def get_bounding_box(self) -> BoundingBox:
"""Determine bounding box of all items."""
self.fetch_results() # Avoid querying results twice
# Start with an obviously invalid bbox,
# which corrects at the first extend_to_geometry call.
bbox = BoundingBox(math.inf, math.inf, -math.inf, -math.inf)
geometry_field = self.feature_type.resolve_element(
self.feature_type.geometry_field.name).child
for instance in self:
geomery_value = geometry_field.get_value(instance)
if geomery_value is None:
continue
bbox.extend_to_geometry(geomery_value)
return bbox
def get_bounding_box(self) -> Optional[BoundingBox]:
"""Returns a WGS84 BoundingBox for the complete feature.
This is used by the GetCapabilities request. It may return ``None``
when the database table is empty, or the custom queryset doesn't
return any results.
"""
geo_expression = conditional_transform(self.geometry_field.name,
self.geometry_field.srid,
WGS84.srid)
bbox = self.get_queryset().aggregate(a=Extent(geo_expression))["a"]
return BoundingBox(*bbox, crs=WGS84) if bbox else None
def get_envelope(self,
instance,
crs: Optional[CRS] = None) -> Optional[BoundingBox]:
"""Get the bounding box for a single instance.
This is only used for native Python rendering. When the database
rendering is enabled (GISSERVER_USE_DB_RENDERING=True), the calculation
is entirely performed within the query.
"""
geometries = [
geom for geom in (getattr(instance, f.name)
for f in self.geometry_fields)
if geom is not None
]
if not geometries:
return None
# Perform the combining of geometries inside libgeos
geometry = (geometries[0] if len(geometries) == 1 else reduce(
operator.or_, geometries))
if crs is not None and geometry.srid != crs.srid:
crs.apply_to(geometry) # avoid clone
return BoundingBox.from_geometry(geometry, crs=crs)
def test_parse_5(self):
bbox = BoundingBox.from_string("-1,-2,3,4,urn:ogc:def:crs:EPSG::28992")
assert bbox.lower_corner == [-1, -2]
assert bbox.upper_corner == [3, 4]
assert bbox.crs.srid == 28992
def test_parse_4(self):
bbox = BoundingBox.from_string("-1,-2,3,4")
assert bbox.lower_corner == [-1, -2]
assert bbox.upper_corner == [3, 4]
def test_extend(self):
bbox = BoundingBox(1, 2, 3, 4)
bbox.extend_to(-4, -3, -2, -1)
assert bbox.lower_corner == [-4, -3]
assert bbox.upper_corner == [3, 4]