def _get_straight_line_intersection(x, other_y1, other_y2, self_y1, self_y2):
"""Get the intersection point of two straight vertical lines."""
self_y = Interval(left=min(self_y1, self_y2), right=max(self_y1, self_y2))
other_y = Interval(left=min(other_y1, other_y2),
right=max(other_y1, other_y2))
intersection = self_y.intersection(other_y)
if intersection.left == intersection.right:
return Point(x, intersection.left)
else:
return LineSegment(Point(x, intersection.left),
Point(x, intersection.right))
def test_interval_intersection():
i42 = Interval(42, 1337)
assert Interval(None, None).intersection(i42) == Interval(None, None)
assert i42.intersection(Interval(None, None)) == Interval(None, None)
assert Interval(0, 1).intersection(Interval(1, 3)) == Interval(1, 1)
assert Interval(0, 1).intersection(Interval(2, 4)) == Interval(None, None)
assert Interval(0, 1).intersection(Interval(3, 5)) == Interval(None, None)
assert Interval(0, 1).intersection(Interval(-1, 6)) == Interval(0, 1)
assert Interval(1, 3).intersection(Interval(2, 4)) == Interval(2, 3)
assert Interval(1, 3).intersection(Interval(3, 5)) == Interval(3, 3)
assert Interval(1, 3).intersection(Interval(-1, 6)) == Interval(1, 3)
assert Interval(2, 4).intersection(Interval(3, 5)) == Interval(3, 4)
assert Interval(2, 4).intersection(Interval(-1, 6)) == Interval(2, 4)
assert Interval(3, 5).intersection(Interval(-1, 6)) == Interval(3, 5)
assert Interval(1, 10).intersection(Interval(-1, 12)) == Interval(1, 10)
def test_interval_intersection_non_interval():
i1 = Interval(0, 10)
iu1 = IntervalUnion([[0, 1], [2, 3]])
i1.intersection(iu1) == iu1
