def render_full(z):
"""
Renders a full layer. The layer rendered is given by the z parameter. All style parameters used
in this endpoint are the same as the ones available on the normal render_tile endpoint. There
is one additional parameter, "with_background" which determines whether the OSM tiles are
rendered too or not (default is that they are not).
This endpoint will take a bit of time to chunk through the data as the images can get reasonably
large, so beware if you're requesting high z-value layers.
:param z: the z value
:return: a png image
"""
# get the requested style, default to plot if it's missing
style = request.args.get('style', PlotTile.style)
if style not in tile_styles:
raise InvalidStyle(style)
# extract the with background parameter
with_background = extract('with_background',
default=False,
parser=parse_bool)
# the resulting image will be a square with 2^z as the width and height
width = 2**z
image = Image.new('RGBA', (width * 256, width * 256))
# loop through all the tile x, y coordinate pairs
for x, y in itertools.product(range(width), repeat=2):
tile = tile_styles[style](x, y, z)
# query elasticsearch, this will return a list of buckets containing locations and counts
buckets = search(tile, **parameters.extract_search_params())
# extract the parameters for the tile style and request type combination
params = tile_parameters[style]['png']()
# add the osm background tile image if requested
if with_background:
image.paste(get_openstreetmap_tile(x, y, z),
box=[x * 256, y * 256])
# tile.as_image returns the png bytes as it is primarily used for the tile rendering
# endpoint above, therefore we have to reread the png data before pasting it into the main
# layer image. Given that we don't really care about performance in this endpoint, this is
# fine.
tile_image = Image.open(tile.as_image(buckets, **params))
image.paste(tile_image, box=[x * 256, y * 256], mask=tile_image)
# create the response for the image
response = send_file(convert_to_png(image), mimetype='image/png')
# ahhh cors
response.headers['Access-Control-Allow-Origin'] = '*'
return response
def test_extract_param_is_not_present_with_parser(self, monkeypatch):
args = {'test': 5.4}
monkeypatch.setattr('maps.parameters.request', MagicMock(args=args))
assert extract('not_test', default=6.1, parser=int) == 6.1
def test_extract_param_is_present_no_parser(self, monkeypatch):
args = {'test': 5.4}
monkeypatch.setattr('maps.parameters.request', MagicMock(args=args))
assert extract('test', default=None, parser=None) == 5.4