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