2 * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
4 * Copyright (C) 2005, Evan Battaglia <viking@greentorch.org>
6 * Some formulas or perhaps even code derived from GPSDrive
7 * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 #include <glib/gi18n.h>
36 #include "vikmapslayer.h"
40 static gboolean expedia_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
41 static void expedia_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest );
42 static int expedia_download ( MapCoord *src, const gchar *dest_fn );
44 static DownloadOptions expedia_options = { NULL, 2, a_check_map_file };
47 VikMapsLayer_MapType map_type = { 5, 0, 0, VIK_VIEWPORT_DRAWMODE_EXPEDIA, expedia_coord_to_mapcoord, expedia_mapcoord_to_center_coord, expedia_download };
48 maps_layer_register_type(_("Expedia Street Maps"), 5, &map_type);
51 #define EXPEDIA_SITE "expedia.com"
52 #define MPP_MARGIN_OF_ERROR 0.01
53 #define DEGREES_TO_RADS 0.0174532925
54 #define HEIGHT_OF_LAT_DEGREE (111318.84502/ALTI_TO_MPP)
55 #define HEIGHT_OF_LAT_MINUTE (1855.3140837/ALTI_TO_MPP)
56 #define WIDTH_BUFFER 0
57 #define HEIGHT_BUFFER 25
58 #define REAL_WIDTH_BUFFER 1
59 #define REAL_HEIGHT_BUFFER 26
61 /* first buffer is to cut off the expedia/microsoft logo. Annoying little buggers ;) */
62 /* second is to allow for a 1-pixel overlap on each side. this is a good thing (tm) */
64 static const guint expedia_altis[] = { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 };
65 /* square this number to find out how many per square degree. */
66 static const gdouble expedia_altis_degree_freq[] = { 120, 60, 30, 15, 8, 4, 2, 1, 1, 1 };
67 static const guint expedia_altis_count = sizeof(expedia_altis) / sizeof(expedia_altis[0]);
69 gdouble expedia_altis_freq ( gint alti )
72 for ( i = 0; i < expedia_altis_count; i++ )
73 if ( expedia_altis[i] == alti )
74 return expedia_altis_degree_freq [ i ];
76 g_error ( _("Invalid expedia altitude") );
80 /* returns -1 if none of the above. */
81 gint expedia_zoom_to_alti ( gdouble zoom )
84 for ( i = 0; i < expedia_altis_count; i++ )
85 if ( fabs(expedia_altis[i] - zoom) / zoom < MPP_MARGIN_OF_ERROR )
86 return expedia_altis[i];
91 gint expedia_pseudo_zone ( gint alti, gint x, gint y )
93 return (int) (x/expedia_altis_freq(alti)*180) + (int) (y/expedia_altis_freq(alti)*90);
97 void expedia_snip ( const gchar *file )
101 GdkPixbuf *old, *cropped;
104 old = gdk_pixbuf_new_from_file ( file, &gx );
107 g_warning ( _("Couldn't open EXPEDIA image file (right after successful download! Please report and delete image file!): %s"), gx->message );
112 width = gdk_pixbuf_get_width ( old );
113 height = gdk_pixbuf_get_height ( old );
115 cropped = gdk_pixbuf_new_subpixbuf ( old, WIDTH_BUFFER, HEIGHT_BUFFER,
116 width - 2*WIDTH_BUFFER, height - 2*HEIGHT_BUFFER );
118 gdk_pixbuf_save ( cropped, file, "png", &gx, NULL );
120 g_warning ( _("Couldn't save EXPEDIA image file (right after successful download! Please report and delete image file!): %s"), gx->message );
124 g_object_unref ( cropped );
125 g_object_unref ( old );
128 /* if degree_freeq = 60 -> nearest minute (in middle) */
129 /* everything starts at -90,-180 -> 0,0. then increments by (1/degree_freq) */
130 static gboolean expedia_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
134 g_assert ( src->mode == VIK_COORD_LATLON );
136 if ( xzoom != yzoom )
139 alti = expedia_zoom_to_alti ( xzoom );
143 dest->x = (int) (((src->east_west+180) * expedia_altis_freq(alti))+0.5);
144 dest->y = (int) (((src->north_south+90) * expedia_altis_freq(alti))+0.5);
145 /* + 0.5 to round off and not floor */
147 /* just to space out tiles on the filesystem */
154 void expedia_xy_to_latlon_middle ( gint alti, gint x, gint y, struct LatLon *ll )
156 ll->lon = (((gdouble)x) / expedia_altis_freq(alti)) - 180;
157 ll->lat = (((gdouble)y) / expedia_altis_freq(alti)) - 90;
160 static void expedia_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest )
162 dest->mode = VIK_COORD_LATLON;
163 dest->east_west = (((gdouble)src->x) / expedia_altis_freq(src->scale)) - 180;
164 dest->north_south = (((gdouble)src->y) / expedia_altis_freq(src->scale)) - 90;
167 static int expedia_download ( MapCoord *src, const gchar *dest_fn )
174 expedia_xy_to_latlon_middle ( src->scale, src->x, src->y, &ll );
176 height = HEIGHT_OF_LAT_DEGREE / expedia_altis_freq(src->scale) / (src->scale);
177 width = height * cos ( ll.lat * DEGREES_TO_RADS );
179 height += 2*REAL_HEIGHT_BUFFER;
180 width += 2*REAL_WIDTH_BUFFER;
182 uri = g_strdup_printf ( "/pub/agent.dll?qscr=mrdt&ID=3XNsF.&CenP=%lf,%lf&Lang=%s&Alti=%d&Size=%d,%d&Offs=0.000000,0.000000&BCheck&tpid=1",
183 ll.lat, ll.lon, (ll.lon > -30) ? "EUR0809" : "USA0409", src->scale, width, height );
185 if ((res = a_http_download_get_url ( EXPEDIA_SITE, uri, dest_fn, &expedia_options )) == 0) /* All OK */
186 expedia_snip ( dest_fn );