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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 "download.h" | |
29 | #include "vikmapslayer.h" | |
30 | ||
31 | #include "terraserver.h" | |
32 | ||
33 | static gboolean terraserver_topo_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest ); | |
34 | static int terraserver_topo_download ( MapCoord *src, const gchar *dest_fn ); | |
35 | ||
36 | static gboolean terraserver_aerial_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest ); | |
37 | static int terraserver_aerial_download ( MapCoord *src, const gchar *dest_fn ); | |
38 | ||
39 | static gboolean terraserver_urban_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest ); | |
40 | static int terraserver_urban_download ( MapCoord *src, const gchar *dest_fn ); | |
41 | ||
42 | static void terraserver_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ); | |
43 | ||
44 | static DownloadOptions terraserver_options = { 0, NULL }; | |
45 | ||
46 | void terraserver_init () { | |
47 | VikMapsLayer_MapType map_type_1 = { 2, 200, 200, VIK_VIEWPORT_DRAWMODE_UTM, terraserver_topo_coord_to_mapcoord, terraserver_mapcoord_to_center_coord, terraserver_topo_download }; | |
48 | VikMapsLayer_MapType map_type_2 = { 1, 200, 200, VIK_VIEWPORT_DRAWMODE_UTM, terraserver_aerial_coord_to_mapcoord, terraserver_mapcoord_to_center_coord, terraserver_aerial_download }; | |
49 | VikMapsLayer_MapType map_type_3 = { 4, 200, 200, VIK_VIEWPORT_DRAWMODE_UTM, terraserver_urban_coord_to_mapcoord, terraserver_mapcoord_to_center_coord, terraserver_urban_download }; | |
50 | ||
51 | maps_layer_register_type("Terraserver Topos", 2, &map_type_1); | |
52 | maps_layer_register_type("Terraserver Aerials", 1, &map_type_2); | |
53 | maps_layer_register_type("Terraserver Urban Areas", 4, &map_type_3); | |
54 | } | |
55 | ||
56 | #define TERRASERVER_SITE "terraserver-usa.com" | |
57 | #define MARGIN_OF_ERROR 0.001 | |
58 | ||
59 | static int mpp_to_scale ( gdouble mpp, guint8 type ) | |
60 | { | |
61 | mpp *= 4; | |
62 | gint t = (gint) mpp; | |
63 | if ( ABS(mpp - t) > MARGIN_OF_ERROR ) | |
64 | return FALSE; | |
65 | ||
66 | switch ( t ) { | |
67 | case 1: return (type == 4) ? 8 : 0; | |
68 | case 2: return (type == 4) ? 9 : 0; | |
69 | case 4: return (type != 2) ? 10 : 0; | |
70 | case 8: return 11; | |
71 | case 16: return 12; | |
72 | case 32: return 13; | |
73 | case 64: return 14; | |
74 | case 128: return 15; | |
75 | case 256: return 16; | |
76 | case 512: return 17; | |
77 | case 1024: return 18; | |
78 | case 2048: return 19; | |
79 | default: return 0; | |
80 | } | |
81 | } | |
82 | ||
83 | static gdouble scale_to_mpp ( gint scale ) | |
84 | { | |
85 | return pow(2,scale - 10); | |
86 | } | |
87 | ||
88 | static gboolean terraserver_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest, guint8 type ) | |
89 | { | |
90 | g_assert ( src->mode == VIK_COORD_UTM ); | |
91 | ||
92 | if ( xmpp != ympp ) | |
93 | return FALSE; | |
94 | ||
95 | dest->scale = mpp_to_scale ( xmpp, type ); | |
96 | if ( ! dest->scale ) | |
97 | return FALSE; | |
98 | ||
99 | dest->x = (gint)(((gint)(src->east_west))/(200*xmpp)); | |
100 | dest->y = (gint)(((gint)(src->north_south))/(200*xmpp)); | |
101 | dest->z = src->utm_zone; | |
102 | return TRUE; | |
103 | } | |
104 | ||
105 | static gboolean terraserver_topo_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest ) | |
106 | { return terraserver_coord_to_mapcoord ( src, xmpp, ympp, dest, 2 ); } | |
107 | static gboolean terraserver_aerial_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest ) | |
108 | { return terraserver_coord_to_mapcoord ( src, xmpp, ympp, dest, 1 ); } | |
109 | static gboolean terraserver_urban_coord_to_mapcoord ( const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest ) | |
110 | { return terraserver_coord_to_mapcoord ( src, xmpp, ympp, dest, 4 ); } | |
111 | ||
112 | static void terraserver_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ) | |
113 | { | |
114 | // FIXME: slowdown here! | |
115 | gdouble mpp = scale_to_mpp ( src->scale ); | |
116 | dest->mode = VIK_COORD_UTM; | |
117 | dest->utm_zone = src->z; | |
118 | dest->east_west = ((src->x * 200) + 100) * mpp; | |
119 | dest->north_south = ((src->y * 200) + 100) * mpp; | |
120 | } | |
121 | ||
122 | static int terraserver_download ( MapCoord *src, const gchar *dest_fn, guint8 type ) | |
123 | { | |
124 | int res = -1; | |
125 | gchar *uri = g_strdup_printf ( "/tile.ashx?T=%d&S=%d&X=%d&Y=%d&Z=%d", type, | |
126 | src->scale, src->x, src->y, src->z ); | |
127 | res = a_http_download_get_url ( TERRASERVER_SITE, uri, dest_fn, &terraserver_options ); | |
128 | g_free ( uri ); | |
129 | return(res); | |
130 | } | |
131 | ||
132 | static int terraserver_topo_download ( MapCoord *src, const gchar *dest_fn ) | |
133 | { return terraserver_download ( src, dest_fn, 2 ); } | |
134 | static int terraserver_aerial_download ( MapCoord *src, const gchar *dest_fn ) | |
135 | { return terraserver_download ( src, dest_fn, 1 ); } | |
136 | static int terraserver_urban_download ( MapCoord *src, const gchar *dest_fn ) | |
137 | { return terraserver_download ( src, dest_fn, 4 ); } |