def test04_wkbwriter(self):
wkb_w = WKBWriter()
# Representations of 'POINT (5 23)' in hex -- one normal and
# the other with the byte order changed.
g = GEOSGeometry("POINT (5 23)")
hex1 = b"010100000000000000000014400000000000003740"
wkb1 = memoryview(binascii.a2b_hex(hex1))
hex2 = b"000000000140140000000000004037000000000000"
wkb2 = memoryview(binascii.a2b_hex(hex2))
self.assertEqual(hex1, wkb_w.write_hex(g))
self.assertEqual(wkb1, wkb_w.write(g))
# Ensuring bad byteorders are not accepted.
for bad_byteorder in (-1, 2, 523, "foo", None):
# Equivalent of `wkb_w.byteorder = bad_byteorder`
with self.assertRaises(ValueError):
wkb_w._set_byteorder(bad_byteorder)
# Setting the byteorder to 0 (for Big Endian)
wkb_w.byteorder = 0
self.assertEqual(hex2, wkb_w.write_hex(g))
self.assertEqual(wkb2, wkb_w.write(g))
# Back to Little Endian
wkb_w.byteorder = 1
# Now, trying out the 3D and SRID flags.
g = GEOSGeometry("POINT (5 23 17)")
g.srid = 4326
hex3d = b"0101000080000000000000144000000000000037400000000000003140"
wkb3d = memoryview(binascii.a2b_hex(hex3d))
hex3d_srid = (
b"01010000A0E6100000000000000000144000000000000037400000000000003140"
)
wkb3d_srid = memoryview(binascii.a2b_hex(hex3d_srid))
# Ensuring bad output dimensions are not accepted
for bad_outdim in (-1, 0, 1, 4, 423, "foo", None):
with self.assertRaisesMessage(
ValueError, "WKB output dimension must be 2 or 3"):
wkb_w.outdim = bad_outdim
# Now setting the output dimensions to be 3
wkb_w.outdim = 3
self.assertEqual(hex3d, wkb_w.write_hex(g))
self.assertEqual(wkb3d, wkb_w.write(g))
# Telling the WKBWriter to include the srid in the representation.
wkb_w.srid = True
self.assertEqual(hex3d_srid, wkb_w.write_hex(g))
self.assertEqual(wkb3d_srid, wkb_w.write(g))
def test04_wkbwriter(self):
wkb_w = WKBWriter()
# Representations of 'POINT (5 23)' in hex -- one normal and
# the other with the byte order changed.
g = GEOSGeometry('POINT (5 23)')
hex1 = '010100000000000000000014400000000000003740'
wkb1 = buffer(binascii.a2b_hex(hex1))
hex2 = '000000000140140000000000004037000000000000'
wkb2 = buffer(binascii.a2b_hex(hex2))
self.assertEqual(hex1, wkb_w.write_hex(g))
self.assertEqual(wkb1, wkb_w.write(g))
# Ensuring bad byteorders are not accepted.
for bad_byteorder in (-1, 2, 523, 'foo', None):
# Equivalent of `wkb_w.byteorder = bad_byteorder`
self.assertRaises(ValueError, wkb_w._set_byteorder, bad_byteorder)
# Setting the byteorder to 0 (for Big Endian)
wkb_w.byteorder = 0
self.assertEqual(hex2, wkb_w.write_hex(g))
self.assertEqual(wkb2, wkb_w.write(g))
# Back to Little Endian
wkb_w.byteorder = 1
# Now, trying out the 3D and SRID flags.
g = GEOSGeometry('POINT (5 23 17)')
g.srid = 4326
hex3d = '0101000080000000000000144000000000000037400000000000003140'
wkb3d = buffer(binascii.a2b_hex(hex3d))
hex3d_srid = '01010000A0E6100000000000000000144000000000000037400000000000003140'
wkb3d_srid = buffer(binascii.a2b_hex(hex3d_srid))
# Ensuring bad output dimensions are not accepted
for bad_outdim in (-1, 0, 1, 4, 423, 'foo', None):
# Equivalent of `wkb_w.outdim = bad_outdim`
self.assertRaises(ValueError, wkb_w._set_outdim, bad_outdim)
# These tests will fail on 3.0.0 because of a bug that was fixed in 3.1:
# http://trac.osgeo.org/geos/ticket/216
if not geos_version_info()['version'].startswith('3.0.'):
# Now setting the output dimensions to be 3
wkb_w.outdim = 3
self.assertEqual(hex3d, wkb_w.write_hex(g))
self.assertEqual(wkb3d, wkb_w.write(g))
# Telling the WKBWriter to inlcude the srid in the representation.
wkb_w.srid = True
self.assertEqual(hex3d_srid, wkb_w.write_hex(g))
self.assertEqual(wkb3d_srid, wkb_w.write(g))
def test04_wkbwriter(self):
wkb_w = WKBWriter()
# Representations of 'POINT (5 23)' in hex -- one normal and
# the other with the byte order changed.
g = GEOSGeometry('POINT (5 23)')
hex1 = b'010100000000000000000014400000000000003740'
wkb1 = memoryview(binascii.a2b_hex(hex1))
hex2 = b'000000000140140000000000004037000000000000'
wkb2 = memoryview(binascii.a2b_hex(hex2))
self.assertEqual(hex1, wkb_w.write_hex(g))
self.assertEqual(wkb1, wkb_w.write(g))
# Ensuring bad byteorders are not accepted.
for bad_byteorder in (-1, 2, 523, 'foo', None):
# Equivalent of `wkb_w.byteorder = bad_byteorder`
self.assertRaises(ValueError, wkb_w._set_byteorder, bad_byteorder)
# Setting the byteorder to 0 (for Big Endian)
wkb_w.byteorder = 0
self.assertEqual(hex2, wkb_w.write_hex(g))
self.assertEqual(wkb2, wkb_w.write(g))
# Back to Little Endian
wkb_w.byteorder = 1
# Now, trying out the 3D and SRID flags.
g = GEOSGeometry('POINT (5 23 17)')
g.srid = 4326
hex3d = b'0101000080000000000000144000000000000037400000000000003140'
wkb3d = memoryview(binascii.a2b_hex(hex3d))
hex3d_srid = b'01010000A0E6100000000000000000144000000000000037400000000000003140'
wkb3d_srid = memoryview(binascii.a2b_hex(hex3d_srid))
# Ensuring bad output dimensions are not accepted
for bad_outdim in (-1, 0, 1, 4, 423, 'foo', None):
# Equivalent of `wkb_w.outdim = bad_outdim`
self.assertRaises(ValueError, wkb_w._set_outdim, bad_outdim)
# These tests will fail on 3.0.0 because of a bug that was fixed in 3.1:
# http://trac.osgeo.org/geos/ticket/216
if not geos_version_info()['version'].startswith('3.0.'):
# Now setting the output dimensions to be 3
wkb_w.outdim = 3
self.assertEqual(hex3d, wkb_w.write_hex(g))
self.assertEqual(wkb3d, wkb_w.write(g))
# Telling the WKBWriter to include the srid in the representation.
wkb_w.srid = True
self.assertEqual(hex3d_srid, wkb_w.write_hex(g))
self.assertEqual(wkb3d_srid, wkb_w.write(g))
def test04_wkbwriter(self):
wkb_w = WKBWriter()
# Representations of 'POINT (5 23)' in hex -- one normal and
# the other with the byte order changed.
g = GEOSGeometry('POINT (5 23)')
hex1 = b'010100000000000000000014400000000000003740'
wkb1 = memoryview(binascii.a2b_hex(hex1))
hex2 = b'000000000140140000000000004037000000000000'
wkb2 = memoryview(binascii.a2b_hex(hex2))
self.assertEqual(hex1, wkb_w.write_hex(g))
self.assertEqual(wkb1, wkb_w.write(g))
# Ensuring bad byteorders are not accepted.
for bad_byteorder in (-1, 2, 523, 'foo', None):
# Equivalent of `wkb_w.byteorder = bad_byteorder`
with self.assertRaises(ValueError):
wkb_w._set_byteorder(bad_byteorder)
# Setting the byteorder to 0 (for Big Endian)
wkb_w.byteorder = 0
self.assertEqual(hex2, wkb_w.write_hex(g))
self.assertEqual(wkb2, wkb_w.write(g))
# Back to Little Endian
wkb_w.byteorder = 1
# Now, trying out the 3D and SRID flags.
g = GEOSGeometry('POINT (5 23 17)')
g.srid = 4326
hex3d = b'0101000080000000000000144000000000000037400000000000003140'
wkb3d = memoryview(binascii.a2b_hex(hex3d))
hex3d_srid = b'01010000A0E6100000000000000000144000000000000037400000000000003140'
wkb3d_srid = memoryview(binascii.a2b_hex(hex3d_srid))
# Ensuring bad output dimensions are not accepted
for bad_outdim in (-1, 0, 1, 4, 423, 'foo', None):
# Equivalent of `wkb_w.outdim = bad_outdim`
with self.assertRaises(ValueError):
wkb_w._set_outdim(bad_outdim)
# Now setting the output dimensions to be 3
wkb_w.outdim = 3
self.assertEqual(hex3d, wkb_w.write_hex(g))
self.assertEqual(wkb3d, wkb_w.write(g))
# Telling the WKBWriter to include the srid in the representation.
wkb_w.srid = True
self.assertEqual(hex3d_srid, wkb_w.write_hex(g))
self.assertEqual(wkb3d_srid, wkb_w.write(g))
def test_empty_polygon_wkb(self):
p = Polygon(srid=4326)
p_no_srid = Polygon()
wkb_w = WKBWriter()
wkb_w.srid = True
for byteorder, hexes in enumerate([
(b'000000000300000000', b'0020000003000010E600000000'),
(b'010300000000000000', b'0103000020E610000000000000'),
]):
wkb_w.byteorder = byteorder
for srid, hex in enumerate(hexes):
wkb_w.srid = srid
self.assertEqual(wkb_w.write_hex(p), hex)
self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p if srid else p_no_srid)
self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex)))
self.assertEqual(GEOSGeometry(wkb_w.write(p)), p if srid else p_no_srid)
def convert_to_2d(geom):
"""Convert a geometry from 3D to 2D"""
from django.contrib.gis.geos import WKBWriter, WKBReader
wkb_r = WKBReader()
wkb_w = WKBWriter()
wkb_w.outdim = 2
return wkb_r.read(wkb_w.write(geom))
def convert_to_2d(geom):
"""Convert a geometry from 3D to 2D"""
from django.contrib.gis.geos import WKBWriter, WKBReader
wkb_r = WKBReader()
wkb_w = WKBWriter()
wkb_w.outdim = 2
return wkb_r.read(wkb_w.write(geom))
def test_empty_polygon_wkb(self):
p = Polygon(srid=4326)
p_no_srid = Polygon()
wkb_w = WKBWriter()
wkb_w.srid = True
for byteorder, hexes in enumerate([
(b'000000000300000000', b'0020000003000010E600000000'),
(b'010300000000000000', b'0103000020E610000000000000'),
]):
wkb_w.byteorder = byteorder
for srid, hex in enumerate(hexes):
wkb_w.srid = srid
self.assertEqual(wkb_w.write_hex(p), hex)
self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p if srid else p_no_srid)
self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex)))
self.assertEqual(GEOSGeometry(wkb_w.write(p)), p if srid else p_no_srid)
def test_empty_point_wkb(self):
p = Point(srid=4326)
wkb_w = WKBWriter()
wkb_w.srid = False
with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'):
wkb_w.write(p)
with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'):
wkb_w.write_hex(p)
wkb_w.srid = True
for byteorder, hex in enumerate([
b'0020000001000010E67FF80000000000007FF8000000000000',
b'0101000020E6100000000000000000F87F000000000000F87F',
]):
wkb_w.byteorder = byteorder
self.assertEqual(wkb_w.write_hex(p), hex)
self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p)
self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex)))
self.assertEqual(GEOSGeometry(wkb_w.write(p)), p)
def test_empty_point_wkb(self):
p = Point(srid=4326)
wkb_w = WKBWriter()
wkb_w.srid = False
with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'):
wkb_w.write(p)
with self.assertRaisesMessage(ValueError, 'Empty point is not representable in WKB.'):
wkb_w.write_hex(p)
wkb_w.srid = True
for byteorder, hex in enumerate([
b'0020000001000010E67FF80000000000007FF8000000000000',
b'0101000020E6100000000000000000F87F000000000000F87F',
]):
wkb_w.byteorder = byteorder
self.assertEqual(wkb_w.write_hex(p), hex)
self.assertEqual(GEOSGeometry(wkb_w.write_hex(p)), p)
self.assertEqual(wkb_w.write(p), memoryview(binascii.a2b_hex(hex)))
self.assertEqual(GEOSGeometry(wkb_w.write(p)), p)
def prepare_geometry(self, field, value):
"""
Reduce geometry to two dimensions if GeometryField's
dim parameter is not set otherwise.
"""
from django.contrib.gis.geos import WKBWriter, GEOSGeometry
if isinstance(value, (str, text_type)):
value = GEOSGeometry(value)
wkb_writer = WKBWriter()
if isinstance(value, GEOSGeometry):
if value.hasz and field.dim == 2:
value = GEOSGeometry(wkb_writer.write(value))
return value
def prepare_geometry(self, field, value):
"""
Reduce geometry to two dimensions if GeometryField's
dim parameter is not set otherwise.
"""
from django.contrib.gis.geos import WKBWriter, GEOSGeometry
if isinstance(value, (str, text_type)):
value = GEOSGeometry(value)
wkb_writer = WKBWriter()
if isinstance(value, GEOSGeometry):
if value.hasz and field.dim == 2:
value = GEOSGeometry(wkb_writer.write(value))
return value
def _handle_geom(self, geometry):
""" Geometry processing (in place), depending on options """
# Optional force 2D
if self.options.get('force2d'):
wkb_w = WKBWriter()
wkb_w.outdim = 2
geometry = GEOSGeometry(wkb_w.write(geometry), srid=geometry.srid)
# Optional geometry simplification
simplify = self.options.get('simplify')
if simplify is not None:
geometry = geometry.simplify(tolerance=simplify, preserve_topology=True)
# Optional geometry reprojection
if self.srid != geometry.srid:
geometry.transform(self.srid)
return geometry
def _handle_geom(self, geometry):
""" Geometry processing (in place), depending on options """
# Optional force 2D
if self.options.get('force2d'):
wkb_w = WKBWriter()
wkb_w.outdim = 2
geometry = GEOSGeometry(wkb_w.write(geometry), srid=geometry.srid)
# Optional geometry simplification
simplify = self.options.get('simplify')
if simplify is not None:
geometry = geometry.simplify(tolerance=simplify,
preserve_topology=True)
# Optional geometry reprojection
if self.srid != geometry.srid:
geometry.transform(self.srid)
return geometry
def _prepare_geometry(self, field, value):
"""
Reduce geometry to two dimensions if models.GeometryField
dim parameter does not request otherwise.
"""
# TODO: DO we need to add 2D to 3D conversation filling z
# with 0s or is this taken care of implicitely?
# (cannot be easily tested since 3d is not supported by
# spatialite backend in Django 1.6.)
from django.contrib.gis.geos import WKBWriter, GEOSGeometry
if isinstance(value, (str, unicode)):
value = GEOSGeometry(value)
wkb_writer = WKBWriter()
if isinstance(value, GEOSGeometry):
if value.hasz and field.dim == 2:
value = GEOSGeometry(wkb_writer.write(value))
return value
def _handle_geom(self, value):
""" Geometry processing (in place), depending on options """
if value is None:
geometry = None
elif isinstance(value, dict) and 'type' in value:
geometry = value
else:
if isinstance(value, GEOSGeometry):
geometry = value
else:
try:
# this will handle string representations (e.g. ewkt, bwkt)
geometry = GEOSGeometry(value)
except ValueError:
# if the geometry couldn't be parsed.
# we can't generate valid geojson
error_msg = 'The field ["%s", "%s"] could not be parsed as a valid geometry' % (
self.geometry_field, value)
raise SerializationError(error_msg)
# Optional force 2D
if self.options.get('force2d'):
wkb_w = WKBWriter()
wkb_w.outdim = 2
geometry = GEOSGeometry(wkb_w.write(geometry),
srid=geometry.srid)
# Optional geometry simplification
simplify = self.options.get('simplify')
if simplify is not None:
geometry = geometry.simplify(tolerance=simplify,
preserve_topology=True)
# Optional geometry reprojection
if geometry.srid and geometry.srid != self.srid:
geometry.transform(self.srid)
# Optional bbox
if self.options.get('bbox_auto'):
self._current['bbox'] = geometry.extent
self._current['geometry'] = geometry
def _handle_geom(self, value):
""" Geometry processing (in place), depending on options """
if value is None:
geometry = None
elif isinstance(value, dict) and 'type' in value:
geometry = value
else:
if isinstance(value, GEOSGeometry):
geometry = value
else:
try:
# this will handle string representations (e.g. ewkt, bwkt)
geometry = GEOSGeometry(value)
except ValueError:
# if the geometry couldn't be parsed.
# we can't generate valid geojson
error_msg = 'The field ["%s", "%s"] could not be parsed as a valid geometry' % (
self.geometry_field, value
)
raise SerializationError(error_msg)
# Optional force 2D
if self.options.get('force2d'):
wkb_w = WKBWriter()
wkb_w.outdim = 2
geometry = GEOSGeometry(wkb_w.write(geometry), srid=geometry.srid)
# Optional geometry simplification
simplify = self.options.get('simplify')
if simplify is not None:
geometry = geometry.simplify(tolerance=simplify, preserve_topology=True)
# Optional geometry reprojection
if geometry.srid and geometry.srid != self.srid:
geometry.transform(self.srid)
# Optional bbox
if self.options.get('bbox_auto'):
self._current['bbox'] = geometry.extent
self._current['geometry'] = geometry
