src/terraservermapsource.c

   1 /* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
   2 /*
   3  * viking
   4  * Copyright (C) Guilhem Bonnefille 2009 <guilhem.bonnefille@gmail.com>
   5  *
   6  * viking is free software: you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the
   8  * Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * viking is distributed in the hope that it will be useful, but
  12  * WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  14  * See the GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 #ifdef HAVE_CONFIG_H
  20 #include "config.h"
  21 #endif
  22
  23 #ifdef HAVE_MATH_H
  24 #include <math.h>
  25 #endif
  26
  27 #include "globals.h"
  28 #include "terraservermapsource.h"
  29
  30 static gboolean _coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
  31 static void _mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest );
  32 static int _download ( VikMapSource *self, MapCoord *src, const gchar *dest_fn );
  33
  34 /* FIXME Huge gruik */
  35 static DownloadOptions terraserver_options = { NULL, 0, a_check_map_file };
  36
  37 typedef struct _TerraserverMapSourcePrivate TerraserverMapSourcePrivate;
  38 struct _TerraserverMapSourcePrivate
  39 {
  40   int type;
  41 };
  42
  43 #define TERRASERVER_MAP_SOURCE_PRIVATE(o)  (G_TYPE_INSTANCE_GET_PRIVATE ((o), TERRASERVER_TYPE_MAP_SOURCE, TerraserverMapSourcePrivate))
  44
  45 G_DEFINE_TYPE_EXTENDED (TerraserverMapSource, terraserver_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT, (GTypeFlags)0,);
  46
  47 static void
  48 terraserver_map_source_init (TerraserverMapSource *self)
  49 {
  50         /* initialize the object here */
  51         g_object_set (G_OBJECT (self),
  52                       "tilesize-x", 200,
  53                       "tilesize-y", 200,
  54                       "drawmode", VIK_VIEWPORT_DRAWMODE_UTM,
  55                       NULL);
  56 }
  57
  58 static void
  59 terraserver_map_source_finalize (GObject *object)
  60 {
  61         /* TODO: Add deinitalization code here */
  62
  63         G_OBJECT_CLASS (terraserver_map_source_parent_class)->finalize (object);
  64 }
  65
  66 static void
  67 terraserver_map_source_class_init (TerraserverMapSourceClass *klass)
  68 {
  69         GObjectClass* object_class = G_OBJECT_CLASS (klass);
  70         VikMapSourceClass* parent_class = VIK_MAP_SOURCE_CLASS (klass);
  71
  72         /* Overiding methods */
  73         parent_class->coord_to_mapcoord =        _coord_to_mapcoord;
  74         parent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
  75         parent_class->download =                 _download;
  76
  77         g_type_class_add_private (klass, sizeof (TerraserverMapSourcePrivate));
  78
  79         object_class->finalize = terraserver_map_source_finalize;
  80 }
  81
  82 #define TERRASERVER_SITE "terraserver-usa.com"
  83 #define MARGIN_OF_ERROR 0.001
  84
  85 static int mpp_to_scale ( gdouble mpp, guint8 type )
  86 {
  87   mpp *= 4;
  88   gint t = (gint) mpp;
  89   if ( ABS(mpp - t) > MARGIN_OF_ERROR )
  90     return FALSE;
  91
  92   switch ( t ) {
  93     case 1: return (type == 4) ? 8 : 0;
  94     case 2: return (type == 4) ? 9 : 0;
  95     case 4: return (type != 2) ? 10 : 0;
  96     case 8: return 11;
  97     case 16: return 12;
  98     case 32: return 13;
  99     case 64: return 14;
 100     case 128: return 15;
 101     case 256: return 16;
 102     case 512: return 17;
 103     case 1024: return 18;
 104     case 2048: return 19;
 105     default: return 0;
 106   }
 107 }
 108
 109 static gdouble scale_to_mpp ( gint scale )
 110 {
 111   return pow(2,scale - 10);
 112 }
 113
 114 static gboolean
 115 _coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xmpp, gdouble ympp, MapCoord *dest )
 116 {
 117         g_return_val_if_fail(TERRASERVER_IS_MAP_SOURCE(self), FALSE);
 118
 119         TerraserverMapSourcePrivate *priv = TERRASERVER_MAP_SOURCE_PRIVATE(self);
 120         int type = priv->type;
 121         g_assert ( src->mode == VIK_COORD_UTM );
 122
 123         if ( xmpp != ympp )
 124                 return FALSE;
 125
 126         dest->scale = mpp_to_scale ( xmpp, type );
 127         if ( ! dest->scale )
 128                 return FALSE;
 129
 130         dest->x = (gint)(((gint)(src->east_west))/(200*xmpp));
 131         dest->y = (gint)(((gint)(src->north_south))/(200*xmpp));
 132         dest->z = src->utm_zone;
 133         return TRUE;
 134 }
 135
 136 static void
 137 _mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest )
 138 {
 139         // FIXME: slowdown here!
 140         gdouble mpp = scale_to_mpp ( src->scale );
 141         dest->mode = VIK_COORD_UTM;
 142         dest->utm_zone = src->z;
 143         dest->east_west = ((src->x * 200) + 100) * mpp;
 144         dest->north_south = ((src->y * 200) + 100) * mpp;
 145 }
 146
 147 static int
 148 _download ( VikMapSource *self, MapCoord *src, const gchar *dest_fn )
 149 {
 150         g_return_val_if_fail(TERRASERVER_IS_MAP_SOURCE(self), FALSE);
 151
 152         TerraserverMapSourcePrivate *priv = TERRASERVER_MAP_SOURCE_PRIVATE(self);  int res = -1;
 153         int type = priv->type;
 154         gchar *uri = g_strdup_printf ( "/tile.ashx?T=%d&S=%d&X=%d&Y=%d&Z=%d", type,
 155                                   src->scale, src->x, src->y, src->z );
 156         res = a_http_download_get_url ( TERRASERVER_SITE, uri, dest_fn, &terraserver_options );
 157         g_free ( uri );
 158         return res;
 159 }
 160
 161 TerraserverMapSource *
 162 terraserver_map_source_new_with_id (guint8 id, int type)
 163 {
 164         TerraserverMapSource *ret = g_object_new(TERRASERVER_TYPE_MAP_SOURCE, "id", id, NULL);
 165
 166         TerraserverMapSourcePrivate *priv = TERRASERVER_MAP_SOURCE_PRIVATE(ret);
 167         priv->type = type;
 168         return ret;
 169 }