def _get_shape(self, value):
points = json.loads(value)
# close ring and create Polygon
polygon = Polygon(points+[points[0]])
polygon.srid = SRID_WSG84
polygon.transform(SRID_RD)
return polygon
def get_queryset(self):
"""
Inspired by Glen Roberton's django-geojson-tiles view
"""
self.z, self.x, self.y = self._parse_args()
nw = self.tile_coord(self.x, self.y, self.z)
se = self.tile_coord(self.x + 1, self.y + 1, self.z)
bbox = Polygon((nw, (se[0], nw[1]), se, (nw[0], se[1]), nw))
bbox.srid = self.srid
qs = super(TiledGeoJSONLayerView, self).get_queryset()
qs = qs.filter(**{'%s__intersects' % self.geometry_field: bbox})
self.bbox = bbox.extent
# Simplification dict by zoom level
simplifications = self.simplifications or {}
z = self.z
self.simplify = simplifications.get(z)
while self.simplify is None and z < 32:
z += 1
self.simplify = simplifications.get(z)
# Won't trim point geometries to a boundary
model_field = qs.model._meta.get_field(self.geometry_field)
self.trim_to_boundary = (self.trim_to_boundary
and not isinstance(model_field, PointField)
and Intersection is not None)
if self.trim_to_boundary:
if django.VERSION < (1, 9):
qs = qs.intersection(bbox)
else:
qs = qs.annotate(
intersection=Intersection(self.geometry_field, bbox))
self.geometry_field = 'intersection'
return qs
def dict2poly(arr):
if arr:
if arr[-1] != arr[0]:
arr.append(arr[0])
poly = Polygon(arr)
poly.srid = 4326
return poly
else:
return None
