def reformat_selected_layers(json_tile_data, layer_data, coord, format):
"""
Reformats the selected (subset of) layers from a JSON tile containing all
layers. We store "tiles of record" containing all layers as JSON, and this
function does most of the work of reading that, pruning the layers which
aren't needed and reformatting it to the desired output format.
"""
feature_layers = decode_json_tile_for_layers(json_tile_data, layer_data)
bounds_merc = coord_to_mercator_bounds(coord)
bounds_wgs84 = (
mercator_point_to_wgs84(bounds_merc[:2]) +
mercator_point_to_wgs84(bounds_merc[2:4]))
padded_bounds_merc = pad_bounds_for_zoom(bounds_merc, coord.zoom)
scale = 4096
feature_layers = transform_feature_layers_shape(
feature_layers, format, scale, bounds_merc,
padded_bounds_merc, coord)
tile_data_file = StringIO()
format.format_tile(tile_data_file, feature_layers, coord,
bounds_merc, bounds_wgs84)
tile_data = tile_data_file.getvalue()
return tile_data
def reformat_selected_layers(
json_tile_data, layer_data, coord, format, buffer_cfg):
"""
Reformats the selected (subset of) layers from a JSON tile containing all
layers. We store "tiles of record" containing all layers as JSON, and this
function does most of the work of reading that, pruning the layers which
aren't needed and reformatting it to the desired output format.
"""
feature_layers = decode_json_tile_for_layers(json_tile_data, layer_data)
bounds_merc = coord_to_mercator_bounds(coord)
bounds_lnglat = (
mercator_point_to_lnglat(bounds_merc[0], bounds_merc[1]) +
mercator_point_to_lnglat(bounds_merc[2], bounds_merc[3]))
meters_per_pixel_dim = calc_meters_per_pixel_dim(coord.zoom)
scale = 4096
feature_layers = transform_feature_layers_shape(
feature_layers, format, scale, bounds_merc,
coord, meters_per_pixel_dim, buffer_cfg)
tile_data_file = StringIO()
format.format_tile(tile_data_file, feature_layers, coord,
bounds_merc, bounds_lnglat)
tile_data = tile_data_file.getvalue()
return tile_data
def reformat_selected_layers(
json_tile_data, layer_data, coord, format, buffer_cfg):
"""
Reformats the selected (subset of) layers from a JSON tile containing all
layers. We store "tiles of record" containing all layers as JSON, and this
function does most of the work of reading that, pruning the layers which
aren't needed and reformatting it to the desired output format.
"""
feature_layers = decode_json_tile_for_layers(json_tile_data, layer_data)
bounds_merc = coord_to_mercator_bounds(coord)
bounds_lnglat = (
mercator_point_to_lnglat(bounds_merc[0], bounds_merc[1]) +
mercator_point_to_lnglat(bounds_merc[2], bounds_merc[3]))
meters_per_pixel_dim = calc_meters_per_pixel_dim(coord.zoom)
scale = 4096
feature_layers = transform_feature_layers_shape(
feature_layers, format, scale, bounds_merc,
coord, meters_per_pixel_dim, buffer_cfg)
tile_data_file = StringIO()
format.format_tile(tile_data_file, feature_layers, coord,
bounds_merc, bounds_lnglat)
tile_data = tile_data_file.getvalue()
return tile_data
def _create_formatted_tile(feature_layers, format, scale, unpadded_bounds,
unpadded_bounds_lnglat, coord, layer,
meters_per_pixel_dim, buffer_cfg):
# perform format specific transformations
transformed_feature_layers = transform_feature_layers_shape(
feature_layers, format, scale, unpadded_bounds, coord,
meters_per_pixel_dim, buffer_cfg)
# use the formatter to generate the tile
tile_data_file = StringIO()
format.format_tile(tile_data_file, transformed_feature_layers, coord,
unpadded_bounds, unpadded_bounds_lnglat)
tile = tile_data_file.getvalue()
formatted_tile = dict(format=format, tile=tile, coord=coord, layer=layer)
return formatted_tile
def _create_formatted_tile(
feature_layers, format, scale, unpadded_bounds, unpadded_bounds_lnglat,
coord, layer, meters_per_pixel_dim, buffer_cfg):
# perform format specific transformations
transformed_feature_layers = transform_feature_layers_shape(
feature_layers, format, scale, unpadded_bounds, coord,
meters_per_pixel_dim, buffer_cfg)
# use the formatter to generate the tile
tile_data_file = StringIO()
format.format_tile(tile_data_file, transformed_feature_layers, coord,
unpadded_bounds, unpadded_bounds_lnglat)
tile = tile_data_file.getvalue()
formatted_tile = dict(format=format, tile=tile, coord=coord, layer=layer)
return formatted_tile