First Commit

2026-05-31 10:17:09 +07:00
commit 17a9c69379
4547 changed files with 1170384 additions and 0 deletions
@@ -0,0 +1,60 @@
+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),
+        )