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Annotation of 43BSDTahoe/games/trek/compkl.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980 Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms are permitted
        !             6:  * provided that the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: static char sccsid[] = "@(#)compkl.c   5.3 (Berkeley) 6/18/88";
        !            20: #endif /* not lint */
        !            21: 
        !            22: # include      "trek.h"
        !            23: 
        !            24: /*
        !            25: **  compute klingon distances
        !            26: **
        !            27: **     The klingon list has the distances for all klingons recomputed
        !            28: **     and sorted.  The parameter is a Boolean flag which is set if
        !            29: **     we have just entered a new quadrant.
        !            30: **
        !            31: **     This routine is used every time the Enterprise or the Klingons
        !            32: **     move.
        !            33: */
        !            34: 
        !            35: compkldist(f)
        !            36: int    f;              /* set if new quadrant */
        !            37: {
        !            38:        register int            i, dx, dy;
        !            39:        double                  d;
        !            40:        double                  temp;
        !            41: 
        !            42:        if (Etc.nkling == 0)
        !            43:                return;
        !            44:        for (i = 0; i < Etc.nkling; i++)
        !            45:        {
        !            46:                /* compute distance to the Klingon */
        !            47:                dx = Ship.sectx - Etc.klingon[i].x;
        !            48:                dy = Ship.secty - Etc.klingon[i].y;
        !            49:                d = dx * dx + dy * dy;
        !            50:                d = sqrt(d);
        !            51: 
        !            52:                /* compute average of new and old distances to Klingon */
        !            53:                if (!f)
        !            54:                {
        !            55:                        temp = Etc.klingon[i].dist;
        !            56:                        Etc.klingon[i].avgdist = 0.5 * (temp + d);
        !            57:                }
        !            58:                else
        !            59:                {
        !            60:                        /* new quadrant: average is current */
        !            61:                        Etc.klingon[i].avgdist = d;
        !            62:                }
        !            63:                Etc.klingon[i].dist = d;
        !            64:        }
        !            65: 
        !            66:        /* leave them sorted */
        !            67:        sortkl();
        !            68: }
        !            69: 
        !            70: 
        !            71: /*
        !            72: **  sort klingons
        !            73: **
        !            74: **     bubble sort on ascending distance
        !            75: */
        !            76: 
        !            77: sortkl()
        !            78: {
        !            79:        struct kling            t;
        !            80:        register int            f, i, m;
        !            81: 
        !            82:        m = Etc.nkling - 1;
        !            83:        f = 1;
        !            84:        while (f)
        !            85:        {
        !            86:                f = 0;
        !            87:                for (i = 0; i < m; i++)
        !            88:                        if (Etc.klingon[i].dist > Etc.klingon[i+1].dist)
        !            89:                        {
        !            90:                                bmove(&Etc.klingon[i], &t, sizeof t);
        !            91:                                bmove(&Etc.klingon[i+1], &Etc.klingon[i], sizeof t);
        !            92:                                bmove(&t, &Etc.klingon[i+1], sizeof t);
        !            93:                                f = 1;
        !            94:                        }
        !            95:        }
        !            96: }

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