad[i][j];
                                        /* 1000 or 1001 is special case */
                                        if (q->scanned >= 1000)
                                                if (q->scanned > 1000)
                                                        printf(".1. ");
                                                else
                                                        printf("/// ");
                                        else
                                                if (q->scanned < 0)
                                                        printf("... ");
                                                else
                                                        printf("%3d ", q->scanned);
                                }
                                printf("%d\n", i);
                        }
                        printf("  ");
                        /* print bottom footer */
                        for (i = 0; i < NQUADS; i++)
                                printf("-%d- ", i);
                        printf("\n");
                        break;

                  case 2:                       /* trajectory */
                        if (check_out(SRSCAN))
                        {
                                break;
                        }
                        if (Etc.nkling <= 0)
                        {
                                printf("No Klingons in this quadrant\n");
                                break;
                        }
                        /* for each Klingon, give the course & distance */
                        for (i = 0; i < Etc.nkling; i++)
                        {
                                printf("Klingon at %d,%d", Etc.klingon[i].x, Etc.klingon[i].y);
                                course = kalc(Ship.quadx, Ship.quady, Etc.klingon[i].x, Etc.klingon[i].y, &dist);
                                prkalc(course, dist);
                        }
                        break;

                  case 3:                       /* course calculation */
                        if (readdelim('/'))
                        {
                                tqx = Ship.quadx;
                                tqy = Ship.quady;
                        }
                        else
                        {
                                ix = getintpar("Quadrant");
                                if (ix < 0 || ix >= NSECTS)
                                        break;
                                iy = getintpar("q-y");
                                if (iy < 0 || iy >= NSECTS)
                                        break;
                                tqx = ix;
                                tqy = iy;
                        }
                        ix = getintpar("Sector");
                        if (ix < 0 || ix >= NSECTS)
                                break;
                        iy = getintpar("s-y");
                        if (iy < 0 || iy >= NSECTS)
                                break;
                        course = kalc(tqx, tqy, ix, iy, &dist);
                        if (r->value2)
                        {
                                warp(-1, course, dist);
                                break;
                        }
                        printf("%d,%d/%d,%d to %d,%d/%d,%d",
                                Ship.quadx, Ship.quady, Ship.sectx, Ship.secty, tqx, tqy, ix, iy);
                        prkalc(course, dist);
                        break;

                  case 4:                       /* score */
                        score();
                        break;

                  case 5:                       /* phaser effectiveness */
                        dist = getfltpar("range");
                        if (dist < 0.0)
                                break;
                        dist *= 10.0;
                        cost = pow(0.90, dist) * 98.0 + 0.5;
                        printf("Phasers are %d%% effective at that range\n", cost);
                        break;

                  case 6:                       /* warp cost (time/energy) */
                        dist = getfltpar("distance");
                        if (dist < 0.0)
                                break;
                        warpfact = getfltpar("warp factor");
                        if (warpfact <= 0.0)
                                warpfact = Ship.warp;
                        cost = (dist + 0.05) * warpfact * warpfact * warpfact;
                        time = Param.warptime * dist / (warpfact * warpfact);
                        printf("Warp %.2f distance %.2f cost %.2f stardates %d (%d w/ shlds up) units\n",
                                warpfact, dist, time, cost, cost + cost);
                        break;

                  case 7:                       /* impulse cost */
                        dist = getfltpar("distance");
                        if (dist < 0.0)
                                break;
                        cost = 20 + 100 * dist;
                        time = dist / 0.095;
                        printf("Distance %.2f cost %.2f stardates %d units\n",
                                dist, time, cost);
                        break;

                  case 8:                       /* distresslist */
                        j = 1;
                        printf("\n");
                        /* scan the event list */
                        for (i = 0; i < MAXEVENTS; i++)
                        {
                                e = &Event[i];
                                /* ignore hidden entries */
                                if (e->evcode & E_HIDDEN)
                                        continue;
                                switch (e->evcode & E_EVENT)
                                {

                                  case E_KDESB:
                                        printf("Klingon is attacking starbase in quadrant %d,%d\n",
                                                e->x, e->y);
                                        j = 0;
                                        break;

                                  case E_ENSLV:
                                  case E_REPRO:
                                        printf("Starsystem %s in quadrant %d,%d is distressed\n",
                                                systemname(e), e->x, e->y);
                                        j = 0;
                                        break;
                                }
                        }
                        if (j)
                                printf("No known distress calls are active\n");
                        break;

                }

                /* skip to next semicolon or newline.  Semicolon
                 * means get new computer request; newline means
                 * exit computer mode. */
                while ((i = cgetc(0)) != ';')
                {
                        if (i == '\0')
                                exit(1);
                        if (i == '\n')
                        {
                                ungetc(i, stdin);
                                return;
                        }
                }
        }
}


/*
**  Course Calculation
**
**      Computes and outputs the course and distance from position
**      sqx,sqy/ssx,ssy to tqx,tqy/tsx,tsy.
*/

kalc(tqx, tqy, tsx, tsy, dist)
int     tqx;
int     tqy;
int     tsx;
int     tsy;
double  *dist;
{
        double                  dx, dy;
        double                  quadsize;
        double                  angle;
        register int            course;

        /* normalize to quadrant distances */
        quadsize = NSECTS;
        dx = (Ship.quadx + Ship.sectx / quadsize) - (tqx + tsx / quadsize);
        dy = (tqy + tsy / quadsize) - (Ship.quady + Ship.secty / quadsize);

        /* get the angle */
        angle = atan2(dy, dx);
        /* make it 0 -> 2 pi */
        if (angle < 0.0)
                angle += 6.283185307;
        /* convert from radians to degrees */
        course = angle * 57.29577951 + 0.5;
        dx = dx * dx + dy * dy;
        *dist = sqrt(dx);
        return (course);
}


prkalc(course, dist)
int     course;
double  dist;
{
        printf(": course %d  dist %.3f\n", course, dist);
}