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_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_create(circle_00, circle_11):
with pytest.raises(ValueError):
Circle(0)
with pytest.raises(ValueError):
Circle(-100)
assert circle_00.center == P2(0, 0)
assert circle_00.radius == 100
assert circle_11.center == P2(1, 1)
assert circle_11.radius == 100
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 circle_00():
return Circle(100)
def test_circle_intersection(circle_00, circle_11):
far_circle = Circle(100, P2(500, 500))
with pytest.raises(ValueError):
circle_00.intersection(circle_00)
with pytest.raises(TypeError):
circle_00.intersection(None)
assert circle_00.intersection(far_circle) == set()
assert far_circle.intersection(circle_00) == set()
contained_circle = Circle(50)
assert circle_00.intersection(contained_circle) == set()
assert contained_circle.intersection(circle_00) == set()
tangent_circle = Circle(100, P2(200, 0))
assert circle_00.intersection(tangent_circle) == {P2(100.0, 0.0)}
assert tangent_circle.intersection(circle_00) == {P2(100.0, 0.0)}
intersecting_circle = Circle(100, P2(101, 101))
assert intersecting_circle.intersection(circle_11) == {
P2(101.0, 1.0),
P2(1.0, 101.0),
}
assert circle_11.intersection(intersecting_circle) == {
P2(101.0, 1.0),
P2(1.0, 101.0),
}
def circle_11():
return Circle(100, P2(1, 1))
def test_rasterize_circle():
expected = ApproxSet([P2(1, 0), P2(0, 1), P2(-1, 0), P2(0, -1)])
assert expected == rasterize(Circle(1), n=4)
expected = ApproxSet([P2(2, 1), P2(1, 2), P2(0, 1), P2(1, 0)])
assert expected == rasterize(Circle(1, P2(1, 1)), n=4)