def test_split(self):
#
# New HalfEdge
#
v1 = Vertex((0,0))
v2 = Vertex((2,2))
half_edge = HalfEdge(v1, v2)
#
# Split it
#
half_edge.split()
#
# Check if the children behave
#
child_0, child_1 = half_edge.get_children()
self.assertEqual(child_0.head(), child_1.base(),\
'First child head should equal second child base.')
#
# Define twin half edge
#
twin = HalfEdge(v2, v1)
half_edge.assign_twin(twin)
twin.assign_twin(half_edge)
#
# Split twin
#
twin.split()
#
# Check wether children are twinned
#
c0, c1 = half_edge.get_children()
t0, t1 = twin.get_children()
self.assertEqual(c0.base(),t1.head(),\
'Children have incorrect twins.')
self.assertEqual(c0.head(),t1.base(),\
'Children have incorrect twins.')
self.assertEqual(c1.base(),t0.head(),\
'Children have incorrect twins.')
self.assertEqual(c1.head(),t0.base(),\
'Children have incorrect twins.')
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.')
