/**
* champlain_map_source_factory_create_cached_source:
* @factory: the Factory
* @id: the wanted map source id
*
* Creates a cached map source.
*
* Returns: (transfer none): a ready to use #ChamplainMapSourceChain consisting of
* #ChamplainMemoryCache, #ChamplainFileCache, #ChamplainMapSource matching the given name, and
* an error tile source created with champlain_map_source_factory_create_error_source ().
*
* Since: 0.6
*/
ChamplainMapSource *
champlain_map_source_factory_create_cached_source (ChamplainMapSourceFactory *factory,
const gchar *id)
{
ChamplainMapSourceChain *source_chain;
ChamplainMapSource *tile_source;
ChamplainMapSource *error_source;
ChamplainMapSource *memory_cache;
ChamplainMapSource *file_cache;
guint tile_size;
ChamplainRenderer *renderer;
tile_source = champlain_map_source_factory_create (factory, id);
tile_size = champlain_map_source_get_tile_size (tile_source);
error_source = champlain_map_source_factory_create_error_source (factory, tile_size);
renderer = CHAMPLAIN_RENDERER (champlain_image_renderer_new ());
file_cache = CHAMPLAIN_MAP_SOURCE (champlain_file_cache_new_full (100000000, NULL, renderer));
renderer = CHAMPLAIN_RENDERER (champlain_image_renderer_new ());
memory_cache = CHAMPLAIN_MAP_SOURCE (champlain_memory_cache_new_full (100, renderer));
source_chain = champlain_map_source_chain_new ();
champlain_map_source_chain_push (source_chain, error_source);
champlain_map_source_chain_push (source_chain, tile_source);
champlain_map_source_chain_push (source_chain, file_cache);
champlain_map_source_chain_push (source_chain, memory_cache);
return CHAMPLAIN_MAP_SOURCE (source_chain);
}
static guint
get_tile_size (ChamplainMapSource *map_source)
{
ChamplainMapSourceChain *source_chain = CHAMPLAIN_MAP_SOURCE_CHAIN (map_source);
g_return_val_if_fail (source_chain, 0);
ChamplainMapSourceChainPrivate *priv = source_chain->priv;
g_return_val_if_fail (priv->stack_top, 0);
return champlain_map_source_get_tile_size (priv->stack_top);
}
static guint
get_tile_size (ChamplainMapSource *map_source)
{
g_return_val_if_fail (CHAMPLAIN_IS_TILE_CACHE (map_source), 0);
ChamplainMapSource *next_source = champlain_map_source_get_next_source (map_source);
g_return_val_if_fail (CHAMPLAIN_IS_MAP_SOURCE (next_source), 0);
return champlain_map_source_get_tile_size (next_source);
}
/**
* champlain_map_source_get_x:
* @map_source: a #ChamplainMapSource
* @zoom_level: the zoom level
* @longitude: a longitude
*
* Gets the x position on the map using this map source's projection.
* (0, 0) is located at the top left.
*
* Returns: the x position
*
* Since: 0.4
*/
gdouble
champlain_map_source_get_x (ChamplainMapSource *map_source,
guint zoom_level,
gdouble longitude)
{
g_return_val_if_fail (CHAMPLAIN_IS_MAP_SOURCE (map_source), 0);
longitude = CLAMP (longitude, CHAMPLAIN_MIN_LONGITUDE, CHAMPLAIN_MAX_LONGITUDE);
/* FIXME: support other projections */
return ((longitude + 180.0) / 360.0 * pow (2.0, zoom_level)) * champlain_map_source_get_tile_size (map_source);
}
/**
* champlain_map_source_get_y:
* @map_source: a #ChamplainMapSource
* @zoom_level: the zoom level
* @latitude: a latitude
*
* Gets the y position on the map using this map source's projection.
* (0, 0) is located at the top left.
*
* Returns: the y position
*
* Since: 0.4
*/
gdouble
champlain_map_source_get_y (ChamplainMapSource *map_source,
guint zoom_level,
gdouble latitude)
{
g_return_val_if_fail (CHAMPLAIN_IS_MAP_SOURCE (map_source), 0);
latitude = CLAMP (latitude, CHAMPLAIN_MIN_LATITUDE, CHAMPLAIN_MAX_LATITUDE);
/* FIXME: support other projections */
return ((1.0 - log (tan (latitude * M_PI / 180.0) + 1.0 / cos (latitude * M_PI / 180.0)) / M_PI) /
2.0 * pow (2.0, zoom_level)) * champlain_map_source_get_tile_size (map_source);
}
/**
* champlain_map_source_get_longitude:
* @map_source: a #ChamplainMapSource
* @zoom_level: the zoom level
* @x: a x position
*
* Gets the longitude corresponding to this x position in the map source's
* projection.
*
* Returns: the longitude
*
* Since: 0.4
*/
gdouble
champlain_map_source_get_longitude (ChamplainMapSource *map_source,
guint zoom_level,
gdouble x)
{
gdouble longitude;
g_return_val_if_fail (CHAMPLAIN_IS_MAP_SOURCE (map_source), 0.0);
/* FIXME: support other projections */
gdouble dx = (gdouble) x / champlain_map_source_get_tile_size (map_source);
longitude = dx / pow (2.0, zoom_level) * 360.0 - 180.0;
return CLAMP (longitude, CHAMPLAIN_MIN_LONGITUDE, CHAMPLAIN_MAX_LONGITUDE);
}
static void
get_map_size (ChamplainView *view, gint *width, gint *height)
{
gint size, rows, cols;
ChamplainMapSource *map_source = champlain_view_get_map_source (view);
gint zoom_level = champlain_view_get_zoom_level (view);
size = champlain_map_source_get_tile_size (map_source);
rows = champlain_map_source_get_row_count (map_source,
zoom_level);
cols = champlain_map_source_get_column_count (map_source,
zoom_level);
*width = size * rows;
*height = size * cols;
}
/**
* champlain_map_source_get_latitude:
* @map_source: a #ChamplainMapSource
* @zoom_level: the zoom level
* @y: a y position
*
* Gets the latitude corresponding to this y position in the map source's
* projection.
*
* Returns: the latitude
*
* Since: 0.4
*/
gdouble
champlain_map_source_get_latitude (ChamplainMapSource *map_source,
guint zoom_level,
gdouble y)
{
gdouble latitude;
g_return_val_if_fail (CHAMPLAIN_IS_MAP_SOURCE (map_source), 0.0);
/* FIXME: support other projections */
gdouble dy = (gdouble) y / champlain_map_source_get_tile_size (map_source);
gdouble n = M_PI - 2.0 * M_PI * dy / pow (2.0, zoom_level);
latitude = 180.0 / M_PI *atan (0.5 * (exp (n) - exp (-n)));
return CLAMP (latitude, CHAMPLAIN_MIN_LATITUDE, CHAMPLAIN_MAX_LATITUDE);
}
/**
* champlain_map_source_get_meters_per_pixel:
* @map_source: a #ChamplainMapSource
* @zoom_level: the zoom level
* @latitude: a latitude
* @longitude: a longitude
*
* Gets meters per pixel at the position on the map using this map source's projection.
*
* Returns: the meters per pixel
*
* Since: 0.4.3
*/
gdouble
champlain_map_source_get_meters_per_pixel (ChamplainMapSource *map_source,
guint zoom_level,
gdouble latitude,
G_GNUC_UNUSED gdouble longitude)
{
g_return_val_if_fail (CHAMPLAIN_IS_MAP_SOURCE (map_source), 0.0);
/*
* Width is in pixels. (1 px)
* m/px = radius_at_latitude / width_in_pixels
* k = radius of earth = 6 378.1 km
* radius_at_latitude = 2pi * k * sin (pi/2-theta)
*/
gdouble tile_size = champlain_map_source_get_tile_size (map_source);
/* FIXME: support other projections */
return 2.0 *M_PI *EARTH_RADIUS *sin (M_PI / 2.0 - M_PI / 180.0 *latitude) /
(tile_size * champlain_map_source_get_row_count (map_source, zoom_level));
}
/**
* champlain_map_source_factory_create_cached_source:
* @factory: the Factory
* @id: the wanted map source id
*
* Creates a cached map source.
*
* Returns: a ready to use #ChamplainMapSourceChain consisting of
* #ChamplainFileCache, #ChamplainMapSource matching the given name, and
* #ChamplainErrorTileSource.
*
* Since: 0.6
*/
ChamplainMapSource * champlain_map_source_factory_create_cached_source (ChamplainMapSourceFactory *factory,
const gchar *id)
{
ChamplainMapSourceChain *source_chain;
ChamplainMapSource *tile_source;
ChamplainMapSource *error_source;
ChamplainMapSource *file_cache;
guint tile_size;
tile_source = champlain_map_source_factory_create (factory, id);
tile_size = champlain_map_source_get_tile_size (tile_source);
error_source = CHAMPLAIN_MAP_SOURCE(champlain_error_tile_source_new_full (tile_size));
file_cache = CHAMPLAIN_MAP_SOURCE(champlain_file_cache_new ());
source_chain = champlain_map_source_chain_new ();
champlain_map_source_chain_push (source_chain, error_source);
champlain_map_source_chain_push (source_chain, tile_source);
champlain_map_source_chain_push (source_chain, file_cache);
return CHAMPLAIN_MAP_SOURCE(source_chain);
}
