def test_translate(self):
xfac, yfac = 5, -23
qs = Country.objects.annotate(translated=functions.Translate('mpoly', xfac, yfac))
for c in qs:
for p1, p2 in zip(c.mpoly, c.translated):
for r1, r2 in zip(p1, p2):
for c1, c2 in zip(r1.coords, r2.coords):
# The low precision is for SpatiaLite
self.assertAlmostEqual(c1[0] + xfac, c2[0], 5)
self.assertAlmostEqual(c1[1] + yfac, c2[1], 5)
def test_update_with_expression(self):
city = City.objects.create(point=Point(1, 1, srid=4326))
City.objects.filter(pk=city.pk).update(point=functions.Translate("point", 1, 1))
city.refresh_from_db()
self.assertEqual(city.point, Point(2, 2, srid=4326))
def _trans_scale(self, colname, deltax, deltay, xfactor, yfactor):
if connection.ops.spatialite:
return geofn.Scale(geofn.Translate(colname, deltax, deltay),
xfactor, yfactor)
else:
return TransScale(colname, deltax, deltay, xfactor, yfactor)
