Source:NetHack 1.3d/track.c

Below is the full text to track.c from the source code of NetHack 1.3d. To link to a particular line, write [[NetHack 1.3d/track.c#line123 ]], for example.

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

1.   /*	SCCS Id: @(#)track.c	1.3	87/07/14 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.  }