/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/MagneticField/Interpolation/src/RectangularCartesianMFGrid.cc

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#include "RectangularCartesianMFGrid.h"
#include "binary_ifstream.h"
#include "LinearGridInterpolator3D.h"

#include <iostream>

using namespace std;

RectangularCartesianMFGrid::RectangularCartesianMFGrid( binary_ifstream& inFile,
                                                        const GloballyPositioned<float>& vol)
  : MFGrid3D(vol)
{

  // The parameters read from the data files are given in global coordinates.
  // In version 85l, local frame has the same orientation of global frame for the reference
  // volume, i.e. the r.f. transformation is only a translation.
  // There is therefore no need to convert the field values to local coordinates.
  // Check this assumption: 
  GlobalVector localXDir(frame().toGlobal(LocalVector(1,0,0)));
  GlobalVector localYDir(frame().toGlobal(LocalVector(0,1,0)));

  if (localXDir.dot(GlobalVector(1,0,0)) > 0.999999 &&
      localYDir.dot(GlobalVector(0,1,0)) > 0.999999) {
    // "null" rotation - requires no conversion...
  } else {
    cout << "ERROR: RectangularCartesianMFGrid: unexpected orientation: x: " 
         << localXDir << " y: " << localYDir << endl;
  }

  int n1, n2, n3;
  inFile >> n1 >> n2 >> n3;
  double xref, yref, zref;
  inFile >> xref >> yref >> zref;
  double stepx, stepy, stepz;
  inFile >> stepx    >> stepy    >> stepz;

  vector<BVector> fieldValues;
  float Bx, By, Bz;
  int nLines = n1*n2*n3;
  fieldValues.reserve(nLines);
  for (int iLine=0; iLine<nLines; ++iLine){
    inFile >> Bx >> By >> Bz;
    fieldValues.push_back(BVector(Bx,By,Bz));
  }
  // check completeness
  string lastEntry;
  inFile >> lastEntry;
  if (lastEntry != "complete"){
    cout << "ERROR during file reading: file is not complete" << endl;
  }

  GlobalPoint grefp( xref, yref, zref);
  LocalPoint lrefp = frame().toLocal( grefp);

  Grid1D gridX( lrefp.x(), lrefp.x() + stepx*(n1-1), n1);
  Grid1D gridY( lrefp.y(), lrefp.y() + stepy*(n2-1), n2);
  Grid1D gridZ( lrefp.z(), lrefp.z() + stepz*(n3-1), n3);
  grid_ = GridType( gridX, gridY, gridZ, fieldValues);
  
  // Activate/deactivate timers
//   static SimpleConfigurable<bool> timerOn(false,"MFGrid:timing");
//   (*TimingReport::current()).switchOn("MagneticFieldProvider::valueInTesla(RectangularCartesianMFGrid)",timerOn);

}

void RectangularCartesianMFGrid::dump() const
{
  cout << endl << "Dump of RectangularCartesianMFGrid" << endl;
//   cout << "Number of points from file   " 
//        << n1 << " " << n2 << " " << n3 << endl;
  cout << "Number of points from Grid1D " 
       << grid_.grida().nodes() << " " << grid_.gridb().nodes() << " " << grid_.gridc().nodes() << endl;

//   cout << "Reference Point from file   " 
//        << xref << " " << yref << " " << zref << endl;
  cout << "Reference Point from Grid1D " 
       << grid_.grida().lower() << " " << grid_.gridb().lower() << " " << grid_.gridc().lower() << endl;

//   cout << "Basic Distance from file   " 
//        <<  stepx << " " << stepy << " " << stepz << endl;
  cout << "Basic Distance from Grid1D "
       << grid_.grida().step() << " " << grid_.gridb().step() << " " << grid_.gridc().step() << endl;


  cout << "Dumping " << grid_.data().size() << " field values " << endl;
  // grid_.dump();
}

MFGrid::LocalVector 
RectangularCartesianMFGrid::uncheckedValueInTesla( const LocalPoint& p) const
{
//   static TimingReport::Item & timer= (*TimingReport::current())["MagneticFieldProvider::valueInTesla(RectangularCartesianMFGrid)"];
//   TimeMe t(timer,false);

  LinearGridInterpolator3D interpol( grid_);
  GridType::ReturnType value = interpol.interpolate( p.x(), p.y(), p.z());
  return LocalVector(value);
}

void RectangularCartesianMFGrid::toGridFrame( const LocalPoint& p, 
                                              double& a, double& b, double& c) const
{
  a = p.x();
  b = p.y();
  c = p.z();
}
 
MFGrid::LocalPoint RectangularCartesianMFGrid::fromGridFrame( double a, double b, double c) const
{
  return LocalPoint( a, b, c);
}