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Fixed #17736 -- Kept maximal floating-point accuracy in from_bbox

When constructing a polygon with Polygon.from_bbox, do not convert
parameters to strings at this stage (str defaults to 12 significant
Thanks for the report and David Eklung for the patch.
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1 parent fedac99 commit 17824e2b74ca02b9914e853c818fa512a0f9ef34 @claudep claudep committed
1  AUTHORS
@@ -171,6 +171,7 @@ answer newbie questions, and generally made Django that much better:
Clint Ecker
Nick Efford <>
+ David Eklund
Julia Elman
Enrico <>
7 django/contrib/gis/geos/
@@ -55,8 +55,11 @@ def __len__(self):
def from_bbox(cls, bbox):
"Constructs a Polygon from a bounding box (4-tuple)."
x0, y0, x1, y1 = bbox
- return GEOSGeometry( 'POLYGON((%s %s, %s %s, %s %s, %s %s, %s %s))' % (
- x0, y0, x0, y1, x1, y1, x1, y0, x0, y0) )
+ for z in bbox:
+ if not isinstance(z, (int, long, float)):
+ return GEOSGeometry('POLYGON((%s %s, %s %s, %s %s, %s %s, %s %s))' %
+ (x0, y0, x0, y1, x1, y1, x1, y0, x0, y0))
+ return Polygon(((x0, y0), (x0, y1), (x1, y1), (x1, y0), (x0, y0)))
### These routines are needed for list-like operation w/ListMixin ###
def _create_polygon(self, length, items):
7 django/contrib/gis/geos/tests/
@@ -384,6 +384,13 @@ def test_polygons_from_bbox(self):
p = Polygon.from_bbox(bbox)
self.assertEqual(bbox, p.extent)
+ # Testing numerical precision
+ x = 3.14159265358979323
+ bbox = (0, 0, 1, x)
+ p = Polygon.from_bbox(bbox)
+ y = p.extent[-1]
+ self.assertEqual(format(x, '.13f'), format(y, '.13f'))
def test_polygons(self):
"Testing Polygon objects."

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