+/*
+ * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
+ *
+ * Copyright (C) 2003-2005, Evan Battaglia <gtoevan@gmx.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <gtk/gtk.h>
+#include <math.h>
+#include "viking.h"
+#include "coords.h"
+#include "vikcoord.h"
+#include "mapcoord.h"
+#include "http.h"
+#include "vikmapslayer.h"
+
+#include "osm.h"
+
+/* initialisation */
+void osm_init () {
+ VikMapsLayer_MapType osmarender_type = { 12, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, osm_coord_to_mapcoord, osm_mapcoord_to_center_coord, osm_osmarender_download };
+ VikMapsLayer_MapType mapnik_type = { 13, 256, 256, VIK_VIEWPORT_DRAWMODE_MERCATOR, osm_coord_to_mapcoord, osm_mapcoord_to_center_coord, osm_mapnik_download };
+ maps_layer_register_type("OpenStreetMap (Osmarender)", 12, &osmarender_type);
+ maps_layer_register_type("OpenStreetMap (Mapnik)", 13, &mapnik_type);
+}
+
+/* 1 << (x) is like a 2**(x) */
+#define GZ(x) (1<<(x))
+
+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),
+ GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };
+
+static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));
+
+#define ERROR_MARGIN 0.01
+guint8 osm_zoom ( gdouble mpp ) {
+ gint i;
+ for ( i = 0; i < num_scales; i++ ) {
+ if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN )
+ return i;
+ }
+ return 255;
+}
+
+gboolean osm_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
+{
+ g_assert ( src->mode == VIK_COORD_LATLON );
+
+ if ( xzoom != yzoom )
+ return FALSE;
+
+ dest->scale = osm_zoom ( xzoom );
+ if ( dest->scale == 255 )
+ return FALSE;
+
+ dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
+ dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
+ dest->z = 0;
+ return TRUE;
+}
+
+void osm_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest )
+{
+ gdouble socalled_mpp = GZ(src->scale);
+ dest->mode = VIK_COORD_LATLON;
+ dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
+ dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
+}
+
+void osm_mapnik_download ( MapCoord *src, const gchar *dest_fn )
+{
+ gchar *uri = g_strdup_printf ( "/osamrender/%d/%d/%d.png", 17-src->scale, src->x, src->y );
+ a_http_download_get_url ( "tile.openstreetmap.org", uri, dest_fn );
+ g_free ( uri );
+}
+
+void osm_osmarender_download ( MapCoord *src, const gchar *dest_fn )
+{
+ gchar *uri = g_strdup_printf ( "/~ojw/Tiles/tile.php/%d/%d/%d.png", 17-src->scale, src->x, src->y );
+ a_http_download_get_url ( "dev.openstreetmap.org", uri, dest_fn );
+ g_free ( uri );
+}
projects / andy / viking.git / commitdiff