def test_head(self):
#
# Retrieve head
#
v1 = Vertex((0,0))
v2 = Vertex((1,1))
half_edge = HalfEdge(v1,v2)
self.assertEqual(half_edge.head(), v2, 'Incorrect head.')
def test_make_twin(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
h12 = HalfEdge(v1,v2)
h21 = h12.make_twin()
self.assertIsNotNone(h12.twin())
self.assertIsNotNone(h21.twin())
self.assertEqual(h12.base(),h21.head())
self.assertEqual(h21.base(),h12.head())
def test_assign_twin(self):
#
# New half-edge
#
v1 = Vertex((0,0))
v2 = Vertex((1,1))
half_edge = HalfEdge(v1, v2)
#
# Try to assign incorrect twin
#
false_twin = HalfEdge(v1, v2)
self.assertRaises(Exception, half_edge.assign_twin, false_twin,\
'This twin should not be assignable.')
#
# Assign a good twin and check
#
good_twin = HalfEdge(v2, v1)
half_edge.assign_twin(good_twin)
self.assertEqual(good_twin.base(),half_edge.head(), \
'Heads and bases do not match.')
self.assertEqual(good_twin.head(),half_edge.base(), \
'Heads and bases do not match.')
def test_assign_next(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
v3 = Vertex((3,4))
h = HalfEdge(v1, v2)
#
# Incompatible next half_edge
#
bad_h_next = HalfEdge(v1, v3)
self.assertRaises(Exception, h.assign_next, (bad_h_next))
#
# Assign good next half-edge
#
good_h_next = HalfEdge(v2, v3)
h.assign_next(good_h_next)
# Check
self.assertEqual(h.next(),good_h_next,\
'Next HalfEdge incorrect.')
self.assertEqual(h.head(), h.next().base(), \
'Bases and heads should align.')
