initial commit

billinglayer/python/shapely/tests/geometry/test_coords.py

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+import numpy as np
+import pytest
+
+from shapely import LineString
+
+
+class TestCoords:
+    """
+    Shapely assumes contiguous C-order float64 data for internal ops.
+    Data should be converted to contiguous float64 if numpy exists.
+    c9a0707 broke this a little bit.
+    """
+
+    def test_data_promotion(self):
+        coords = np.array([[12, 34], [56, 78]], dtype=np.float32)
+        processed_coords = np.array(LineString(coords).coords)
+
+        assert coords.tolist() == processed_coords.tolist()
+
+    def test_data_destriding(self):
+        coords = np.array([[12, 34], [56, 78]], dtype=np.float32)
+
+        # Easy way to introduce striding: reverse list order
+        processed_coords = np.array(LineString(coords[::-1]).coords)
+
+        assert coords[::-1].tolist() == processed_coords.tolist()
+
+
+class TestCoordsGetItem:
+    def test_index_2d_coords(self):
+        c = [(float(x), float(-x)) for x in range(4)]
+        g = LineString(c)
+        for i in range(-4, 4):
+            assert g.coords[i] == c[i]
+        with pytest.raises(IndexError):
+            g.coords[4]
+        with pytest.raises(IndexError):
+            g.coords[-5]
+
+    def test_index_3d_coords(self):
+        c = [(float(x), float(-x), float(x * 2)) for x in range(4)]
+        g = LineString(c)
+        for i in range(-4, 4):
+            assert g.coords[i] == c[i]
+        with pytest.raises(IndexError):
+            g.coords[4]
+        with pytest.raises(IndexError):
+            g.coords[-5]
+
+    def test_index_coords_misc(self):
+        g = LineString()  # empty
+        with pytest.raises(IndexError):
+            g.coords[0]
+        with pytest.raises(TypeError):
+            g.coords[0.0]
+
+    def test_slice_2d_coords(self):
+        c = [(float(x), float(-x)) for x in range(4)]
+        g = LineString(c)
+        assert g.coords[1:] == c[1:]
+        assert g.coords[:-1] == c[:-1]
+        assert g.coords[::-1] == c[::-1]
+        assert g.coords[::2] == c[::2]
+        assert g.coords[:4] == c[:4]
+        assert g.coords[4:] == c[4:] == []
+
+    def test_slice_3d_coords(self):
+        c = [(float(x), float(-x), float(x * 2)) for x in range(4)]
+        g = LineString(c)
+        assert g.coords[1:] == c[1:]
+        assert g.coords[:-1] == c[:-1]
+        assert g.coords[::-1] == c[::-1]
+        assert g.coords[::2] == c[::2]
+        assert g.coords[:4] == c[:4]
+        assert g.coords[4:] == c[4:] == []
+
+
+class TestXY:
+    """New geometry/coordseq method 'xy' makes numpy interop easier"""
+
+    def test_arrays(self):
+        x, y = LineString([(0, 0), (1, 1)]).xy
+        assert len(x) == 2
+        assert list(x) == [0.0, 1.0]
+        assert len(y) == 2
+        assert list(y) == [0.0, 1.0]