class MBTiles(object): """ Represent a MBTiles file """ objects = MBTilesManager() def __init__(self, name, catalog=None): self.catalog = catalog self.fullpath = self.objects.fullpath(name, catalog) self.basename = os.path.basename(self.fullpath) self._reader = MBTilesReader(self.fullpath, tilesize=app_settings.TILE_SIZE) @property def id(self): iD, ext = os.path.splitext(self.basename) return iD @property def name(self): return self.metadata.get('name', self.id) @property def filesize(self): return os.path.getsize(self.fullpath) @reify def metadata(self): return self._reader.metadata() @reify def bounds(self): bounds = self.metadata.get('bounds', '').split(',') if len(bounds) != 4: logger.warning(_("Invalid bounds metadata in '%s', fallback to whole world.") % self.name) bounds = [-180,-90,180,90] return tuple(map(float, bounds)) @reify def center(self): """ Return the center (x,y) of the map at this zoom level. """ center = self.metadata.get('center', '').split(',') if len(center) == 3: lon, lat, zoom = map(float, center) zoom = int(zoom) if zoom not in self.zoomlevels: logger.warning(_("Invalid zoom level (%s), fallback to middle zoom (%s)") % (zoom, self.middlezoom)) zoom = self.middlezoom return (lon, lat, zoom) # Invalid center from metadata, guess center from bounds lat = self.bounds[1] + (self.bounds[3] - self.bounds[1])/2 lon = self.bounds[0] + (self.bounds[2] - self.bounds[0])/2 return (lon, lat, self.middlezoom) @property def minzoom(self): z = self.metadata.get('minzoom', self.zoomlevels[0]) return int(z) @property def maxzoom(self): z = self.metadata.get('maxzoom', self.zoomlevels[-1]) return int(z) @property def middlezoom(self): return self.zoomlevels[len(self.zoomlevels)/2] @reify def zoomlevels(self): return self._reader.zoomlevels() def tile(self, z, x, y): try: return self._reader.tile(z, x, y) except ExtractionError: raise MissingTileError def center_tile(self): lon, lat, zoom = self.center proj = GoogleProjection(app_settings.TILE_SIZE, [zoom]) return proj.tile_at(zoom, (lon, lat)) def grid(self, z, x, y, callback=None): try: return self._reader.grid(z, x, y, callback) except ExtractionError: raise MissingTileError def tilejson(self, request): # Raw metadata jsonp = dict(self.metadata) # Post-processed metadata jsonp.update(**{ "bounds": self.bounds, "center": self.center, "minzoom": self.minzoom, "maxzoom": self.maxzoom, }) # Additionnal info try: kwargs = dict(name=self.id, x='{x}',y='{y}',z='{z}') if self.catalog: kwargs['catalog'] = self.catalog tilepattern = reverse("mbtilesmap:tile", kwargs=kwargs) gridpattern = reverse("mbtilesmap:grid", kwargs=kwargs) except NoReverseMatch: # In case django-mbtiles was not registered in namespace mbtilesmap tilepattern = reverse("tile", kwargs=dict(name=self.id, x='{x}',y='{y}',z='{z}')) gridpattern = reverse("grid", kwargs=dict(name=self.id, x='{x}',y='{y}',z='{z}')) tilepattern = request.build_absolute_uri(tilepattern) gridpattern = request.build_absolute_uri(gridpattern) tilepattern = tilepattern.replace('%7B', '{').replace('%7D', '}') gridpattern = gridpattern.replace('%7B', '{').replace('%7D', '}') jsonp.update(**{ "tilejson": "2.0.1", "id": self.id, "name": self.name, "scheme": "xyz", "basename": self.basename, "filesize": self.filesize, "tiles": [tilepattern], "grids": [gridpattern] }) return json.dumps(jsonp)
class MBTiles(object): """ Represent a MBTiles file """ objects = MBTilesManager() def __init__(self, name): """ Load a MBTile file. If `name` is a valid filepath, it will load it. Else, it will attempt to load it within `settings.MBTILES_ROOT` folder. """ mbtiles_file = name if not os.path.exists(mbtiles_file): if not os.path.exists(app_settings.MBTILES_ROOT): raise MBTilesFolderError() mbtiles_file = os.path.join(app_settings.MBTILES_ROOT, name) if not os.path.exists(mbtiles_file): mbtiles_file = "%s.%s" % (mbtiles_file, app_settings.MBTILES_EXT) if not os.path.exists(mbtiles_file): raise MBTilesNotFoundError(_("'%s' not found") % mbtiles_file) self.fullpath = mbtiles_file self.basename = os.path.basename(self.fullpath) self._reader = MBTilesReader(self.fullpath, tilesize=app_settings.TILE_SIZE) @property def id(self): iD, ext = os.path.splitext(self.basename) return iD @property def name(self): return self.metadata.get('name', self.id) @property def filesize(self): return os.path.getsize(self.fullpath) @reify def metadata(self): return self._reader.metadata() @reify def bounds(self): bounds = self.metadata.get('bounds', '').split(',') if len(bounds) != 4: logger.warning(_("Invalid bounds metadata in '%s', fallback to whole world.") % self.name) bounds = [-180,-90,180,90] return tuple(map(float, bounds)) @reify def center(self): """ Return the center (x,y) of the map at this zoom level. """ center = self.metadata.get('center', '').split(',') if len(center) == 3: lon, lat, zoom = map(float, center) zoom = int(zoom) if zoom not in self.zoomlevels: logger.warning(_("Invalid zoom level (%s), fallback to middle zoom (%s)") % (zoom, self.middlezoom)) zoom = self.middlezoom return (lon, lat, zoom) # Invalid center from metadata, guess center from bounds lat = self.bounds[1] + (self.bounds[3] - self.bounds[1])/2 lon = self.bounds[0] + (self.bounds[2] - self.bounds[0])/2 return (lon, lat, self.middlezoom) @property def minzoom(self): z = self.metadata.get('minzoom', self.zoomlevels[0]) return int(z) @property def maxzoom(self): z = self.metadata.get('maxzoom', self.zoomlevels[-1]) return int(z) @property def middlezoom(self): return self.zoomlevels[len(self.zoomlevels)/2] @reify def zoomlevels(self): return self._reader.zoomlevels() def tile(self, z, x, y): try: return self._reader.tile(z, x, y) except ExtractionError: raise MissingTileError def center_tile(self): lon, lat, zoom = self.center proj = GoogleProjection(app_settings.TILE_SIZE, [zoom]) return proj.tile_at(zoom, (lon, lat)) def grid(self, z, x, y, callback=None): try: return self._reader.grid(z, x, y, callback) except ExtractionError: raise MissingTileError def jsonp(self, request, callback): # Raw metadata jsonp = dict(self.metadata) # Post-processed metadata jsonp.update(**{ "bounds": self.bounds, "center": self.center, "minzoom": self.minzoom, "maxzoom": self.maxzoom, }) # Additionnal info tilepattern = reverse("mbtilesmap:tile", kwargs=dict(name=self.id, x='{x}',y='{y}',z='{z}')) tilepattern = request.build_absolute_uri(tilepattern) tilepattern = tilepattern.replace('%7B', '{').replace('%7D', '}') jsonp.update(**{ "id": self.id, "name": self.name, "scheme": "xyz", "basename": self.basename, "filesize": self.filesize, "tiles": [tilepattern], }) return '%s(%s);' % (callback, json.dumps(jsonp))