Method extract_result

tools/Boolean/Clipper/ClipperEngine.cpp:178–226

}

void ClipperEngine::extract_result(const ClipperLib::Paths& paths) {
    std::list<Vector2F> vertices;
    Loops loops;
    size_t num_segments = 0;
    for (const auto& path : paths) {
        Loop loop = path_to_loop(path, vertices);
        loops.push_back(loop);
        num_segments += loop.size();
    }

    const size_t num_loop_vertices = vertices.size();
    MatrixFr loop_vertices(num_loop_vertices, 2);
    size_t count = 0;
    for (const auto& v : vertices) {
        loop_vertices.row(count) = v;
        count++;
    }

    MatrixIr segments(num_segments, 2);
    count = 0;
    for (auto loop : loops) {
        const size_t loop_size = loop.size();
        size_t i=0;
        for (auto v_index : loop) {
            const size_t curr_segment = count + i;
            const size_t next_segment = count + (i+1)%loop_size;
            segments.coeffRef(curr_segment, 1) = v_index;
            segments.coeffRef(next_segment, 0) = v_index;
            i++;
        }
        count+=loop_size;
    }

    if (num_segments > 0) {
        // Known issue: duplicated vertices from different loops cause triangle to crash.
        ::remove_duplicated_vertices(loop_vertices, segments);
        TriangleWrapper tri_wrapper;
        tri_wrapper.set_points(loop_vertices);
        tri_wrapper.set_segments(segments);
        tri_wrapper.set_split_boundary(false);
        tri_wrapper.set_auto_hole_detection(true);
        tri_wrapper.set_max_num_steiner_points(0);
        tri_wrapper.set_verbosity(0);
        tri_wrapper.run();

        m_vertices = tri_wrapper.get_vertices();
        m_faces = tri_wrapper.get_faces();
    }
}

#endif