1993-08-02 21:18:41 +04:00
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/*
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* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
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*/
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#ifndef lint
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1995-03-23 11:28:00 +03:00
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static char rcsid[] = "$NetBSD: hack.track.c,v 1.3 1995/03/23 08:31:42 cgd Exp $";
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1993-08-02 21:18:41 +04:00
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#endif /* not lint */
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1993-03-21 12:45:37 +03:00
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#include "hack.h"
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#define UTSZ 50
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coord utrack[UTSZ];
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int utcnt = 0;
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int utpnt = 0;
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initrack(){
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utcnt = utpnt = 0;
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}
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/* add to track */
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settrack(){
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if(utcnt < UTSZ) utcnt++;
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if(utpnt == UTSZ) utpnt = 0;
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utrack[utpnt].x = u.ux;
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utrack[utpnt].y = u.uy;
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utpnt++;
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}
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coord *
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gettrack(x,y) register x,y; {
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register int i,cnt,dist;
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coord tc;
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cnt = utcnt;
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for(i = utpnt-1; cnt--; i--){
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if(i == -1) i = UTSZ-1;
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tc = utrack[i];
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dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
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if(dist < 3)
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return(dist ? &(utrack[i]) : 0);
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}
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return(0);
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}
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