Fixed ExPolygon::overlaps(), which was not commutative.
Wrote unit tests for Clipper polyline clipping operations. Rewrote ExPolygon unit tests from Perl to C++.
This commit is contained in:
Vojtech Bubnik
parent
f1c0c61895
commit
db3f696888
@ -154,14 +154,18 @@ bool ExPolygon::overlaps(const ExPolygon &other) const
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svg.draw_outline(*this);
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svg.draw_outline(other, "blue");
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#endif
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Polylines pl_out = intersection_pl(to_polylines(other), *this);
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#if 0
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svg.draw(pl_out, "red");
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#endif
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if (! pl_out.empty())
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return true;
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//FIXME ExPolygon::overlaps() shall be commutative, it is not!
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return this->contains(other.contour.points.front());
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// See unit test SCENARIO("Clipper diff with polyline", "[Clipper]")
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// for in which case the intersection_pl produces any intersection.
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return ! pl_out.empty() ||
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// If *this is completely inside other, then pl_out is empty, but the expolygons overlap. Test for that situation.
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other.contains(this->contour.points.front());
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}
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void ExPolygon::simplify_p(double tolerance, Polygons* polygons) const
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@ -60,6 +60,10 @@ public:
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// Does this expolygon overlap another expolygon?
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// Either the ExPolygons intersect, or one is fully inside the other,
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// and it is not inside a hole of the other expolygon.
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// The test may not be commutative if the two expolygons touch by a boundary only,
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// see unit test SCENARIO("Clipper diff with polyline", "[Clipper]").
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// Namely expolygons touching at a vertical boundary are considered overlapping, while expolygons touching
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// at a horizontal boundary are NOT considered overlapping.
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bool overlaps(const ExPolygon &other) const;
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void simplify_p(double tolerance, Polygons* polygons) const;
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@ -84,8 +84,7 @@ public:
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float overhangs_area = 0.f;
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bool overlaps(const Structure &rhs) const {
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//FIXME ExPolygon::overlaps() shall be commutative, it is not!
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return this->bbox.overlap(rhs.bbox) && (this->polygon->overlaps(*rhs.polygon) || rhs.polygon->overlaps(*this->polygon));
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return this->bbox.overlap(rhs.bbox) && this->polygon->overlaps(*rhs.polygon);
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}
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float overlap_area(const Structure &rhs) const {
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double out = 0.;
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@ -2,25 +2,115 @@
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#include "test_data.hpp"
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#include "clipper/clipper_z.hpp"
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#include "libslic3r/clipper.hpp"
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using namespace Slic3r;
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// Test case for an issue with duplicity vertices (same XY coordinates but differ in Z coordinates) in Clipper 6.2.9,
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// (related to https://sourceforge.net/p/polyclipping/bugs/160/) that was fixed in Clipper 6.4.2.
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// tests for ExPolygon::overlaps(const ExPolygon &other)
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SCENARIO("Clipper intersection with polyline", "[Clipper]")
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{
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struct TestData {
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ClipperLib::Path subject;
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ClipperLib::Path clip;
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ClipperLib::Paths result;
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};
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auto run_test = [](const TestData &data) {
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ClipperLib::Clipper clipper;
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clipper.AddPath(data.subject, ClipperLib::ptSubject, false);
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clipper.AddPath(data.clip, ClipperLib::ptClip, true);
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ClipperLib::PolyTree polytree;
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ClipperLib::Paths paths;
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clipper.Execute(ClipperLib::ctIntersection, polytree, ClipperLib::pftNonZero, ClipperLib::pftNonZero);
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ClipperLib::PolyTreeToPaths(polytree, paths);
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REQUIRE(paths == data.result);
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};
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WHEN("Open polyline completely inside stays inside") {
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run_test({
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{ { 10, 0 }, { 20, 0 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { 20, 0 }, { 10, 0 } } }
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});
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};
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WHEN("Closed polyline completely inside stays inside") {
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run_test({
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{ { 10, 0 }, { 20, 0 }, { 20, 20 }, { 10, 20 }, { 10, 0 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { 10, 0 }, { 20, 0 }, { 20, 20 }, { 10, 20 }, { 10, 0 } } }
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});
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};
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WHEN("Polyline which crosses right rectangle boundary is trimmed") {
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run_test({
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{ { 10, 0 }, { 2000, 0 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { 1000, 0 }, { 10, 0 } } }
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});
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};
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WHEN("Polyline which is outside clipping region is removed") {
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run_test({
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{ { 1500, 0 }, { 2000, 0 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ }
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});
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};
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WHEN("Polyline on left vertical boundary is kept") {
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run_test({
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{ { -1000, -1000 }, { -1000, 1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { -1000, -1000 }, { -1000, 1000 } } }
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});
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run_test({
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{ { -1000, 1000 }, { -1000, -1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { -1000, 1000 }, { -1000, -1000 } } }
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});
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};
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WHEN("Polyline on right vertical boundary is kept") {
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run_test({
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{ { 1000, -1000 }, { 1000, 1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { 1000, -1000 }, { 1000, 1000 } } }
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});
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run_test({
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{ { 1000, 1000 }, { 1000, -1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ { { 1000, 1000 }, { 1000, -1000 } } }
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});
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};
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WHEN("Polyline on bottom horizontal boundary is removed") {
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run_test({
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{ { -1000, -1000 }, { 1000, -1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ }
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});
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run_test({
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{ { 1000, -1000 }, { -1000, -1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ }
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});
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};
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WHEN("Polyline on top horizontal boundary is removed") {
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run_test({
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{ { -1000, 1000 }, { 1000, 1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ }
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});
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run_test({
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{ { 1000, 1000 }, { -1000, 1000 } },
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{ { -1000, -1000 }, { -1000, 1000 }, { 1000, 1000 }, { 1000, -1000 } },
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{ }
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});
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};
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}
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SCENARIO("Clipper Z", "[ClipperZ]")
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{
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ClipperLib_Z::Path subject;
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subject.emplace_back(-2000, -1000, 10);
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subject.emplace_back(-2000, 1000, 10);
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subject.emplace_back( 2000, 1000, 10);
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subject.emplace_back( 2000, -1000, 10);
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ClipperLib_Z::Path clip;
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clip.emplace_back(-1000, -2000, -5);
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clip.emplace_back(-1000, 2000, -5);
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clip.emplace_back( 1000, 2000, -5);
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clip.emplace_back( 1000, -2000, -5);
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ClipperLib_Z::Path subject { { -2000, -1000, 10 }, { -2000, 1000, 10 }, { 2000, 1000, 10 }, { 2000, -1000, 10 } };
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ClipperLib_Z::Path clip{ { -1000, -2000, -5 }, { -1000, 2000, -5 }, { 1000, 2000, -5 }, { 1000, -2000, -5 } };
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ClipperLib_Z::Clipper clipper;
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clipper.ZFillFunction([](const ClipperLib_Z::IntPoint &e1bot, const ClipperLib_Z::IntPoint &e1top, const ClipperLib_Z::IntPoint &e2bot,
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@ -40,4 +130,5 @@ SCENARIO("Clipper Z", "[ClipperZ]")
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REQUIRE(paths.front().size() == 2);
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for (const ClipperLib_Z::IntPoint &pt : paths.front())
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REQUIRE(pt.z() == 1);
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}
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}
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@ -12,6 +12,7 @@ add_executable(${_TEST_NAME}_tests
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test_config.cpp
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test_curve_fitting.cpp
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test_elephant_foot_compensation.cpp
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test_expolygon.cpp
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test_geometry.cpp
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test_placeholder_parser.cpp
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test_polygon.cpp
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67
tests/libslic3r/test_expolygon.cpp
Normal file
67
tests/libslic3r/test_expolygon.cpp
Normal file
@ -0,0 +1,67 @@
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#include <catch2/catch.hpp>
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#include "libslic3r/Point.hpp"
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#include "libslic3r/Polygon.hpp"
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#include "libslic3r/ExPolygon.hpp"
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using namespace Slic3r;
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static inline bool points_close(const Point &p1, const Point &p2)
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{
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return (p1 - p2).cast<double>().norm() < SCALED_EPSILON;
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}
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static bool polygons_close_permuted(const Polygon &poly1, const Polygon &poly2, const std::vector<int> &permutation2)
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{
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if (poly1.size() != poly2.size() || poly1.size() != permutation2.size())
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return false;
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for (size_t i = 0; i < poly1.size(); ++ i)
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if (poly1[i] != poly2[permutation2[i]])
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return false;
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return true;
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}
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SCENARIO("Basics", "[ExPolygon]") {
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GIVEN("ccw_square") {
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Polygon ccw_square{ { 100, 100 }, { 200, 100 }, { 200, 200 }, { 100, 200 } };
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Polygon cw_hole_in_square{ { 140, 140 }, { 140, 160 }, { 160, 160 }, { 160, 140 } };
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ExPolygon expolygon { ccw_square, cw_hole_in_square };
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THEN("expolygon is valid") {
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REQUIRE(expolygon.is_valid());
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}
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THEN("expolygon area") {
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REQUIRE(expolygon.area() == Approx(100*100-20*20));
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}
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WHEN("Expolygon scaled") {
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ExPolygon expolygon2 = expolygon;
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expolygon2.scale(2.5);
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REQUIRE(expolygon.contour.size() == expolygon2.contour.size());
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REQUIRE(expolygon.holes.size() == 1);
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REQUIRE(expolygon2.holes.size() == 1);
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for (size_t i = 0; i < expolygon.contour.size(); ++ i)
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REQUIRE(points_close(expolygon.contour[i] * 2.5, expolygon2.contour[i]));
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for (size_t i = 0; i < expolygon.holes.front().size(); ++ i)
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REQUIRE(points_close(expolygon.holes.front()[i] * 2.5, expolygon2.holes.front()[i]));
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}
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WHEN("Expolygon translated") {
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ExPolygon expolygon2 = expolygon;
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expolygon2.translate(10, -5);
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REQUIRE(expolygon.contour.size() == expolygon2.contour.size());
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REQUIRE(expolygon.holes.size() == 1);
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REQUIRE(expolygon2.holes.size() == 1);
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for (size_t i = 0; i < expolygon.contour.size(); ++ i)
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REQUIRE(points_close(expolygon.contour[i] + Point(10, -5), expolygon2.contour[i]));
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for (size_t i = 0; i < expolygon.holes.front().size(); ++ i)
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REQUIRE(points_close(expolygon.holes.front()[i] + Point(10, -5), expolygon2.holes.front()[i]));
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}
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WHEN("Expolygon rotated around point") {
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ExPolygon expolygon2 = expolygon;
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expolygon2.rotate(M_PI / 2, Point(150, 150));
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REQUIRE(expolygon.contour.size() == expolygon2.contour.size());
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REQUIRE(expolygon.holes.size() == 1);
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REQUIRE(expolygon2.holes.size() == 1);
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REQUIRE(polygons_close_permuted(expolygon2.contour, expolygon.contour, { 1, 2, 3, 0}));
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REQUIRE(polygons_close_permuted(expolygon2.holes.front(), expolygon.holes.front(), { 3, 0, 1, 2}));
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}
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}
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}
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@ -1,69 +0,0 @@
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#!/usr/bin/perl
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use strict;
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use warnings;
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use List::Util qw(first sum);
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use Slic3r::XS;
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use Test::More tests => 7;
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use constant PI => 4 * atan2(1, 1);
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my $square = [ # ccw
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[100, 100],
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[200, 100],
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[200, 200],
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[100, 200],
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];
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my $hole_in_square = [ # cw
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[140, 140],
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[140, 160],
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[160, 160],
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[160, 140],
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];
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my $expolygon = Slic3r::ExPolygon->new($square, $hole_in_square);
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ok $expolygon->is_valid, 'is_valid';
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is_deeply $expolygon->clone->pp, [$square, $hole_in_square], 'clone';
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is $expolygon->area, 100*100-20*20, 'area';
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{
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my $expolygon2 = $expolygon->clone;
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$expolygon2->scale(2.5);
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is_deeply $expolygon2->pp, [
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[map [ 2.5*$_->[0], 2.5*$_->[1] ], @$square],
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[map [ 2.5*$_->[0], 2.5*$_->[1] ], @$hole_in_square]
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], 'scale';
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}
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{
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my $expolygon2 = $expolygon->clone;
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$expolygon2->translate(10, -5);
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is_deeply $expolygon2->pp, [
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[map [ $_->[0]+10, $_->[1]-5 ], @$square],
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[map [ $_->[0]+10, $_->[1]-5 ], @$hole_in_square]
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], 'translate';
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}
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{
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my $expolygon2 = $expolygon->clone;
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$expolygon2->rotate(PI/2, Slic3r::Point->new(150,150));
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is_deeply $expolygon2->pp, [
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[ @$square[1,2,3,0] ],
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[ @$hole_in_square[3,0,1,2] ]
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], 'rotate around Point';
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}
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{
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my $expolygon2 = $expolygon->clone;
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$expolygon2->rotate(PI/2, [150,150]);
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is_deeply $expolygon2->pp, [
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[ @$square[1,2,3,0] ],
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[ @$hole_in_square[3,0,1,2] ]
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], 'rotate around pure-Perl Point';
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}
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__END__
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