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comparison rotate.c @ 3:5a977ccbc7a9 default tip

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author darius
date Sat, 06 Dec 1997 05:41:29 +0000
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2:fba0b6e6cdc7 3:5a977ccbc7a9
1 /* $Id: rotate.c,v 1.1.1.1 1997/12/06 05:41:30 darius Exp $ */
2
3 /*
4 * rotate.c
5 *
6 */
7 #include "copyright2.h"
8
9 #include <stdio.h>
10 #include <sys/types.h>
11 #ifndef AMIGA /* not that this file needs any network
12 stuff... -JR */
13 #include <sys/socket.h>
14 #include <sys/time.h>
15 #include <netinet/in.h>
16 #include <netinet/tcp.h>
17 #include <netdb.h>
18 #endif
19 #include <math.h>
20 #include <errno.h>
21 #include "Wlib.h"
22 #include "defs.h"
23 #include "struct.h"
24 #include "data.h"
25 #include "packets.h"
26
27 #ifdef ROTATERACE
28
29 void
30 rotate_dir(d, r)
31 unsigned char *d;
32 int r;
33 {
34 (*d) += r;
35 }
36
37 /* general rotation */
38
39 void
40 rotate_coord(x, y, d, cx, cy)
41 int *x, *y; /* values used and returned */
42 int d; /* degree (pi == 128) */
43 int cx, cy; /* around center point */
44 {
45 register
46 int ox, oy;
47
48 ox = *x;
49 oy = *y;
50
51 switch (d) {
52
53 case 0:
54 return;
55
56 case 64:
57 case -192:
58 *x = cy - oy + cx;
59 *y = ox - cx + cy;
60 break;
61
62 case 128:
63 case -128:
64 *x = cx - ox + cx;
65 *y = cy - oy + cy;
66 break;
67
68 case 192:
69 case -64:
70 *x = oy - cy + cx;
71 *y = cx - ox + cy;
72 break;
73
74 default:{
75 /* do it the hard way */
76 /*
77 there is another way to do this, by using the cos(d) and
78 sin(d) and the stock rotation matrix from linear algebra.
79 */
80 double dir;
81 double r, dx, dy;
82 double rd = (double) d * 3.1415927 / 128.;
83
84 if (*x != cx || *y != cy) {
85 dx = (double) (*x - cx);
86 dy = (double) (cy - *y);
87 dir = atan2(dx, dy) - 3.1415927 / 2.;
88 r = hypot(dx, dy);
89 dir += rd;
90 *x = (int) (r * cos(dir) + cx);
91 *y = (int) (r * sin(dir) + cy);
92 }
93 }
94 }
95 }
96
97 void
98 rotate_gcenter(x, y)
99 int *x, *y; /* values used and returned */
100 {
101 rotate_coord(x, y, rotate_deg, blk_gwidth / 2, blk_gwidth / 2);
102 }
103
104 #endif
105
106 void rotate_all()
107 {
108 register i;
109 register struct planet *l;
110 register struct player *j;
111
112 int nplan = (paradise) ? nplanets : 40;
113 int old_rotate_deg = rotate_deg;
114
115 redrawall = 1;
116 reinitPlanets = 1;
117
118 rotate_deg = -old_rotate_deg + rotate * 64;
119
120 for (i = 0, l = planets; i < nplan; i++, l++) {
121 rotate_gcenter(&l->pl_x, &l->pl_y);
122 }
123
124 for (i=0, j = players; i < nplayers; i++, j++) {
125 rotate_gcenter(&j->p_x, &j->p_y);
126 rotate_dir(&j->p_dir, rotate_deg);
127 }
128
129 rotate_deg = rotate * 64;
130 }