def test_simplify_geojson(self):
fn = functions.AsGeoJSON(query.Simplify(
functions.Transform('geom', self.srid), self.tol),
precision=2)
sqs = self.qs.all().annotate(geojson=fn)
geom = geos.GEOSGeometry(sqs[0].geojson, self.srid)
source = self.qs[0].geom
self.assertNotEqual(geom, source)
self.assertNotEqual(geom.srid, source.srid)
self.assertLess(geom.num_coords, source.num_coords)
def test_serialize_queryset_simplify(self):
fn = query.Simplify(functions.Transform('geom', 4269), 1.01)
qs = Location.objects.all()
for obj in qs:
obj.geom = obj.geom.buffer(1.5)
obj.save()
qs = qs.annotate(simplify=fn)
obj = qs[0]
serializer = SimplifyLocationSerializer(obj)
g = geos.GEOSGeometry(json.dumps(serializer.data['geometry']),
srid=obj.simplify.srid)
self.assertEqual(g, obj.simplify)
self.assertEqual(obj.simplify.srid, 4269)
self.assertEqual(serializer.data['crs']['properties']['name'][-4:], '4269')
def select(self):
kwargs = {}
data = self.cleaned_data
tolerance, srs, format = map(data.get, ('simplify', 'srs', 'format'))
expr = field = query.geo_field(self.queryset).name
srid = getattr(srs, 'srid', None)
if srid:
expr = functions.Transform(expr, srid)
if data['op']:
expr = data['op'](expr)
if data['precision'] is not None:
kwargs.update(precision=data['precision'])
if tolerance:
expr = query.Simplify(expr, tolerance)
if format:
expr = format(expr, **kwargs)
if expr != field:
attrname = self.data.get('format')
self.queryset = self.queryset.annotate(**{attrname: expr})
def test_simplify_kml(self):
fn = functions.AsKML(query.Simplify('geom', self.radius))
sqs = self.qs.all().annotate(kml=fn)
self.assertTrue(sqs[0].kml.startswith('<Polygon>'))
self.assertNotIn('<coordinates></coordinates>', sqs[0].kml)
self.assertXMLNotEqual(sqs[0].kml, self.qs[0].geom.kml)