def test_commutative_case(multisegments_pair: MultisegmentsPair) -> None:
first, second = multisegments_pair
result = subtract_multisegments(first, second)
assert equivalence(result == subtract_multisegments(second, first),
are_multisegments_equivalent(first, second))
def test_commutative_case(multisegments_pair: MultisegmentsPair) -> None:
left_multisegment, right_multisegment = multisegments_pair
result = subtract_multisegments(left_multisegment, right_multisegment)
assert equivalence(
result == subtract_multisegments(right_multisegment,
left_multisegment),
are_multisegments_equivalent(left_multisegment, right_multisegment))
def test_intersection_minuend(
multisegments_triplet: MultisegmentsTriplet) -> None:
first, second, third = multisegments_triplet
first_second_intersection = intersect_multisegments(first, second)
second_third_difference = subtract_multisegments(second, third)
assert (not is_multisegment(first_second_intersection)
or not is_multisegment(second_third_difference)
or (subtract_multisegments(first_second_intersection, third)
== intersect_multisegments(first, second_third_difference)))
def test_difference_operand(multisegments_triplet: MultisegmentsTriplet
) -> None:
first, second, third = multisegments_triplet
first_second_difference = subtract_multisegments(first, second)
first_third_intersection = intersect_multisegments(first, third)
assert (not is_multisegment(first_second_difference)
or not is_multisegment(first_third_intersection)
or (intersect_multisegments(first_second_difference, third)
== subtract_multisegments(first_third_intersection, second)))
def test_reversals(multisegments_pair: MultisegmentsPair) -> None:
left_multisegment, right_multisegment = multisegments_pair
result = subtract_multisegments(left_multisegment, right_multisegment)
assert are_multisegments_similar(
result,
subtract_multisegments(reverse_multisegment(left_multisegment),
right_multisegment))
assert result == subtract_multisegments(
left_multisegment, reverse_multisegment(right_multisegment))
def test_intersection_minuend(
multisegments_triplet: MultisegmentsTriplet) -> None:
(left_multisegment, mid_multisegment,
right_multisegment) = multisegments_triplet
result = subtract_multisegments(
intersect_multisegments(left_multisegment, mid_multisegment),
right_multisegment)
assert result == intersect_multisegments(
left_multisegment,
subtract_multisegments(mid_multisegment, right_multisegment))
def test_difference_operand(
multisegments_triplet: MultisegmentsTriplet) -> None:
first, second, third = multisegments_triplet
first_second_difference = subtract_multisegments(first, second)
second_third_difference = subtract_multisegments(second, third)
assert (not is_multisegment(first_second_difference)
or not is_multisegment(second_third_difference)
or are_multisegments_equivalent(
unite_multisegments(first_second_difference, third),
subtract_multisegments(unite_multisegments(first, third),
second_third_difference)))
def test_equivalents(multisegments_pair: MultisegmentsPair) -> None:
left_multisegment, right_multisegment = multisegments_pair
result = symmetric_subtract_multisegments(left_multisegment,
right_multisegment)
assert result == subtract_multisegments(
unite_multisegments(left_multisegment, right_multisegment),
intersect_multisegments(right_multisegment, left_multisegment))
assert result == unite_multisegments(
subtract_multisegments(left_multisegment, right_multisegment),
subtract_multisegments(right_multisegment, left_multisegment))
def test_union_subtrahend(multisegments_triplet: MultisegmentsTriplet) -> None:
first, second, third = multisegments_triplet
first_second_difference = subtract_multisegments(first, second)
first_third_difference = subtract_multisegments(first, third)
assert (not is_multisegment(first_second_difference)
or not is_multisegment(first_third_difference)
or are_compounds_similar(
subtract_multisegments(first, unite_multisegments(
second, third)),
intersect_multisegments(first_second_difference,
first_third_difference)))
def test_difference_operand(multisegments_triplet: MultisegmentsTriplet
) -> None:
(left_multisegment, mid_multisegment,
right_multisegment) = multisegments_triplet
result = intersect_multisegments(
subtract_multisegments(left_multisegment, mid_multisegment),
right_multisegment)
assert result == subtract_multisegments(
intersect_multisegments(left_multisegment, right_multisegment),
mid_multisegment)
def test_union_subtrahend(multisegments_triplet: MultisegmentsTriplet) -> None:
(left_multisegment, mid_multisegment,
right_multisegment) = multisegments_triplet
result = subtract_multisegments(
left_multisegment,
unite_multisegments(mid_multisegment, right_multisegment))
assert are_multisegments_similar(
result,
intersect_multisegments(
subtract_multisegments(left_multisegment, mid_multisegment),
subtract_multisegments(left_multisegment, right_multisegment)))
def test_difference_subtrahend(
multisegments_triplet: MultisegmentsTriplet) -> None:
(left_multisegment, mid_multisegment,
right_multisegment) = multisegments_triplet
result = subtract_multisegments(
left_multisegment,
subtract_multisegments(mid_multisegment, right_multisegment))
assert are_multisegments_equivalent(
result,
unite_multisegments(
subtract_multisegments(left_multisegment, mid_multisegment),
intersect_multisegments(left_multisegment, right_multisegment)))
def test_difference_operand(
multisegments_triplet: MultisegmentsTriplet) -> None:
(left_multisegment, mid_multisegment,
right_multisegment) = multisegments_triplet
result = unite_multisegments(
subtract_multisegments(left_multisegment, mid_multisegment),
right_multisegment)
assert are_multisegments_equivalent(
result,
subtract_multisegments(
unite_multisegments(left_multisegment, right_multisegment),
subtract_multisegments(mid_multisegment, right_multisegment)))
def test_reversals(multisegments_pair: MultisegmentsPair) -> None:
first, second = multisegments_pair
result = subtract_multisegments(first, second)
assert are_compounds_similar(
result, subtract_multisegments(reverse_multisegment(first), second))
assert result == subtract_multisegments(first,
reverse_multisegment(second))
assert are_compounds_similar(
result,
reverse_compound_coordinates(
subtract_multisegments(reverse_multisegment_coordinates(first),
reverse_multisegment_coordinates(second))))
def test_intersection_subtrahend(
multisegments_triplet: MultisegmentsTriplet) -> None:
first, second, third = multisegments_triplet
first_second_difference = subtract_multisegments(first, second)
first_third_difference = subtract_multisegments(first, third)
second_third_intersection = intersect_multisegments(second, third)
assert (not is_multisegment(first_second_difference)
or not is_multisegment(first_third_difference)
or not is_multisegment(second_third_intersection)
or are_multisegments_equivalent(
subtract_multisegments(first, second_third_intersection),
unite_multisegments(first_second_difference,
first_third_difference)))
def test_equivalents(multisegments_pair: MultisegmentsPair) -> None:
first, second = multisegments_pair
result = symmetric_subtract_multisegments(first, second)
first_second_difference = subtract_multisegments(first, second)
second_first_difference = subtract_multisegments(second, first)
second_first_intersection = intersect_multisegments(second, first)
assert (not is_multisegment(second_first_intersection)
or result == subtract_multisegments(
unite_multisegments(first, second), second_first_intersection))
assert (not is_multisegment(first_second_difference)
or not is_multisegment(second_first_difference)
or result == unite_multisegments(first_second_difference,
second_first_difference))
def __sub__(self, other: Compound[Coordinate]) -> Compound[Coordinate]:
"""
Returns difference of the multisegment with the other geometry.
Time complexity:
``O(segments_count * log segments_count)``
Memory complexity:
``O(segments_count)``
where ``segments_count = len(self.segments)``.
>>> from gon.base import EMPTY, Multisegment, Point, Segment
>>> multisegment = Multisegment([Segment(Point(0, 0), Point(1, 0)),
... Segment(Point(0, 1), Point(1, 1))])
>>> multisegment - multisegment is EMPTY
True
"""
return (self
if isinstance(other, Multipoint)
else (subtract_segment_from_multisegment(self, other,
context=self._context)
if isinstance(other, Segment)
else (subtract_multisegments(self, other,
context=self._context)
if isinstance(other, Multisegment)
else NotImplemented)))
def test_left_absorbing_element(
empty_multisegment_with_multisegment: MultisegmentsPair) -> None:
empty_multisegment, multisegment = empty_multisegment_with_multisegment
result = subtract_multisegments(empty_multisegment, multisegment)
assert not result.segments
def test_right_neutral_element(
empty_multisegment_with_multisegment: MultisegmentsPair) -> None:
empty_multisegment, multisegment = empty_multisegment_with_multisegment
result = subtract_multisegments(multisegment, empty_multisegment)
assert are_multisegments_similar(result, multisegment)
def __rsub__(self, other: Compound[Coordinate]) -> Compound[Coordinate]:
"""
Returns difference of the other geometry with the contour.
Time complexity:
``O(vertices_count * log vertices_count)``
Memory complexity:
``O(vertices_count)``
where ``vertices_count = len(self.vertices)``.
"""
return (subtract_multisegment_from_segment(
other, self, context=self._context)
if isinstance(other, Segment) else
(subtract_multisegments(other, self, context=self._context)
if isinstance(other, Multisegment) else NotImplemented))
def __sub__(self, other: Compound[Coordinate]) -> Compound[Coordinate]:
"""
Returns difference of the contour with the other geometry.
Time complexity:
``O(vertices_count * log vertices_count)``
Memory complexity:
``O(vertices_count)``
where ``vertices_count = len(self.vertices)``.
>>> from gon.base import EMPTY, Contour, Point
>>> contour = Contour([Point(0, 0), Point(1, 0), Point(0, 1)])
>>> contour - contour is EMPTY
True
"""
return (self if isinstance(other, Multipoint) else
(subtract_segment_from_multisegment(
self, other, context=self._context) if isinstance(
other, Segment) else
(subtract_multisegments(self, other, context=self._context)
if isinstance(other, Linear) else NotImplemented)))
def test_basic(multisegments_pair: MultisegmentsPair) -> None:
first, second = multisegments_pair
result = subtract_multisegments(first, second)
assert is_maybe_linear(result)
def test_basic(multisegments_pair: MultisegmentsPair) -> None:
left_multisegment, right_multisegment = multisegments_pair
result = subtract_multisegments(left_multisegment, right_multisegment)
assert is_multisegment(result)