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

/* -*- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -*- */
/*
 * viking
 * Copyright (C) 2009, 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 3 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:vikslippymapsource
  * @short_description: the class for SlippyMap oriented map sources
  * 
  * The #VikSlippyMapSource class handles slippy map oriented map sources.
  * The related service is tile oriented, à la Google.
  * 
  * The tiles are in 'google spherical mercator', which is
  * basically a mercator projection that assumes a spherical earth.
  * http://docs.openlayers.org/library/spherical_mercator.html
  * 
  * 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
  * But take care that the Y axis is inverted, ie the origin is at top-left
  * corner.
  * Following this specification, the protocol handled by this class
  * follows the global-mercator profile.
  * 
  * You can also find many interesting information on the OSM's wiki.
  * http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
  * http://wiki.openstreetmap.org/wiki/Setting_up_TMS
  */
  
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

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

#include "globals.h"
#include "vikslippymapsource.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 gchar *_get_uri( VikMapSourceDefault *self, MapCoord *src );
static gchar *_get_hostname( VikMapSourceDefault *self );
static DownloadMapOptions *_get_download_options( VikMapSourceDefault *self );

typedef struct _VikSlippyMapSourcePrivate VikSlippyMapSourcePrivate;
struct _VikSlippyMapSourcePrivate
{
  gchar *hostname;
  gchar *url;
  DownloadMapOptions options;
};

#define VIK_SLIPPY_MAP_SOURCE_PRIVATE(o)  (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_SLIPPY_MAP_SOURCE, VikSlippyMapSourcePrivate))

/* properties */
enum
{
  PROP_0,

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

G_DEFINE_TYPE (VikSlippyMapSource, vik_slippy_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT);

static void
vik_slippy_map_source_init (VikSlippyMapSource *self)
{
  /* initialize the object here */
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_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_MERCATOR,
                NULL);
}

static void
vik_slippy_map_source_finalize (GObject *object)
{
  VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_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_slippy_map_source_parent_class)->finalize (object);
}

static void
vik_slippy_map_source_set_property (GObject      *object,
                                    guint         property_id,
                                    const GValue *value,
                                    GParamSpec   *pspec)
{
  VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_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;

    case PROP_USE_ETAG:
      priv->options.use_etag = 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_slippy_map_source_get_property (GObject    *object,
                                    guint       property_id,
                                    GValue     *value,
                                    GParamSpec *pspec)
{
  VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_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;
	  
    case PROP_USE_ETAG:
      g_value_set_boolean (value, priv->options.use_etag);
      break;

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

static void
vik_slippy_map_source_class_init (VikSlippyMapSourceClass *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_slippy_map_source_set_property;
    object_class->get_property = vik_slippy_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;

	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_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_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);

	pspec = g_param_spec_boolean ("use-etag",
	                              "Use etag values with server",
                                  "Store etag in a file, and send it to server to check if we have the latest file",
                                  FALSE  /* default value */,
                                  G_PARAM_CONSTRUCT_ONLY | G_PARAM_READWRITE);
	g_object_class_install_property (object_class, PROP_USE_ETAG, pspec);

	g_type_class_add_private (klass, sizeof (VikSlippyMapSourcePrivate));
	
	object_class->finalize = vik_slippy_map_source_finalize;
}

/* 1 << (x) is like a 2**(x) */
#define GZ(x) ((1<<(x)))

static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9),
                                           GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };

static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));

static const gdouble scale_neg_mpps[] = { 1.0/GZ(0), 1.0/GZ(1), 1.0/GZ(2), 1.0/GZ(3) };
static const gint num_scales_neg = (sizeof(scale_neg_mpps) / sizeof(scale_neg_mpps[0]));

#define ERROR_MARGIN 0.01
gint
vik_slippy_map_source_zoom_to_scale ( gdouble mpp ) {
  gint i;
  for ( i = 0; i < num_scales; i++ ) {
    if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) {
      return i;
    }
  }
  for ( i = 0; i < num_scales_neg; i++ ) {
    if ( ABS(scale_neg_mpps[i] - mpp) < 0.000001 ) {
      return -i;
    }
  }

  return 255;
}

gboolean
_supports_download_only_new (VikMapSource *self)
{
  g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), FALSE);
	
  VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	
  return priv->options.check_file_server_time || priv->options.use_etag;
}

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

  dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
  dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
  dest->z = 0;

  return TRUE;
}

static void
_mapcoord_to_center_coord ( VikMapSource *self, MapCoord *src, VikCoord *dest )
{
  gdouble socalled_mpp;
  if (src->scale >= 0)
    socalled_mpp = GZ(src->scale);
  else
    socalled_mpp = 1.0/GZ(-src->scale);
  dest->mode = VIK_COORD_LATLON;
  dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
  dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
}

static gchar *
_get_uri( VikMapSourceDefault *self, MapCoord *src )
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	
    VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale, src->x, src->y);
	return uri;
} 

static gchar *
_get_hostname( VikMapSourceDefault *self )
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	
    VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	return g_strdup( priv->hostname );
}

static DownloadMapOptions *
_get_download_options( VikMapSourceDefault *self )
{
	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	
	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	return &(priv->options);
}

VikSlippyMapSource *
vik_slippy_map_source_new_with_id (guint8 id, const gchar *label, const gchar *hostname, const gchar *url)
{
	return g_object_new(VIK_TYPE_SLIPPY_MAP_SOURCE,
	                    "id", id, "label", label, "hostname", hostname, "url", url, NULL);
}
Commit	Line	Data
e3a90009 GB	1	/* -- Mode: C; indent-tabs-mode: t; c-basic-offset: 4; tab-width: 4 -- */
	2	/*
	3	* viking
a482007a	4	* Copyright (C) 2009, Guilhem Bonnefille <guilhem.bonnefille@gmail.com>
e3a90009 GB	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	*/
dfc4db8b GB	19
	20	/**
	21	* SECTION:vikslippymapsource
	22	* @short_description: the class for SlippyMap oriented map sources
	23	*
	24	* The #VikSlippyMapSource class handles slippy map oriented map sources.
	25	* The related service is tile oriented, à la Google.
	26	*
	27	* The tiles are in 'google spherical mercator', which is
	28	* basically a mercator projection that assumes a spherical earth.
	29	* http://docs.openlayers.org/library/spherical_mercator.html
	30	*
	31	* Such service is also a type of TMS (Tile Map Service) as defined in
	32	* OSGeo's wiki.
	33	* http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification
	34	* But take care that the Y axis is inverted, ie the origin is at top-left
	35	* corner.
	36	* Following this specification, the protocol handled by this class
	37	* follows the global-mercator profile.
	38	*
	39	* You can also find many interesting information on the OSM's wiki.
	40	* http://wiki.openstreetmap.org/wiki/Slippy_map_tilenames
	41	* http://wiki.openstreetmap.org/wiki/Setting_up_TMS
	42	*/
	43
e3a90009 GB	44	#ifdef HAVE_CONFIG_H
	45	#include "config.h"
	46	#endif
	47
	48	#ifdef HAVE_MATH_H
	49	#include <math.h>
	50	#endif
	51
	52	#include "globals.h"
8eb12ac6	53	#include "vikslippymapsource.h"
e3a90009 GB	54
	55	static gboolean _coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest );
	56	static void _mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest );
f66ea3ec	57
c81ded98	58	static gboolean _supports_download_only_new (VikMapSource *self );
e3a90009	59
f66ea3ec GB	60	static gchar _get_uri( VikMapSourceDefault self, MapCoord *src );
	61	static gchar _get_hostname( VikMapSourceDefault self );
	62	static DownloadMapOptions _get_download_options( VikMapSourceDefault self );
e3a90009	63
8eb12ac6 GB	64	typedef struct _VikSlippyMapSourcePrivate VikSlippyMapSourcePrivate;
	65	struct _VikSlippyMapSourcePrivate
	66	{
	67	gchar *hostname;
	68	gchar *url;
b529dc9c	69	DownloadMapOptions options;
8eb12ac6 GB	70	};
	71
	72	#define VIK_SLIPPY_MAP_SOURCE_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), VIK_TYPE_SLIPPY_MAP_SOURCE, VikSlippyMapSourcePrivate))
	73
4e53f3dc GB	74	/* properties */
	75	enum
	76	{
	77	PROP_0,
	78
	79	PROP_HOSTNAME,
	80	PROP_URL,
c395c6a5 GB	81	PROP_REFERER,
c395c6a5 GB	82	PROP_FOLLOW_LOCATION,
0f08bd0d	83	PROP_CHECK_FILE_SERVER_TIME,
05dbd9ba	84	PROP_USE_ETAG,
4e53f3dc GB	85	};
4e53f3dc GB	86
f6411015	87	G_DEFINE_TYPE (VikSlippyMapSource, vik_slippy_map_source, VIK_TYPE_MAP_SOURCE_DEFAULT);
e3a90009 GB	88
e3a90009 GB	89	static void
3a84e537	90	vik_slippy_map_source_init (VikSlippyMapSource *self)
e3a90009	91	{
9cca9d93 GB	92	/* initialize the object here */
	93	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	94
	95	priv->hostname = NULL;
	96	priv->url = NULL;
c395c6a5 GB	97	priv->options.referer = NULL;
	98	priv->options.follow_location = 0;
	99	priv->options.check_file = a_check_map_file;
6693f5f9	100	priv->options.check_file_server_time = FALSE;
9cca9d93 GB	101
	102	g_object_set (G_OBJECT (self),
	103	"tilesize-x", 256,
	104	"tilesize-y", 256,
	105	"drawmode", VIK_VIEWPORT_DRAWMODE_MERCATOR,
	106	NULL);
e3a90009 GB	107	}
	108
	109	static void
8eb12ac6	110	vik_slippy_map_source_finalize (GObject *object)
e3a90009	111	{
9cca9d93 GB	112	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	113	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	114
	115	g_free (priv->hostname);
	116	priv->hostname = NULL;
	117	g_free (priv->url);
	118	priv->url = NULL;
c395c6a5 GB	119	g_free (priv->options.referer);
c395c6a5 GB	120	priv->options.referer = NULL;
e3a90009	121
9cca9d93	122	G_OBJECT_CLASS (vik_slippy_map_source_parent_class)->finalize (object);
e3a90009 GB	123	}
e3a90009 GB	124
4e53f3dc GB	125	static void
	126	vik_slippy_map_source_set_property (GObject *object,
	127	guint property_id,
	128	const GValue *value,
	129	GParamSpec *pspec)
	130	{
	131	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	132	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	133
	134	switch (property_id)
	135	{
	136	case PROP_HOSTNAME:
	137	g_free (priv->hostname);
	138	priv->hostname = g_value_dup_string (value);
	139	break;
	140
	141	case PROP_URL:
	142	g_free (priv->url);
	143	priv->url = g_value_dup_string (value);
	144	break;
	145
c395c6a5 GB	146	case PROP_REFERER:
	147	g_free (priv->options.referer);
	148	priv->options.referer = g_value_dup_string (value);
	149	break;
	150
	151	case PROP_FOLLOW_LOCATION:
	152	priv->options.follow_location = g_value_get_long (value);
	153	break;
	154
0f08bd0d	155	case PROP_CHECK_FILE_SERVER_TIME:
6693f5f9	156	priv->options.check_file_server_time = g_value_get_boolean (value);
0f08bd0d GB	157	break;
0f08bd0d GB	158
05dbd9ba JJ	159	case PROP_USE_ETAG:
	160	priv->options.use_etag = g_value_get_boolean (value);
	161	break;
	162
4e53f3dc GB	163	default:
	164	/* We don't have any other property... */
	165	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	166	break;
	167	}
	168	}
	169
	170	static void
	171	vik_slippy_map_source_get_property (GObject *object,
	172	guint property_id,
	173	GValue *value,
	174	GParamSpec *pspec)
	175	{
	176	VikSlippyMapSource *self = VIK_SLIPPY_MAP_SOURCE (object);
	177	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE (self);
	178
	179	switch (property_id)
	180	{
	181	case PROP_HOSTNAME:
	182	g_value_set_string (value, priv->hostname);
	183	break;
	184
	185	case PROP_URL:
	186	g_value_set_string (value, priv->url);
	187	break;
	188
c395c6a5 GB	189	case PROP_REFERER:
	190	g_value_set_string (value, priv->options.referer);
	191	break;
	192
	193	case PROP_FOLLOW_LOCATION:
	194	g_value_set_long (value, priv->options.follow_location);
	195	break;
	196
0f08bd0d	197	case PROP_CHECK_FILE_SERVER_TIME:
6693f5f9	198	g_value_set_boolean (value, priv->options.check_file_server_time);
0f08bd0d GB	199	break;
0f08bd0d GB	200
05dbd9ba JJ	201	case PROP_USE_ETAG:
	202	g_value_set_boolean (value, priv->options.use_etag);
	203	break;
	204
4e53f3dc GB	205	default:
	206	/* We don't have any other property... */
	207	G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
	208	break;
	209	}
	210	}
	211
e3a90009	212	static void
8eb12ac6	213	vik_slippy_map_source_class_init (VikSlippyMapSourceClass *klass)
e3a90009 GB	214	{
e3a90009 GB	215	GObjectClass* object_class = G_OBJECT_CLASS (klass);
de674329	216	VikMapSourceClass* grandparent_class = VIK_MAP_SOURCE_CLASS (klass);
f66ea3ec	217	VikMapSourceDefaultClass* parent_class = VIK_MAP_SOURCE_DEFAULT_CLASS (klass);
4e53f3dc GB	218	GParamSpec *pspec = NULL;
	219
	220	object_class->set_property = vik_slippy_map_source_set_property;
	221	object_class->get_property = vik_slippy_map_source_get_property;
e3a90009 GB	222
e3a90009 GB	223	/* Overiding methods */
de674329 RN	224	grandparent_class->coord_to_mapcoord = _coord_to_mapcoord;
	225	grandparent_class->mapcoord_to_center_coord = _mapcoord_to_center_coord;
	226	grandparent_class->supports_download_only_new = _supports_download_only_new;
f66ea3ec GB	227
	228	parent_class->get_uri = _get_uri;
	229	parent_class->get_hostname = _get_hostname;
	230	parent_class->get_download_options = _get_download_options;
4e53f3dc GB	231
	232	pspec = g_param_spec_string ("hostname",
	233	"Hostname",
	234	"The hostname of the map server",
	235	"<no-set>" /* default value */,
9f58c4b4	236	G_PARAM_READWRITE);
4e53f3dc GB	237	g_object_class_install_property (object_class, PROP_HOSTNAME, pspec);
	238
	239	pspec = g_param_spec_string ("url",
	240	"URL",
	241	"The template of the tiles' URL",
	242	"<no-set>" /* default value */,
9f58c4b4	243	G_PARAM_READWRITE);
4e53f3dc	244	g_object_class_install_property (object_class, PROP_URL, pspec);
c395c6a5 GB	245
	246	pspec = g_param_spec_string ("referer",
	247	"Referer",
	248	"The REFERER string to use in HTTP request",
	249	NULL /* default value */,
	250	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	251	g_object_class_install_property (object_class, PROP_REFERER, pspec);
8eb12ac6	252
c395c6a5 GB	253	pspec = g_param_spec_long ("follow-location",
	254	"Follow location",
	255	"Specifies the number of retries to follow a redirect while downloading a page",
	256	0 /* minimum value */,
	257	G_MAXLONG /* maximum value */,
	258	0 /* default value */,
	259	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	260	g_object_class_install_property (object_class, PROP_FOLLOW_LOCATION, pspec);
0f08bd0d	261
6693f5f9 GB	262	pspec = g_param_spec_boolean ("check-file-server-time",
	263	"Check file server time",
	264	"Age of current cache before redownloading tile",
	265	FALSE /* default value */,
	266	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
0f08bd0d	267	g_object_class_install_property (object_class, PROP_CHECK_FILE_SERVER_TIME, pspec);
c395c6a5	268
05dbd9ba JJ	269	pspec = g_param_spec_boolean ("use-etag",
	270	"Use etag values with server",
	271	"Store etag in a file, and send it to server to check if we have the latest file",
	272	FALSE /* default value */,
	273	G_PARAM_CONSTRUCT_ONLY \| G_PARAM_READWRITE);
	274	g_object_class_install_property (object_class, PROP_USE_ETAG, pspec);
	275
8eb12ac6 GB	276	g_type_class_add_private (klass, sizeof (VikSlippyMapSourcePrivate));
	277
	278	object_class->finalize = vik_slippy_map_source_finalize;
e3a90009 GB	279	}
	280
	281	/* 1 << (x) is like a 2*(x) /
a2833555	282	#define GZ(x) ((1<<(x)))
e3a90009 GB	283
	284	static const gdouble scale_mpps[] = { GZ(0), GZ(1), GZ(2), GZ(3), GZ(4), GZ(5), GZ(6), GZ(7), GZ(8), GZ(9),
	285	GZ(10), GZ(11), GZ(12), GZ(13), GZ(14), GZ(15), GZ(16), GZ(17) };
	286
	287	static const gint num_scales = (sizeof(scale_mpps) / sizeof(scale_mpps[0]));
	288
d1302dec JJ	289	static const gdouble scale_neg_mpps[] = { 1.0/GZ(0), 1.0/GZ(1), 1.0/GZ(2), 1.0/GZ(3) };
	290	static const gint num_scales_neg = (sizeof(scale_neg_mpps) / sizeof(scale_neg_mpps[0]));
	291
e3a90009	292	#define ERROR_MARGIN 0.01
9f58c4b4 GB	293	gint
9f58c4b4 GB	294	vik_slippy_map_source_zoom_to_scale ( gdouble mpp ) {
e3a90009 GB	295	gint i;
e3a90009 GB	296	for ( i = 0; i < num_scales; i++ ) {
d1302dec	297	if ( ABS(scale_mpps[i] - mpp) < ERROR_MARGIN ) {
e3a90009	298	return i;
d1302dec	299	}
e3a90009	300	}
d1302dec JJ	301	for ( i = 0; i < num_scales_neg; i++ ) {
	302	if ( ABS(scale_neg_mpps[i] - mpp) < 0.000001 ) {
	303	return -i;
	304	}
	305	}
	306
e3a90009 GB	307	return 255;
	308	}
	309
0f08bd0d	310	gboolean
c81ded98	311	_supports_download_only_new (VikMapSource *self)
0f08bd0d	312	{
c81ded98	313	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), FALSE);
0f08bd0d	314
c81ded98	315	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
0f08bd0d	316
c81ded98	317	return priv->options.check_file_server_time \|\| priv->options.use_etag;
0f08bd0d	318	}
f66ea3ec	319
e3a90009 GB	320	static gboolean
	321	_coord_to_mapcoord ( VikMapSource self, const VikCoord src, gdouble xzoom, gdouble yzoom, MapCoord *dest )
	322	{
	323	g_assert ( src->mode == VIK_COORD_LATLON );
	324
	325	if ( xzoom != yzoom )
	326	return FALSE;
	327
9f58c4b4	328	dest->scale = vik_slippy_map_source_zoom_to_scale ( xzoom );
e3a90009 GB	329	if ( dest->scale == 255 )
	330	return FALSE;
	331
	332	dest->x = (src->east_west + 180) / 360 * GZ(17) / xzoom;
	333	dest->y = (180 - MERCLAT(src->north_south)) / 360 * GZ(17) / xzoom;
	334	dest->z = 0;
	335
	336	return TRUE;
	337	}
	338
	339	static void
	340	_mapcoord_to_center_coord ( VikMapSource self, MapCoord src, VikCoord *dest )
	341	{
d1302dec JJ	342	gdouble socalled_mpp;
	343	if (src->scale >= 0)
	344	socalled_mpp = GZ(src->scale);
	345	else
	346	socalled_mpp = 1.0/GZ(-src->scale);
e3a90009 GB	347	dest->mode = VIK_COORD_LATLON;
	348	dest->east_west = ((src->x+0.5) / GZ(17) * socalled_mpp * 360) - 180;
	349	dest->north_south = DEMERCLAT(180 - ((src->y+0.5) / GZ(17) * socalled_mpp * 360));
	350	}
	351
8eb12ac6	352	static gchar *
f66ea3ec	353	_get_uri( VikMapSourceDefault self, MapCoord src )
8eb12ac6 GB	354	{
	355	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	356
	357	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	358	gchar *uri = g_strdup_printf (priv->url, 17 - src->scale, src->x, src->y);
	359	return uri;
	360	}
	361
	362	static gchar *
f66ea3ec	363	_get_hostname( VikMapSourceDefault *self )
8eb12ac6 GB	364	{
	365	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	366
	367	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
	368	return g_strdup( priv->hostname );
	369	}
	370
b529dc9c	371	static DownloadMapOptions *
f66ea3ec	372	_get_download_options( VikMapSourceDefault *self )
8eb12ac6 GB	373	{
	374	g_return_val_if_fail (VIK_IS_SLIPPY_MAP_SOURCE(self), NULL);
	375
c395c6a5 GB	376	VikSlippyMapSourcePrivate *priv = VIK_SLIPPY_MAP_SOURCE_PRIVATE(self);
c395c6a5 GB	377	return &(priv->options);
8eb12ac6 GB	378	}
	379
	380	VikSlippyMapSource *
db03733a	381	vik_slippy_map_source_new_with_id (guint8 id, const gchar label, const gchar hostname, const gchar *url)
8eb12ac6	382	{
4e53f3dc	383	return g_object_new(VIK_TYPE_SLIPPY_MAP_SOURCE,
db03733a	384	"id", id, "label", label, "hostname", hostname, "url", url, NULL);
c395c6a5	385	}