surface_mesh_components.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_COMPONENTS_H
#define EASY3D_ALGO_SURFACE_MESH_COMPONENTS_H
 
#include <vector>
 
#include <easy3d/core/surface_mesh.h>
 
 
namespace easy3d {

    class SurfaceMeshComponent {
    public:
        // convenient type definitions
        typedef SurfaceMesh::Face       Face;       
        typedef SurfaceMesh::Vertex     Vertex;     
        typedef SurfaceMesh::Edge       Edge;       
        typedef SurfaceMesh::Halfedge   Halfedge;   
 
    public:
        explicit SurfaceMeshComponent(SurfaceMesh *mesh) : mesh_(mesh) {}

        static std::vector<SurfaceMeshComponent> extract(SurfaceMesh *mesh, bool descending = true);

        static SurfaceMeshComponent extract(SurfaceMesh *mesh, SurfaceMesh::Face seed);

        static SurfaceMeshComponent extract(SurfaceMesh *mesh, SurfaceMesh::Vertex seed);

        const std::vector<Face> &faces() const { return faces_; }

        const std::vector<Vertex> &vertices() const { return vertices_; }

        const std::vector<Edge> &edges() const { return edges_; }

        const std::vector<Halfedge> &halfedges() const { return halfedges_; }

        std::size_t n_faces() const { return faces_.size(); }

        std::size_t n_vertices() const { return vertices_.size(); }

        std::size_t n_edges() const { return edges_.size(); }

        std::size_t n_halfedges() const { return halfedges_.size(); }

        SurfaceMesh *mesh() const { return mesh_; }

        float area() const;

        float border_length() const;

        Box3 bbox() const;

        void translate(const vec3 &offset);

        SurfaceMesh *to_mesh() const;
 
    private:
        SurfaceMesh *mesh_;
        std::vector<Face> faces_;
        std::vector<Vertex> vertices_;
        std::vector<Halfedge> halfedges_;
        std::vector<Edge> edges_;
    };
 
}
 
#endif  // EASY3D_ALGO_SURFACE_MESH_COMPONENTS_H