def test_rotation_signed_area(random_quat):
"""Ensure that rotating does not change the signed area."""
assume(not np.all(random_quat == 0))
random_quat = rowan.normalize(random_quat)
rotated_points = rowan.rotate(random_quat, get_square_points())
poly = Polygon(rotated_points)
assert np.isclose(poly.signed_area, 1)
poly.reorder_verts(clockwise=True)
assert np.isclose(poly.signed_area, -1)
def test_area(square_points):
"""Test area calculation."""
# Shift to ensure that the negative areas are subtracted as needed.
points = np.asarray(square_points) + 2
square = Polygon(points)
assert square.signed_area == 1
assert square.area == 1
# Ensure that area is signed.
square.reorder_verts(True)
assert square.signed_area == -1
assert square.area == 1