def test01_srid(self):
"Testing GeometryField with a SRID set."
# Input that doesn't specify the SRID is assumed to be in the SRID
# of the input field.
fld = forms.GeometryField(srid=4326)
geom = fld.clean('POINT(5 23)')
self.assertEqual(4326, geom.srid)
# Making the field in a different SRID from that of the geometry, and
# asserting it transforms.
fld = forms.GeometryField(srid=32140)
tol = 0.0000001
xform_geom = GEOSGeometry('POINT (951640.547328465 4219369.26171664)', srid=32140)
# The cleaned geometry should be transformed to 32140.
cleaned_geom = fld.clean('SRID=4326;POINT (-95.363151 29.763374)')
self.assertTrue(xform_geom.equals_exact(cleaned_geom, tol))
def _has_changed(self, initial, data):
""" Compare geographic value of data with its initial value. """
# Ensure we are dealing with a geographic object
if isinstance(initial, six.string_types):
try:
initial = GEOSGeometry(initial)
except (GEOSException, ValueError):
initial = None
# Only do a geographic comparison if both values are available
if initial and data:
data = fromstr(data)
data.transform(initial.srid)
# If the initial value was not added by the browser, the geometry
# provided may be slightly different, the first time it is saved.
# The comparison is done with a very low tolerance.
return not initial.equals_exact(data, tolerance=0.000001)
else:
# Check for change of state of existence
return bool(initial) != bool(data)