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- import unittest
- import pytest
- from shapely.geometry.polygon import LinearRing, Polygon, orient, signed_area
- class SignedAreaTestCase(unittest.TestCase):
- def test_triangle(self):
- tri = LinearRing([(0, 0), (2, 5), (7, 0)])
- assert signed_area(tri) == pytest.approx(-7 * 5 / 2)
- def test_square(self):
- xmin, xmax = (-1, 1)
- ymin, ymax = (-2, 3)
- rect = LinearRing(
- [(xmin, ymin), (xmax, ymin), (xmax, ymax), (xmin, ymax), (xmin, ymin)]
- )
- assert signed_area(rect) == pytest.approx(10.0)
- class RingOrientationTestCase(unittest.TestCase):
- def test_ccw(self):
- ring = LinearRing([(1, 0), (0, 1), (0, 0)])
- assert ring.is_ccw
- def test_cw(self):
- ring = LinearRing([(0, 0), (0, 1), (1, 0)])
- assert not ring.is_ccw
- class PolygonOrienterTestCase(unittest.TestCase):
- def test_no_holes(self):
- ring = LinearRing([(0, 0), (0, 1), (1, 0)])
- polygon = Polygon(ring)
- assert not polygon.exterior.is_ccw
- polygon = orient(polygon, 1)
- assert polygon.exterior.is_ccw
- def test_holes(self):
- # fmt: off
- polygon = Polygon(
- [(0, 0), (0, 1), (1, 0)],
- [[(0.5, 0.25), (0.25, 0.5), (0.25, 0.25)]]
- )
- # fmt: on
- assert not polygon.exterior.is_ccw
- assert polygon.interiors[0].is_ccw
- polygon = orient(polygon, 1)
- assert polygon.exterior.is_ccw
- assert not polygon.interiors[0].is_ccw
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