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/*
* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
*/
#ifndef lint
static char rcsid[] = "$NetBSD: hack.track.c,v 1.3 1995/03/23 08:31:42 cgd Exp $";
#endif /* not lint */
#include "hack.h"
#define UTSZ 50
coord utrack[UTSZ];
int utcnt = 0;
int utpnt = 0;
initrack(){
utcnt = utpnt = 0;
}
/* add to track */
settrack(){
if(utcnt < UTSZ) utcnt++;
if(utpnt == UTSZ) utpnt = 0;
utrack[utpnt].x = u.ux;
utrack[utpnt].y = u.uy;
utpnt++;
}
coord *
gettrack(x,y) register x,y; {
register int i,cnt,dist;
coord tc;
cnt = utcnt;
for(i = utpnt-1; cnt--; i--){
if(i == -1) i = UTSZ-1;
tc = utrack[i];
dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
if(dist < 3)
return(dist ? &(utrack[i]) : 0);
}
return(0);
}
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