def test_compute_center_from_both_tangents_but_same_points(self):
candidate = Arc.compute_center_from_both_tangents(
p0=Point(0, 0),
p1=Point(0, 0),
tangent_p0=Point(1, 1),
tangent_p1=Point(1, -1))
assert candidate == Point(0, 0)
def test_compute_center_from_both_tangents_simple(self):
candidate = Arc.compute_center_from_both_tangents(
p0=Point(-1, 0),
p1=Point(1, 0),
tangent_p0=Point(0, 1),
tangent_p1=Point(0, -1))
assert candidate == Point(0, 0)
def test_45deg_arc(self):
candidate = Arc(Point(1, 0), Point(0, 1), Point(0, 1))
assert math.isclose(candidate.angle, math.pi / 2)
assert candidate.center == Point(0, 0)
assert math.isclose(candidate.radius, 1)
assert candidate.direction == Arc.DIRECT
def test_arc_with_zero_radius(self):
candidate = Arc(start=Point(0, 0),
end=Point(0, 0),
start_tangent=Point(0, 1),
end_tangent=Point(0, -1))
assert candidate.radius == 0
assert candidate.angle == math.pi
assert candidate.center == Point(0., 0.)
def test_reverse_45deg_arc_BUG(self):
candidate = Arc(start=Point(1, 0),
end=Point(0, 1),
start_tangent=Point(0, -1))
assert candidate.center == Point(0, 0)
assert math.isclose(candidate.radius, 1)
assert candidate.end_tangent == Point(1, 0)
assert math.isclose(candidate.angle, -3 * math.pi / 2)
assert candidate.direction == Arc.INDIRECT
assert candidate.length > 0
def __init__(self, start: Point, end: Point, start_vector: Point,
end_vector: Point):
self.arc = Arc(start, end, start_vector, end_vector)
def test_circular_arc(self):
arc = Arc(start=Point(1, 0),
end=Point(0, 1),
start_tangent=Point(0, 1))
assert math.isclose(arc.angle, (math.pi / 2.0))
def test_compute_center_from_both_tangents_impossible(self):
with pytest.raises(AssertionError) as ae:
Arc.compute_center_from_both_tangents(p0=Point(-5, 2),
p1=Point(1, 0),
tangent_p0=Point(0, 1),
tangent_p1=Point(1, -1))
def test_simple_arc(self):
candidate = Arc(Point(-1, 0), Point(1, 0), Point(0, 1))
assert candidate.radius == 1
assert candidate.angle == -math.pi
assert candidate.center == Point(0., 0.)
def test_find_find_angle_and_chord_vector(self):
angle, u, distance = Arc.find_angle_and_chord_vector(
Point(-1, 0), Point(1, 0), Point(0, 1))
assert angle == math.pi