/*===========================================================================*\
 *                                                                           *
 *                               OpenMesh                                    *
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 *  This file is part of OpenMesh.                                           *
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\*===========================================================================*/

/*===========================================================================*\
 *                                                                           *
 *   $Revision$                                                         *
 *   $Date$                   *
 *                                                                           *
\*===========================================================================*/




//=============================================================================
//
//  CLASS NormalCone
//
//=============================================================================


#ifndef OPENMESH_NORMALCONE_HH
#define OPENMESH_NORMALCONE_HH


//== INCLUDES =================================================================


#include <OpenMesh/Core/Geometry/VectorT.hh>


//== NAMESPACES ===============================================================


namespace OpenMesh {


//== CLASS DEFINITION =========================================================


/** /class NormalCone NormalCone.hh <ACG/Geometry/Types/NormalCone.hh>

    NormalCone that can be merged with other normal cones. Provides
    the center normal and the opening angle.
**/

template <typename Scalar>
class NormalConeT
{
public:

  // typedefs
  typedef VectorT<Scalar, 3>  Vec3;


  //! default constructor (not initialized)
  NormalConeT() {}

  //! Initialize cone with center (unit vector) and angle (radius in radians)
  NormalConeT(const Vec3& _center_normal, Scalar _angle=0.0);

  //! return max. distance (radians) unit vector to cone (distant side)
  Scalar max_angle(const Vec3&) const;

  //! return max. distance (radians) cone to cone (distant sides)
  Scalar max_angle(const NormalConeT&) const;

  //! merge _cone; this instance will then enclose both former cones
  void merge(const NormalConeT&);

  //! returns center normal
  const Vec3& center_normal() const { return center_normal_; }

  //! returns size of cone (radius in radians)
  inline Scalar angle() const { return angle_; }

private:

  Vec3    center_normal_;
  Scalar  angle_;
};


//=============================================================================
} // namespace OpenMesh
//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_NORMALCONE_C)
#define OPENMESH_NORMALCONE_TEMPLATES
#include "NormalConeT.cc"
#endif
//=============================================================================
#endif // OPENMESH_NORMALCONE_HH defined
//=============================================================================