4.3BSD - /usr/src/games/trek/klmove.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: static char sccsid[] = "@(#)klmove.c	5.1 (Berkeley) 1/29/86";
   9: #endif not lint
  10: 
  11: # include   "trek.h"
  12: 
  13: /*
  14: **  Move Klingons Around
  15: **
  16: **	This is a largely incomprehensible block of code that moves
  17: **	Klingons around in a quadrant.  It was written in a very
  18: **	"program as you go" fashion, and is a prime candidate for
  19: **	rewriting.
  20: **
  21: **	The flag `fl' is zero before an attack, one after an attack,
  22: **	and two if you are leaving a quadrant.  This serves to
  23: **	change the probability and distance that it moves.
  24: **
  25: **	Basically, what it will try to do is to move a certain number
  26: **	of steps either toward you or away from you.  It will avoid
  27: **	stars whenever possible.  Nextx and nexty are the next
  28: **	sector to move to on a per-Klingon basis; they are roughly
  29: **	equivalent to Ship.sectx and Ship.secty for the starship.  Lookx and
  30: **	looky are the sector that you are going to look at to see
  31: **	if you can move their.  Dx and dy are the increment.  Fudgex
  32: **	and fudgey are the things you change around to change your
  33: **	course around stars.
  34: */
  35: 
  36: klmove(fl)
  37: int fl;
  38: {
  39:     int         n;
  40:     register struct kling   *k;
  41:     double          dx, dy;
  42:     int         nextx, nexty;
  43:     register int        lookx, looky;
  44:     int         motion;
  45:     int         fudgex, fudgey;
  46:     int         qx, qy;
  47:     double          bigger;
  48:     int         i;
  49: 
  50: #	ifdef xTRACE
  51:     if (Trace)
  52:         printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling);
  53: #	endif
  54:     for (n = 0; n < Etc.nkling; k && n++)
  55:     {
  56:         k = &Etc.klingon[n];
  57:         i = 100;
  58:         if (fl)
  59:             i = 100.0 * k->power / Param.klingpwr;
  60:         if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl])
  61:             continue;
  62:         /* compute distance to move */
  63:         motion = ranf(75) - 25;
  64:         motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl];
  65:         /* compute direction */
  66:         dx = Ship.sectx - k->x + ranf(3) - 1;
  67:         dy = Ship.secty - k->y + ranf(3) - 1;
  68:         bigger = dx;
  69:         if (dy > bigger)
  70:             bigger = dy;
  71:         if (bigger == 0.0)
  72:             bigger = 1.0;
  73:         dx = dx / bigger + 0.5;
  74:         dy = dy / bigger + 0.5;
  75:         if (motion < 0)
  76:         {
  77:             motion = -motion;
  78:             dx = -dx;
  79:             dy = -dy;
  80:         }
  81:         fudgex = fudgey = 1;
  82:         /* try to move the klingon */
  83:         nextx = k->x;
  84:         nexty = k->y;
  85:         for (; motion > 0; motion--)
  86:         {
  87:             lookx = nextx + dx;
  88:             looky = nexty + dy;
  89:             if (lookx < 0 || lookx >= NSECTS || looky < 0 || looky >= NSECTS)
  90:             {
  91:                 /* new quadrant */
  92:                 qx = Ship.quadx;
  93:                 qy = Ship.quady;
  94:                 if (lookx < 0)
  95:                     qx -= 1;
  96:                 else
  97:                     if (lookx >= NSECTS)
  98:                         qx += 1;
  99:                 if (looky < 0)
 100:                     qy -= 1;
 101:                 else
 102:                     if (looky >= NSECTS)
 103:                         qy += 1;
 104:                 if (qx < 0 || qx >= NQUADS || qy < 0 || qy >= NQUADS ||
 105:                         Quad[qx][qy].stars < 0 || Quad[qx][qy].klings > MAXKLQUAD - 1)
 106:                     break;
 107:                 if (!damaged(SRSCAN))
 108:                 {
 109:                     printf("Klingon at %d,%d escapes to quadrant %d,%d\n",
 110:                         k->x, k->y, qx, qy);
 111:                     motion = Quad[qx][qy].scanned;
 112:                     if (motion >= 0 && motion < 1000)
 113:                         Quad[qx][qy].scanned += 100;
 114:                     motion = Quad[Ship.quadx][Ship.quady].scanned;
 115:                     if (motion >= 0 && motion < 1000)
 116:                         Quad[Ship.quadx][Ship.quady].scanned -= 100;
 117:                 }
 118:                 Sect[k->x][k->y] = EMPTY;
 119:                 Quad[qx][qy].klings += 1;
 120:                 Etc.nkling -= 1;
 121:                 bmove(&Etc.klingon[Etc.nkling], k, sizeof *k);
 122:                 Quad[Ship.quadx][Ship.quady].klings -= 1;
 123:                 k = 0;
 124:                 break;
 125:             }
 126:             if (Sect[lookx][looky] != EMPTY)
 127:             {
 128:                 lookx = nextx + fudgex;
 129:                 if (lookx < 0 || lookx >= NSECTS)
 130:                     lookx = nextx + dx;
 131:                 if (Sect[lookx][looky] != EMPTY)
 132:                 {
 133:                     fudgex = -fudgex;
 134:                     looky = nexty + fudgey;
 135:                     if (looky < 0 || looky >= NSECTS || Sect[lookx][looky] != EMPTY)
 136:                     {
 137:                         fudgey = -fudgey;
 138:                         break;
 139:                     }
 140:                 }
 141:             }
 142:             nextx = lookx;
 143:             nexty = looky;
 144:         }
 145:         if (k && (k->x != nextx || k->y != nexty))
 146:         {
 147:             if (!damaged(SRSCAN))
 148:                 printf("Klingon at %d,%d moves to %d,%d\n",
 149:                     k->x, k->y, nextx, nexty);
 150:             Sect[k->x][k->y] = EMPTY;
 151:             Sect[k->x = nextx][k->y = nexty] = KLINGON;
 152:         }
 153:     }
 154:     compkldist(0);
 155: }

Defined functions

Defined variables