2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
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.
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.
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
30 #include "vikmapslayer.h"
34 static DownloadOptions khmaps_options = { 1, NULL };
37 VikMapsLayer_MapType map_type = { 8, 256, 256, VIK_VIEWPORT_DRAWMODE_KH, khmaps_coord_to_mapcoord, khmaps_mapcoord_to_center_coord, khmaps_download };
39 maps_layer_register_type("Old KH Satellite Images", 8, &map_type);
42 /* 1 << (x-1) is like a 2**(x-1) */
43 #define KH(x) ((1<<(x-1)))
45 static const gdouble scale_mpps[] = { KH(1), KH(2), KH(3), KH(4), KH(5), KH(6), KH(7), KH(8), KH(9),
46 KH(10), KH(11), KH(12), KH(13), KH(14), KH(15) };
48 static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0])) - 1;
50 #define ERROR_MARGIN 0.01
51 guint8 khmaps_zoom ( gdouble mpp ) {
53 for ( i = 0; i <= num_scales; i++ ) {
54 if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN )
60 gboolean khmaps_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
62 g_assert ( src->mode == VIK_COORD_LATLON );
67 dest->scale = khmaps_zoom ( xzoom );
68 if ( dest->scale == 255 )
72 dest->x = (gint) ((1<<(16 - dest->scale)) + (src->east_west / 180 * (1<<(16-dest->scale))));
73 dest->y = (gint) ((1<<(16 - dest->scale)) - (src->north_south / 180 * (1<<(16-dest->scale))));
78 void khmaps_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest )
80 dest->mode = VIK_COORD_LATLON;
81 dest->east_west = (src->x+0.5 - (1<<(16 - src->scale))) * 180 / (1<<(16-src->scale));
82 dest->north_south = -((src->y+0.5 - (1<<(16 - src->scale))) * 180 / (1<<(16-src->scale)));
85 static char *kh_encode(guint32 x, guint32 y, guint8 scale)
87 gchar *buf = g_malloc ( (20-scale)*sizeof(gchar) );
88 guint32 ya = 1 << (17 - scale);
91 if (y < 0 || (ya-1 < y)) {
92 strcpy(buf,"tqq"); /* BAD */
95 if (x < 0 || ya-1 < x) {
102 for (j = 1, i = 16; i >= scale; i--, j++) {
126 void khmaps_download ( MapCoord *src, const gchar *dest_fn )
128 gchar *tmp = kh_encode(src->x, src->y, src->scale);
129 gchar *uri = g_strdup_printf ( "/kh?v=2&t=%s", tmp );
130 g_print("%d %d %d = %s\n", src->x, src->y, src->scale, uri);
132 a_http_download_get_url ( "kh.google.com", uri, dest_fn, &khmaps_options );
136 /* Popularity has its disadvantages ... */