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Annotation of 43BSDReno/games/trek/klmove.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 provided
        !             6:  * that: (1) source distributions retain this entire copyright notice and
        !             7:  * comment, and (2) distributions including binaries display the following
        !             8:  * acknowledgement:  ``This product includes software developed by the
        !             9:  * University of California, Berkeley and its contributors'' in the
        !            10:  * documentation or other materials provided with the distribution and in
        !            11:  * all advertising materials mentioning features or use of this software.
        !            12:  * Neither the name of the University nor the names of its contributors may
        !            13:  * be used to endorse or promote products derived from this software without
        !            14:  * specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
        !            16:  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
        !            17:  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)klmove.c   5.4 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: # include      "trek.h"
        !            25: 
        !            26: /*
        !            27: **  Move Klingons Around
        !            28: **
        !            29: **     This is a largely incomprehensible block of code that moves
        !            30: **     Klingons around in a quadrant.  It was written in a very
        !            31: **     "program as you go" fashion, and is a prime candidate for
        !            32: **     rewriting.
        !            33: **
        !            34: **     The flag `fl' is zero before an attack, one after an attack,
        !            35: **     and two if you are leaving a quadrant.  This serves to
        !            36: **     change the probability and distance that it moves.
        !            37: **
        !            38: **     Basically, what it will try to do is to move a certain number
        !            39: **     of steps either toward you or away from you.  It will avoid
        !            40: **     stars whenever possible.  Nextx and nexty are the next
        !            41: **     sector to move to on a per-Klingon basis; they are roughly
        !            42: **     equivalent to Ship.sectx and Ship.secty for the starship.  Lookx and
        !            43: **     looky are the sector that you are going to look at to see
        !            44: **     if you can move their.  Dx and dy are the increment.  Fudgex
        !            45: **     and fudgey are the things you change around to change your
        !            46: **     course around stars.
        !            47: */
        !            48: 
        !            49: klmove(fl)
        !            50: int    fl;
        !            51: {
        !            52:        int                     n;
        !            53:        register struct kling   *k;
        !            54:        double                  dx, dy;
        !            55:        int                     nextx, nexty;
        !            56:        register int            lookx, looky;
        !            57:        int                     motion;
        !            58:        int                     fudgex, fudgey;
        !            59:        int                     qx, qy;
        !            60:        double                  bigger;
        !            61:        int                     i;
        !            62: 
        !            63: #      ifdef xTRACE
        !            64:        if (Trace)
        !            65:                printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling);
        !            66: #      endif
        !            67:        for (n = 0; n < Etc.nkling; k && n++)
        !            68:        {
        !            69:                k = &Etc.klingon[n];
        !            70:                i = 100;
        !            71:                if (fl)
        !            72:                        i = 100.0 * k->power / Param.klingpwr;
        !            73:                if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl])
        !            74:                        continue;
        !            75:                /* compute distance to move */
        !            76:                motion = ranf(75) - 25;
        !            77:                motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl];
        !            78:                /* compute direction */
        !            79:                dx = Ship.sectx - k->x + ranf(3) - 1;
        !            80:                dy = Ship.secty - k->y + ranf(3) - 1;
        !            81:                bigger = dx;
        !            82:                if (dy > bigger)
        !            83:                        bigger = dy;
        !            84:                if (bigger == 0.0)
        !            85:                        bigger = 1.0;
        !            86:                dx = dx / bigger + 0.5;
        !            87:                dy = dy / bigger + 0.5;
        !            88:                if (motion < 0)
        !            89:                {
        !            90:                        motion = -motion;
        !            91:                        dx = -dx;
        !            92:                        dy = -dy;
        !            93:                }
        !            94:                fudgex = fudgey = 1;
        !            95:                /* try to move the klingon */
        !            96:                nextx = k->x;
        !            97:                nexty = k->y;
        !            98:                for (; motion > 0; motion--)
        !            99:                {
        !           100:                        lookx = nextx + dx;
        !           101:                        looky = nexty + dy;
        !           102:                        if (lookx < 0 || lookx >= NSECTS || looky < 0 || looky >= NSECTS)
        !           103:                        {
        !           104:                                /* new quadrant */
        !           105:                                qx = Ship.quadx;
        !           106:                                qy = Ship.quady;
        !           107:                                if (lookx < 0)
        !           108:                                        qx -= 1;
        !           109:                                else
        !           110:                                        if (lookx >= NSECTS)
        !           111:                                                qx += 1;
        !           112:                                if (looky < 0)
        !           113:                                        qy -= 1;
        !           114:                                else
        !           115:                                        if (looky >= NSECTS)
        !           116:                                                qy += 1;
        !           117:                                if (qx < 0 || qx >= NQUADS || qy < 0 || qy >= NQUADS ||
        !           118:                                                Quad[qx][qy].stars < 0 || Quad[qx][qy].klings > MAXKLQUAD - 1)
        !           119:                                        break;
        !           120:                                if (!damaged(SRSCAN))
        !           121:                                {
        !           122:                                        printf("Klingon at %d,%d escapes to quadrant %d,%d\n",
        !           123:                                                k->x, k->y, qx, qy);
        !           124:                                        motion = Quad[qx][qy].scanned;
        !           125:                                        if (motion >= 0 && motion < 1000)
        !           126:                                                Quad[qx][qy].scanned += 100;
        !           127:                                        motion = Quad[Ship.quadx][Ship.quady].scanned;
        !           128:                                        if (motion >= 0 && motion < 1000)
        !           129:                                                Quad[Ship.quadx][Ship.quady].scanned -= 100;
        !           130:                                }
        !           131:                                Sect[k->x][k->y] = EMPTY;
        !           132:                                Quad[qx][qy].klings += 1;
        !           133:                                Etc.nkling -= 1;
        !           134:                                bmove(&Etc.klingon[Etc.nkling], k, sizeof *k);
        !           135:                                Quad[Ship.quadx][Ship.quady].klings -= 1;
        !           136:                                k = 0;
        !           137:                                break;
        !           138:                        }
        !           139:                        if (Sect[lookx][looky] != EMPTY)
        !           140:                        {
        !           141:                                lookx = nextx + fudgex;
        !           142:                                if (lookx < 0 || lookx >= NSECTS)
        !           143:                                        lookx = nextx + dx;
        !           144:                                if (Sect[lookx][looky] != EMPTY)
        !           145:                                {
        !           146:                                        fudgex = -fudgex;
        !           147:                                        looky = nexty + fudgey;
        !           148:                                        if (looky < 0 || looky >= NSECTS || Sect[lookx][looky] != EMPTY)
        !           149:                                        {
        !           150:                                                fudgey = -fudgey;
        !           151:                                                break;
        !           152:                                        }
        !           153:                                }
        !           154:                        }
        !           155:                        nextx = lookx;
        !           156:                        nexty = looky;
        !           157:                }
        !           158:                if (k && (k->x != nextx || k->y != nexty))
        !           159:                {
        !           160:                        if (!damaged(SRSCAN))
        !           161:                                printf("Klingon at %d,%d moves to %d,%d\n",
        !           162:                                        k->x, k->y, nextx, nexty);
        !           163:                        Sect[k->x][k->y] = EMPTY;
        !           164:                        Sect[k->x = nextx][k->y = nexty] = KLINGON;
        !           165:                }
        !           166:        }
        !           167:        compkldist(0);
        !           168: }

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