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C:/temp/src/j2k/Beta/3D/Interpol.cpp

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#ifndef __J2K__Interpol_CPP__
#define __J2K__Interpol_CPP__

#include <j2k/Fred/3d/interpol.hpp>

double Z_InterpolationBilineaire( ZMaille* zm, Point2d* pt ) {
  double  u, v, temp;

  u = zm->Z00 + ( zm->Z10 - zm->Z00 ) * pt->X;
  v = zm->Z01 + ( zm->Z11 - zm->Z01 ) * pt->X;

  temp = u + ( v - u ) * pt->Y;  

  return temp;
}

Point2d  Grad_InterpolationBilineaire( ZMaille* zm, Point2d* pt ) {
  double    temp;
  Point2d   pente; 

  temp    = zm->Z00 + zm->Z11 - zm->Z10 - zm->Z01;
  pente.X = zm->Z10 - zm->Z00 + temp * pt->Y;
  pente.Y = zm->Z01 - zm->Z00 + temp * pt->X;

  return pente; 
}

#endif

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