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Fix polytree traversal.

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Put back old traverse_pt and union_pt_chained
This commit is contained in:
tamasmeszaros 2019-12-19 11:27:01 +01:00
parent 2feb8421e9
commit 42ffc4e3c5
4 changed files with 211 additions and 117 deletions
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76
tests/libslic3r/test_clipper_utils.cpp
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@ -1,5 +1,6 @@
#include <catch2/catch.hpp>
#include <numeric>
#include <iostream>
#include <boost/filesystem.hpp>
@ -223,3 +224,78 @@ SCENARIO("Various Clipper operations - t/clipper.t", "[ClipperUtils]") {
}
}
}
template<e_ordering o = e_ordering::OFF, class P, class Tree>
double polytree_area(const Tree &tree, std::vector<P> *out)
{
traverse_pt<o>(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 = {{0, 0}, {UNIT, 0}, {UNIT, UNIT}, {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<e_ordering::ON>(tree.GetFirst(), &output)));
REQUIRE(output.size() == reference.size());
}
SECTION("Traverse into ExPolygons WITH spatial ordering") {
ExPolygons output;
REQUIRE(area_sum == Approx(polytree_area<e_ordering::ON>(tree.GetFirst(), &output)));
REQUIRE(count_polys(output) == reference.size());
}
}