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1 | /* |
2 | * viking -- GPS Data and Topo Analyzer, Explorer, and Manager | |
3 | * | |
4 | * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
19 | * | |
20 | */ | |
21 | ||
22 | #include <gtk/gtk.h> | |
23 | #include <string.h> | |
24 | #include <math.h> | |
25 | #include "coords.h" | |
26 | #include "vikcoord.h" | |
27 | #include "mapcoord.h" | |
28 | #include "http.h" | |
29 | ||
30 | #include "khmaps.h" | |
31 | ||
32 | /* 1 << (x-1) is like a 2**(x-1) */ | |
33 | #define KH(x) ((1<<(x-1))) | |
34 | ||
35 | static const gdouble scale_mpps[] = { KH(1), KH(2), KH(3), KH(4), KH(5), KH(6), KH(7), KH(8), KH(9), | |
36 | KH(10), KH(11), KH(12), KH(13), KH(14), KH(15) }; | |
37 | ||
38 | static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])) - 1; | |
39 | ||
40 | #define ERROR_MARGIN 0.01 | |
41 | guint8 khmaps_zoom ( gdouble mpp ) { | |
42 | gint i; | |
43 | for ( i = 0; i <= num_scales; i++ ) { | |
44 | if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) | |
45 | return i; | |
46 | } | |
47 | return 255; | |
48 | } | |
49 | ||
50 | gboolean khmaps_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) | |
51 | { | |
52 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
53 | ||
54 | if ( xzoom != yzoom ) | |
55 | return FALSE; | |
56 | ||
57 | dest->scale = khmaps_zoom ( xzoom ); | |
58 | if ( dest->scale == 255 ) | |
59 | return FALSE; | |
60 | ||
61 | ||
62 | dest->x = (gint) ((1<<(16 - dest->scale)) + (src->east_west / 180 * (1<<(16-dest->scale)))); | |
63 | dest->y = (gint) ((1<<(16 - dest->scale)) - (src->north_south / 180 * (1<<(16-dest->scale)))); | |
64 | dest->z = 0; | |
65 | return TRUE; | |
66 | } | |
67 | ||
68 | void khmaps_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ) | |
69 | { | |
70 | dest->mode = VIK_COORD_LATLON; | |
71 | dest->east_west = (src->x+0.5 - (1<<(16 - src->scale))) * 180 / (1<<(16-src->scale)); | |
72 | dest->north_south = -((src->y+0.5 - (1<<(16 - src->scale))) * 180 / (1<<(16-src->scale))); | |
73 | } | |
74 | ||
75 | static char *kh_encode(guint32 x, guint32 y, guint8 scale) | |
76 | { | |
77 | gchar *buf = g_malloc ( (20-scale)*sizeof(gchar) ); | |
78 | guint32 ya = 1 << (17 - scale); | |
79 | gint8 i, j; | |
80 | ||
81 | if (y < 0 || (ya-1 < y)) { | |
82 | strcpy(buf,"tqq"); /* BAD */ | |
83 | return buf; | |
84 | } | |
85 | if (x < 0 || ya-1 < x) { | |
86 | x %= ya; | |
87 | if (x < 0) | |
88 | x += ya; | |
89 | } | |
90 | ||
91 | buf[0] = 't'; | |
92 | for (j = 1, i = 16; i >= scale; i--, j++) { | |
93 | ya /= 2; | |
94 | if (y < ya) { | |
95 | if (x < ya) | |
96 | buf[j]='q'; | |
97 | else { | |
98 | buf[j]='r'; | |
99 | x -= ya; | |
100 | } | |
101 | } else { | |
102 | if (x < ya) { | |
103 | buf[j] = 't'; | |
104 | y -= ya; | |
105 | } else { | |
106 | buf[j] = 's'; | |
107 | x -= ya; | |
108 | y -= ya; | |
109 | } | |
110 | } | |
111 | } | |
112 | buf[j] = '\0'; | |
113 | return buf; | |
114 | } | |
115 | ||
116 | void khmaps_download ( MapCoord *src, const gchar *dest_fn ) | |
117 | { | |
118 | gchar *tmp = kh_encode(src->x, src->y, src->scale); | |
119 | gchar *uri = g_strdup_printf ( "/kh?v=2&t=%s", tmp ); | |
120 | g_print("%d %d %d = %s\n", src->x, src->y, src->scale, uri); | |
121 | g_free ( tmp ); | |
122 | a_http_download_get_url ( "kh.google.com", uri, dest_fn ); | |
123 | g_free ( uri ); | |
124 | } | |
125 | ||
126 | /* Popularity has its disadvantages ... */ |