def test_partly_overlapping_segments(self):
s0 = np.array([0, 0])
e0 = np.array([2, 0])
s1 = np.array([1, 0])
e1 = np.array([3, 0])
pi = basics.lines_intersect(s0, e0, s1, e1)
assert (pi[0, 0] == 1 and pi[0, 1] == 2) or \
(pi[0, 0] == 2 and pi[0, 1] == 1)
assert np.allclose(pi[1], 0)
# Then test order of arguments
pi = basics.lines_intersect(e0, s0, s1, e1)
assert (pi[0, 0] == 1 and pi[0, 1] == 2) or \
(pi[0, 0] == 2 and pi[0, 1] == 1)
assert np.allclose(pi[1], 0)
pi = basics.lines_intersect(s0, e0, e1, s1)
assert (pi[0, 0] == 1 and pi[0, 1] == 2) or \
(pi[0, 0] == 2 and pi[0, 1] == 1)
assert np.allclose(pi[1], 0)
pi = basics.lines_intersect(e0, s0, e1, s1)
assert (pi[0, 0] == 1 and pi[0, 1] == 2) or \
(pi[0, 0] == 2 and pi[0, 1] == 1)
assert np.allclose(pi[1], 0)
def test_lines_intersect_segments_do_not(self):
s0 = np.array([0.3, 0.3])
e0 = np.array([0.5, 0.5])
s1 = np.array([0, 2/3])
e1 = np.array([1, 2/3])
pi = basics.lines_intersect(s0, e0, s1, e1)
assert(pi is None or len(pi)==0)
def test_meeting_in_point(self):
s0 = np.array([0, 0])
e0 = np.array([1, 0])
s1 = np.array([1, 0])
e1 = np.array([2, 0])
pi = basics.lines_intersect(s0, e0, s1, e1)
assert pi[0, 0] == 1 and pi[1, 0] == 0
def test_colinear_not_intersecting(self):
s0 = np.array([0, 0])
e0 = np.array([1, 0])
s1 = np.array([2, 0])
e1 = np.array([3, 0])
pi = basics.lines_intersect(s0, e0, s1, e1)
assert pi is None
def test_parallel_not_colinear(self):
s0 = np.array([0, 0])
e0 = np.array([1, 0])
s1 = np.array([0, 1])
e1 = np.array([1, 1])
pi = basics.lines_intersect(s0, e0, s1, e1)
assert pi is None