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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 <math.h> | |
24 | #include "viking.h" | |
25 | #include "coords.h" | |
26 | #include "vikcoord.h" | |
27 | #include "mapcoord.h" | |
28 | #include "http.h" | |
29 | #include "vikmapslayer.h" | |
30 | ||
31 | #include "osm.h" | |
32 | ||
33 | static guint8 osm_zoom ( gdouble mpp ); | |
34 | ||
35 | static gboolean osm_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ); | |
36 | static void osm_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ); | |
37 | static int osm_maplint_download ( MapCoord *src, const gchar *dest_fn ); | |
38 | static int osm_mapnik_download ( MapCoord *src, const gchar *dest_fn ); | |
39 | static int osm_osmarender_download ( MapCoord *src, const gchar *dest_fn ); | |
40 | ||
41 | static DownloadOptions osm_options = { 1, NULL }; | |
42 | ||
43 | /* initialisation */ | |
44 | void osm_init () { | |
45 | VikMapsLayer_MapType osmarender_type = { 12, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, osm_coord_to_mapcoord, osm_mapcoord_to_center_coord, osm_osmarender_download }; | |
46 | VikMapsLayer_MapType mapnik_type = { 13, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, osm_coord_to_mapcoord, osm_mapcoord_to_center_coord, osm_mapnik_download }; VikMapsLayer_MapType maplint_type = { 14, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, osm_coord_to_mapcoord, osm_mapcoord_to_center_coord, osm_maplint_download }; | |
47 | ||
48 | maps_layer_register_type("OpenStreetMap (Osmarender)", 12, &osmarender_type); | |
49 | maps_layer_register_type("OpenStreetMap (Mapnik)", 13, &mapnik_type); | |
50 | maps_layer_register_type("OpenStreetMap (Maplint)", 14, &maplint_type); | |
51 | } | |
52 | ||
53 | /* 1 << (x) is like a 2**(x) */ | |
54 | #define GZ(x) (1<<(x)) | |
55 | ||
56 | static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9), | |
57 | GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) }; | |
58 | ||
59 | static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])); | |
60 | ||
61 | #define ERROR_MARGIN 0.01 | |
62 | guint8 osm_zoom ( gdouble mpp ) { | |
63 | gint i; | |
64 | for ( i = 0; i < num_scales; i++ ) { | |
65 | if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) | |
66 | return i; | |
67 | } | |
68 | return 255; | |
69 | } | |
70 | ||
71 | static gboolean osm_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) | |
72 | { | |
73 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
74 | ||
75 | if ( xzoom != yzoom ) | |
76 | return FALSE; | |
77 | ||
78 | dest->scale = osm_zoom ( xzoom ); | |
79 | if ( dest->scale == 255 ) | |
80 | return FALSE; | |
81 | ||
82 | dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom; | |
83 | dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom; | |
84 | dest->z = 0; | |
85 | return TRUE; | |
86 | } | |
87 | ||
88 | static void osm_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ) | |
89 | { | |
90 | gdouble socalled_mpp = GZ(src->scale); | |
91 | dest->mode = VIK_COORD_LATLON; | |
92 | dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180; | |
93 | dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360)); | |
94 | } | |
95 | ||
96 | /* Maplint tiles | |
97 | * Ex: http://dev.openstreetmap.org/~ojw/Tiles/maplint.php/10/517/375.png | |
98 | */ | |
99 | static int osm_maplint_download ( MapCoord *src, const gchar *dest_fn ) | |
100 | { | |
101 | int res = -1; | |
102 | gchar *uri = g_strdup_printf ( "/~ojw/Tiles/maplint.php/%d/%d/%d.png", 17-src->scale, src->x, src->y ); | |
103 | res = a_http_download_get_url ( "dev.openstreetmap.org", uri, dest_fn, &osm_options ); | |
104 | g_free ( uri ); | |
105 | return res; | |
106 | } | |
107 | ||
108 | static int osm_mapnik_download ( MapCoord *src, const gchar *dest_fn ) | |
109 | { | |
110 | int res = -1; | |
111 | gchar *uri = g_strdup_printf ( "/osamrender/%d/%d/%d.png", 17-src->scale, src->x, src->y ); | |
112 | res = a_http_download_get_url ( "tile.openstreetmap.org", uri, dest_fn, &osm_options ); | |
113 | g_free ( uri ); | |
114 | return res; | |
115 | } | |
116 | ||
117 | static int osm_osmarender_download ( MapCoord *src, const gchar *dest_fn ) | |
118 | { | |
119 | int res = -1; | |
120 | gchar *uri = g_strdup_printf ( "/~ojw/Tiles/tile.php/%d/%d/%d.png", 17-src->scale, src->x, src->y ); | |
121 | res = a_http_download_get_url ( "dev.openstreetmap.org", uri, dest_fn, &osm_options ); | |
122 | g_free ( uri ); | |
123 | return res; | |
124 | } |