ClipperUtils.hpp

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#pragma once
 
#include <Eigen/Core>
#ifdef POLYFEM_WITH_CLIPPER
#include <clipper.hpp>
#endif
#include <polyclipper_vector2d.hh>
#include <polyclipper_vector3d.hh>
 
namespace polyfem::utils
{
    static constexpr int64_t DOUBLE_TO_INT_SCALE_FACTOR = 1l << 51;
 
    class PolygonClipping
    {
    public:
        PolygonClipping() = delete;
 
        static std::vector<Eigen::MatrixXd> clip(
            const Eigen::MatrixXd &subject_polygon,
            const Eigen::MatrixXd &clipping_polygon);
 
#ifdef POLYFEM_WITH_CLIPPER
        static ClipperLib::IntPoint toClipperPoint(const Eigen::RowVector2d &p);
        static Eigen::RowVector2d fromClipperPoint(const ClipperLib::IntPoint &p);
 
        static ClipperLib::Path toClipperPolygon(const Eigen::MatrixXd &V);
        static Eigen::MatrixXd fromClipperPolygon(const ClipperLib::Path &path);
#endif
 
        static PolyClipper::Vector2d toPolyClipperVector(const Eigen::Vector2d &v);
        static Eigen::Vector2d fromPolyClipperVector(const PolyClipper::Vector2d &v);
    };
 
    class TriangleClipping
    {
    public:
        TriangleClipping() = delete;
 
        static std::vector<Eigen::MatrixXd> clip(
            const Eigen::MatrixXd &subject_triangle,
            const Eigen::MatrixXd &clipping_triangle);
    };
 
    class TetrahedronClipping
    {
    public:
        TetrahedronClipping() = delete;
 
        typedef std::vector<int> Polygon;
        typedef std::vector<Polygon> Polygons;
 
        static std::vector<Eigen::MatrixXd> clip(
            const Eigen::MatrixXd &subject_tet,
            const Eigen::MatrixXd &clipping_tet);
 
        static PolyClipper::Vector3d toPolyClipperVector(const Eigen::Vector3d &v);
        static Eigen::Vector3d fromPolyClipperVector(const PolyClipper::Vector3d &v);
    };
 
} // namespace polyfem::utils