def test_small_to_large(self):
c0 = aphex.Circle(x=160, y=450, r=30)
c1 = aphex.Circle(x=500, y=100, r=65)
result = aphex.tangent(c0, c1, aphex.RIGHT, aphex.RIGHT)
expected = aphex.Segment(x0=179.96358510145777,
y0=472.3931969557018,
x1=543.2544343864918,
y1=148.51859340402063)
self.assertEqual(result, expected)
def test_outer(self):
c0 = aphex.Circle(0, 0, 4)
c1 = aphex.Circle(5, 5, 3)
result_ll = aphex.tangent(c0, c1, aphex.LEFT, aphex.LEFT)
result_rr = aphex.tangent(c0, c1, aphex.RIGHT, aphex.RIGHT)
expected_ll = aphex.Segment(3.2, -2.4, 7.4, 3.2)
expected_rr = aphex.Segment(-2.4, 3.2, 3.2, 7.4)
self.assertEqual(result_ll, expected_ll)
self.assertEqual(result_rr, expected_rr)
def test_outer_same_r(self):
c0 = aphex.Circle(0, 0, 2)
c1 = aphex.Circle(5, 5, 2)
result_ll = aphex.tangent(c0, c1, aphex.LEFT, aphex.LEFT)
result_rr = aphex.tangent(c0, c1, aphex.RIGHT, aphex.RIGHT)
expected_ll = aphex.Segment(1.414213562373095, -1.414213562373095,
6.414213562373095, 3.585786437626905)
expected_rr = aphex.Segment(-1.414213562373095, 1.414213562373095,
3.585786437626905, 6.414213562373095)
self.assertEqual(result_ll, expected_ll)
self.assertEqual(result_rr, expected_rr)
def test_right_to_left(self):
# c0 is bigger
c0 = aphex.Circle(0, 0, 4)
c1 = aphex.Circle(10, 0, 3)
result_rl = aphex.tangent(c0, c1, aphex.RIGHT, aphex.LEFT)
self.assertGreater(result_rl.y0, result_rl.y1)
# c1 is bigger
c0 = aphex.Circle(0, 0, 3)
c1 = aphex.Circle(10, 0, 4)
result_rl = aphex.tangent(c0, c1, aphex.RIGHT, aphex.LEFT)
self.assertGreater(result_rl.y0, result_rl.y1)
def test_inner(self):
c0 = aphex.Circle(0, 0, 4)
c1 = aphex.Circle(5, 5, 3)
result_lr = aphex.tangent(c0, c1, aphex.LEFT, aphex.RIGHT)
result_rl = aphex.tangent(c0, c1, aphex.RIGHT, aphex.LEFT)
expected_lr = aphex.Segment(
3.2,
2.4,
2.600000000000001,
3.1999999999999993,
)
expected_rl = aphex.Segment(2.4, 3.2, 3.1999999999999993,
2.600000000000001)
self.assertEqual(result_lr, expected_lr)
self.assertEqual(result_rl, expected_rl)
def test_compute_center(self):
tests = [
([
aphex.Circle(0, 0, 4),
aphex.Circle(5, 5, 3),
], (2.5, 2.5)),
([
aphex.Circle(0, 0, 3),
aphex.Circle(5, 5, 3),
aphex.Circle(-5, -5, 3),
], (0, 0)),
([
aphex.Circle(0, 0, 3),
aphex.Circle(6, 5, 3),
aphex.Circle(0, 1, 3),
], (2, 2)),
]
for (circles, expected) in tests:
self.assertEqual(aphex.compute_center(circles), expected)