39 lines
656 B
C
39 lines
656 B
C
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/* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
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/* hack.track.c - version 1.0.2 */
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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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