projects / andy / viking.git / blame
| Commit | Line | Data |
|---|---|---|
| 50a14534 EB |
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> | |
| 79845167 | 24 | #include "viking.h" |
| 50a14534 EB |
25 | #include "coords.h" |
| 26 | #include "vikcoord.h" | |
| 27 | #include "mapcoord.h" | |
| 85611cd9 | 28 | #include "download.h" |
| cdcaf41c | 29 | #include "vikmapslayer.h" |
| 50a14534 EB |
30 | |
| 31 | #include "googlemaps.h" | |
| 32 | ||
| cdcaf41c QT |
33 | /* initialisation */ |
| 34 | void googlemaps_init () { | |
| 35 | VikMapsLayer_MapType map_type = { 9, 128, 128, VIK_VIEWPORT_DRAWMODE_GOOGLE, googlemaps_coord_to_mapcoord, googlemaps_mapcoord_to_center_coord, googlemaps_download }; | |
| 36 | maps_layer_register_type("Old Google Maps", 9, &map_type); | |
| 37 | } | |
| 38 | ||
| 50a14534 EB |
39 | /* 1 << (x-1) is like a 2**(x-1) */ |
| 40 | #define GZ(x) ((1<<(x-1))*GOOGLEMAPS_ZOOM_ONE_MPP) | |
| 41 | ||
| 42 | static const gdouble scale_mpps[] = { GZ(1)/2, GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9), | |
| 43 | GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15) }; | |
| 44 | ||
| 45 | static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])) - 1; | |
| 46 | ||
| 47 | #define ERROR_MARGIN 0.01 | |
| 48 | guint8 googlemaps_zoom ( gdouble mpp ) { | |
| 49 | gint i; | |
| 50 | for ( i = 0; i <= num_scales; i++ ) { | |
| 51 | if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) | |
| 52 | return i; | |
| 53 | } | |
| 54 | return 255; | |
| 55 | } | |
| 56 | ||
| 57 | gboolean googlemaps_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest ) | |
| 58 | { | |
| 59 | g_assert ( src->mode == VIK_COORD_LATLON ); | |
| 60 | ||
| 61 | if ( xzoom != yzoom ) | |
| 62 | return FALSE; | |
| 63 | ||
| 64 | dest->scale = googlemaps_zoom ( xzoom ); | |
| 65 | if ( dest->scale == 255 ) | |
| 66 | return FALSE; | |
| 67 | ||
| 68 | dest->x = (gint) floor ( floor ((src->east_west + 98.35) * (131072 >> dest->scale) * 0.77162458338772) / 128); | |
| 69 | dest->y = (gint) floor ( floor ((39.5 - src->north_south) * (131072 >> dest->scale)) / 128); | |
| 70 | dest->z = 0; | |
| 71 | return TRUE; | |
| 72 | } | |
| 73 | ||
| 74 | void googlemaps_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest ) | |
| 75 | { | |
| 76 | dest->mode = VIK_COORD_LATLON; | |
| 77 | dest->north_south = 39.5 - (1.0/(131072 >> src->scale) * (src->y+0.5) * 128); | |
| 78 | dest->east_west = 1.0 / (131072 >> src->scale) * (src->x+0.5) / 0.77162458338772 * 128 - 98.35; | |
| 79 | } | |
| 80 | ||
| 81 | void googlemaps_download ( MapCoord *src, const gchar *dest_fn ) | |
| 82 | { | |
| 6c02911c | 83 | gchar *uri = g_strdup_printf ( "/mt?&x=%d&y=%d&zoom=%d", src->x, src->y, src->scale ); |
| 50a14534 EB |
84 | a_http_download_get_url ( "mt.google.com", uri, dest_fn ); |
| 85 | g_free ( uri ); | |
| 86 | } |