quadratureRules.h

// Gmsh - Copyright (C) 1997-2018 C. Geuzaine, J.-F. Remacle
//
// See the LICENSE.txt file for license information. Please report all
// bugs and problems to the public mailing list <gmsh@onelab.info>.
//
// Contributor(s):
//   Eric Bechet
//

#ifndef _QUADRATURERULES_H_
#define _QUADRATURERULES_H_

#include "GaussIntegration.h"
#include "MElement.h"

class QuadratureBase
{
  public :
  virtual ~QuadratureBase(){}
  virtual int getIntPoints(MElement *e, IntPt **GP) =0;
};

// For rigid contact no need of Gauss'integration
// but to use clasical get function in term npts and IntPt are needed
// so use a empty gaussQuadrature rule
class QuadratureVoid : public QuadratureBase
{
 public:
  QuadratureVoid() : QuadratureBase(){}
  ~QuadratureVoid(){}
  int getIntPoints(MElement *e, IntPt **GP){GP=NULL; return 0;}
} ;

class GaussQuadrature : public QuadratureBase
{
 public :
  enum IntegCases {Other, Val, Grad, ValVal, GradGrad};
 private :
  int order;
  IntegCases info;
 public :
  GaussQuadrature(int order_ = 0) : order(order_), info(Other) {}
  GaussQuadrature(IntegCases info_) : order(0), info(info_) {}
  virtual ~GaussQuadrature(){}
  virtual int getIntPoints(MElement *e, IntPt **GP)
  {
    int integrationOrder;
    int npts;
    int geoorder = e->getPolynomialOrder();
    switch(info)
    {
    case Other :
      integrationOrder = order;
      break;
    case Val :
      integrationOrder = geoorder + 1;
      break;
    case Grad :
      integrationOrder = geoorder;
      break;
    case ValVal :
      integrationOrder = 2 * geoorder;
      break;
    case GradGrad :
      integrationOrder = 3 * (geoorder - 1) + 1;
      break;
    default : integrationOrder = 1;
    }
    e->getIntegrationPoints(integrationOrder, &npts, GP);
    return npts;
  }
  // copy constructor
  GaussQuadrature(const GaussQuadrature &other) : order(other.order), info(other.info){}
};

#endif //_QUADRATURERULES_H_