def test_circle_circle():
# functionality tested in test_r2_circle
circle1 = Circle(100, P2(0, 0))
circle2 = Circle(100, P2(100, 100))
assert {P2(0.0, 100.0), P2(100.0, 0.0)} == intersect(circle1, circle2)
def test_offset_circle_contains():
circle = Circle(100, P2(2, 2))
assert circle.contains(P2(0, 0))
assert not circle.contains(P2(-99, 0))
assert P2(0, 0) in circle
assert P2(-99, 0) not in circle
def test_create_degenerate():
with pytest.raises(ValueError):
Circle(0)
with pytest.raises(ValueError):
Circle(-10)
def test_does_intersect_circle_circle():
c1 = Circle(100)
c2 = Circle(100, P2(500, 500))
assert not does_intersect(c1, c2)
assert not does_intersect(c1, Circle(50))
assert does_intersect(c1, Circle(100, P2(10, 10)))
def test_circle_contains():
circle = Circle(100)
assert circle.contains(P2(-100, 0))
assert circle.contains(P2(100, 0))
assert circle.contains(P2(0, 100))
assert circle.contains(P2(0, -100))
assert not circle.contains(P2(150, 0))
assert not circle.contains(P2(0, 150))
with pytest.raises(TypeError):
circle.contains(None)
with pytest.raises(TypeError):
circle.contains(V2(0, 0))
def test_circle_create():
circle = Circle(100)
assert circle.radius == 100
assert circle.center == P2(0, 0)
circle = Circle(100, P2(100, 100))
assert circle.radius == 100
assert circle.center == P2(100, 100)
with pytest.raises(TypeError):
Circle(100, V2(100, 100))
with pytest.raises(TypeError):
Circle(None)
def test_on_perimeter():
circle = Circle(100)
assert not circle.on_circumference(P2(0, 0))
assert circle.on_circumference(P2(100, 0))
assert circle.on_circumference(P2(0, 100))
circle = Circle(100, P2(1, 1))
assert not circle.on_circumference(P2(0, 0))
assert circle.on_circumference(P2(1, -99))
assert circle.on_circumference(P2(-99, 1))
assert circle.on_circumference(P2(101, 1))
assert circle.on_circumference(P2(1, 101))
def test_line_circle():
circle = Circle(100, P2(1, 1))
x = Line(1, 0, 1)
points = intersect(x, circle)
assert {P2(1.0, 101.0), P2(1.0, -99.0)} == points
points = intersect(circle, x)
assert {P2(1.0, 101.0), P2(1.0, -99.0)} == points
tangent_circle = Circle(1, P2(2, 0))
assert {P2(1.0, 0.0)} == intersect(tangent_circle, x)
assert {P2(1.0, 0.0)} == intersect(x, tangent_circle)
horz = Line(0, 1, 1)
assert {P2(-99.0, 1.0), P2(101, 1.0)} == intersect(horz, circle)
assert {P2(-99.0, 1.0), P2(101, 1.0)} == intersect(circle, horz)
far_line = Line(1, 0, 200)
assert set() == intersect(far_line, circle)
assert set() == intersect(circle, far_line)
def test_line_segment_circle():
circle = Circle(100, P2(1, 0))
x = LineSegment(P2(1, -1000), P2(1, 1000))
points = intersect(x, circle)
assert {P2(1.0, 100.0), P2(1.0, -100.0)} == points
points = intersect(circle, x)
assert {P2(1.0, 100.0), P2(1.0, -100.0)} == points
x2 = LineSegment(P2(1, -1000), P2(1, 0))
assert {P2(1.0, -100.0)} == intersect(circle, x2)
assert {P2(1.0, -100.0)} == intersect(x2, circle)
def test_does_intersect_circle_line_segment():
circle = Circle(100)
ls_right = LineSegment(P2(50, 0), P2(150, 0))
assert does_intersect(circle, ls_right)
assert does_intersect(ls_right, circle)
ls_left = LineSegment(P2(-50, -50), P2(-100, -100))
assert does_intersect(circle, ls_left)
assert does_intersect(ls_left, circle)
ls_inside = LineSegment(P2(-25, -25), P2(25, 25))
assert not does_intersect(circle, ls_inside)
assert not does_intersect(ls_inside, circle)
ls_outside = LineSegment(P2(0, 175), P2(175, 0))
assert not does_intersect(circle, ls_outside)
assert not does_intersect(ls_outside, circle)
def test_does_intersect_line_circle():
circle = Circle(99, P2(100, 100))
assert not does_intersect(circle, Line(1, 1, 0))
assert not does_intersect(Line(1, 1, 0), circle)
assert does_intersect(circle, Line(1, -1, 0))
assert does_intersect(Line(1, -1, 0), circle)
assert does_intersect(circle, Line(1, 0, 100))
assert does_intersect(Line(1, 0, 100), circle)
assert does_intersect(circle, Line(0, 1, 100))
assert does_intersect(Line(0, 1, 100), circle)
assert not does_intersect(circle, Line(1, 0, 0))
assert not does_intersect(Line(1, 0, 0), circle)
assert does_intersect(circle, Line(1, 0, 1))
assert does_intersect(Line(1, 0, 1), circle)
def test_circle_properties():
circle = Circle(100)
assert circle.diameter == 200
assert circle.circumference == pytest.approx(math.pi * 200)
assert circle.area == pytest.approx(math.pi * 100**2)