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
29 #include "vikmapslayer.h"
35 VikMapsLayer_MapType osmarender_type
= { 12, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR
, osm_coord_to_mapcoord
, osm_mapcoord_to_center_coord
, osm_osmarender_download
};
36 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
};
38 maps_layer_register_type("OpenStreetMap (Osmarender)", 12, &osmarender_type
);
39 maps_layer_register_type("OpenStreetMap (Mapnik)", 13, &mapnik_type
);
40 maps_layer_register_type("OpenStreetMap (Maplint)", 14, &maplint_type
);
43 /* 1 << (x) is like a 2**(x) */
44 #define GZ(x) (1<<(x))
46 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),
47 GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };
49 static const gint num_scales
= (sizeof(scale_mpps
) / sizeof(scale_mpps
[0]));
51 #define ERROR_MARGIN 0.01
52 guint8
osm_zoom ( gdouble mpp
) {
54 for ( i
= 0; i
< num_scales
; i
++ ) {
55 if ( ABS(scale_mpps
[i
] - mpp
) < ERROR_MARGIN
)
61 gboolean
osm_coord_to_mapcoord ( const VikCoord
*src
, gdouble xzoom
, gdouble yzoom
, MapCoord
*dest
)
63 g_assert ( src
->mode
== VIK_COORD_LATLON
);
68 dest
->scale
= osm_zoom ( xzoom
);
69 if ( dest
->scale
== 255 )
72 dest
->x
= (src
->east_west
+ 180) / 360 * GZ(17) / xzoom
;
73 dest
->y
= (180 - MERCLAT(src
->north_south
)) / 360 * GZ(17) / xzoom
;
78 void osm_mapcoord_to_center_coord ( MapCoord
*src
, VikCoord
*dest
)
80 gdouble socalled_mpp
= GZ(src
->scale
);
81 dest
->mode
= VIK_COORD_LATLON
;
82 dest
->east_west
= ((src
->x
+0.5) / GZ(17) * socalled_mpp
* 360) - 180;
83 dest
->north_south
= DEMERCLAT(180 - ((src
->y
+0.5) / GZ(17) * socalled_mpp
* 360));
87 * Ex: http://dev.openstreetmap.org/~ojw/Tiles/maplint.php/10/517/375.png
89 void osm_maplint_download ( MapCoord
*src
, const gchar
*dest_fn
)
91 gchar
*uri
= g_strdup_printf ( "/~ojw/Tiles/maplint.php/%d/%d/%d.png", 17-src
->scale
, src
->x
, src
->y
);
92 a_http_download_get_url ( "dev.openstreetmap.org", uri
, dest_fn
);
96 void osm_mapnik_download ( MapCoord
*src
, const gchar
*dest_fn
)
98 gchar
*uri
= g_strdup_printf ( "/osamrender/%d/%d/%d.png", 17-src
->scale
, src
->x
, src
->y
);
99 a_http_download_get_url ( "tile.openstreetmap.org", uri
, dest_fn
);
103 void osm_osmarender_download ( MapCoord
*src
, const gchar
*dest_fn
)
105 gchar
*uri
= g_strdup_printf ( "/~ojw/Tiles/tile.php/%d/%d/%d.png", 17-src
->scale
, src
->x
, src
->y
);
106 a_http_download_get_url ( "dev.openstreetmap.org", uri
, dest_fn
);