src/expedia.c

   1 /*
   2  * viking -- GPS Data and Topo Analyzer, Explorer, and Manager
   3  *
   4  * Copyright (C) 2005, Evan Battaglia <viking@greentorch.org>
   5  *
   6  * Some formulas or perhaps even code derived from GPSDrive
   7  * GPSDrive Copyright (C) 2001-2004 Fritz Ganter <ganter@ganter.at>
   8  *
   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.
  13  *
  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.
  18  *
  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
  22  *
  23  */
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <glib/gi18n.h>
  29 #include <gtk/gtk.h>
  30 #ifdef HAVE_MATH_H
  31 #include <math.h>
  32 #endif
  33
  34 #include "globals.h"
  35 #include "coords.h"
  36 #include "vikcoord.h"
  37 #include "mapcoord.h"
  38 #include "download.h"
  39 #include "vikmapslayer.h"
  40
  41 #include "expedia.h"
  42
  43 static gboolean expedia_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
  44 static void expedia_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest );
  45 static int expedia_download ( MapCoord *src, const gchar *dest_fn );
  46
  47 static DownloadOptions expedia_options = { NULL, 2, a_check_map_file };
  48
  49 void expedia_init() {
  50   VikMapsLayer_MapType map_type = { 5, 0, 0, VIK_VIEWPORT_DRAWMODE_EXPEDIA, expedia_coord_to_mapcoord, expedia_mapcoord_to_center_coord, expedia_download };
  51   maps_layer_register_type(_("Expedia Street Maps"), 5, &map_type);
  52 }
  53
  54 #define EXPEDIA_SITE "expedia.com"
  55 #define MPP_MARGIN_OF_ERROR 0.01
  56 #define DEGREES_TO_RADS 0.0174532925
  57 #define HEIGHT_OF_LAT_DEGREE (111318.84502/ALTI_TO_MPP)
  58 #define HEIGHT_OF_LAT_MINUTE (1855.3140837/ALTI_TO_MPP)
  59 #define WIDTH_BUFFER 0
  60 #define HEIGHT_BUFFER 25
  61 #define REAL_WIDTH_BUFFER 1
  62 #define REAL_HEIGHT_BUFFER 26
  63
  64 /* first buffer is to cut off the expedia/microsoft logo. Annoying little buggers ;) */
  65 /* second is to allow for a 1-pixel overlap on each side. this is a good thing (tm) */
  66
  67 static const guint expedia_altis[]              = { 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 };
  68 /* square this number to find out how many per square degree. */
  69 static const gdouble expedia_altis_degree_freq[]  = { 120, 60, 30, 15, 8, 4, 2, 1, 1, 1 };
  70 static const guint expedia_altis_count = sizeof(expedia_altis) / sizeof(expedia_altis[0]);
  71
  72 gdouble expedia_altis_freq ( gint alti )
  73 {
  74   static gint i;
  75   for ( i = 0; i < expedia_altis_count; i++ )
  76     if ( expedia_altis[i] == alti )
  77       return expedia_altis_degree_freq [ i ];
  78
  79   g_error ( _("Invalid expedia altitude") );
  80   return 0;
  81 }
  82
  83 /* returns -1 if none of the above. */
  84 gint expedia_zoom_to_alti ( gdouble zoom )
  85 {
  86   guint i;
  87   for ( i = 0; i < expedia_altis_count; i++ )
  88     if ( fabs(expedia_altis[i] - zoom) / zoom < MPP_MARGIN_OF_ERROR )
  89       return expedia_altis[i];
  90   return -1;
  91 }
  92
  93 /*
  94 gint expedia_pseudo_zone ( gint alti, gint x, gint y )
  95 {
  96   return (int) (x/expedia_altis_freq(alti)*180) + (int) (y/expedia_altis_freq(alti)*90);
  97 }
  98 */
  99
 100 void expedia_snip ( const gchar *file )
 101 {
 102   /* Load the pixbuf */
 103   GError *gx = NULL;
 104   GdkPixbuf *old, *cropped;
 105   gint width, height;
 106
 107   old = gdk_pixbuf_new_from_file ( file, &gx );
 108   if (gx)
 109   {
 110     g_warning ( _("Couldn't open EXPEDIA image file (right after successful download! Please report and delete image file!): %s"), gx->message );
 111     g_error_free ( gx );
 112     return;
 113   }
 114
 115   width = gdk_pixbuf_get_width ( old );
 116   height = gdk_pixbuf_get_height ( old );
 117
 118   cropped = gdk_pixbuf_new_subpixbuf ( old, WIDTH_BUFFER, HEIGHT_BUFFER,
 119                               width - 2*WIDTH_BUFFER, height - 2*HEIGHT_BUFFER );
 120
 121   gdk_pixbuf_save ( cropped, file, "png", &gx, NULL );
 122   if ( gx ) {
 123     g_warning ( _("Couldn't save EXPEDIA image file (right after successful download! Please report and delete image file!): %s"), gx->message );
 124     g_error_free ( gx );
 125   }
 126
 127   g_object_unref ( cropped );
 128   g_object_unref ( old );
 129 }
 130
 131 /* if degree_freeq = 60 -> nearest minute (in middle) */
 132 /* everything starts at -90,-180 -> 0,0. then increments by (1/degree_freq) */
 133 static gboolean expedia_coord_to_mapcoord ( const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
 134 {
 135   gint alti;
 136
 137   g_assert ( src->mode == VIK_COORD_LATLON );
 138
 139   if ( xzoom != yzoom )
 140     return FALSE;
 141
 142   alti = expedia_zoom_to_alti ( xzoom );
 143   if ( alti != -1 )
 144   {
 145     dest->scale = alti;
 146     dest->x = (int) (((src->east_west+180) * expedia_altis_freq(alti))+0.5);
 147     dest->y = (int) (((src->north_south+90) * expedia_altis_freq(alti))+0.5);
 148     /* + 0.5 to round off and not floor */
 149
 150     /* just to space out tiles on the filesystem */
 151     dest->z = 0;
 152     return TRUE;
 153   }
 154   return FALSE;
 155 }
 156
 157 void expedia_xy_to_latlon_middle ( gint alti, gint x, gint y, struct LatLon *ll )
 158 {
 159   ll->lon = (((gdouble)x) / expedia_altis_freq(alti)) - 180;
 160   ll->lat = (((gdouble)y) / expedia_altis_freq(alti)) - 90;
 161 }
 162
 163 static void expedia_mapcoord_to_center_coord ( MapCoord *src, VikCoord *dest )
 164 {
 165   dest->mode = VIK_COORD_LATLON;
 166   dest->east_west = (((gdouble)src->x) / expedia_altis_freq(src->scale)) - 180;
 167   dest->north_south = (((gdouble)src->y) / expedia_altis_freq(src->scale)) - 90;
 168 }
 169
 170 static int expedia_download ( MapCoord *src, const gchar *dest_fn )
 171 {
 172   gint height, width;
 173   struct LatLon ll;
 174   gchar *uri;
 175   int res = -1;
 176
 177   expedia_xy_to_latlon_middle ( src->scale, src->x, src->y, &ll );
 178
 179   height = HEIGHT_OF_LAT_DEGREE / expedia_altis_freq(src->scale) / (src->scale);
 180   width = height * cos ( ll.lat * DEGREES_TO_RADS );
 181
 182   height += 2*REAL_HEIGHT_BUFFER;
 183   width  += 2*REAL_WIDTH_BUFFER;
 184
 185   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",
 186                ll.lat, ll.lon, (ll.lon > -30) ? "EUR0809" : "USA0409", src->scale, width, height );
 187
 188   if ((res = a_http_download_get_url ( EXPEDIA_SITE, uri, dest_fn, &expedia_options )) == 0)    /* All OK */
 189         expedia_snip ( dest_fn );
 190   g_free(uri);
 191   return(res);
 192 }
 193