usr/othersrc/games/hack/hack.track.c

/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
/* hack.track.c - version 1.0.2 */

#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);
}