Source:Hack 1.0/hack.track.c

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Below is the full text to hack.track.c from the source code of Hack 1.0. To link to a particular line, write [[Hack 1.0/hack.track.c#line123]], for example.

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

Screenshots and source code from Hack are used under the CWI license.

1.    /* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1984. */
2.    
3.    #include "hack.h"
4.    #ifdef TRACK
5.    #define	UTSZ	50
6.    
7.    coord utrack[UTSZ];
8.    int utcnt = 0;
9.    int utpnt = 0;
10.   
11.   initrack(){
12.   	utcnt = utpnt = 0;
13.   }
14.   
15.   /* add to track */
16.   settrack(){
17.   	if(utcnt < UTSZ) utcnt++;
18.   	if(utpnt == UTSZ) utpnt = 0;
19.   	utrack[utpnt].x = u.ux;
20.   	utrack[utpnt].y = u.uy;
21.   	utpnt++;
22.   }
23.   
24.   coord *
25.   gettrack(x,y) register x,y; {
26.   register int i,cnt;
27.   coord tc;
28.   	cnt = utcnt;
29.   	for(i = utpnt-1; cnt--; i--){
30.   		if(i == -1) i = UTSZ-1;
31.   		tc = utrack[i];
32.   		if((x-tc.x)*(x-tc.x) + (y-tc.y)*(y-tc.y) < 3)
33.   			return(&(utrack[i]));
34.   	}
35.    return(0);
36.   }
37.   #endif TRACK