Pileus Git - grits/blob - src/data/gis-wms.c

   1 /*
   2  * Copyright (C) 2009-2010 Andy Spencer <andy753421@gmail.com>
   3  *
   4  * This program is free software: you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 3 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 /**
  19  * Metacarte
  20  * ---------
  21  * http://labs.metacarta.com/wms/vmap0?
  22  * LAYERS=basic&
  23  * SERVICE=WMS&
  24  * VERSION=1.1.1&
  25  * REQUEST=GetMap&
  26  * STYLES=&
  27  * EXCEPTIONS=application/vnd.ogc.se_inimage&
  28  * FORMAT=image/jpeg&
  29  * SRS=EPSG:4326&
  30  * BBOX=0,-90,180,90&
  31  * WIDTH=256&
  32  * HEIGHT=256
  33  */
  34
  35 /**
  36  * http://www.nasa.network.com/elev?
  37  * SERVICE=WMS&
  38  * VERSION=1.1.0&
  39  * REQUEST=GetMap&
  40  * LAYERS=bmng200406&
  41  * STYLES=&
  42  * SRS=EPSG:4326&
  43  * BBOX=-180,-90,180,90&
  44  * FORMAT=image/jpeg&
  45  * WIDTH=600&
  46  * HEIGHT=300
  47  *
  48  * http://www.nasa.network.com/elev?
  49  * SERVICE=WMS&
  50  * VERSION=1.1.0&
  51  * REQUEST=GetMap&
  52  * LAYERS=srtm30&
  53  * STYLES=&
  54  * SRS=EPSG:4326&
  55  * BBOX=-180,-90,180,90&
  56  * FORMAT=application/bil32&
  57  * WIDTH=600&
  58  * HEIGHT=300
  59  */
  60
  61 #include <config.h>
  62 #include <stdio.h>
  63 #include <glib.h>
  64
  65 #include "gis-wms.h"
  66 #include "gis-http.h"
  67
  68 static gchar *_make_uri(GisWms *wms, GisTile *tile)
  69 {
  70         return g_strdup_printf(
  71                 "%s?"
  72                 "SERVICE=WMS&"
  73                 "VERSION=1.1.0&"
  74                 "REQUEST=GetMap&"
  75                 "LAYERS=%s&"
  76                 "STYLES=&"
  77                 "SRS=EPSG:4326&"
  78                 "FORMAT=%s&"
  79                 "WIDTH=%d&"
  80                 "HEIGHT=%d&"
  81                 "BBOX=%f,%f,%f,%f",
  82                 wms->uri_prefix,
  83                 wms->uri_layer,
  84                 wms->uri_format,
  85                 wms->width,
  86                 wms->height,
  87                 tile->edge.w,
  88                 tile->edge.s,
  89                 tile->edge.e,
  90                 tile->edge.n);
  91 }
  92
  93 gchar *gis_wms_fetch(GisWms *self, GisTile *tile, GisCacheType mode,
  94                 GisChunkCallback callback, gpointer user_data)
  95 {
  96         gchar *uri   = _make_uri(self, tile);
  97         gchar *tilep = gis_tile_get_path(tile);
  98         gchar *local = g_strdup_printf("%s%s", tilep, self->extension);
  99         mode = GIS_ONCE;
 100         gchar *path  = gis_http_fetch(self->http, uri, local,
 101                         mode, callback, user_data);
 102         g_free(uri);
 103         g_free(tilep);
 104         g_free(local);
 105         return path;
 106 }
 107
 108 GisWms *gis_wms_new(
 109         const gchar *uri_prefix, const gchar *uri_layer,
 110         const gchar *uri_format, const gchar *prefix,
 111         const gchar *extension, gint width, gint height)
 112 {
 113         g_debug("GisWms: new - %s", uri_prefix);
 114         GisWms *self = g_new0(GisWms, 1);
 115         self->http         = gis_http_new(prefix);
 116         self->uri_prefix   = g_strdup(uri_prefix);
 117         self->uri_layer    = g_strdup(uri_layer);
 118         self->uri_format   = g_strdup(uri_format);
 119         self->extension    = g_strdup(extension);
 120         self->width        = width;
 121         self->height       = height;
 122         return self;
 123 }
 124
 125 void gis_wms_free(GisWms *self)
 126 {
 127         g_debug("GisWms: free - %s", self->uri_prefix);
 128         gis_http_free(self->http);
 129         g_free(self->uri_prefix);
 130         g_free(self->uri_layer);
 131         g_free(self->uri_format);
 132         g_free(self->extension);
 133         g_free(self);
 134 }