import numpy as np
import pytest
from shapely import LineString, geos_version
from shapely.tests.common import (
line_string,
line_string_m,
line_string_z,
line_string_zm,
point,
point_m,
point_z,
point_zm,
)
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_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_coords_z(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_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_coords_z(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]
@pytest.mark.parametrize("geom", [point, point_z, line_string, line_string_z])
def test_coords_array_copy(geom):
"""Test CoordinateSequence.__array__ method."""
coord_seq = geom.coords
assert np.array(coord_seq) is not np.array(coord_seq)
assert np.array(coord_seq, copy=True) is not np.array(coord_seq, copy=True)
# Behaviour of copy=False is different between NumPy 1.x and 2.x
if int(np.version.short_version.split(".", 1)[0]) >= 2:
with pytest.raises(ValueError, match="A copy is always created"):
np.array(coord_seq, copy=False)
else:
assert np.array(coord_seq, copy=False) is np.array(coord_seq, copy=False)
@pytest.mark.skipif(geos_version < (3, 12, 0), reason="GEOS < 3.12")
def test_coords_with_m():
assert point_m.coords[:] == [(2.0, 3.0, 5.0)]
assert point_zm.coords[:] == [(2.0, 3.0, 4.0, 5.0)]
assert line_string_m.coords[:] == [
(0.0, 0.0, 1.0),
(1.0, 0.0, 2.0),
(1.0, 1.0, 3.0),
]
assert line_string_zm.coords[:] == [
(0.0, 0.0, 4.0, 1.0),
(1.0, 0.0, 4.0, 2.0),
(1.0, 1.0, 4.0, 3.0),
]