/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.track.c - version 1.0.2 */
/* $FreeBSD: src/games/hack/hack.track.c,v 1.4 1999/11/16 10:26:38 marcel Exp $ */
/* $DragonFly: src/games/hack/hack.track.c,v 1.3 2006/08/21 19:45:32 pavalos Exp $ */

#include "hack.h"

#define	UTSZ	50

coord utrack[UTSZ];
int utcnt = 0;
int utpnt = 0;

void
initrack(void)
{
	utcnt = utpnt = 0;
}

/* add to track */
void
settrack(void)
{
	if(utcnt < UTSZ) utcnt++;
	if(utpnt == UTSZ) utpnt = 0;
	utrack[utpnt].x = u.ux;
	utrack[utpnt].y = u.uy;
	utpnt++;
}

coord *
gettrack(int x, int y)
{
int i,cnt,dst;
coord tc;
	cnt = utcnt;
	for(i = utpnt-1; cnt--; i--){
		if(i == -1) i = UTSZ-1;
		tc = utrack[i];
		dst = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
		if(dst < 3)
			return(dst ? &(utrack[i]) : 0);
	}
	return(0);
}