written by Eric Allman; add Berkeley header

[unix-history] / usr / src / games / trek / visual.c

/*
* Copyright (c) 1980 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that this notice is preserved and that due credit is given
* to the University of California at Berkeley. The name of the University
* may not be used to endorse or promote products derived from this
* software without specific prior written permission. This software
* is provided ``as is'' without express or implied warranty.
*/

#ifndef lint
static char sccsid[] = "@(#)visual.c    5.2 (Berkeley) %G%";
#endif /* not lint */

# include       "trek.h"

/*
**  VISUAL SCAN
**
**      A visual scan is made in a particular direction of three sectors
**      in the general direction specified.  This takes time, and
**      Klingons can attack you, so it should be done only when sensors
**      are out.
*/

/* This struct[] has the delta x, delta y for particular directions */
struct xy       Visdelta[11] =
{
       -1,     -1,
       -1,      0,
       -1,      1,
        0,      1,
        1,      1,
        1,      0,
        1,     -1,
        0,     -1,
       -1,     -1,
       -1,      0,
       -1,      1
};

visual()
{
       register int            ix, iy;
       int                     co;
       register struct xy      *v;

       co = getintpar("direction");
       if (co < 0 || co > 360)
               return;
       co = (co + 22) / 45;
       v = &Visdelta[co];
       ix = Ship.sectx + v->x;
       iy = Ship.secty + v->y;
       if (ix < 0 || ix >= NSECTS || iy < 0 || iy >= NSECTS)
               co = '?';
       else
               co = Sect[ix][iy];
       printf("%d,%d %c ", ix, iy, co);
       v++;
       ix = Ship.sectx + v->x;
       iy = Ship.secty + v->y;
       if (ix < 0 || ix >= NSECTS || iy < 0 || iy >= NSECTS)
               co = '?';
       else
               co = Sect[ix][iy];
       printf("%c ", co);
       v++;
       ix = Ship.sectx + v->x;
       iy = Ship.secty + v->y;
       if (ix < 0 || ix >= NSECTS || iy < 0 || iy >= NSECTS)
               co = '?';
       else
               co = Sect[ix][iy];
       printf("%c %d,%d\n", co, ix, iy);
       Move.time = 0.05;
       Move.free = 0;
}