[andy/viking.git] / src / viktmsmapsource.c

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
 * viking
 * Copyright (C) 2010, Guilhem Bonnefille <guilhem.bonnefille@gmail.com>
 * 
 * viking is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 * 
 * viking is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License along
 * with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

 /**
  * SECTION:viktmsmapsource
  * @short_description: the class for TMS oriented map sources
  * 
  * The #VikTmsMapSource class handles TMS oriented map sources.
  * 
  * The tiles are in 'equirectangular'.
  * http://en.wikipedia.org/wiki/Equirectangular_projection
  * 
  * Such service is also a type of TMS (Tile Map Service) as defined in
  * OSGeo's wiki.
  * http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification
  * Following this specification, the protocol handled by this class
  * follows the global-geodetic profile.
  */
  
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_MATH_H
#include <math.h>
#endif

#include "globals.h"
#include "viktmsmapsource.h"
#include "maputils.h"

static gboolean _coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
static void _mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest );
static gboolean _supports_download_only_new ( VikMapSource *self );
static gboolean _is_direct_file_access ( VikMapSource *self );

static gchar *_get_uri( VikMapSourceDefault *self, MapCoord *src );
static gchar *_get_hostname( VikMapSourceDefault *self );
static DownloadMapOptions *_get_download_options( VikMapSourceDefault *self );

typedef struct _VikTmsMapSourcePrivate VikTmsMapSourcePrivate;
struct _VikTmsMapSourcePrivate
{
  gchar *hostname;
  gchar *url;
  DownloadMapOptions options;
};

#define VIK_TMS_MAP_SOURCE_PRIVATE(o)  (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_TMS_MAP_SOURCE, VikTmsMapSourcePrivate))

/* properties */
enum
{
  PROP_0,

  PROP_HOSTNAME,
  PROP_URL,
  PROP_REFERER,
  PROP_FOLLOW_LOCATION,
  PROP_CHECK_FILE_SERVER_TIME,
};

G_DEFINE_TYPE (VikTmsMapSource, vik_tms_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT);

static void
vik_tms_map_source_init (VikTmsMapSource *self)
{
  /* initialize the object here */
  VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);

  priv->hostname = NULL;
  priv->url = NULL;
  priv->options.referer = NULL;
  priv->options.follow_location = 0;
  priv->options.check_file = a_check_map_file;
  priv->options.check_file_server_time = FALSE;

  g_object_set (G_OBJECT (self),
                "tilesize-x", 256,
                "tilesize-y", 256,
                "drawmode", VIK_VIEWPORT_DRAWMODE_LATLON,
                NULL);
}

static void
vik_tms_map_source_finalize (GObject *object)
{
  VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object);
  VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);

  g_free (priv->hostname);
  priv->hostname = NULL;
  g_free (priv->url);
  priv->url = NULL;
  g_free (priv->options.referer);
  priv->options.referer = NULL;

  G_OBJECT_CLASS (vik_tms_map_source_parent_class)->finalize (object);
}

static void
vik_tms_map_source_set_property (GObject      *object,
                                    guint         property_id,
                                    const GValue *value,
                                    GParamSpec   *pspec)
{
  VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object);
  VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);

  switch (property_id)
    {
    case PROP_HOSTNAME:
      g_free (priv->hostname);
      priv->hostname = g_value_dup_string (value);
      break;

    case PROP_URL:
      g_free (priv->url);
      priv->url = g_value_dup_string (value);
      break;

    case PROP_REFERER:
      g_free (priv->options.referer);
      priv->options.referer = g_value_dup_string (value);
      break;

    case PROP_FOLLOW_LOCATION:
      priv->options.follow_location = g_value_get_long (value);
      break;

    case PROP_CHECK_FILE_SERVER_TIME:
      priv->options.check_file_server_time = g_value_get_boolean (value);
      break;

    default:
      /* We don't have any other property... */
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
vik_tms_map_source_get_property (GObject    *object,
                                    guint       property_id,
                                    GValue     *value,
                                    GParamSpec *pspec)
{
  VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object);
  VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);

  switch (property_id)
    {
    case PROP_HOSTNAME:
      g_value_set_string (value, priv->hostname);
      break;

    case PROP_URL:
      g_value_set_string (value, priv->url);
      break;

    case PROP_REFERER:
      g_value_set_string (value, priv->options.referer);
      break;

    case PROP_FOLLOW_LOCATION:
      g_value_set_long (value, priv->options.follow_location);
      break;

    case PROP_CHECK_FILE_SERVER_TIME:
      g_value_set_boolean (value, priv->options.check_file_server_time);
      break;
	  
    default:
      /* We don't have any other property... */
      G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
      break;
    }
}

static void
vik_tms_map_source_class_init (VikTmsMapSourceClass *klass)
{
	GObjectClass* object_class = G_OBJECT_CLASS (klass);
	VikMapSourceClass* grandparent_class = VIK_MAP_SOURCE_CLASS (klass);
	VikMapSourceDefaultClass* parent_class = VIK_MAP_SOURCE_DEFAULT_CLASS (klass);
	GParamSpec *pspec = NULL;
		
	object_class->set_property = vik_tms_map_source_set_property;
    object_class->get_property = vik_tms_map_source_get_property;

	/* Overiding methods */
	grandparent_class->coord_to_mapcoord =        _coord_to_mapcoord;
	grandparent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
	grandparent_class->supports_download_only_new = _supports_download_only_new;
	grandparent_class->is_direct_file_access = _is_direct_file_access;
	
	parent_class->get_uri = _get_uri;
	parent_class->get_hostname = _get_hostname;
	parent_class->get_download_options = _get_download_options;

	pspec = g_param_spec_string ("hostname",
	                             "Hostname",
	                             "The hostname of the map server",
	                             "<no-set>" /* default value */,
	                             G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_HOSTNAME, pspec);

	pspec = g_param_spec_string ("url",
	                             "URL",
	                             "The template of the tiles' URL",
	                             "<no-set>" /* default value */,
	                             G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_URL, pspec);

	pspec = g_param_spec_string ("referer",
	                             "Referer",
	                             "The REFERER string to use in HTTP request",
	                             NULL /* default value */,
	                             G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_REFERER, pspec);
	
	pspec = g_param_spec_long ("follow-location",
	                           "Follow location",
                               "Specifies the number of retries to follow a redirect while downloading a page",
                               0  /* minimum value */,
                               G_MAXLONG /* maximum value */,
                               0  /* default value */,
                               G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_FOLLOW_LOCATION, pspec);
	
	pspec = g_param_spec_boolean ("check-file-server-time",
	                              "Check file server time",
                                  "Age of current cache before redownloading tile",
                                  FALSE  /* default value */,
                                  G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_CHECK_FILE_SERVER_TIME, pspec);

	g_type_class_add_private (klass, sizeof (VikTmsMapSourcePrivate));
	
	object_class->finalize = vik_tms_map_source_finalize;
}

static gboolean
_is_direct_file_access ( VikMapSource *self )
{
	return FALSE;
}

static gboolean
_supports_download_only_new ( VikMapSource *self )
{
	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), FALSE);
	
    VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	
	return priv->options.check_file_server_time;
}

static gboolean
_coord_to_mapcoord ( VikMapSource *self, const VikCoord *src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
{
  g_assert ( src->mode == VIK_COORD_LATLON );

  if ( xzoom != yzoom )
    return FALSE;

  dest->scale = map_utils_mpp_to_scale ( xzoom );
  if ( dest->scale == 255 )
    return FALSE;

  /* Note : VIK_GZ(17) / xzoom / 2 = number of tile on Y axis */
	g_debug("%s: xzoom=%f yzoom=%f -> %f", __FUNCTION__,
          xzoom, yzoom, VIK_GZ(17) / xzoom / 2);
  dest->x = floor((src->east_west + 180) / 180 * VIK_GZ(17) / xzoom / 2);
  /* We should restore logic of viking:
   * tile index on Y axis follow a screen logic (top -> down)
   */
  dest->y = floor((180 - (src->north_south + 90)) / 180 * VIK_GZ(17) / xzoom / 2);
  dest->z = 0;
  g_debug("%s: %f,%f -> %d,%d", __FUNCTION__,
          src->east_west, src->north_south, dest->x, dest->y);
  return TRUE;
}

static void
_mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest )
{
  gdouble socalled_mpp;
  if (src->scale >= 0)
    socalled_mpp = VIK_GZ(src->scale);
  else
    socalled_mpp = 1.0/VIK_GZ(-src->scale);
  dest->mode = VIK_COORD_LATLON;
  dest->east_west = (src->x+0.5) * 180 / VIK_GZ(17) * socalled_mpp * 2 - 180;
  /* We should restore logic of viking:
   * tile index on Y axis follow a screen logic (top -> down)
   */
  dest->north_south = -((src->y+0.5) * 180 / VIK_GZ(17) * socalled_mpp * 2 - 90);
  g_debug("%s: %d,%d -> %f,%f", __FUNCTION__,
          src->x, src->y, dest->east_west, dest->north_south);
}

static gchar *
_get_uri( VikMapSourceDefault *self, MapCoord *src )
{
	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL);
	
    VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	/* We should restore logic of viking:
     * tile index on Y axis follow a screen logic (top -> down)
     */

	/* Note : nb tiles on Y axis */
	gint nb_tiles = VIK_GZ(17 - src->scale - 1);

	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale - 1, src->x, nb_tiles - src->y - 1);
	
	return uri;
} 

static gchar *
_get_hostname( VikMapSourceDefault *self )
{
	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL);
	
    VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	return g_strdup( priv->hostname );
}

static DownloadMapOptions *
_get_download_options( VikMapSourceDefault *self )
{
	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL);
	
	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	return &(priv->options);
}

VikTmsMapSource *
vik_tms_map_source_new_with_id (guint8 id, const gchar *label, const gchar *hostname, const gchar *url)
{
	return g_object_new(VIK_TYPE_TMS_MAP_SOURCE,
	                    "id", id, "label", label, "hostname", hostname, "url", url, NULL);
}
Commit	Line	Data
90f15672 GB	1	/* -- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -- */
	2	/*
	3	* viking
	4	* Copyright (C) 2010, Guilhem Bonnefille <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
98264f5e	8	* Free Software Foundation, either version 2 of the License, or
90f15672 GB	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	*/
aa69d106 GB	19
	20	/**
	21	* SECTION:viktmsmapsource
	22	* @short_description: the class for TMS oriented map sources
	23	*
	24	* The #VikTmsMapSource class handles TMS oriented map sources.
	25	*
	26	* The tiles are in 'equirectangular'.
	27	* http://en.wikipedia.org/wiki/Equirectangular_projection
	28	*
	29	* Such service is also a type of TMS (Tile Map Service) as defined in
	30	* OSGeo's wiki.
	31	* http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification
	32	* Following this specification, the protocol handled by this class
	33	* follows the global-geodetic profile.
	34	*/
90f15672 GB	35
	36	#ifdef HAVE_CONFIG_H
	37	#include "config.h"
	38	#endif
	39
	40	#ifdef HAVE_MATH_H
	41	#include <math.h>
	42	#endif
	43
	44	#include "globals.h"
	45	#include "viktmsmapsource.h"
e1dde2a6	46	#include "maputils.h"
90f15672 GB	47
	48	static gboolean _coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
	49	static void _mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest );
a748af37	50	static gboolean _supports_download_only_new ( VikMapSource *self );
a0262d5b	51	static gboolean _is_direct_file_access ( VikMapSource *self );
90f15672 GB	52
	53	static gchar _get_uri( VikMapSourceDefault self, MapCoord *src );
	54	static gchar _get_hostname( VikMapSourceDefault self );
	55	static DownloadMapOptions _get_download_options( VikMapSourceDefault self );
	56
	57	typedef struct _VikTmsMapSourcePrivate VikTmsMapSourcePrivate;
	58	struct _VikTmsMapSourcePrivate
	59	{
	60	gchar *hostname;
	61	gchar *url;
	62	DownloadMapOptions options;
	63	};
	64
	65	#define VIK_TMS_MAP_SOURCE_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_TMS_MAP_SOURCE, VikTmsMapSourcePrivate))
	66
	67	/* properties */
	68	enum
	69	{
	70	PROP_0,
	71
	72	PROP_HOSTNAME,
	73	PROP_URL,
	74	PROP_REFERER,
	75	PROP_FOLLOW_LOCATION,
	76	PROP_CHECK_FILE_SERVER_TIME,
	77	};
	78
	79	G_DEFINE_TYPE (VikTmsMapSource, vik_tms_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT);
	80
	81	static void
	82	vik_tms_map_source_init (VikTmsMapSource *self)
	83	{
	84	/* initialize the object here */
	85	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);
	86
	87	priv->hostname = NULL;
	88	priv->url = NULL;
	89	priv->options.referer = NULL;
	90	priv->options.follow_location = 0;
	91	priv->options.check_file = a_check_map_file;
	92	priv->options.check_file_server_time = FALSE;
	93
	94	g_object_set (G_OBJECT (self),
	95	"tilesize-x", 256,
	96	"tilesize-y", 256,
	97	"drawmode", VIK_VIEWPORT_DRAWMODE_LATLON,
	98	NULL);
	99	}
	100
	101	static void
	102	vik_tms_map_source_finalize (GObject *object)
	103	{
	104	VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object);
	105	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);
	106
	107	g_free (priv->hostname);
	108	priv->hostname = NULL;
	109	g_free (priv->url);
	110	priv->url = NULL;
	111	g_free (priv->options.referer);
	112	priv->options.referer = NULL;
	113
	114	G_OBJECT_CLASS (vik_tms_map_source_parent_class)->finalize (object);
	115	}
116
117	static void
118	vik_tms_map_source_set_property (GObject *object,
119	guint property_id,
120	const GValue *value,
121	GParamSpec *pspec)
122	{
123	VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object);
124	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);
125
126	switch (property_id)
127	{
128	case PROP_HOSTNAME:
129	g_free (priv->hostname);
130	priv->hostname = g_value_dup_string (value);
131	break;
132
133	case PROP_URL:
134	g_free (priv->url);
135	priv->url = g_value_dup_string (value);
136	break;
137
138	case PROP_REFERER:
139	g_free (priv->options.referer);
140	priv->options.referer = g_value_dup_string (value);
141	break;
142
143	case PROP_FOLLOW_LOCATION:
144	priv->options.follow_location = g_value_get_long (value);
145	break;
146
147	case PROP_CHECK_FILE_SERVER_TIME:
148	priv->options.check_file_server_time = g_value_get_boolean (value);
149	break;
150
151	default:
152	/* We don't have any other property... */
153	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
154	break;
155	}
156	}
157
158	static void
159	vik_tms_map_source_get_property (GObject *object,
160	guint property_id,
161	GValue *value,
162	GParamSpec *pspec)
163	{
164	VikTmsMapSource *self = VIK_TMS_MAP_SOURCE (object);
165	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE (self);
166
167	switch (property_id)
168	{
169	case PROP_HOSTNAME:
170	g_value_set_string (value, priv->hostname);
171	break;
172
173	case PROP_URL:
174	g_value_set_string (value, priv->url);
175	break;
176
177	case PROP_REFERER:
178	g_value_set_string (value, priv->options.referer);
179	break;
180
181	case PROP_FOLLOW_LOCATION:
182	g_value_set_long (value, priv->options.follow_location);
183	break;
184
185	case PROP_CHECK_FILE_SERVER_TIME:
186	g_value_set_boolean (value, priv->options.check_file_server_time);
187	break;
188
189	default:
190	/* We don't have any other property... */
191	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
192	break;
193	}
194	}
195
196	static void
197	vik_tms_map_source_class_init (VikTmsMapSourceClass *klass)
198	{
199	GObjectClass* object_class = G_OBJECT_CLASS (klass);
a3319e11	200	VikMapSourceClass* grandparent_class = VIK_MAP_SOURCE_CLASS (klass);
90f15672 GB	201	VikMapSourceDefaultClass* parent_class = VIK_MAP_SOURCE_DEFAULT_CLASS (klass);
	202	GParamSpec *pspec = NULL;
	203
	204	object_class->set_property = vik_tms_map_source_set_property;
	205	object_class->get_property = vik_tms_map_source_get_property;
	206
	207	/* Overiding methods */
a3319e11 RN	208	grandparent_class->coord_to_mapcoord = _coord_to_mapcoord;
	209	grandparent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
	210	grandparent_class->supports_download_only_new = _supports_download_only_new;
a0262d5b	211	grandparent_class->is_direct_file_access = _is_direct_file_access;
90f15672 GB	212
	213	parent_class->get_uri = _get_uri;
	214	parent_class->get_hostname = _get_hostname;
	215	parent_class->get_download_options = _get_download_options;
	216
	217	pspec = g_param_spec_string ("hostname",
	218	"Hostname",
	219	"The hostname of the map server",
	220	"<no-set>" /* default value */,
	221	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	222	g_object_class_install_property (object_class, PROP_HOSTNAME, pspec);
	223
	224	pspec = g_param_spec_string ("url",
	225	"URL",
	226	"The template of the tiles' URL",
	227	"<no-set>" /* default value */,
	228	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	229	g_object_class_install_property (object_class, PROP_URL, pspec);
	230
	231	pspec = g_param_spec_string ("referer",
	232	"Referer",
	233	"The REFERER string to use in HTTP request",
	234	NULL /* default value */,
	235	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	236	g_object_class_install_property (object_class, PROP_REFERER, pspec);
	237
	238	pspec = g_param_spec_long ("follow-location",
	239	"Follow location",
	240	"Specifies the number of retries to follow a redirect while downloading a page",
	241	0 /* minimum value */,
	242	G_MAXLONG /* maximum value */,
	243	0 /* default value */,
	244	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	245	g_object_class_install_property (object_class, PROP_FOLLOW_LOCATION, pspec);
	246
	247	pspec = g_param_spec_boolean ("check-file-server-time",
	248	"Check file server time",
	249	"Age of current cache before redownloading tile",
	250	FALSE /* default value */,
	251	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	252	g_object_class_install_property (object_class, PROP_CHECK_FILE_SERVER_TIME, pspec);
	253
	254	g_type_class_add_private (klass, sizeof (VikTmsMapSourcePrivate));
	255
	256	object_class->finalize = vik_tms_map_source_finalize;
	257	}
	258
a0262d5b RN	259	static gboolean
	260	_is_direct_file_access ( VikMapSource *self )
	261	{
	262	return FALSE;
	263	}
	264
a748af37 RN	265	static gboolean
a748af37 RN	266	_supports_download_only_new ( VikMapSource *self )
90f15672 GB	267	{
	268	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), FALSE);
	269
	270	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	271
	272	return priv->options.check_file_server_time;
	273	}
	274
	275	static gboolean
	276	_coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
	277	{
	278	g_assert ( src->mode == VIK_COORD_LATLON );
	279
	280	if ( xzoom != yzoom )
	281	return FALSE;
	282
e1dde2a6	283	dest->scale = map_utils_mpp_to_scale ( xzoom );
90f15672 GB	284	if ( dest->scale == 255 )
	285	return FALSE;
	286
e1dde2a6	287	/* Note : VIK_GZ(17) / xzoom / 2 = number of tile on Y axis */
90f15672	288	g_debug("%s: xzoom=%f yzoom=%f -> %f", __FUNCTION__,
e1dde2a6 RN	289	xzoom, yzoom, VIK_GZ(17) / xzoom / 2);
e1dde2a6 RN	290	dest->x = floor((src->east_west + 180) / 180 * VIK_GZ(17) / xzoom / 2);
90f15672 GB	291	/* We should restore logic of viking:
	292	* tile index on Y axis follow a screen logic (top -> down)
	293	*/
e1dde2a6	294	dest->y = floor((180 - (src->north_south + 90)) / 180 * VIK_GZ(17) / xzoom / 2);
90f15672 GB	295	dest->z = 0;
	296	g_debug("%s: %f,%f -> %d,%d", __FUNCTION__,
	297	src->east_west, src->north_south, dest->x, dest->y);
	298	return TRUE;
	299	}
	300
	301	static void
	302	_mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest )
	303	{
	304	gdouble socalled_mpp;
	305	if (src->scale >= 0)
e1dde2a6	306	socalled_mpp = VIK_GZ(src->scale);
90f15672	307	else
e1dde2a6	308	socalled_mpp = 1.0/VIK_GZ(-src->scale);
90f15672	309	dest->mode = VIK_COORD_LATLON;
e1dde2a6	310	dest->east_west = (src->x+0.5) * 180 / VIK_GZ(17) * socalled_mpp * 2 - 180;
90f15672 GB	311	/* We should restore logic of viking:
	312	* tile index on Y axis follow a screen logic (top -> down)
	313	*/
e1dde2a6	314	dest->north_south = -((src->y+0.5) * 180 / VIK_GZ(17) * socalled_mpp * 2 - 90);
90f15672 GB	315	g_debug("%s: %d,%d -> %f,%f", __FUNCTION__,
	316	src->x, src->y, dest->east_west, dest->north_south);
	317	}
	318
	319	static gchar *
	320	_get_uri( VikMapSourceDefault self, MapCoord src )
	321	{
	322	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL);
	323
	324	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
90f15672 GB	325	/* We should restore logic of viking:
	326	* tile index on Y axis follow a screen logic (top -> down)
	327	*/
	328
	329	/* Note : nb tiles on Y axis */
e1dde2a6	330	gint nb_tiles = VIK_GZ(17 - src->scale - 1);
90f15672 GB	331
	332	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale - 1, src->x, nb_tiles - src->y - 1);
	333
	334	return uri;
	335	}
	336
	337	static gchar *
	338	_get_hostname( VikMapSourceDefault *self )
	339	{
	340	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL);
	341
	342	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	343	return g_strdup( priv->hostname );
	344	}
	345
	346	static DownloadMapOptions *
	347	_get_download_options( VikMapSourceDefault *self )
	348	{
	349	g_return_val_if_fail (VIK_IS_TMS_MAP_SOURCE(self), NULL);
	350
	351	VikTmsMapSourcePrivate *priv = VIK_TMS_MAP_SOURCE_PRIVATE(self);
	352	return &(priv->options);
	353	}
	354
	355	VikTmsMapSource *
	356	vik_tms_map_source_new_with_id (guint8 id, const gchar label, const gchar hostname, const gchar *url)
	357	{
	358	return g_object_new(VIK_TYPE_TMS_MAP_SOURCE,
	359	"id", id, "label", label, "hostname", hostname, "url", url, NULL);
	360	}