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Improved testing of num_seg kwarg of BoundingCircle GIS function.

This commit is contained in:
Sergey Fedoseev 2016-12-15 22:15:08 +05:00 committed by Tim Graham
parent bf84d042e0
commit d013134ffb
1 changed files with 9 additions and 0 deletions
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9
tests/gis_tests/geoapp/test_functions.py
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@ -147,16 +147,25 @@ class GISFunctionsTests(TestCase):
@skipUnlessDBFeature("has_BoundingCircle_function") @skipUnlessDBFeature("has_BoundingCircle_function")
def test_bounding_circle(self): def test_bounding_circle(self):
def circle_num_points(num_seg):
# num_seg is the number of segments per quarter circle.
return (4 * num_seg) + 1
# The weak precision in the assertions is because the BoundingCircle # The weak precision in the assertions is because the BoundingCircle
# calculation changed on PostGIS 2.3. # calculation changed on PostGIS 2.3.
qs = Country.objects.annotate(circle=functions.BoundingCircle('mpoly')).order_by('name') qs = Country.objects.annotate(circle=functions.BoundingCircle('mpoly')).order_by('name')
self.assertAlmostEqual(qs[0].circle.area, 169, 0) self.assertAlmostEqual(qs[0].circle.area, 169, 0)
self.assertAlmostEqual(qs[1].circle.area, 136, 0) self.assertAlmostEqual(qs[1].circle.area, 136, 0)
# By default num_seg=48.
self.assertEqual(qs[0].circle.num_points, circle_num_points(48))
self.assertEqual(qs[1].circle.num_points, circle_num_points(48))
qs = Country.objects.annotate(circle=functions.BoundingCircle('mpoly', num_seg=12)).order_by('name') qs = Country.objects.annotate(circle=functions.BoundingCircle('mpoly', num_seg=12)).order_by('name')
self.assertGreater(qs[0].circle.area, 168.4, 0) self.assertGreater(qs[0].circle.area, 168.4, 0)
self.assertLess(qs[0].circle.area, 169.5, 0) self.assertLess(qs[0].circle.area, 169.5, 0)
self.assertAlmostEqual(qs[1].circle.area, 136, 0) self.assertAlmostEqual(qs[1].circle.area, 136, 0)
self.assertEqual(qs[0].circle.num_points, circle_num_points(12))
self.assertEqual(qs[1].circle.num_points, circle_num_points(12))
@skipUnlessDBFeature("has_Centroid_function") @skipUnlessDBFeature("has_Centroid_function")
def test_centroid(self): def test_centroid(self):