Source:NetHack 2.2a/track.c

Below is the full text to track.c from the source code of NetHack 2.2a.

Warning! This is the source code from an old release. For newer releases, see Source code

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1.    /*	SCCS Id: @(#)track.c	1.4	87/08/08
2.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985. */
3.    /* track.c - version 1.0.2 */
4.    
5.    #include "hack.h"
6.    
7.    #define	UTSZ	50
8.    
9.    coord utrack[UTSZ];
10.   int utcnt = 0;
11.   int utpnt = 0;
12.   
13.   initrack(){
14.   	utcnt = utpnt = 0;
15.   }
16.   
17.   /* add to track */
18.   settrack(){
19.   	if(utcnt < UTSZ) utcnt++;
20.   	if(utpnt == UTSZ) utpnt = 0;
21.   	utrack[utpnt].x = u.ux;
22.   	utrack[utpnt].y = u.uy;
23.   	utpnt++;
24.   }
25.   
26.   coord *
27.   gettrack(x,y) register x,y; {
28.   register int i,cnt,dist;
29.   coord tc;
30.   	cnt = utcnt;
31.   	for(i = utpnt-1; cnt--; i--){
32.   		if(i == -1) i = UTSZ-1;
33.   		tc = utrack[i];
34.   		dist = (x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y);
35.   		if(dist < 3)
36.   			return(dist ? &(utrack[i]) : 0);
37.   	}
38.   	return(0);
39.   }