IGeometry.h

// -*- tab-width: 2; indent-tabs-mode: nil; coding: utf-8-with-signature -*-
//-----------------------------------------------------------------------------
// Copyright 2000-2026 CEA (www.cea.fr) IFPEN (www.ifpenergiesnouvelles.com)
// See the top-level COPYRIGHT file for details.
// SPDX-License-Identifier: Apache-2.0
//-----------------------------------------------------------------------------
#ifndef ARCGEOSIM_GEOMETRY_IGEOMETRY_H
#define ARCGEOSIM_GEOMETRY_IGEOMETRY_H
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#include "arcane/utils/Real3.h"
#include "arcane/core/Item.h"
#include "arcane/core/MathUtils.h"
 
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namespace Arcane::Numerics
{
using namespace Arcane;
 
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/*!
 * \brief Geometric calculation interface.
 */
class ARCANE_GEOMETRY_EXPORT IGeometry
{
 public:
 
  /** Class constructor */
  IGeometry()
  {
    ;
  }
 
  /** Class destructor */
  virtual ~IGeometry() {}
 
 public:
 
  //! Calculation of the center of mass
  virtual Real3 computeCenter(const ItemWithNodes& item) = 0;
 
  //! Calculation of the oriented measure
  /*! In the case of a planar element, this corresponds to
   *  the unit average normal * element measure
   *  and in the case of a simple volumetric element we obtain
   *  volume * z (or z=(0,0,1))
   */
  virtual Real3 computeOrientedMeasure(const ItemWithNodes& item) = 0;
 
  //! Calculation of the measure (without orientation)
  virtual Real computeMeasure(const ItemWithNodes& item) = 0;
 
  //! Calculation of the length
  /*! Only for linear Items */
  virtual Real computeLength(const ItemWithNodes& item) = 0;
 
  //! Calculation of the area
  /*! Only for surface Items */
  virtual Real computeArea(const ItemWithNodes& item) = 0;
 
  //! Calculation of the volume
  /*! Only for volumetric Items */
  virtual Real computeVolume(const ItemWithNodes& item) = 0;
 
  //! Calculation of the center
  /*! Only for surface Items */
  virtual Real3 computeSurfaceCenter(Integer n, const Real3* coords) = 0;
 
  //! Calculation of the oriented area (i.e., normal)
  /*! Only for surface Items */
  virtual Real3 computeOrientedArea(Integer n, const Real3* coords) = 0;
 
  //! Calculation of the length of a segment defined by two points
  virtual Real computeLength(const Real3& m, const Real3& n) = 0;
};
 
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} // namespace Arcane::Numerics
 
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#endif