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[buffer] fix non-intersecting sides around concave points

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there was no segment in between generated, therefore if the side-segments
did not intersect (e.g. donut_diamond in polygon_buffer.cpp unit test),
there was no intersection at all. Now a helper piece is generated and it
will intersect.
This commit is contained in:
Barend Gehrels
2014-06-22 15:12:40 +02:00
parent a0a296877f
commit 3628e85a25
7 changed files with 118 additions and 86 deletions
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9
test/algorithms/buffer/polygon_buffer.cpp
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@@ -26,6 +26,8 @@ static std::string const chained_box
static std::string const donut_simplex
= "POLYGON ((0 0,1 9,8 1,0 0),(1 1,4 1,1 4,1 1))";
static std::string const donut_diamond
= "POLYGON((15 0,15 15,30 15,30 0,15 0),(26 11,22 14,19 10,23 07,26 11))";
static std::string const letter_L
= "POLYGON ((0 0,0 4,1 4,1 1,3 1,3 0,0 0))";
static std::string const indentation
@@ -133,6 +135,11 @@ void test_all()
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("donut_simplex16", donut_simplex, 93.777, 1.6);
test_one<polygon_type, buf::join_round, buf::end_skip, polygon_type>("donut_simplex16", donut_simplex, 87.933, 1.6);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("donut_diamond1", donut_diamond, 280.0, 1.0);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("donut_diamond4", donut_diamond, 529.0, 4.0);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("donut_diamond5", donut_diamond, 625.0, 5.0);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("donut_diamond6", donut_diamond, 729.0, 6.0);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("arrow4", arrow, 28.265, 0.4);
test_one<polygon_type, buf::join_round, buf::end_skip, polygon_type>("arrow4", arrow, 27.039, 0.4);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("arrow5", arrow, 31.500, 0.5);
@@ -241,8 +248,10 @@ void test_all()
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>(out.str(), bowl, expected_miter[i - 1], double(i) / 2.0);
}
}
#if defined(BOOST_GEOMETRY_BUFFER_INCLUDE_FAILING_TESTS)
test_one<polygon_type, buf::join_round, buf::end_skip, polygon_type>("county1", county1, 0.00114092, 0.01, 0.01, false);
test_one<polygon_type, buf::join_miter, buf::end_skip, polygon_type>("county1", county1, 0.00132859, 0.01, 0.01, false);
#endif
// Negative buffers making polygons smaller
test_one<polygon_type, buf::join_round, buf::end_skip, polygon_type>("simplex", simplex, 7.04043, -0.5);