57 lines
953 B
C
57 lines
953 B
C
/* $NetBSD: hack.track.c,v 1.4 1997/10/19 16:59:11 christos Exp $ */
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/*
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* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: hack.track.c,v 1.4 1997/10/19 16:59:11 christos Exp $");
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#endif /* not lint */
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#include "hack.h"
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#include "extern.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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void
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initrack()
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{
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utcnt = utpnt = 0;
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}
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/* add to track */
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void
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settrack()
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{
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if (utcnt < UTSZ)
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utcnt++;
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if (utpnt == UTSZ)
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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)
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int x, y;
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{
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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)
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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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