def test_path_selfintersection_subpath():
p1 = "M0 0L1 1M0 1L1 0"
mock_elem = {"id": "theid", "d": p1}
checker = IntersectionChecker()
res = list(checker(mock_elem))
eq_(res, [])
collect_res = list(checker.collect())
eq_(len(collect_res), 1)
collect_res = collect_res[0]
eq_(collect_res.elem, mock_elem)
eq_(unicode(collect_res), "intersection found: theid (intersection: POINT (0.5 0.5))")
def test_selfintersect_L_and_Z():
"""
a Z-shape with a closepath at the end intersects itself
"""
p1 = "M1 0 0 0 1 1 0 1 Z"
mock_elem = {"id": "theid", "d": p1}
checker = IntersectionChecker()
res = list(checker(mock_elem))
eq_(res, [])
collect_res = list(checker.collect())
eq_(len(collect_res), 1)
collect_res = collect_res[0]
eq_(collect_res.elem, mock_elem)
eq_(unicode(collect_res), "self-intersection found: theid")
def test_selfintersect_M_only_subpath():
"""
M with more than one point as argument is the same as M + L
"""
p1 = "M0 0 1 1M0 1 1 0"
mock_elem = {"id": "theid", "d": p1}
checker = IntersectionChecker()
res = list(checker(mock_elem))
eq_(res, [])
collect_res = list(checker.collect())
eq_(len(collect_res), 1)
collect_res = collect_res[0]
eq_(collect_res.elem, mock_elem)
eq_(unicode(collect_res), "intersection found: theid (intersection: POINT (0.5 0.5))")
def test_straight_intersect():
"""
two lines with an intersection
"""
p1 = "M0 0 1 1"
p2 = "M1 0 0 1"
e1 = {"id": "elem1", "d": p1}
e2 = {"id": "elem2", "d": p2}
checker = IntersectionChecker()
res = list(checker(e1))
eq_(res, [])
res = list(checker(e2))
eq_(res, [])
collect_res = list(checker.collect())
eq_(len(collect_res), 1)
collect_res = collect_res[0]
eq_(collect_res.elem, e2)
eq_(unicode(collect_res), "intersection found: elem2 (intersection: POINT (0.5 0.5))")