#include #include #include #include #include "libslic3r/ClipperUtils.hpp" #include "libslic3r/ExPolygon.hpp" #include "libslic3r/SVG.hpp" using namespace Slic3r; SCENARIO("Various Clipper operations - xs/t/11_clipper.t", "[ClipperUtils]") { // CCW oriented contour Slic3r::Polygon square{ { 200, 100 }, {200, 200}, {100, 200}, {100, 100} }; // CW oriented contour Slic3r::Polygon hole_in_square{ { 160, 140 }, { 140, 140 }, { 140, 160 }, { 160, 160 } }; Slic3r::ExPolygon square_with_hole(square, hole_in_square); GIVEN("square_with_hole") { WHEN("offset") { Polygons result = Slic3r::offset(square_with_hole, 5.f); THEN("offset matches") { REQUIRE(result == Polygons { { { 205, 205 }, { 95, 205 }, { 95, 95 }, { 205, 95 }, }, { { 155, 145 }, { 145, 145 }, { 145, 155 }, { 155, 155 } } }); } } WHEN("offset_ex") { ExPolygons result = Slic3r::offset_ex(square_with_hole, 5.f); THEN("offset matches") { REQUIRE(result == ExPolygons { { { { 205, 205 }, { 95, 205 }, { 95, 95 }, { 205, 95 }, }, { { 145, 145 }, { 145, 155 }, { 155, 155 }, { 155, 145 } } } } ); } } WHEN("offset2_ex") { ExPolygons result = Slic3r::offset2_ex(square_with_hole, 5.f, -2.f); THEN("offset matches") { REQUIRE(result == ExPolygons { { { { 203, 203 }, { 97, 203 }, { 97, 97 }, { 203, 97 } }, { { 143, 143 }, { 143, 157 }, { 157, 157 }, { 157, 143 } } } } ); } } } GIVEN("square_with_hole 2") { Slic3r::ExPolygon square_with_hole( { { 20000000, 20000000 }, { 0, 20000000 }, { 0, 0 }, { 20000000, 0 } }, { { 5000000, 15000000 }, { 15000000, 15000000 }, { 15000000, 5000000 }, { 5000000, 5000000 } }); WHEN("offset2_ex") { Slic3r::ExPolygons result = Slic3r::offset2_ex(ExPolygons { square_with_hole }, -1.f, 1.f); THEN("offset matches") { REQUIRE(result.size() == 1); REQUIRE(square_with_hole.area() == result.front().area()); } } } GIVEN("square and hole") { WHEN("diff_ex") { ExPolygons result = Slic3r::diff_ex(Polygons{ square }, Polygons{ hole_in_square }); THEN("hole is created") { REQUIRE(result.size() == 1); REQUIRE(square_with_hole.area() == result.front().area()); } } } GIVEN("polyline") { Polyline polyline { { 50, 150 }, { 300, 150 } }; WHEN("intersection_pl") { Polylines result = Slic3r::intersection_pl({ polyline }, { square, hole_in_square }); THEN("correct number of result lines") { REQUIRE(result.size() == 2); } THEN("result lines have correct length") { // results are in no particular order REQUIRE(result[0].length() == 40); REQUIRE(result[1].length() == 40); } } WHEN("diff_pl") { Polylines result = Slic3r::diff_pl({ polyline }, Polygons{ square, hole_in_square }); THEN("correct number of result lines") { REQUIRE(result.size() == 3); } // results are in no particular order THEN("the left result line has correct length") { REQUIRE(std::count_if(result.begin(), result.end(), [](const Polyline &pl) { return pl.length() == 50; }) == 1); } THEN("the right result line has correct length") { REQUIRE(std::count_if(result.begin(), result.end(), [](const Polyline &pl) { return pl.length() == 100; }) == 1); } THEN("the central result line has correct length") { REQUIRE(std::count_if(result.begin(), result.end(), [](const Polyline &pl) { return pl.length() == 20; }) == 1); } } } GIVEN("Clipper bug #96 / Slic3r issue #2028") { Slic3r::Polyline subject{ { 44735000, 31936670 }, { 55270000, 31936670 }, { 55270000, 25270000 }, { 74730000, 25270000 }, { 74730000, 44730000 }, { 68063296, 44730000 }, { 68063296, 55270000 }, { 74730000, 55270000 }, { 74730000, 74730000 }, { 55270000, 74730000 }, { 55270000, 68063296 }, { 44730000, 68063296 }, { 44730000, 74730000 }, { 25270000, 74730000 }, { 25270000, 55270000 }, { 31936670, 55270000 }, { 31936670, 44730000 }, { 25270000, 44730000 }, { 25270000, 25270000 }, { 44730000, 25270000 }, { 44730000, 31936670 } }; Slic3r::Polygon clip { {75200000, 45200000}, {54800000, 45200000}, {54800000, 24800000}, {75200000, 24800000} }; Slic3r::Polylines result = Slic3r::intersection_pl({ subject }, { clip }); THEN("intersection_pl - result is not empty") { REQUIRE(result.size() == 1); } } GIVEN("Clipper bug #122") { Slic3r::Polyline subject { { 1975, 1975 }, { 25, 1975 }, { 25, 25 }, { 1975, 25 }, { 1975, 1975 } }; Slic3r::Polygons clip { { { 2025, 2025 }, { -25, 2025 } , { -25, -25 }, { 2025, -25 } }, { { 525, 525 }, { 525, 1475 }, { 1475, 1475 }, { 1475, 525 } } }; Slic3r::Polylines result = Slic3r::intersection_pl({ subject }, clip); THEN("intersection_pl - result is not empty") { REQUIRE(result.size() == 1); REQUIRE(result.front().points.size() == 5); } } GIVEN("Clipper bug #126") { Slic3r::Polyline subject { { 200000, 19799999 }, { 200000, 200000 }, { 24304692, 200000 }, { 15102879, 17506106 }, { 13883200, 19799999 }, { 200000, 19799999 } }; Slic3r::Polygon clip { { 15257205, 18493894 }, { 14350057, 20200000 }, { -200000, 20200000 }, { -200000, -200000 }, { 25196917, -200000 } }; Slic3r::Polylines result = Slic3r::intersection_pl({ subject }, { clip }); THEN("intersection_pl - result is not empty") { REQUIRE(result.size() == 1); } THEN("intersection_pl - result has same length as subject polyline") { REQUIRE(result.front().length() == Approx(subject.length())); } } #if 0 { # Clipper does not preserve polyline orientation my $polyline = Slic3r::Polyline->new([50, 150], [300, 150]); my $result = Slic3r::Geometry::Clipper::intersection_pl([$polyline], [$square]); is scalar(@$result), 1, 'intersection_pl - correct number of result lines'; is_deeply $result->[0]->pp, [[100, 150], [200, 150]], 'clipped line orientation is preserved'; } { # Clipper does not preserve polyline orientation my $polyline = Slic3r::Polyline->new([300, 150], [50, 150]); my $result = Slic3r::Geometry::Clipper::intersection_pl([$polyline], [$square]); is scalar(@$result), 1, 'intersection_pl - correct number of result lines'; is_deeply $result->[0]->pp, [[200, 150], [100, 150]], 'clipped line orientation is preserved'; } { # Disabled until Clipper bug #127 is fixed my $subject = [ Slic3r::Polyline->new([-90000000, -100000000], [-90000000, 100000000]), # vertical Slic3r::Polyline->new([-100000000, -10000000], [100000000, -10000000]), # horizontal Slic3r::Polyline->new([-100000000, 0], [100000000, 0]), # horizontal Slic3r::Polyline->new([-100000000, 10000000], [100000000, 10000000]), # horizontal ]; my $clip = Slic3r::Polygon->new(# a circular, convex, polygon [99452190, 10452846], [97814760, 20791169], [95105652, 30901699], [91354546, 40673664], [86602540, 50000000], [80901699, 58778525], [74314483, 66913061], [66913061, 74314483], [58778525, 80901699], [50000000, 86602540], [40673664, 91354546], [30901699, 95105652], [20791169, 97814760], [10452846, 99452190], [0, 100000000], [-10452846, 99452190], [-20791169, 97814760], [-30901699, 95105652], [-40673664, 91354546], [-50000000, 86602540], [-58778525, 80901699], [-66913061, 74314483], [-74314483, 66913061], [-80901699, 58778525], [-86602540, 50000000], [-91354546, 40673664], [-95105652, 30901699], [-97814760, 20791169], [-99452190, 10452846], [-100000000, 0], [-99452190, -10452846], [-97814760, -20791169], [-95105652, -30901699], [-91354546, -40673664], [-86602540, -50000000], [-80901699, -58778525], [-74314483, -66913061], [-66913061, -74314483], [-58778525, -80901699], [-50000000, -86602540], [-40673664, -91354546], [-30901699, -95105652], [-20791169, -97814760], [-10452846, -99452190], [0, -100000000], [10452846, -99452190], [20791169, -97814760], [30901699, -95105652], [40673664, -91354546], [50000000, -86602540], [58778525, -80901699], [66913061, -74314483], [74314483, -66913061], [80901699, -58778525], [86602540, -50000000], [91354546, -40673664], [95105652, -30901699], [97814760, -20791169], [99452190, -10452846], [100000000, 0] ); my $result = Slic3r::Geometry::Clipper::intersection_pl($subject, [$clip]); is scalar(@$result), scalar(@$subject), 'intersection_pl - expected number of polylines'; is sum(map scalar(@$_), @$result), scalar(@$subject) * 2, 'intersection_pl - expected number of points in polylines'; } #endif } SCENARIO("Various Clipper operations - t/clipper.t", "[ClipperUtils]") { GIVEN("square with hole") { // CCW oriented contour Slic3r::Polygon square { { 10, 10 }, { 20, 10 }, { 20, 20 }, { 10, 20 } }; Slic3r::Polygon square2 { { 5, 12 }, { 25, 12 }, { 25, 18 }, { 5, 18 } }; // CW oriented contour Slic3r::Polygon hole_in_square { { 14, 14 }, { 14, 16 }, { 16, 16 }, { 16, 14 } }; WHEN("intersection_ex with another square") { ExPolygons intersection = Slic3r::intersection_ex(Polygons{ square, hole_in_square }, Polygons{ square2 }); THEN("intersection area matches (hole is preserved)") { ExPolygon match({ { 20, 18 }, { 10, 18 }, { 10, 12 }, { 20, 12 } }, { { 14, 16 }, { 16, 16 }, { 16, 14 }, { 14, 14 } }); REQUIRE(intersection.size() == 1); REQUIRE(intersection.front().area() == Approx(match.area())); } } } GIVEN("square with hole 2") { // CCW oriented contour Slic3r::Polygon square { { 0, 0 }, { 40, 0 }, { 40, 40 }, { 0, 40 } }; Slic3r::Polygon square2 { { 10, 10 }, { 30, 10 }, { 30, 30 }, { 10, 30 } }; // CW oriented contour Slic3r::Polygon hole { { 15, 15 }, { 15, 25 }, { 25, 25 }, {25, 15 } }; WHEN("union_ex with another square") { ExPolygons union_ = Slic3r::union_ex({ square, square2, hole }); THEN("union of two ccw and one cw is a contour with no holes") { REQUIRE(union_.size() == 1); REQUIRE(union_.front() == ExPolygon { { 40, 40 }, { 0, 40 }, { 0, 0 }, { 40, 0 } } ); } } WHEN("diff_ex with another square") { ExPolygons diff = Slic3r::diff_ex(Polygons{ square, square2 }, Polygons{ hole }); THEN("difference of a cw from two ccw is a contour with one hole") { REQUIRE(diff.size() == 1); REQUIRE(diff.front().area() == Approx(ExPolygon({ {40, 40}, {0, 40}, {0, 0}, {40, 0} }, { {15, 25}, {25, 25}, {25, 15}, {15, 15} }).area())); } } } GIVEN("yet another square") { Slic3r::Polygon square { { 10, 10 }, { 20, 10 }, { 20, 20 }, { 10, 20 } }; Slic3r::Polyline square_pl = square.split_at_first_point(); WHEN("no-op diff_pl") { Slic3r::Polylines res = Slic3r::diff_pl({ square_pl }, Polygons{}); THEN("returns the right number of polylines") { REQUIRE(res.size() == 1); } THEN("returns the unmodified input polyline") { REQUIRE(res.front().points.size() == square_pl.points.size()); } } } } template double polytree_area(const Tree &tree, std::vector

*out) { traverse_pt(tree, out); return std::accumulate(out->begin(), out->end(), 0.0, [](double a, const P &p) { return a + p.area(); }); } size_t count_polys(const ExPolygons& expolys) { size_t c = 0; for (auto &ep : expolys) c += ep.holes.size() + 1; return c; } TEST_CASE("Traversing Clipper PolyTree", "[ClipperUtils]") { // Create a polygon representing unit box Polygon unitbox; const auto UNIT = coord_t(1. / SCALING_FACTOR); unitbox.points = { Vec2crd{0, 0}, Vec2crd{UNIT, 0}, Vec2crd{UNIT, UNIT}, Vec2crd{0, UNIT}}; Polygon box_frame = unitbox; box_frame.scale(20, 10); Polygon hole_left = unitbox; hole_left.scale(8); hole_left.translate(UNIT, UNIT); hole_left.reverse(); Polygon hole_right = hole_left; hole_right.translate(UNIT * 10, 0); Polygon inner_left = unitbox; inner_left.scale(4); inner_left.translate(UNIT * 3, UNIT * 3); Polygon inner_right = inner_left; inner_right.translate(UNIT * 10, 0); Polygons reference = union_({box_frame, hole_left, hole_right, inner_left, inner_right}); ClipperLib::PolyTree tree = union_pt(reference); double area_sum = box_frame.area() + hole_left.area() + hole_right.area() + inner_left.area() + inner_right.area(); REQUIRE(area_sum > 0); SECTION("Traverse into Polygons WITHOUT spatial ordering") { Polygons output; REQUIRE(area_sum == Approx(polytree_area(tree.GetFirst(), &output))); REQUIRE(output.size() == reference.size()); } SECTION("Traverse into ExPolygons WITHOUT spatial ordering") { ExPolygons output; REQUIRE(area_sum == Approx(polytree_area(tree.GetFirst(), &output))); REQUIRE(count_polys(output) == reference.size()); } SECTION("Traverse into Polygons WITH spatial ordering") { Polygons output; REQUIRE(area_sum == Approx(polytree_area(tree.GetFirst(), &output))); REQUIRE(output.size() == reference.size()); } SECTION("Traverse into ExPolygons WITH spatial ordering") { ExPolygons output; REQUIRE(area_sum == Approx(polytree_area(tree.GetFirst(), &output))); REQUIRE(count_polys(output) == reference.size()); } }