# 2.11BSD/src/games/trek/klmove.c

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```/*
* Copyright (c) 1980 Regents of the University of California.
* specifies the terms and conditions for redistribution.
*/

#ifndef lint
static char sccsid[] = "@(#)klmove.c	5.1 (Berkeley) 1/29/86";
#endif not lint

# include	"trek.h"

/*
**  Move Klingons Around
**
**	This is a largely incomprehensible block of code that moves
**	Klingons around in a quadrant.  It was written in a very
**	"program as you go" fashion, and is a prime candidate for
**	rewriting.
**
**	The flag `fl' is zero before an attack, one after an attack,
**	and two if you are leaving a quadrant.  This serves to
**	change the probability and distance that it moves.
**
**	Basically, what it will try to do is to move a certain number
**	of steps either toward you or away from you.  It will avoid
**	stars whenever possible.  Nextx and nexty are the next
**	sector to move to on a per-Klingon basis; they are roughly
**	equivalent to Ship.sectx and Ship.secty for the starship.  Lookx and
**	looky are the sector that you are going to look at to see
**	if you can move their.  Dx and dy are the increment.  Fudgex
**	and fudgey are the things you change around to change your
**	course around stars.
*/

klmove(fl)
int	fl;
{
int			n;
register struct kling	*k;
double			dx, dy;
int			nextx, nexty;
register int		lookx, looky;
int			motion;
int			fudgex, fudgey;
int			qx, qy;
double			bigger;
int			i;

#	ifdef xTRACE
if (Trace)
printf("klmove: fl = %d, Etc.nkling = %d\n", fl, Etc.nkling);
#	endif
for (n = 0; n < Etc.nkling; k && n++)
{
k = &Etc.klingon[n];
i = 100;
if (fl)
i = 100.0 * k->power / Param.klingpwr;
if (ranf(i) >= Param.moveprob[2 * Move.newquad + fl])
continue;
/* compute distance to move */
motion = ranf(75) - 25;
motion *= k->avgdist * Param.movefac[2 * Move.newquad + fl];
/* compute direction */
dx = Ship.sectx - k->x + ranf(3) - 1;
dy = Ship.secty - k->y + ranf(3) - 1;
bigger = dx;
if (dy > bigger)
bigger = dy;
if (bigger == 0.0)
bigger = 1.0;
dx = dx / bigger + 0.5;
dy = dy / bigger + 0.5;
if (motion < 0)
{
motion = -motion;
dx = -dx;
dy = -dy;
}
fudgex = fudgey = 1;
/* try to move the klingon */
nextx = k->x;
nexty = k->y;
for (; motion > 0; motion--)
{
lookx = nextx + dx;
looky = nexty + dy;
if (lookx < 0 || lookx >= NSECTS || looky < 0 || looky >= NSECTS)
{
if (lookx < 0)
qx -= 1;
else
if (lookx >= NSECTS)
qx += 1;
if (looky < 0)
qy -= 1;
else
if (looky >= NSECTS)
qy += 1;
if (qx < 0 || qx >= NQUADS || qy < 0 || qy >= NQUADS ||
break;
if (!damaged(SRSCAN))
{
printf("Klingon at %d,%d escapes to quadrant %d,%d\n",
k->x, k->y, qx, qy);
if (motion >= 0 && motion < 1000)
if (motion >= 0 && motion < 1000)
}
Sect[k->x][k->y] = EMPTY;
Etc.nkling -= 1;
bmove(&Etc.klingon[Etc.nkling], k, sizeof *k);
k = 0;
break;
}
if (Sect[lookx][looky] != EMPTY)
{
lookx = nextx + fudgex;
if (lookx < 0 || lookx >= NSECTS)
lookx = nextx + dx;
if (Sect[lookx][looky] != EMPTY)
{
fudgex = -fudgex;
looky = nexty + fudgey;
if (looky < 0 || looky >= NSECTS || Sect[lookx][looky] != EMPTY)
{
fudgey = -fudgey;
break;
}
}
}
nextx = lookx;
nexty = looky;
}
if (k && (k->x != nextx || k->y != nexty))
{
if (!damaged(SRSCAN))
printf("Klingon at %d,%d moves to %d,%d\n",
k->x, k->y, nextx, nexty);
Sect[k->x][k->y] = EMPTY;
Sect[k->x = nextx][k->y = nexty] = KLINGON;
}
}
compkldist(0);
}
```