NormalAttrib.hh

/*===========================================================================*\
 *                                                                           *
 *                            OpenVolumeMesh                                 *
 *        Copyright (C) 2011 by Computer Graphics Group, RWTH Aachen         *
 *                        www.openvolumemesh.org                             *
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/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                         *
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 *   $LastChangedBy$                                                *
 *                                                                           *
\*===========================================================================*/

#ifndef NORMALATTRIB_HH_
#define NORMALATTRIB_HH_

#include <cassert>

#include "../Core/OpenVolumeMeshHandle.hh"
#include "OpenVolumeMeshStatus.hh"
#include "../Core/PropertyDefines.hh"

namespace OpenVolumeMesh {

template <class GeomKernelT>
class NormalAttrib {
public:

    NormalAttrib(GeomKernelT& _kernel);
    virtual ~NormalAttrib();

    void update_vertex_normals();

    void update_face_normals();

    const typename GeomKernelT::PointT& operator[](const VertexHandle& _h) const {
        assert((unsigned int)_h.idx() < kernel_.n_vertices());
        return v_normals_[_h.idx()];
    }

    const typename GeomKernelT::PointT& operator[](const FaceHandle& _h) const {
        assert((unsigned int)_h.idx() < kernel_.n_faces());
        return f_normals_[_h.idx()];
    }

    const typename GeomKernelT::PointT operator[](const HalfFaceHandle& _h) const {
        assert((unsigned int)_h.idx() < kernel_.n_halffaces());
        double mult = 1.0;
        if(_h.idx() % 2 == 1) mult = -1.0;
        return f_normals_[kernel_.face_handle(_h).idx()] * mult;
    }

    typename GeomKernelT::PointT& operator[](const VertexHandle& _h) {
        assert((unsigned int)_h.idx() < kernel_.n_vertices());
        return v_normals_[_h.idx()];
    }

    typename GeomKernelT::PointT& operator[](const FaceHandle& _h) {
        assert((unsigned int)_h.idx() < kernel_.n_faces());
        return f_normals_[_h.idx()];
    }

    typename GeomKernelT::PointT operator[](const HalfFaceHandle& _h) {
        assert((unsigned int)_h.idx() < kernel_.n_halffaces());
        double mult = 1.0;
        if(_h.idx() % 2 == 1) mult = -1.0;
        return f_normals_[kernel_.face_handle(_h).idx()] * mult;
    }

private:

    void compute_vertex_normal(const VertexHandle& _vh);

    void compute_face_normal(const FaceHandle& _fh);

    GeomKernelT& kernel_;

    VertexPropertyT<typename GeomKernelT::PointT> v_normals_;
    FacePropertyT<typename GeomKernelT::PointT> f_normals_;

};

} // Namespace OpenVolumeMesh

#if defined(INCLUDE_TEMPLATES) && !defined(NORMALATTRIBT_CC)
#include "NormalAttribT.cc"
#endif

#endif /* NORMALATTRIB_HH_ */