def test_line_intersect_order_independent(self):
a1 = (0.0, 0.0)
a2 = (2.0, 0.0)
b1 = (0.5, -0.5)
b2 = (0.5, 0.5)
hit1 = line_intersect(a1, a2, b1, b2)
hit2 = line_intersect(b1, b2, a1, a2)
self.assertEqual(hit1[0], hit2[0],
'order of line segment points should not matter')
self.assertEqual(hit1[1], hit2[1],
'order of line segment points should not matter')
def test_line_intersect_order_independent(self):
a1 = (0.0, 0.0)
a2 = (2.0, 0.0)
b1 = (0.5, -0.5)
b2 = (0.5, 0.5)
hit1 = line_intersect(a1, a2, b1, b2)
hit2 = line_intersect(b1, b2, a1, a2)
self.assertEqual(hit1[0], hit2[0],
'order of line segment points should not matter')
self.assertEqual(hit1[1], hit2[1],
'order of line segment points should not matter')
def test_line_intersect_cross(self):
ix, iy = line_intersect((0.0, 0.0), (2.0, 0.0), (0.5, -0.5),
(0.5, 0.5))
self.assertAlmostEqual(ix, 0.5, 7,
'wrong x-intersection point for cross')
self.assertAlmostEqual(iy, 0.0, 7,
'wrong y-intersection point for cross')
def test_line_intersect_miss(self):
with self.assertRaises(ArithmeticError):
line_intersect((0, 0), (0, 2), (2, 1), (0, 3))
def test_line_intersect_t(self):
ix, iy = line_intersect((0, 0), (0, 2), (-1, 1), (0, 1))
self.assertAlmostEqual(ix, 0, 7,
'wrong x-intersection point for shared point')
self.assertAlmostEqual(iy, 1, 7,
'wrong y-intersection point for shared point')
def test_line_intersect_cross(self):
ix, iy = line_intersect((0.0, 0.0), (2.0, 0.0), (0.5, -0.5), (0.5, 0.5))
self.assertAlmostEqual(ix, 0.5, 7,
'wrong x-intersection point for cross')
self.assertAlmostEqual(iy, 0.0, 7,
'wrong y-intersection point for cross')
def test_line_intersect_miss(self):
with self.assertRaises(ArithmeticError):
line_intersect((0, 0), (0, 2), (2, 1), (0, 3))
def test_line_intersect_t(self):
ix, iy = line_intersect((0, 0), (0, 2), (-1, 1), (0, 1))
self.assertAlmostEqual(ix, 0, 7,
'wrong x-intersection point for shared point')
self.assertAlmostEqual(iy, 1, 7,
'wrong y-intersection point for shared point')