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- import unittest
- import pytest
- from shapely.geometry import LinearRing, LineString
- from shapely.testing import assert_geometries_equal
- @pytest.mark.parametrize("distance", [float("nan"), float("inf")])
- def test_non_finite_distance(distance):
- g = LineString([(0, 0), (10, 0)])
- with pytest.raises(ValueError, match="distance must be finite"):
- g.parallel_offset(distance)
- class OperationsTestCase(unittest.TestCase):
- def test_parallel_offset_linestring(self):
- line1 = LineString([(0, 0), (10, 0)])
- left = line1.parallel_offset(5, "left")
- assert_geometries_equal(left, LineString([(0, 5), (10, 5)]))
- right = line1.parallel_offset(5, "right")
- assert_geometries_equal(right, LineString([(10, -5), (0, -5)]), normalize=True)
- right = line1.parallel_offset(-5, "left")
- assert_geometries_equal(right, LineString([(10, -5), (0, -5)]), normalize=True)
- left = line1.parallel_offset(-5, "right")
- assert_geometries_equal(left, LineString([(0, 5), (10, 5)]))
- # by default, parallel_offset is right-handed
- assert_geometries_equal(line1.parallel_offset(5), right)
- line2 = LineString([(0, 0), (5, 0), (5, -5)])
- assert_geometries_equal(
- line2.parallel_offset(2, "left", join_style=3),
- LineString([(0, 2), (5, 2), (7, 0), (7, -5)]),
- )
- assert_geometries_equal(
- line2.parallel_offset(2, "left", join_style=2),
- LineString([(0, 2), (7, 2), (7, -5)]),
- )
- # offset_curve alias
- assert_geometries_equal(
- line1.offset_curve(2, quad_segs=10),
- line1.parallel_offset(2, "left", resolution=10),
- )
- assert_geometries_equal(
- line1.offset_curve(-2, join_style="mitre"),
- line1.parallel_offset(2, "right", join_style=2),
- )
- def test_parallel_offset_linear_ring(self):
- lr1 = LinearRing([(0, 0), (5, 0), (5, 5), (0, 5), (0, 0)])
- assert_geometries_equal(
- lr1.parallel_offset(2, "left", resolution=1),
- LineString([(2, 2), (3, 2), (3, 3), (2, 3), (2, 2)]),
- )
- # offset_curve alias
- assert_geometries_equal(
- lr1.offset_curve(2, quad_segs=1),
- lr1.parallel_offset(2, "left", resolution=1),
- )
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