import numpy as np
import pytest
from shapely.geometry import Point, Polygon
from shapely.prepared import PreparedGeometry, prep
def test_prepared_geometry():
polygon = Polygon([(0, 0), (1, 0), (1, 1), (0, 1)])
p = PreparedGeometry(polygon)
assert p.contains(Point(0.5, 0.5))
assert not p.contains(Point(0.5, 1.5))
def test_prep():
polygon = Polygon([(0, 0), (1, 0), (1, 1), (0, 1)])
p = prep(polygon)
assert p.contains(Point(0.5, 0.5))
assert not p.contains(Point(0.5, 1.5))
def test_op_not_allowed():
p = PreparedGeometry(Point(0.0, 0.0).buffer(1.0))
with pytest.raises(TypeError):
Point(0.0, 0.0).union(p)
def test_predicate_not_allowed():
p = PreparedGeometry(Point(0.0, 0.0).buffer(1.0))
with pytest.raises(TypeError):
Point(0.0, 0.0).contains(p)
def test_prepared_predicates():
# check prepared predicates give the same result as regular predicates
polygon1 = Polygon([(0, 0), (0, 1), (1, 1), (1, 0), (0, 0)])
polygon2 = Polygon([(0.5, 0.5), (1.5, 0.5), (1.0, 1.0), (0.5, 0.5)])
point2 = Point(0.5, 0.5)
polygon_empty = Polygon()
prepared_polygon1 = PreparedGeometry(polygon1)
for geom2 in (polygon2, point2, polygon_empty):
with np.errstate(invalid="ignore"):
assert polygon1.disjoint(geom2) == prepared_polygon1.disjoint(geom2)
assert polygon1.touches(geom2) == prepared_polygon1.touches(geom2)
assert polygon1.intersects(geom2) == prepared_polygon1.intersects(geom2)
assert polygon1.crosses(geom2) == prepared_polygon1.crosses(geom2)
assert polygon1.within(geom2) == prepared_polygon1.within(geom2)
assert polygon1.contains(geom2) == prepared_polygon1.contains(geom2)
assert polygon1.contains_properly(
geom2
) == prepared_polygon1.contains_properly(geom2)
assert polygon1.overlaps(geom2) == prepared_polygon1.overlaps(geom2)
def test_prepare_already_prepared():
polygon = Polygon([(0, 0), (1, 0), (1, 1), (0, 1)])
prepared = prep(polygon)
# attempt to prepare an already prepared geometry with `prep`
result = prep(prepared)
assert isinstance(result, PreparedGeometry)
assert result.context is polygon
# attempt to prepare an already prepared geometry with `PreparedGeometry`
result = PreparedGeometry(prepared)
assert isinstance(result, PreparedGeometry)
assert result.context is polygon