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test_parsing.py: Add test_roundoff example 

This test currently fails due to math.acos(1.0000000000001) raising a
ValueError.
pull/31/head
Anders Granskogen Bjørnstad 2017-11-10 13:39:43 +01:00
parent 5d65d575b5
commit 316dc8bfe9
1 changed files with 28 additions and 0 deletions
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28
test/test_parsing.py
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@ -137,3 +137,31 @@ class TestParser(unittest.TestCase):
def test_errors(self):
self.assertRaises(ValueError, parse_path, 'M 100 100 L 200 200 Z 100 200')
def test_roundoff(self):
"""Paths with arc segments may have floating point round-off issues"""
path1 = parse_path("""
M160.172,102.95
L159.922,102.95
A0.025,0.025 0 0,1 159.897,102.925
L159.897,102.675
A0.025,0.025 0 0,1 159.922,102.65
L160.172,102.65
A0.025,0.025 0 0,1 160.197,102.675
L160.197,102.925
A0.025,0.025 0 0,1 160.172,102.95""")
path2 = Path(Line(start=(160.172 + 102.95j), end=(159.922 + 102.95j)),
Arc(start=(159.922 + 102.95j), radius=(0.025 + 0.025j), rotation=0.0,
large_arc=False, sweep=True, end=(159.897 + 102.925j)),
Line(start=(159.897 + 102.925j), end=(159.897 + 102.675j)),
Arc(start=(159.897 + 102.675j), radius=(0.025 + 0.025j), rotation=0.0,
large_arc=False, sweep=True, end=(159.922 + 102.65j)),
Line(start=(159.922 + 102.65j), end=(160.172 + 102.65j)),
Arc(start=(160.172 + 102.65j), radius=(0.025 + 0.025j), rotation=0.0,
large_arc=False, sweep=True, end=(160.197 + 102.675j)),
Line(start=(160.197 + 102.675j), end=(160.197 + 102.925j)),
Arc(start=(160.197 + 102.925j), radius=(0.025 + 0.025j), rotation=0.0,
large_arc=False, sweep=True, end=(160.172 + 102.95j)))
self.assertEqual(path1, path2)