MeshVizXLM/extractors/MxQuadrangleCellExtract.h

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/*=======================================================================
** Author      : VSG (MMM YYYY)
**=======================================================================*/
#ifndef  _MxQuadrangleCellExtract_h
#define  _MxQuadrangleCellExtract_h

#include <MeshVizXLM/mesh/geometry/MiGeometryI.h>

#include <Inventor/STL/vector>
#include <Inventor/STL/utility>

class MiSurfaceCell;

class MESHIVIZ_API MxQuadrangleCellExtract 
{
public:

  static MbVec3d getIsoParametricCoord(const MiGeometryI& meshGeometry, const MiSurfaceCell* quadrangleCell, const MbVec3d &point);
  
  static MbVec3d getIsoParametricCoord(size_t nodeIndex);

  static void getWeight(const MiGeometryI& meshGeometry, const MiSurfaceCell* quadrangleCell, const MbVec3d &point, std::vector<double>& weights)
  {
    getWeight(getIsoParametricCoord(meshGeometry,quadrangleCell,point),weights);
  }

  static void getWeight(const MbVec3d &ipcoord, std::vector<double>& weights)
  {
    double rm, sm;

    rm = 1. - ipcoord[0];
    sm = 1. - ipcoord[1];

    weights[0] = rm*sm;
    weights[1] = ipcoord[0]*sm;
    weights[2] = ipcoord[0]*ipcoord[1];
    weights[3] = rm*ipcoord[1];
  }

  static void getDerivs(const MbVec3d &ipcoord, std::vector<double>& derivs);

  static bool isPointInsideCell(const MiGeometryI& meshGeometry, const MiSurfaceCell* quadrangleCell, const MbVec3d &point, std::vector<double>& weights)
  {
    MbVec3d pcoord = getIsoParametricCoord(meshGeometry,quadrangleCell,point);
    bool inside = ( -1.E-5 < pcoord[0] &&  pcoord[0] < 1 + 1.E-5 &&
                    -1.E-5 < pcoord[1] &&  pcoord[1] < 1 + 1.E-5 );
    if (inside)
      getWeight(pcoord,weights);
    return inside;
  }

  static double getLongestEdgeLength(const MiGeometryI& meshGeometry, const MiSurfaceCell* cell);

  static double getShortestEdgeLength(const MiGeometryI& meshGeometry, const MiSurfaceCell* cell);

private:

  static bool initClass();
  static void exitClass();

  static bool   s_isInit;
  static double s_nodesIsoParametricCoords[4][3];
};

#endif 

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