def test_region_invert_compare_invert():
"""-r and field()-r should ideally filter the same way
but they are potentially different.
"""
shape = "rect(100, 100, 104, 106)"
r = Region(shape)
r.invert()
check_region_invert_compare(r)
def test_region_invert():
"""Can we invert a region?"""
x = np.asarray([50, 95, 105])
y = np.asarray([50, 105, 115])
r = Region("box(100,100,10,20)")
assert r.mask(x, y) == pytest.approx([0, 1, 0])
r.invert()
assert str(r) == "!Box(100,100,10,20)"
assert r.mask(x, y) == pytest.approx([1, 0, 1])
def test_region_invert_empty():
"""Can we invert an empty region?"""
x = np.asarray([50, 95, 105])
y = np.asarray([50, 105, 115])
r = Region()
assert r.mask(x, y) == pytest.approx([0, 0, 0])
r.invert()
assert str(r) == ''
assert r.mask(x, y) == pytest.approx([0, 0, 0])
