structure saas with tools

.venv/lib/python3.10/site-packages/shapely/tests/legacy/test_cga.py

@@ -0,0 +1,51 @@
+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