surface_mesh_topology.h

/********************************************************************
 * Copyright (C) 2015-2021 by Liangliang Nan <liangliang.nan@gmail.com>
 * Copyright (C) 2000-2005 INRIA - Project ALICE
 *
 * The code in this file is partly from OGF/Graphite (2.0 alpha-4) with
 * modifications and enhancement:
 *      https://gforge.inria.fr/forum/forum.php?forum_id=11459
 * The original code was distributed under the GNU GPL license.
 ********************************************************************/
 
#ifndef EASY3D_ALGO_SURFACE_MESH_TOPOLOGY_H
#define EASY3D_ALGO_SURFACE_MESH_TOPOLOGY_H
 
 
#include <cstddef>
 
namespace easy3d {
 
    class SurfaceMeshComponent;

    class SurfaceMeshTopology {
    public:
        explicit SurfaceMeshTopology(const SurfaceMeshComponent *comp);

        int euler_poincare() const;

        std::size_t number_of_borders() const { return number_of_borders_; }

        std::size_t largest_border_size() const { return largest_border_size_; }

        bool is_closed() const { return number_of_borders_ == 0; }

        bool is_sphere() const { return (number_of_borders() == 0) && (euler_poincare() == 2); }

        bool is_disc() const { return (number_of_borders() == 1) && (euler_poincare() == 1); }

        bool is_cylinder() const { return (number_of_borders() == 2) && (euler_poincare() == 0); }

        bool is_torus() const { return (number_of_borders() == 0) && (euler_poincare() == 0); }
 
    private:
        const SurfaceMeshComponent *component_;
 
        std::size_t number_of_borders_;
        std::size_t largest_border_size_;
    };
 
}
 
#endif  // EASY3D_ALGO_SURFACE_MESH_TOPOLOGY_H