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Add orientation test for ring with collapsed elements #1426

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Add orientation test for ring with collapsed elements #1426

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0faabcf
Add orientation test for ring with collapsed elements
strk Apr 13, 2026
b927eee
Fix the WKT of the collapsed topology ring
strk Apr 13, 2026
388bfae
Test also in WKB form
strk Apr 13, 2026
69b9768
Add new failing test
strk Apr 13, 2026
65f4010
Simplify test for ticket GH-1425
strk Apr 16, 2026
031b0c1
Another case involving no danglings
strk Apr 16, 2026
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30 changes: 30 additions & 0 deletions tests/unit/algorithm/CGAlgorithms/OrientationIsCCWTest.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -248,6 +248,36 @@ void object::test<16>
}


// See https://trac.osgeo.org/postgis/ticket/6065
template<>
template<>
void object::test<17>
()
{
const std::string wkt("POLYGON ((2 1, 2 0, 0 2, 0 0,0 2, 2 1))");
checkCCW(false, wkt);
}


// See https://trac.osgeo.org/postgis/ticket/6065
template<>
template<>
void object::test<18>
()
{
const std::string wkt("POLYGON ((0 0,0 2, 2 1, 2 0, 0 2, 0 0))");
checkCCW(false, wkt);
}
//
// See https://trac.osgeo.org/postgis/ticket/6065
template<>
template<>
void object::test<19>
()
{
const std::string wkt("POLYGON ((-1 0,0 2, 2 1, 2 0, 0 2, 0 0, -1 0))");
checkCCW(false, wkt);
}


} // namespace tut
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