def test07a_polygons(self):
"Testing Polygon objects."
# Testing `from_bbox` class method
bbox = (-180, -90, 180, 90)
p = OGRGeometry.from_bbox(bbox)
self.assertEqual(bbox, p.extent)
prev = OGRGeometry('POINT(0 0)')
for p in self.geometries.polygons:
poly = OGRGeometry(p.wkt)
self.assertEqual(3, poly.geom_type)
self.assertEqual('POLYGON', poly.geom_name)
self.assertEqual(p.n_p, poly.point_count)
self.assertEqual(p.n_i + 1, len(poly))
# Testing area & centroid.
self.assertAlmostEqual(p.area, poly.area, 9)
x, y = poly.centroid.tuple
self.assertAlmostEqual(p.centroid[0], x, 9)
self.assertAlmostEqual(p.centroid[1], y, 9)
# Testing equivalence
self.assertEqual(True, poly == OGRGeometry(p.wkt))
self.assertEqual(True, poly != prev)
if p.ext_ring_cs:
ring = poly[0]
self.assertEqual(p.ext_ring_cs, ring.tuple)
self.assertEqual(p.ext_ring_cs, poly[0].tuple)
self.assertEqual(len(p.ext_ring_cs), ring.point_count)
for r in poly:
self.assertEqual('LINEARRING', r.geom_name)
def test06_spatial_filter(self):
"Testing the Layer.spatial_filter property."
ds = DataSource(get_ds_file('cities', 'shp'))
lyr = ds[0]
# When not set, it should be None.
self.assertEqual(None, lyr.spatial_filter)
# Must be set a/an OGRGeometry or 4-tuple.
self.assertRaises(TypeError, lyr._set_spatial_filter, 'foo')
# Setting the spatial filter with a tuple/list with the extent of
# a buffer centering around Pueblo.
self.assertRaises(ValueError, lyr._set_spatial_filter, range(5))
filter_extent = (-105.609252, 37.255001, -103.609252, 39.255001)
lyr.spatial_filter = (-105.609252, 37.255001, -103.609252, 39.255001)
self.assertEqual(OGRGeometry.from_bbox(filter_extent),
lyr.spatial_filter)
feats = [feat for feat in lyr]
self.assertEqual(1, len(feats))
self.assertEqual('Pueblo', feats[0].get('Name'))
# Setting the spatial filter with an OGRGeometry for buffer centering
# around Houston.
filter_geom = OGRGeometry(
'POLYGON((-96.363151 28.763374,-94.363151 28.763374,-94.363151 30.763374,-96.363151 30.763374,-96.363151 28.763374))'
)
lyr.spatial_filter = filter_geom
self.assertEqual(filter_geom, lyr.spatial_filter)
feats = [feat for feat in lyr]
self.assertEqual(1, len(feats))
self.assertEqual('Houston', feats[0].get('Name'))
# Clearing the spatial filter by setting it to None. Now
# should indicate that there are 3 features in the Layer.
lyr.spatial_filter = None
self.assertEqual(3, len(lyr))