GeomElement.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
//-----------------------------------------------------------------------------
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/* GeomElement.h                                               (C) 2000-2026 */
/*                                                                           */
/* Geometric Elements.                                                       */
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#ifndef ARCANE_GEOMETRIC_GEOMELEMENT_H
#define ARCANE_GEOMETRIC_GEOMELEMENT_H
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#include "arcane/core/Item.h"
#include "arcane/core/VariableTypes.h"
 
#include "arcane/geometry/GeomElementView.h"
 
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namespace Arcane::geometric
{
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/*!
 * \ingroup ArcaneGeometric
 * \brief Base class for geometric elements.
 *
 * A geometric element contains the coordinates of the \a NbNode nodes that
 * compose this element.
 *
 * For performance reasons, the default constructor
 * does not initialize the coordinates.
 *
 * To retrieve the coordinates of the i-th node of the geometric element,
 * simply use the [] operator. Modification is done via
 * setItem().
 */
template <int NbNode>
class GeomElementBase
{
 public:
 
  //! Empty constructor.
  GeomElementBase() = default;
  //! Constructor from the coordinates \a coords of the nodes of the entity \a item
  GeomElementBase(const VariableNodeReal3& coords, ItemWithNodes item)
  {
    init(coords, item);
  }
  //! Constructor from the coordinates \a coords.
  constexpr GeomElementBase(ConstArrayView<Real3> coords)
  {
    for (Integer i = 0; i < NbNode; ++i)
      setItem(i, coords[i]);
  }
 
  //! Retrieves the value of the i-th node
  constexpr const Real3 s(Integer i) const { return Real3(m_s[i].x, m_s[i].y, m_s[i].z); }
  //! Retrieves the value of the i-th node
  constexpr const Real3 operator[](Integer i) const { return Real3(m_s[i].x, m_s[i].y, m_s[i].z); }
  //! Positions the value of the i-th node at \a v
  constexpr void setItem(Integer i, const Real3& v) { m_s[i] = v; }
  //! Positions the value of the i-th node at Real3(\a x,\a y,\a z)
  constexpr void setItem(Integer i, Real x, Real y, Real z) { m_s[i] = Real3(x, y, z); }
 
  /*!
   * \brief Fills the view \a view with the coordinates of the instance.
   */
  constexpr void fillView(ArrayView<Real3> view) const
  {
    for (Integer i = 0; i < NbNode; ++i)
      view[i] = s(i);
  }
 
  /*!
   * \brief Initializes the coordinates with those of the nodes of the entity \a item
   */
  void init(const VariableNodeReal3& coords, ItemWithNodes item)
  {
    for (Integer i = 0; i < NbNode; ++i)
      m_s[i] = coords[item.node(i)];
  }
 
 protected:
 
  Real3POD m_s[NbNode];
};
 
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#include "arcane/geometry/GeneratedGeomElement.h"
 
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} // namespace Arcane::geometric
 
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#endif