blob: f6abe29729a514a464809cf74289b846aa6272c2 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
|
/* $NetBSD: hack.track.c,v 1.4 1997/10/19 16:59:11 christos Exp $ */
/*
* Copyright (c) Stichting Mathematisch Centrum, Amsterdam, 1985.
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: hack.track.c,v 1.4 1997/10/19 16:59:11 christos Exp $");
#endif /* not lint */
#include "hack.h"
#include "extern.h"
#define UTSZ 50
coord utrack[UTSZ];
int utcnt = 0;
int utpnt = 0;
void
initrack()
{
utcnt = utpnt = 0;
}
/* add to track */
void
settrack()
{
if (utcnt < UTSZ)
utcnt++;
if (utpnt == UTSZ)
utpnt = 0;
utrack[utpnt].x = u.ux;
utrack[utpnt].y = u.uy;
utpnt++;
}
coord *
gettrack(x, y)
int x, y;
{
int i, cnt, dist;
coord tc;
cnt = utcnt;
for (i = utpnt - 1; cnt--; i--) {
if (i == -1)
i = UTSZ - 1;
tc = utrack[i];
dist = (x - tc.x) * (x - tc.x) + (y - tc.y) * (y - tc.y);
if (dist < 3)
return (dist ? &(utrack[i]) : 0);
}
return (0);
}
|
