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[1.1.X] Fixed #12312 -- Set the coordinate dimension on each component of geometry collections after transform (refines GDAL bug workaround introduced in r11629). Thanks, yourcelf for bug report.

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Backport of r12878 from trunk.


git-svn-id: http://code.djangoproject.com/svn/django/branches/releases/1.1.X@12879 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Justin Bronn 2010-03-29 17:36:25 +00:00
parent e53de431f2
commit ceb5261276
2 changed files with 52 additions and 15 deletions
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22
django/contrib/gis/gdal/geometries.py
View File

@ -48,11 +48,11 @@ from django.contrib.gis.gdal.base import GDALBase
from django.contrib.gis.gdal.envelope import Envelope, OGREnvelope
from django.contrib.gis.gdal.error import OGRException, OGRIndexError, SRSException
from django.contrib.gis.gdal.geomtype import OGRGeomType
from django.contrib.gis.gdal.libgdal import GEOJSON, GDAL_VERSION
from django.contrib.gis.gdal.srs import SpatialReference, CoordTransform
# Getting the ctypes prototype functions that interface w/the GDAL C library.
from django.contrib.gis.gdal.prototypes import geom as capi, srs as srs_api
GEOJSON = capi.GEOJSON
# For more information, see the OGR C API source code:
# http://www.gdal.org/ogr/ogr__api_8h.html
@ -374,7 +374,8 @@ class OGRGeometry(GDALBase):
# afterwards. This is done because of GDAL bug (in versions prior
# to 1.7) that turns geometries 3D after transformation, see:
# http://trac.osgeo.org/gdal/changeset/17792
orig_dim = self.coord_dim
if GDAL_VERSION < (1, 7):
orig_dim = self.coord_dim
# Depending on the input type, use the appropriate OGR routine
# to perform the transformation.
@ -386,11 +387,22 @@ class OGRGeometry(GDALBase):
sr = SpatialReference(coord_trans)
capi.geom_transform_to(self.ptr, sr.ptr)
else:
raise TypeError('Transform only accepts CoordTransform, SpatialReference, string, and integer objects.')
raise TypeError('Transform only accepts CoordTransform, '
'SpatialReference, string, and integer objects.')
# Setting with original dimension, see comment above.
if self.coord_dim != orig_dim:
self.coord_dim = orig_dim
if GDAL_VERSION < (1, 7):
if isinstance(self, GeometryCollection):
# With geometry collections have to set dimension on
# each internal geometry reference, as the collection
# dimension isn't affected.
for i in xrange(len(self)):
internal_ptr = capi.get_geom_ref(self.ptr, i)
if orig_dim != capi.get_coord_dim(internal_ptr):
capi.set_coord_dim(internal_ptr, orig_dim)
else:
if self.coord_dim != orig_dim:
self.coord_dim = orig_dim
def transform_to(self, srs):
"For backwards-compatibility."

25
django/contrib/gis/gdal/tests/test_geom.py
View File

@ -436,6 +436,31 @@ class OGRGeomTest(unittest.TestCase):
self.assertEqual([1.0, 2.0, 3.0], ls_25d.z)
self.assertEqual(3, ls_25d.coord_dim)
def test18_ogrgeometry_transform_workaround(self):
"Testing coordinate dimensions on geometries after transformation."
# A bug in GDAL versions prior to 1.7 changes the coordinate
# dimension of a geometry after it has been transformed.
# This test ensures that the bug workarounds employed within
# `OGRGeometry.transform` indeed work.
wkt_2d = "MULTILINESTRING ((0 0,1 1,2 2))"
wkt_3d = "MULTILINESTRING ((0 0 0,1 1 1,2 2 2))"
srid = 4326
# For both the 2D and 3D MultiLineString, ensure _both_ the dimension
# of the collection and the component LineString have the expected
# coordinate dimension after transform.
geom = OGRGeometry(wkt_2d, srid)
geom.transform(srid)
self.assertEqual(2, geom.coord_dim)
self.assertEqual(2, geom[0].coord_dim)
self.assertEqual(wkt_2d, geom.wkt)
geom = OGRGeometry(wkt_3d, srid)
geom.transform(srid)
self.assertEqual(3, geom.coord_dim)
self.assertEqual(3, geom[0].coord_dim)
self.assertEqual(wkt_3d, geom.wkt)
def suite():
s = unittest.TestSuite()
s.addTest(unittest.makeSuite(OGRGeomTest))